close

Вход

Забыли?

вход по аккаунту

JPS62199198

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS62199198
[0001]
(Industrial field of application) Kikyo Akira is used by the listener in the playback sound field or
at a position close to the listener's expected position, so that the playback sound is similar to the
J'l K sound field Direction, ie horizontal: 360 ° # obtained by being able to control the
localization, height, distance, presence, and the ratio of the sound pressure m that can be
received by the auditory organ and the amount of sound pressure that can be received by the
body The sound pressure amount and the sound pressure distance feeling can be reproduced.
Especially when used in the reproduction sound field using a pinaural program source, the
reproduction that is indistinguishable from the real sound is noted by the listener's ear function
The present invention relates to a muffler for reproduction sound field which can be obtained
without. (Prior Art) There is a prior art of (1) to (2) shown below. {Circle over (3)} JP-B-3,1841,
which tries to obtain only localization information contained in a stereo signal source to a
listener. ■ Japanese Patent Application Laid-Open No. 58-107794, which attempts to apply
mechanical vibration to in-vivo tissues of the face and head. ■ Realism fL ■ present device
which tries to make the body of the listener feel the amount of sound pressure simulated by
material conduction vibration by making the object which touches the body such as a chair 18 by
the reproduction signal and make it simulate experience. . ■ Sound insulation board type
speaker, pinaural. This is a method well known as the elimination of crosstalk between left and
right signals that occurs exclusively during normal stereo playback except near-speaker playback
and head-on playback, so that the left and right speakers do not mix up to the listener An attempt
was made to set up a shield on the median plane and divide the reproduction space into two.
(Problems to be Solved by the Invention) The above-described conventional techniques have the
following disadvantages (a) to (f). (Because) The balance between the sound pressure received by
the auditory organ and the sound pressure received by the body, and the balance between the
sound pressure are determined by the distance between the speaker and the listener. There is a
10-05-2019
1
fixed problem, so the sound pressure balance as obtained at the distance between the listener
and the stage at the time of ordinary music appreciation can not be obtained, and the reproduced
sound makes the speaker aware. In addition, a gap between the information recognized by the
body and the information recognized by the ear is generated, and this gap shifts up the
localization of the reproduced sound as a whole, and it feels like the unnaturally floating 1α. It
was done. In addition, he was made to be awkward to have a calm sound image expression that
came to the ground. (B) Independent problems of the left channel and the right channel, that is,
the problem of the presence of head reflection information capable of recognizing the speaker
position.
H, due to the existence, in reproduction other than the real image same as the speaker position,
deviation from the timbre pattern recognition at an arbitrary sound source position learned by
the ear will occur, and reverberation sound etc. having no directivity in particular 1 Note that it is
an artificial reproduced sound that causes the speaker to be recognized, and sometimes the peak
due to the head 0411 is too sharp, which may lead to a situation where it can not stand listening.
It also killed the localization information of the pinaural signal. Also, as a method for removing
the recognition of the speaker position due to the one-ear effect, Japanese Patent Publication No.
53-21841 was obtained by mixing the above-mentioned cancellation information of the change
with the aπ1 change in the transfer characteristic change due to head reflection. Although it has
been proposed, there has been a major problem that the effect can not be obtained unless the
head opening angle is limited to the shape of the face from the shape of the face to the fine
characteristics of the speaker. (C) The greater the number of speakers, the longer the distance of
sound pressure can be reproduced, but the more speakers are added, the greater the mutual
interference between the speakers, the more distortion occurs. . Moreover, since the above
distortion erases the localization information of the pinaural, the IQ has been deteriorated. In
addition, there is a method to give a direct motive to the skin, although there is a JapaneseSpeaker Sho 58-107 794 and a Sho Akira 52-103 909 which tried to get a sense of a pressure
even with headphones listening and a speaker at a relatively short distance. Basically, I was
uncomfortable with the amount of sound pressure. (D) The possible conditions of the median
surface and positive back fixed 1α in pinaural reproduction are simulated human head used at
the time of program source creation, and If! ! It was necessary to meet the advanced similarity
condition of the head of the deaf. Also, the above-% case means that the average 111 suspects
can not be used, which has been a major obstacle for program source production. (E) A major
obstacle to creating a well-oriented program source is the variation in representation due to the
form of reproduction. That is, specifically, the type of the reproduction mode is about the
environment surrounding the speakers, the angle between the speakers, and the distance
between the listener and the speaker (very close to a headphone). Next, the dispersion of
expression accompanying this is the phenomenon of the phenomenon that the localization is
pulled to the speaker position, the dispersion of the speaker position, the compatibility between
the left and the right that are greatly dispersed due to the distant reverberation, and the like. The
10-05-2019
2
above-mentioned various kinds of rose are good if the amount is small, but there is a problem
that can not be solved because there is nothing superior.
<R> The present speaker 1 Yayoi system, which has a very large degree of dependence on the
binaural effect (Heath effect, right and left sound pressure balance), can be perceived only by the
one ear effect (a constant 1a effect by the head recoil q4 sound) For listeners, natural sound
vomiting often failed to recognize localization movements that could be sufficiently recognized.
(Means for Solving the Problems) In order to achieve the above object, according to the present
invention, an area adjacent to the assumed listening position at a position sandwiched between
the expected listening position and the sound producing body is used as a propagation area. In
the above, the area in the vicinity of the head in the propagation area is a head propagation area,
and the above propagation area excluding the head propagation area is a body propagation area,
and the function of supporting the head propagation area is possible. The body silencer has a
head silencer, and the body silencer has the function of supporting the body in the body
propagation area as described above! The above-mentioned head muffling device and the abovementioned body muffling so that the ratio of the sound pressure amount that can be received by
the listener's auditory organ and the sound pressure amount that can be received by the aIlI
person's body changes. The amount of sound pressure that can be received by the auditory organ
and the body by making the amount of the device different, or completely only one, or at least
one of the muting devices of the muffling device variable. A noise suppressor for reproduced
sound field obtained by making it possible to change the ratio of the amount of sound pressure
which can not be received quantitatively or arbitrarily. Alternatively, an area between the
listener's head assumed position and a position between the sound producing body and an area
close to the listener's head assumed position is a head reflection area, and the above-mentioned
function to support the head warp 4 area The above-mentioned, head reflection area is normal
free sky 1f by the silencer which has it! For propagation characteristics of 1, increase the
propagation loss 1, I: Note, due to the propagation loss, after the sound emitted from the
sounding body hits the listener's head II! Muffler V for reproduced sound field, which is obtained
by making it difficult to reach the listener's auditory organ with sounds generated exclusively by
the head scheduled to reach the auditory organ of the person who is increasing! & 鴇 provided.
An embodiment of the present invention will be described below with reference to the attached
drawings. 11J shows an embodiment of the present invention, in which the listener 88 receives
the sound from the speaker 87, and the sound can be directly entered into the ear canal or
reflected by the direct sound 82 and the face or pinna Sound pressure to enter the ear canal
other than the sound pressure 89 received by the body, consisting of the reflected sound 83
entering the ear canal, the reflected sound 81 reflecting mainly on the head surface and entering
the ear canal, and the sound pressure 89 received by the body Is configured to be able to be
reduced by the sound absorbing materials 84, 85, 86.
10-05-2019
3
The sound absorbing materials 84, 85, 86 reduce the sound pressure in the ear canal, and the
sound pressure received by the body is relatively large. In addition, if desired, a separate
instrument having a sound absorbing effect that makes it possible to surround the body can be
prepared separately, and thereby the sound pressure 89 received by the body can be controlled
to be reduced, and the volume received by the listener's hearing can be adjusted. It is also
possible to engrave the volume received and make it relatively large. In addition, it is also
recognized that the sound absorbing material 84 can reduce the high-pitched sound that the
sound striking the head surface propagates through the in-vivo tissue of the listener's face and
head and reaches the auditory organ. First, if the original sound is a diffuse sound field with a
relatively long distance and a reverberation resembling the relationship between a concert hall or
a stage and a audience, listening to the reality is as shown in Fig. 2. The body receives sound
pressure while the ear canal passes through a part of the sound pressure. The sound entering the
ear canal is well received to receive energy from all directions so that the body receives sound
pressure. There is no reason, and one-way sound of sound pressure from all directions mainly
enters the ear canal, mainly due to the shielding effect of the head and pinna. The relative
balance between the sense of sound pressure received by the body and the sense of sound
pressure received by the ear (hereinafter referred to as the sense of sound pressure balance) is a
quantitative graph that shows what kind of tendency is shown for each frequency in the diffuse
sound field. It is a tendency figure of FIG. In addition, when the wavelength is long in any free
sound field or diffuse sound field, for example, in 50 Hz or less, sound pressure feeling received
by the body and sound pressure feeling entering the ear canal are a degree of sound field
diffusion There is little influence on the presence or absence of evening number 1, and it
becomes a substantially fixed relationship. Therefore, FIG. 3 is created as a value of the same
level as the measurement value of the sound pressure sensation in B in the measurement value of
the sound pressure sensation received on the body in this frequency band or in the ear canal.
Also, since this figure assumes an ideal diffuse sound field, the sense of sound pressure received
by the body is substantially constant regardless of the wavelength of the sound. The sound
pressure sensation lO1 received by the body is slightly larger than the sound pressure sensation
102 received by the ear outside the area of the hatched portion 103, which is the balance of
sound pressure sensation in the ideal diffuse sound field. Also, it seems natural to think that the
condition without the hatched part 103 is one standard, so if you dare think about that condition,
it can be said that it occurs at a moderate diffuse sound field, but probably the sound received by
the ear The slight shaded area 1030 above is ideal because the sense of pressure and the sense
of sound pressure received by the body will be stronger in the order of relative amount than
absolute amount and relative amount variation than that. It is considered better to think of it as a
mere reference on a typical diffuse sound source.
Now, the relationship of a typical monaural reproduced sound with respect to Fig. 3 is as shown
in Fig. 4, and the condition of this lsf combined curve is about 2 ru from the distance of the
listener, and the distortion increase I hate to assume that the room is dead. 4 is very different
10-05-2019
4
from the relationship of FIG. 3, and the relative relationship between the sound pressure
sensation received by the body and the sound pressure noise received by the ear regardless of
the correction of the program source, graphic equalizer, etc. is 4 L! The tendency is as in l, that is,
the sound pressure feeling received by the ear is larger than the area of the hatched portion 113
with respect to the sound pressure feeling received by the body. Moreover, this relationship is
generated not only in the speaker reproduction but also when listening to the sound of the sound
source located at the same distance. That is, the gap between an ideal diffuse sound and a
general monaural reproduction sound has less sense of sound pressure on the body as much as
the area of the hatched portion 103 and the area of the hatched portion +13, and this gap is
relatively It is necessary to reduce this, which is like the sound-absorbing material 85 in FIG. 1
and makes it possible to find a solution that reduces the direct sound entering the ear canal and
is effective. The above is for the case of one speaker, and in the case of stereophonic-phonic
reproduction using two speakers set to a normal opening angle of 60 degrees, the above
tendency becomes more remarkable. Fig. 5 is a circle graph that illustrates pink pressure around
the listener 1201 and the speaker 1202 producing noise in all directions, and at that time the
generated pressure on the listener's ears and left ear is there. Also, at this time the sense of
sound pressure received by the listener's body is constant no matter what angle the speaker is, so
the high and low of the sensitivity drawn in this circle graph is the sense of the sound pressure
received by the body and the sense of sound pressure received by the ear. It also represents the
relative relationship. Line 1203 represents sound pressure measured in the ear canal population
in the right ear, and line 1204 represents sound pressure measured in the ear canal population
in the left ear. As a perspective of this pie chart, the width in the radial direction of the boundary
circle 1205 and the above line indicates the measured value, and for example, the measurement
result of six ears when the speaker 1202 is located at 15 degrees ahead of the left is The
measurement value of the left ear side has a line 1203 determined by the width 1206, and the
measurement value of the left ear side has a line 1204 determined by the width 1207.
Hereinafter, in the same manner, the measurement results in all directions are represented by the
relationship of the width in the radial direction between the boundary circle 1205 and the abovementioned line. Reference lines 1208 and 1209 represent measured values of sound pressure in
front of the left and right, respectively, and it is considered so as to show at a glance how the
measurement result is relative to the sound pressure in front.
The graph shown below the pie chart is a diagram in which the pie chart is cut to make it easier
to read by asking a straight line from dark & 11210. As a point of view, for example, the
measurement result of the six ears when the speaker 1202 is positioned at the front left 15
degrees, the sound pressure measurement value on the right ear side is represented by the width
1211 and therefore the right ear in any direction The sound pressure measurement results will
be represented by line 1214. And the measurement value of the left ear side is added to the
width 1211 of the measurement value on the right ear side by II @ 1212 so that the line 1213
has any width on the left side depending on the width of the line 1214 in the longitudinal
10-05-2019
5
direction It represents the sound pressure measurement results in the direction of, and at the
same time, it is possible to read the total sound pressure received to both ears in the case of one
sound generator or in a single direction. By the way, the view of the graph is as described above,
so why will the imbalance in the sound pressure sense balance mentioned above be worse when
listening to the stereo, will be explained below. First, as a condition, the localization to be
reproduced is narrowed down to the case of the front and compared in the case of one sound
generator or in the case of single direction or in the case of stereo listening. This is only on the
front side because there is a possibility that the procedure can not be obtained if the issue of the
combination of the left and right volumes is taken into consideration on the stereo listening side.
Now, since stereo listening is generally performed with a speaker flash angle of 60 degrees, the
sound pressure of the sound is represented by the width 1215 on the right ear side and the
width 1216 on the left ear side. There is. That is, the total sound pressure of @ 1215 and width
1216 is the sound pressure given to both ears, and this becomes the sound pressure window to
the ear at the time of stereo listening. On the other hand, in the case of one sound source or
single direction, the sound pressure on the right ear side is represented by the width 1217 and
the sound pressure on the left ear side is represented by the width 1218 in the frontal
localization. ing. And, the total back pressure of @ 1217 and the radius 1218 is the sound
pressure given to both ears, and this becomes the sound pressure window to the ear at the time
of monaural. When comparing the sound pressure window to the ear in each system at the time
of front localization determined as described above, it is clear that the sound to the ear is better
than the case of the step 11111 in the case of listening to the sound in a single direction. The
pressure window is large. This is because, in the case of stereo listening, the sound comes in from
both of the ears at a sensitive angle. In addition, even if it becomes possible to localize the rear
sound when it is possible to localize the sound in two channels in the 2 channels, the sound
pressure sense balance is the sound pressure window heard by the monophonic sound source
from a single direction in the rear sound. It is clear from the graph that the difference in sound
pressure window becomes larger compared to stereo listening.
Similar to the above-mentioned rear sound, the degree of the sound pressure window in various
directions can be known by the line 1213, and it becomes clear from this that although it is only
for the non-diffuse sound source, for example, listening to the front sound The sound pressure
balance can be understood as a tendency toward the sound pressure received by the body, etc. if
it can be compared with the sound from the direction of 45 degrees when you are living, if the
tendency of this sound pressure window can be faithfully reproduced It is also understood that
the reproduction of localization in various directions is closer to the real thing. Furthermore, it
becomes clear from the line 12I3 that the listener has a speaker opening angle that gives the
user a sense of ordinary feeling, regardless of the direction in which the listener listens to the
sound of the two speakers for stereo listening. The sound pressure window received by the
stereo listening has a clearly higher value than in any state when the speaker is one. As described
above, even if the imbalance between the sound pressure window in the ear and the sound
10-05-2019
6
pressure window received by the body described in FIGS. 2 to 4 is completely balanced, the ann
described in FIG. 5 as stereo listening is further described. The problem of balance can be found
to occur, especially for back sound program sources, this gap is strong, and the most striking
example of this is when trying to play back sound in a diffuse state. It turns out that it is difficult
to reproduce this sound source in a satisfactory manner, no matter which of the conventional
reproduction means is in fact. Now, in order to make the above reproduction closer to the real
sound field, it is necessary to further increase the thickness of the sound absorbing material 85
in FIG. 1, and in some cases, it may be changed to another material having high sound insulation.
It can be said that the reason for the imbalance described in FIG. 5 is that the influence of the
head reflection sound including the auricle is largely involved, and it can be said that the sound
pressure sensation of only the ear has been greatly increased. This is shown in Figure 6. The
positional relationship between the speaker and the head is usually that the listener listens
without moving his head so much that the large peak 131 due to head reflection is always
moving unless he moves his head. Since all of the sound pressure appearing on the same
frequency and being reproduced is concentrated on the fixed two-direction sound source, this
peak is extremely strong, and the sound pressure sensation to the ear alone is raised strangely.
The imbalance due to the above peak can balance the sound pressure feeling received to J1 and
the sound pressure feeling received to the body by the peak sound prevention and absorption by
the sound absorbing material 86 and the sound absorbing material 84 in FIG. Conventionally,
Japanese Patent Publication No. 53-211 (No. 41) has been known as a method for removing the
peak by mixing the peak canceling sound into the signal of the sounding body (in this method,
the peak pressure decreases and the sound pressure on the body decreases. Since the peak is
lowered, the peak can be removed but the sound pressure can not be balanced, and it is
considered that the above method does not generate a peak canceling effect except in an ideal
experimental atmosphere.
In addition, the conventional technology which provides listeners with direct vibration using an
object as a medium without using air as a medium for sound pressure sensation to the body, and
a speaker for sound pressure service to the body during head-on reproduction are added.
Although the method etc. can be easily considered, the method of giving vibration directly to the
former body is a stimulus that is originally different from the sound pressure sensation of the
original sound field, so the present invention seeks reproduction that is hard to distinguish from
the original sound field. Is useless, and in the latter case, there is always a modulated sound due
to the time lag between the headphone and the speaker sound pressure, and if you move your
head even if you use the delay, its delay time will be slightly shifted and complex chorus
Producing sound), and therefore, unless the above extremely fine and subtle delay time is
completely controlled, reproduction becomes a lot of artificial feeling. In the embodiment shown
in FIG. 7, the sound absorbing material 144 wraps around the entire head excluding the ear canal
of the listener 141. The hatched portion 145 indicates a range in which the sound produced by
the head, which is scheduled to reach the listener's auditory organ after the sound emitted from
10-05-2019
7
the speaker 142 hits the head of the listening 11410, is located in the reproduction sound field.
By setting the 1 = sowing characteristic in this range to a lossy state using the sound absorbing
material 144 or the like, it is possible to reduce or eliminate the sound to be delivered to the
auditory organ. Further, it can be said that the hatched portion 5 indicates a useful portion in the
sound absorbing material 144, and therefore, the hatched portion 145 naturally changes with
the change of the relative position of the listener and the speaker. The problem that does not
depend on the type of program source is that the sound pressure always decreases as the
distortion of the speaker is reduced, and as a matter of fact, the direction in which the listener's
ear goes into as much as possible is endlessly single. In the direction, the peak components
generated by the various reflections generated at the listener's head are also limited to one
pattern and become dark and difficult. In addition, when the distortion factor of the speaker is
neglected, it can be configured to enter the listener's ear from various directions due to the
speaker's baffle reflection, box sounding, room reverberation etc. Therefore, the resulting peak
component also loses sharpness, that is, an audible sound. In other words, this condition is
considered to be the central sound assumption currently performed in commercial audio, but
naturally it causes unspecified distortion and loses the meaning of the low distortion of the audio.
The degree of reproducibility is low, which is a dimension far from the area where the playback
sound is not conscious.
There are roughly two ways to solve the above contradictory problems. One is to use a large
number of ideal speakers and use a method to reproduce the phases perfectly in the ear canals of
these listeners. At first it is considered as the first (it is a reproduction method generally called
physical sound field), but there is an intermittent point close to impossible such as position
change of the listener and phasing to both ears, so this method should be taken Another
approach that can not do this is an embodiment of the present invention which will now be
described. First, let us summarize the ideal implementation conditions: (a) I want to use a sound
source with as little distortion as possible. Black) The sound source is ideally a single point sound
source or a single direction sound source in consideration of reproduction at a general home, and
the use of this is desired. (ハ)l!! I want to feel the sound with good transmission
characteristics and good distortion rate with the program source to be produced by the loser. (D)
The listener is a living room, so some movement is naturally permitted, and I want to do
advanced reproduction without limiting this as much as possible. A method for satisfying all the
conditions under such ideal conditions will be described with reference to FIG. 7. The sound
emitted from the ideal speaker 142 is sufficiently reduced from the reflected sound generated at
the head of the listener 141. Sound is II! It can be delivered to the ear canal of the loser 1, and
the reflection sound can be absorbed by the sound absorbing material 144. If the sound
absorbing material 144 is too large and it is inconvenient, the sound absorbing material may be
limited to only the hatched portion 145 by narrowing the range of the direction in which the
light is absorbed. In the case of stereo, sound absorption from two directions is performed, and a
plurality of silencer members are provided. Furthermore sound absorbing material! 44, by
10-05-2019
8
making the size of the head relatively larger than that of the head, it has a low distortion factor
that can not be compared with the conventional methods such as electrically reflected sound
cancellation and Japanese Examined Patent Publication No. 53-21841, and It can be heard with a
good, good sound. By the way, in the case of focusing only on the ease of 11th degree, for
example, even if a large number of reflecting plates are changed to a complex silk-colored one in
place of the sound absorbing material 144, the head reflected sound generated exclusively at the
listener's head is It is removable and may have the same degree of openness. However, there is a
great possibility that it will not be useful at all from the purpose of delivering the localization
information to the ear canal without killing its localization information, using a pinaural program
source. Therefore, considering the embodiment of the present invention for the purpose of
reproducing the pinaural program source, the sound absorbing material 144 is the last power of
the transmission system generated on the head of the listener 141 at the time of reproduction
masking the pinaural localization information. Has the purpose of sufficiently reducing
localization information with various reality, and it is possible by making the total size of the
silencing members equal to or larger than the head size. ing.
Also, sound absorption V? Since the attenuation of sound due to this is a method that does not
easily lead to becoming heavy, localization information of the pinaural program source is
delivered to the ear canal without being destroyed. The above method is capable of removing the
reflected sound in principle compared with the method of Japanese Patent Publication No. 5321841 etc. as a method of putting a head reflected sound cancellation signal into the sound
generator signal source similar to the prior art. The reflection of the pinna can be reduced
sufficiently, and in the above-mentioned cancellation method, cancellation errors often occur due
to individual differences in head shape and displacement of head position, and accordingly, in the
program source Although the appearance of a new reflection sound which could not be present
in any of the head reflection sounds and the trouble of localization deterioration due to the
disorder has occurred, the present invention does not cause the trouble as described above. For
the above reasons, the present invention sufficiently reproduces the long distance KM source,
which has been considered to be difficult in the past, as long as the pinaural program source is
recorded with a dummy head having sufficient identity with the listener's head. become able to.
Next, consider the use of the present invention when the listener's physical condition is different.
Conventionally, in the case of a binaural listener, it comes from synchronized multiple sound
sources, in a non-natural sound source condition! I! Although it is possible to feel the
enjoyment of the sense of the sound field mainly formed in the sense-echelon effect, the one-ear
listener can hardly feel the enjoyment. Furthermore, it is the same in the speaker reproduction of
the Pinaural typified by フ フ オ ニ ツ ク ッ ク s, too ll! It is a strong translation that relies on the
benefits of the sense Esherrath effect, which is also a pleasure for binaural listeners only (but
with this enjoyment t, an artificial feeling as the reproduced sound is mostly associated with it)
However, although it was a convenient reproduction method only for binaural listeners, the
present invention is the cause of the above problems I! Since omnidirectional localization is
10-05-2019
9
possible without relying on the sense error and the Hearth effect, reproduction that is
indistinguishable from the real sound that could not be obtained by any reproduction method in
the past is obtained without paying attention to the listener's ear function. ing. Also, from the
above, the present invention is advanced to the unspecified conditions (for example, all the
combination of headphones and speakers, one ear and both ears) at the time of listening which
could not have been considered in the past. I believe that this is the first solution that satisfies
everything with reproducibility, but it also helps to stop the confusion of program sources. Next,
the case of faithfully reproducing the ratio of the sound pressure feeling to the ear and the back
pressure feeling to the body at the recording site (sound pressure balance) and trying to
reproduce the sound in such a way that it is difficult to distinguish from the original sound field
will be described.
As for the near distance sound source, only the compromise quantitative sound pressure sense
balance expression can be expected under the condition of the sound pressure sense balance
described in FIG. 1 to FIG. Therefore, FIG. 8 shows an embodiment in which the device of the
present invention is adapted for variable reproduction of sound pressure sense balance. The
listener 151 is made of a sound absorbing material 152 having the same effect as the sound
absorbing material 144 described in the explanation of FIG. (Not shown), holding the control box
155 in the hand, the variable sound absorbing material 153 is positioned so as to sandwich the
listener, and the variable power absorbing material 153 connects the listener 151 and the
speaker 156 by the variable power unit 154 The amount of blocking of the sound propagation
path can be changed, and the noise eliminator of the present invention is configured as described
above. On the other hand, in the case of the audio device, a speaker 156 installed with a general
60 degree opening angle to the listener is connected to the amplifier 157, and is connected to
the amplifier 157 via the program source 159 and the automatic change equalizer 158. ing. In
the above embodiment, the sound pressure sense balance can be adjusted first by the effect of
the variable sound absorbing material 153, that is, when the thin portion of the variable sound
absorbing material 153 is adjusted near the ear, the sound pressure feeling to the ear is
Compared to the sound pressure to the body, it is stronger, and it expresses the sound pressure
balance close to the reproduction of the near sound source and the upper sound source, and
conversely, when adjusted so that the thick part of the variable sound absorption material 153
comes near the ear. The feeling of sound pressure on the ear is smaller than the feeling of sound
pressure on the body, that is, it makes it easy to reproduce long-distance 1lll sound sources and
diffuse sound sources. Since the high-frequency absorption amount of the sound-absorbing
material changes significantly with the control of the sound pressure sense balance described
above, it is possible to make the transmission frequency characteristics always flat by changing
the automatic change equalizer 158. Also, the speaker may be moved instead of the change in
the position of the sound absorbing material. Next, to describe what kind of information the
control of the sense of sound pressure balance should be based on, the simplest and N simple
method is to move the control box 155 by the listener himself, and by the command signal 1510
10-05-2019
10
of this. If there is a technique to be performed and knowledge is extremely easy to judge, for
example, it is rough from before you listen to the sound of a Japanese musical instrument played
between Japan, the sound of a pipe organ played at a church, etc. There are not a few examples
that can be wm, and it seems that even this degree of control has reached the practical
application range.
The command signal 1510 may be a low-pitched artificially created as an expression means of
sound pressure puzzles, or it may be considered to use a signal obtained by measuring the sound
pressure feeling balance. A method is also conceivable in which the listener 151 is also listened
to at the same time to give feedback as needed whether the desired row pressure feeling balance
is achieved. Now, the variable sound absorbing material and the variable power unit thereof are
not limited to the forms 153 and 154 described above, and other various ones can be considered.
For example, a sound absorbing material is flexibly installed around a balloon and replaced with
a variable sound absorbing material, The purpose is to change the expansion of this balloon, and
if the electric sound wave cancellation and noise reduction structure, which is described in detail
in FIG. Can. In addition, if it is desired to express also the sound pressure feeling balance close to
the headphone hearing, a variable sound absorbing material is separately prepared to surround
the listener if desired, and the variable sound absorbing material 153 is separately prepared at
the extremely thin position. By emitting the sound absorbing effect of the variable sound
absorbing material, it is possible to further attenuate the sound pressure feeling of the body.
Next, Fig. 9 and Fig. 1θ are the embodiments considered to further strengthen the reduction
effect of the localization information with the last strong reality of the transmission system which
occurs exclusively in the listener's head, thereby further industrially It is easy to use. Referring to
FIG. 9 as an example, when the listener 2001 wears the tension belt 2004 as shown in the figure,
tension is generated to push the pinna 2002 in the direction of the milk projection 2003 to
deform it. This makes it possible to approximately eliminate the characteristic reflections that
would otherwise occur in the ear, by making the conditions of the ear different with respect to
the normal, thus making it compact and having similar effects. Also, in the condition E, the sound
absorbing material 2005 is removed when the rope belt is positioned at the concha of the ear,
and the sound collecting ability of the concha is also reduced. It is also useful as a protrusion for
preventing misalignment of the belt. The present embodiment configured as described above is
71 '! Considered to reduce the highly realistic localization information that comes at the end of
the transmission system. The sound absorbing material 144 indicated by l is corrected for the
same purpose. In other words, this embodiment is considered to be used in combination with
other sound absorbing materials, and the pattern is only for the combination with the design of
the sound absorbing material for removing head reflections, and the number is very large. I will
omit the details here, but as a practice that is as good in use as this rope-like belt, the method of
side-pressing on the ear that is often used for sodophones is raised, and the sounding body of
headphones is usually fQ It is conceivable that the same auricle deformation can be made
possible by positioning a rope-like object having tension on R (see FIG. 10 @).
10-05-2019
11
Next, FIG. 11 shows a simple combination of sound pressure sense balance con) CI and the
reduction of the localization information with the transmission system last powerful reality
occurring exclusively in the head of the auditory Jll 1 °. An example of providing an excellent
one. First of all, the ideal head reflection removal method will be described again. (A) The sound
absorbing material 144 of FIG. 7 is used as means for attenuating the head reflected sound. (B)
The direction of sound generation of the speaker is one direction per channel (without any
restriction on the phase or phase, interference distortion always occurs). (C) The speaker
reproduces the localization information mixed in the pinaural program source as it is, without
breaking it, and it is necessary to look into the listener's ear, so physical characteristics use
extremely good ones. The sound reproduced under the conditions of (a) to (C) can be heard
extremely faithfully in the ear canal of the listener. However, the characteristics of the
reproduction speaker are not always satisfactory. In such a case, the above-mentioned ideal
reflection removal (a) is not always necessary, and although it is slightly weaker than the abovementioned reproducibility, A solution that can be regenerated can be used by slightly modifying
the apparatus described in the description of FIG. The equipment means using a combination of
many reflectors in place of the sound absorbing material 144, and since the head reflection can
be unspecified, the peak dip that occurs exclusively at the listener's head It disappears, and the
same level of ease of listening is possible. The above-mentioned instrument gives variety to the
angle of sound incident on the ear canal, and as if the sound source is in a diffuse state, it has no
reflected sound from the head, but if it penetrates the purpose, The above-mentioned reflecting
plate wants the thing of innumerable combination, and it is this embodiment that it thought that
it was not the method by reflection there but the idea by the diffraction effect of the thing, and
that the same effect was easily obtained. By the way, the simplified noise reduction device to be
described in the following is a major feature in that it is -ahwk for low priced speakers and that
this noise reduction device can also adjust the sound pressure balance at the same time, but it
can be adjusted. is there. One example is shown in FIG. (A) The listener 2201 adjustably mounts a
sound insulating member 2204 having a similar supporting member to a headphone, which is
likely to generate a diffracted sound, and the supporting member is not particularly shown), and
asks for the sound of the speaker 2202. (0) The sound insulation member is adjusted so as to
block the sound propagation path 2203 connecting the speaker and the ear canal 2205. (C) The
diffracted sound propagation path 2207 produced by the diffracted sound 2208 generated by
the sound insulation member arrives at the ear canal at an angle close to the direction 2209
connecting both ears with respect to the sound transmission path 2203.
(D) The size of the sound insulation member is desired to be one size larger than the size of the
head, and this makes it possible to adjust the balance of sound pressure sense as much as the
sound insulation member impedes. Of the head reflections, the most influential face reflections
can be easily eliminated by attaching the sound insulation member 2204 on the face without any
10-05-2019
12
gaps (such as the sound absorbing material 145) Even if you do not use, if you lower the
qualitative level of playback, you will be able to substitute with such a small object), but
correction of forward localization using reflected sound of the face will absorb the side of the
sound insulation member 2204 close to the face It is better to use the sound leakage of the
sound absorbing material as the material and to obtain a better effect. (To) The state of the
diffracted sound 2208 changes in accordance with the frequency, and the direction of the
diffracted sound propagation path 2207 also changes in a complicated manner. Therefore, when
normal natural sound that should be composed of a large number of frequency components is
reproduced, the listener's directionality of the sound of the speaker being reproduced is the same
as when the sound absorbing material 145 is H-weighted. Also, I do not have to feel the peak
sound that occurs exclusively at the head. As is apparent from (a) to (f), in the case of
reproduction using a simple type speaker, the present embodiment does not require a large
object such as the sound absorbing material 144 of FIG. 7, and the sound insulating member of
FIG. Can be substituted by a relatively small object like this, so that it has an effect that it does
not get in the way of the field of view and provides a low-cost, good-to-use thing. FIG. 12 is an
instrument designed to reduce the constraints for obtaining excellent forward localization
reproduction in a pinaural program source. The above restrictions are: (a) The pinaural program
source is sufficiently recorded to a dummy with sufficient identity to the listener's head · Forward
far-distance Wi9, which was conventionally considered to be difficult, is sufficiently reproduced
No, generally a dummy head is a national policy to have complete identity, even to a greater or
lesser extent than the listener's head. In a word, it does not matter if the panaural program
source to be used was recorded with a dummy head with sufficient identity to the listener's head,
but otherwise, a lifehead is created specially, thereby recording It is not possible to reproduce the
forward far distance sound source sufficiently without using the (B) It is necessary to use a
device excellent in distortion factor characteristics and transmission frequency characteristics for
the reproduction system. (C) It is also necessary to strictly adjust the correction of the
transmission amount R number accompanying the control of the sound pressure sense balance. If
one or more of the above restrictions (a) to (C) are not satisfied, it can be said that the forward
far distance sound source can not be reproduced sufficiently.
Although the restrictions of the reproduction system can be dealt with with effort, the
restrictions on the program source side have already been many in the past, so it is desirable to
be able to somehow reproduce from these restrictions. One of the answers is that it can be said
that the uncertain forward localization information is somewhat pseudo without relying only on
the program source side, but it is thought that it is intended to delete completely as described in
FIG. By making the present invention in such a configuration as to slightly leave part reflections,
it is possible to localize the forward far distance sound source (if there are too many left contacts,
masking of the localization signal contained in the inolar signal, enolarial signal is masked) In
practice, it is desirable to add localization information of a very small amount of speakers
installed in the front within a range where effects can be found. Then I give the example. In FIG.
10-05-2019
13
12, the listening program of this listener assumes a binaural program source recorded with a
dummy head which can not be said to be sufficiently identical to the above-mentioned listener's
head, and it is also far ahead I am trying to play a sound source. To make it easier for listeners to
explain, 7L! A sound absorbing material 2004 having the same purpose as the sound absorbing
material 144 described in l is attached, and nothing is attached on the right side to be #Ra (it is
basically the same sound absorbing material on the left and right). And the sound source is a
speaker with a setting of normal opening angle 60 degrees, and it is not shown in particular, and
the right question 2301 explains the questioning condition of the sound on the right, explains
the questioning condition on the left The left face 2302 is a cross section 2303 which is a cross
section near the ear to clearly show how the sound is incident near the ear canal. The sound
coming into the listener's ear is mainly divided into direct sound and head reflection sound, and
when the sound is represented in the figure, the direct sounds become 2307 and 2309 and the
front sound reflecting portion 2311 The head reflection sound produced is 2306 and 2308. In
addition, when not listening to the playback sound but listening to the natural sound source, the
most significant cause for the listener to feel particularly the sense of front and back in the
direction of the sound is the reflection sound on the head, and of course the head reflection that
makes the front sound feel naturally It can be said that it is the front sound reflecting portion
2311 shown by being surrounded by a curve of points on the surface of the head in the figure
that is useful for making a sound. Now, for example, considering how to listen to a listener who
performs 4 on * 2001, the information on the position where the listening speaker exists can be
felt at least by the right ear since nothing is attached to the head. As for the head reflection
sound, it can be said that the information existing in the speaker is clearly captured as it is, so the
localization information mixed in the program source is almost masked and not in the state of
being listened to ing.
Next, considering the listener's hearing in the left face 2302, from the left ffi 2302 and the
sectional view 2303, the sound of the listening speaker is reflected by the direct sound 2307 and
the front sound reflecting portion 2311. The different factor of how to hear in the right ear can
be said to be the presence or absence of the sound absorbing material 2304, and in particular,
the head reflex sound is mainly reduced. . However, as described in the L note, this embodiment
is characterized in that some head reflection sound is left. The sound that can be heard with the
noise reduction device as above, the localization information mixed in the program source will be
heard as it is, and the localization of the forward far-distance sound source that should not be
reproduced sufficiently from the beginning remains slightly The sound localization caused by the
reflected sound generated by the front sound reflection part is shifted forward, and it is possible
to obtain the sense of a forward but important front position, even with such a program source.
Also, as a simple know-how in the practice, the adjustment of the rabbit 2305 is given by one, to
this thickness, the head reflex if, and the concha reflex sound 2310 (this is also not the head
reflex sound 2306) However, the degree of reduction of A is considered to be somewhat related
to the forward localization, that is, the delicate balance between the forward localization and the
10-05-2019
14
other localization is strongly dependent on this adjustment. Thus, in the description of FIG. 7,
head reflections, which are described as extremely harmful, are also extremely useful for
removing the forward uncertainty localization that occurs during the reproduction of the
pinaural fist program source, when the conditions are limited. It turns out that it becomes a
thing. FIG. 13 is an embodiment intended to further eliminate the problem of forward uncertainty
localization that occurs during the reproduction of the above-mentioned pinaural program
source, and will be described below. In FIG. 13, the listener 2401 uses the same sound
absorption + 82402 as the sound absorbing material 2304 of the preceding paragraph, and
differs therefrom. The point is that the gap 2403 is freely opened by 5 jui. This gap can maintain
the natural reflection state of the front sound reflecting portion 2405 as compared with the nonprovided state, and the attenuation of the head reflected sound 2404 is also an effect of the
space, and it is characterized in that it is more efficiently accomplished. It has become.
Furthermore, this gap has the advantage that it can not be overlooked that it is possible to escape
from the pain and skin disorder by not touching the listener's skin with the @ sound material.
FIG. 14 shows an embodiment in which the various sound absorbing materials described so far
are made more excellent by an electrical method, and it is considered for the members having all
the above-mentioned noise reduction effects. And will be described below.
As shown in FIG. 14, the electric sound wave cancellation member 25ON is one engraving of the
muffling member, and responds to various correspondences by controlling the finer sound (by
making the call quick and controlling by feedback). It is intended to be The electric sound wave
cancellation member 2501 is, in other words, a configuration of an MFfl (modal feedback)
speaker, and in this case, a condenser type is taken as an example for ease of explanation. The
constituent elements make the drive electrode 2503 and the sensor electrode 2504 exactly in
the plane through the insulator 2505 to each other, and open the gap in parallel and make the
vibration electrode 2502 in front of them. Install and ground. In addition to the above basic
structure, as an electric system, there are a phase correction unit 2506 to which signals of sensor
electrodes are connected, a filter portion 2507 provided in series thereto, and an amplifier 2508.
Next, the operation will be described. The reproduced sound passes this load to the point where
it enters the ear, so that the vibration pressure shakes the vibrating electrode due to the sound
pressure. Then, information on the change in electrostatic capacitance is captured as an electrical
signal in the sensor electrode, the signal is amplified by the amplifier, a voltage change is given
to the drive electrode, and the vibration electrode receives energy to be photographed. Move.
Under this condition, the sound that is incident does not have the sound pressure attenuation of
the target passing sound, and in some cases it is not necessarily excited significantly. A phase
correction unit is provided for this purpose, and by passing it, the j instigation electrode is
controlled to a phase state where the passing sound pressure can cancel out. Next, the amount of
cancellation of the passing sound pressure needs to be controlled for each frequency or at all
frequencies, which is part of the filter. Also, a part of this filter may be wlmb using control signals
from other systems. It can be said that the sound pressure attenuation method of the above
10-05-2019
15
configuration can sufficiently exert its effect in a narrow area where it is limited only to the
vicinity of the ear, whereby the following effects (i) to (ha) can be obtained. (A) The control in the
low frequency region conventionally is determined by the size of the sound absorbing material or
noise reducing member and the sound insulating member used, and the control of 0.1 KHz or
less is difficult as described in the explanation of FIG. However, it makes it possible to realize low
frequencies within the audio frequency. (B) By electrical control, any change in volume reaching
the ear and any change in transmission frequency characteristics reaching the ear? You can
choose ζ.
(C) Sound pressure balance, individual differences in head conditions, compatibility between the
pinaural program source and the listener, etc. can be solved simply by electrical control, and it is
also possible to obtain combinations of the above simultaneously. FIG. 15 and FIG. 16 show an
embodiment for solving various problems due to the unique crosstalk to the sound source of two
or more channels. The above problems are listed below. (A) When the pinaural localization made
possible by head reflection removal is pushed down to a sufficiently satisfactory place, the
badness of this crosstalk noise becomes noticeable. Therefore, it will be necessary to remove this.
(B) In the case of a sound insulation board type, which is a conventional method for removing
crosstalk sound, there is no consideration for vision, and in particular as it is, it will cause great
hindrance to fusion with visuals. (C) There is a sound insulation plate type, which is a
conventional method for removing crosstalk noise, or the center of the field of view is blocked,
resulting in extremely unpleasant feeling. (D) Crossing noise removal and widening of the field of
view are contradictory factors, and there is no method that satisfies both. The above problems (a)
and (L +) are solved by the embodiment of FIG. 15, which will be described below. The listener
2601 looks at the right video device 2607 positioned so as to obstruct the propagation path of
the sound connecting the right speaker 2605 and the left ear 2602, and similarly the
propagation path of the sound connecting the left speaker 2604 and the right ear 2603 Looking
at the left video machine 2606 positioned to prevent Further, sound absorbing materials 2608
and 2609 having the same effect as the sound absorbing material 85 ° 144 in FIG. In this way,
it interferes with the left and right crosstalk 1! Positioning the torsion changes the sound
insulation board upside down into visual enjoyment, which was originally a hindrance to the field
of view, and at the same time it is possible to design without restriction, without worrying about
the hindrance to the field of view. The entire configuration described above, which can
sufficiently eliminate the problem, is one implementation of the present invention. J-, the rest of
the problems (c) and (d) are solved by the real V @ example of FIG. 16 and will be described
below. 16 is basically provided for sound absorbing members 2701 and 2702 which are divided
into two groups on the left and right for eliminating head reflection sound, for those who do not
use visuals as in the embodiment of FIG. The sound absorption is made clear by opening two
points radially around the viewpoint of the listener 2701 and positioned by the two fixing
members 2703 and 2704, and even if a large amount of sound absorbing material is used, the
field of view is not extremely taken away Shows a method to
10-05-2019
16
Also, if you want to take a slightly abbreviated shape, you can remove some discomfort due to
the obstruction of the visual field even if you separate the sound absorbing material so that the
space 2705 is fully opened. The noise eliminator having the above-described configuration is
taken as one embodiment. Next, to explain another embodiment for further improving the feeling
of use, when it is desired to make fine adjustments in the vicinity of the listener's ear, if the state
retention is strongly required, the listener's body movement will necessarily be restricted. .
Therefore, as shown in FIG. 17, in order to solve this contradictory factor, m 2804 for
deformation of the pinna attached with acoustic material 2805 for reflection of the concha is
compared with the head in front of this net and the head. A small small noise eliminator 2802 is
provided so that the above whole can be fixedly supported on the listener's head by a head
support 2803 similar to headphones. Furthermore, an auxiliary muffling device 2806 by a
support different from the listener is provided gl / l freely. In the use of such an embodimentonce adjusting the small car sound absorber and the sound absorber for the concha reflector, it
may be possible to think from the situation without doing this. Each time you move, you will be
able to listen in the long open condition, as long as you don't have to wait for it, as it will stop
making it fine and adjust it each time. Next, referring to FIG. 18, an embodiment in which the
listening change accompanying the rotation of the listener's head in the case of using a 1 °
nonaural sound source sounds closer to the state in which the natural sound is heard Do. It can
be said that it is general to think that the listener's listening condition is always moving slightly,
and even in the sense of direction in the sense of @, the sound pressure that can be obtained with
this movement, especially the movement of turning. Information on change is very important.
Therefore, although an example is given in a pseudo manner, an embodiment in which the
localization in a predetermined direction is heard without changing as the natural sound is heard
with respect to the rotation of the listener's head will be described with reference to FIG. 18 as an
example. In FIG. 18, the sound deadening device and the accessory device are supported by a
restricting member 2905 for rotatably pressing the head of the listener 2901, a sound absorbing
material 2902 and 2903 for removing head reflected sound, and a stand 2904 for all of them.
The structure is At the positions of the speakers 2906 and 2907, the listener drawn with a solid
line faces to the left, and the ear drawn with a dotted line is the position of the ear when facing
the front. The sound phenomenon to be described in the following is premised on the use of a
pinaural signal as a program source, and the recording contents are assumed to be 2rN at the
front center and the left rear, and the localization position rM, 29H1 ° 2919 to simplify the
explanation.
So, if you explain why restricting the movement of the listener's song to rotational movement
with one central axis, the novel effect can be explained. , 2910, the localization is 91 sections in
total so as to be heard at two localization assumed positions 2918 and 2919. At this time, the
distance between the ear position and each of the speakers 2906 and 2907 is equal to the
10-05-2019
17
distance 2915 or 2913, which should normally be set to the same distance, and in this case as
well. So far, it has been possible to achieve satisfactory playback naturally as before, but the
following problems arise when the listener shakes his head to the left as shown by the solid line.
(A) The distance between the left ear position 2911 and the speaker 2906 is a distance J12916,
which is closer to the speaker by 2917 than when facing the front, while the left ear (ffrIt 2914
and the speaker 2907 The distance of the speaker 2906 is longer by a distance 2914 minutes,
and the condition of the left speaker 2906 is perceived as being largely offset due to the Hearth
effect as a matter of time. (0) Due to the above distance conditions and changes in the orientation
of the ear canal and pinna, a specific numerical value is not particularly indicated, but there is a
considerable amount of volume deviation (right for strong, left for weak) The listener sounds as if
the estimated localization positions 24118 and 2919 are drawn near the speaker 2906%. The
means for reducing the abnormal localization due to the above reasons (i) and (0) is the
regulation of the head movement of the SO person in FIG. 18 and the sound absorbing materials
2902 and 2903 positioned in relation to the rotation thereof. If you do not restrict your head
movement as you do not implement it, and if you do not include the shape of the sound
absorbing material for removing head reflections or the idea to be described in the position with
the listener, On the other hand, localization information will be largely broken. The idea is that
when the listener's ear position becomes, for example, 2911, the sound absorption material 2902
is made to hide the propagation path of α connecting the ear canal and the speaker accordingly
according to the amount of rotational deviation. Construct a sound absorbing material. Also,
conversely, the left ear on the opposite side is designed to constitute the sound absorbing
material 29o3 so that it changes from the ear position 2909 to 2908 and the number of fireflies
obstructing the sound propagation path by the sound absorption 2903 decreases. . In the
embodiment configured in this way, localization is assumed. Not only in the aH 291B but also in
2919, by determining the rotation conditions of the listener's head, the listener is listening to the
sound 11N of the natural world, although it is simulated for the former head's rotational
movement of the listener Similarly, it is possible to enjoy the reproduced sound without change
with respect to the determined sound source direction relative to the absolute position rR (for
example, the ground).
Figures 19 and 20 show that one of the listeners! ! An embodiment of the method of setting the
leisure conditions more strictly, thereby realizing the desired combination of the deliberation of
the listening direction and the fidelization of the reproduced sound desired in FIG. 18 with an
ideal method, not a compromise. It is shown. The outline of the ideal 3D sound reproduction
conditions is listed below. (A> Each device is attached to a rotating chair and used in order to
achieve both strict listening conditions and improvement in usability. (B) Have you adopted
multi-channel recording with multiple dummy head microphones with slightly different
directions, and has the playback speaker also met that? ! Enable sound generation from a
number of angles. (C) The difference from normal multi-channel playback is that vl is limited so
that the direction of the actual pronunciation of the speaker is one corner per channel, no matter
10-05-2019
18
how many channels are recorded for playback of program sources The point is different from the
conventional multichannel reproduction method (for example, physical sound field reproduction
means). (D) A speaker for connecting channels is synthesized and reproduced, so to speak, that is,
the speaker for connecting channels is out of the restriction described in (C), when the listener is
facing at an angle which was not in the direction of the microphone during recording. But admit
to use as an exception. (E) As the detection method to know which direction the listener is facing,
there is a method of obtaining the rotation change of the support axis of the child as the least
expensive one in conjunction with the selector. The use may also be reliable. (F) In the
embodiment shown in FIG. 19, since the control of the sense of sound pressure balance has been
sufficiently described, it will be omitted. Here, the explanation will be mainly made mainly on
reproduction of head reflection noise removal. (8) The embodiment in FIG. 19 raises questions
about the generality due to the multichanneling of speakers and amplifiers, but the recording
system has become relatively common due to the widespread use of multichannel recording
today. I think that there is no resistance in the use of this because it has become. Therefore, it is
obvious that the user can be greatly helped if it is possible to suppress one speaker and amplifier
to the usual two channels or four channels without losing the function, and the embodiment is
also shown in FIG. (H) The feature of the embodiment of FIG. 20 is that instead of using a multichannel speaker and a multi-channel amplifier, the problem of reflection quality is caused by the
fact that the reflecting plate is rotated. Depending on the movement, there is a great advantage
which does not occur in the reproduction example.
From the example shown in FIG. 19, the listener can sit freely on the gyroscope 3002 and the
swivel chair 3008 with the sound absorbing material 3009 and 3010 and use his / her feet
freely to hear the embodiment of the outline of the above (a) to (f). It is possible to change the
direction of leisure time. On the other hand, the program source uses dummy head tel 3004
recorded by multi channel recording with recording / reproduction system 30θ6, and speaker
group 3003 is a multi-channel (here 10 channels) amplifier 3005 and recording / reproduction
system 3006 with gyroscopes. By interlocking in a relationship like the dotted line of the
command signal command signal jt 3007 by the obtained arbitrary signal, it is possible to sound
the speaker according to the rotation of the listener. Describing in more detail the interlocking of
the command signals, focusing on the letters A to E in the figure, for example, when the listener
faces front and is listening, the dummy head microphone uses the signal at the top On the
reproduction side, the command signal 3007 is based on the signal coming from the gyroscope
so that the third speaker, which is shown as AD and AE respectively from both ends in the
speaker group, is in a sound producing state. Works. Next, when the direction is slightly changed
to the right, the dummy head microphone uses the third signal C from the top, and the
reproduction side uses the speaker, which is also indicated by C in the speaker group, to
command the command signal to be pronounced 3007 works. As indicated by letters A to E
below, they are switched and sounded, but in the case of speakers, as letters A to E are plurally
used, they can be used in combination, so that the number of speakers can be saved. Next, an
10-05-2019
19
example of the outline of (h) is as shown in FIG. 20 ', and the difference from FIG. 19 is that there
is only one pair of 3105, 3106 and a speaker, and a chair, and a chair. The reflectors 3107 and
3108 move with the rotation of the amplifier, and the number of channels of the amplifier is only
two channels. To explain the operation, the listener 3101 is a support bar 3109 to move with the
swivel chair 3102. A chair having a reflection plate 3107 and 3108 connected at 3110 is seated,
and a rotary chair 3102 is configured such that a desired rotation change (a rotation angle is
limited) can be made by a foot. Further, this change in rotation is immediately converted to an
electric signal of the command signal system 3104 by the gyroscope 3103, and this causes the
signal from the recording / reproduction system 3112 entering the 2-channel amplifier 3111 to
be switched. There is.
The program source is the first! l)V! Similar to U, the signal obtained by the five-piece
Tammy head group 3113 is used. In FIG. 20 configured in this way, if the reflective frequency of
the 15 reflector and even the fidelity are not an issue, the simple structure is similar to using a
large speaker. Also, when the fixed speaker's setting position is set, if the listener's desired
rotation angle is large, it should be as close as possible to the center of rotation, such as overhead
or foot, with consideration that the listener will not hear direct sound. You should Finally, if the
speakers are light and satisfactory, it is best to bring the speakers instead of the second (l's
reflector. The various effects described above are implemented based on constructing the present
invention on a human supporting object such as a chair. FIG. 21 shows a simple control of the
sound volume generated at the time of attachment / detachment of the sound absorbing material
for removing the head reflected sound of the listener or the sound absorbing material for
balancing the sound pressure amount to make the feeling of use smooth. And will be described
below. There is an extremely large difference between the sense of volume felt by the listener
when the sound absorbing material is attached for the purpose above and when it comes to a
state that satisfies both the head and feather noise removal and the sound pressure balance.
There is also a frequency band reaching 20 to 30 dB at the peak. If there is such a large
difference in volume, it is extremely difficult for the listener to feel that the sound absorbing
material is attached and removed without changing the playback sound level, and the volume of
the playback sound is adjusted at each time as it is attached and removed. I want to. Therefore, it
is an embodiment shown in FIG. 21 to automatically change the sound volume by utilizing the
action of attaching and detaching the sound absorbing material, which will be described below.
The sound absorbing members 3202 and 3203 are configured to be able to change the angle
with the variable resistor 3205 as No. 11, and the variable resistor 3204 is also provided to slide
depending on the distance between the two sound absorbing members. An infrared lamp 3206,
serving as a light sensor to search for whether or not the sound absorbing material has come to a
predetermined position, and a participant 3207 are provided. WN of the speaker for
reproduction is controlled to be large at the time of wearing of the sound absorbing material, and
smaller at the time of removal, according to the removal speed and condition, using some of the
above three types of information. It can be seen that this is easily possible in this example.
10-05-2019
20
(Effects of the Invention) The present invention has the following effects (a) to (h).
(A) The balance between the amount of sound pressure received by the auditory organ and the
amount of sound pressure received by the body and the balance of the sound pressure are
determined by the distance between the speaker and the listener. There is a problem of being
fixed, and therefore, the sound pressure amount balance obtained at the distance between the
listener and the stage at the time of listening to music at the time of leaving can not be obtained,
and the reproduced sound makes the speaker aware. In addition, a gap between the information
recognized by the body and the information recognized by the ear is generated by the above, and
this cap causes the localization of the reproduced sound to be shifted up overall, making it feel
unnaturally floating localization It was In addition, he was made to be awkward to have a calm
sound image expression that came to the ground. In the present invention, since the muffling
device capable of changing the muffling effect is disposed near the head of the loser, when the
muffling effect is increased, the sound is far, near the diffused sound, to the body side. It is
possible to listen to the biased sound pressure balance, and also to listen to the same sound
pressure balance biased to the ear side as in the case of opening the near sound, if the noise
reduction effect is reduced as described above, and further, it is extremely superior. In order to
enable sound pressure balance equivalent to listening to a short distance sound source, it is
possible by separately preparing a silencer and shellfish configured to wrap the body and using
them together. As described above, since the sound pressure amount adapted to the image of the
program source can be arbitrarily expressed, the problem of the shift phenomenon can be
eliminated, that is, the abnormal localization unique to the reproduced sound can be eliminated.
In addition, even if such a sound pressure amount change is made, it is faithful to the program
source, and the listener can enjoy it with a good sound without distortion and problems of
transmission frequency characteristics. (B) Independent problems of the left channel and the
right channel, that is, the problem of the presence of head reflection information capable of
recognizing the speaker position. Due to the existence described above, in reproduction other
than the same real image as the speaker position, a deviation from timbre pattern recognition at
an arbitrary sound source position learned by the ear will occur, and in particular reverberations
etc. having no directivity will be deviated. Is an artificial reproduced sound that causes the
speaker to be recognized, and sometimes the peak due to the head reflected sound is too sharp,
which may lead to a situation where it is not possible to stand it. It also killed the localization
information of the pinaural signal. Also, as a method for removing the recognition of the speaker
position due to the one-ear effect, Japanese Patent Publication No. 53-21841 has been proposed,
in which a change in transfer characteristic due to head reflection is obtained by the acoustic
signal having cancellation information of the change. There is a big problem that the effect can
not be obtained unless the angle of one head listens to the head of the shape of the face and the
detailed characteristics of the speaker are not limited.
10-05-2019
21
In the present invention, as shown in FIG. 7, the reflected sound from which the localization of
the sounding body generated at the listener's head can be known can be removed by the sound
absorbing material 144 or the like. Can be removed, along with this, because the reflected sound
generated exclusively at the listener's head at the time of reproduction is also eliminated, which
kills the pinaural localization information, so the sound in all directions even in the front two
channels (front and rear, left and right , E. lower) can be reproduced, and reproduction extremely
faithful to the sound image direction of the original sound field can be realized. In addition, the
method of thinking the head reflection sound cancellation signal into the sounding body signal
source, which is similar to the prior art, of the method of the Japanese Patent Publication No. 5321841 etc. Yes, there is an effect of sufficiently reducing the reflection of the pinna, and the
above-mentioned cancellation method is the appearance of a new mixed sound that is present
and not obtained in the program source and the listener's head along with the occurrence of a
cancellation error. Although the localization and the sound quality were deteriorated due to the
failure, in the present invention, the above problem could be avoided only by selecting a sound
absorbing material having a good transmission property. (C) The greater the number of
loudspeakers, the more it is possible to reproduce the long-distance sound pressure balance, but
the more loudspeakers, the greater the mutual interference between the loudspeakers and the
greater the distortion. Moreover, since the said distortion erase ¦ eliminates the localization
information which a pinaural has, the localization worsened. Also, there is a method to give a
direct imaging motion to the skin though there is a special 1m Sho 58-107794 and a Japanese
Utility Model Sho 52-103909 that tried to get a sense of sound pressure even with a headphone
or a relatively short distance speaker. Because I was taking it, basically I felt discomfort in the
sense of sound pressure. In the present invention, by using the sound absorbing material 144 of
FIG. 7 for removing the reflected sound generated in the head of the listener 9, sound pressure
sense balance and binaural sounding can be realized, and conventionally obtained only by using
a large amount of speakers. The sound pressure sensation that could not be achieved could be
resolved with the speaker in two directions with a minimum of stereo as a sound generator. In
addition, since the sound given to the sense of sound pressure is the same as the sound given to
the auditory sense, the difference in time does not occur in principle and you can enjoy the low
distortion without the mutual interference that was generated in the same dance type. It became
so. In addition, since the Jfi 411 given to the body is not a mechanical imaging motion but an
actual sound wave, it is possible to eliminate the discomfort caused by the mechanical vibration.
cd) The possible conditions of median plane and normal back position in pinaural reproduction
were required to satisfy highly similar conditions of the artificial human head used at the time of
program source creation and the listener's head.
Also, the above conditions mean that the average pseudo-human head can not be used, which has
been a major obstacle to program source production examples. In the present invention, when
listening to a program source suspected of being identical to the listener's head and dummy /
sodo / microphone, the head sound reflecting portion 2311 is generated from FIG. 12 when the
10-05-2019
22
head reflected sound is removed. A sound absorption unit JFA '2304 for removing head
reflections is formed to leave a slight anti-I4 sound. Therefore, the sound heard as described
above hears the localization information mixed in the program source as it is, and the localization
of the front far distance sound source, which has been considered to be difficult in the past, is
slightly reflected from the front sound reflection The reflection sound generated by the part
caused the localization to move forward, and this pseudo, but important, constant sense of
forward EJ can be obtained even with such a program source. Also, in order to reduce the
reflected sound generated by the front sound reflecting portion without breaking it down and
deliver it to the ear, a sound absorbing device should be provided so that a space connecting the
front sound reflecting portion (231+) and the listener's external ear canal opens at the shortest
distance. It is also considered to be configured. (E) In making a good localization program source.
What is a major obstacle is the variation in expression due to the form of reproduction. That is,
specifically, the type of the reproduction form is a quantitative environment surrounding the
speakers, an angle between the speakers, and a distance between the listener and the speaker
(very close to a headphone). Next, the variation in expression accompanying this is the presence
or absence of the phenomenon that the localization is pulled to the speaker position, the
variation in the speaker position, the correlation between the left and right that are greatly
dispersed due to the difference in reverberation, and the like. As for the above-mentioned various
kinds of variations, the smaller the better, but the better, but there is a problem that is not
enough to solve it. According to the present invention, even in the case where the sound
absorbing material 144 of FIG. 7 is used even in a condition widely separated as compared with
the distance between the speaker and the listener or the headphone, the listening without head
reflection sound is a headphone on hearing. As well as possible. In addition, with the help of the
above, the sound of the room sound could be reproduced by speaker reproduction without the
help of the room's reverberation, so the condition of the room became as simple as how the
dead's resounding was best . In addition, since the speaker position perception is also greatly
attenuated by the sound absorbing material, the speaker position on the reproduction side. The
angle deviation has been largely uninfluenced. There is no doubt that the program source in head
phono listening is that pinaural is the best.
The present invention has made it possible to reproduce the sound quality and the localization,
both in the same manner as or in excess of the head phono hearing by the hyaural reproduction
of the speaker. The invention also has the advantage that the best source of both headphone and
speaker reproduction can be shared with pinaural. In summary, it can be said that the present
invention can provide a superior reproduction that has not heretofore been enough to stop the
confusion of program sources. (F) The present speaker reproduction method, which is extremely
dependent on the binaural effect (Heath effect, right and left sound pressure balance), can only
be perceived by a single ear effect (localization effect by head reflection sound). In natural sound
listening, it was often impossible to recognize the movement of localization enough to be
recognized sufficiently. By using the present invention, omnidirectional localization listening is
10-05-2019
23
enabled without relying on left / right sound pressure balance and the hearth effect, so it is
indistinguishable from the real sound that could not be obtained by any reproduction means in
the past. ° Life was obtained without noticing the listener's earlobe ability. (3) By the effect of
(b), the speaker can also be used for the use of a speaker relatively close to the listener, that is to
say the following advantageous effects occur when the speaker is near the listener. (A) Even if
the speaker is small, the volume feeling can be relatively large. (Ii) Since the sound of the speaker
can be relatively small, noise can be relatively avoided. (C) When a speaker is mounted on a
chair, it can be made smaller because it can be made smaller, for example, when the speaker is
attached instead of the reflectors 3107 and 3108 in FIG. (H) If the muffling member can be
electrically controlled by the configuration shown in FIG. 14, the following effects are produced.
(A) The control in the low frequency region is determined by the size of the noise reduction
member used, and as described in the explanation of FIG. 7, it is impossible to control the sound
of wavelengths longer than the height, The low frequencies within the audio frequency are now
feasible. (D) A change in volume reaching the ear and a change in transmission frequency
characteristics reaching the ear can be electrically selected at will by the electrical control. (C)
Volume sense balance, individual differences in head conditions, compatibility between the
Hinaural program source and the listener, etc. can be solved simply by electrical control, and it is
also possible to obtain more control simultaneously. became.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a horizontal cross-sectional view of the listener's head.
FIG. 2 is a view showing whether the listening juice receives sound pressure as it is in the
diffusion sound field. FIG. 3 is a diagram showing the tendency of balance of feeling of line
pressure in the diffuse sound field as a function of frequency. FIG. 4 is a diagram showing the
tendency of the balance of sound pressure perception in a general monaural reproduced sound
field by frequency. FIG. 5 is a diagram showing the sound pressure sensation that the ear
receives with respect to the change of the direction of the sound source. FIG. 6 is a view showing
that the head reflection sound generated at the time of listening to stereos has significantly lost
the balance of the sense of sound pressure. FIG. 7 is a cross-sectional view of the listener's head.
FIG. 8 is a view from the top of the device and apparatus. FIG. 9 is an m-plane view showing a
state in which the reflection state in the vicinity of the ear is changed using the net-like heald.
FIG. 10 is a side view showing the pinnacle deforming member utilizing the support portion of
10-05-2019
24
the headphone. FIG. 11 is a cross-sectional view for explaining an S-shell shell for the removal of
head reflection sound utilizing a reflection effect. FIG. 12.13 is a view for explaining an apparatus
for correcting the sense of forward localization. FIG. 14 is a view for explaining an electrical
traveling wave cancellation member. Fig. 15 Channel 71. The upper view which shows the state
which removed the crosstalk between and using an imaging device. FIG. 16 is a cross sectional
view. FIG. 17 is a view for explaining an appliance whose usability has been improved by
separating sound absorbing materials. FIG. 18 is a view showing an apparatus for suppressing
the fluctuation of the localization by regulating the rotation of the listener's head. Figure 19.20
illustrates the implementation of the silencer when using a multi-channel program source. FIG.
21 is a perspective view. In the figure, 81 ... reflected sound. 82 ・ ・ ・ Direct sound. 83 ...
Reflected sound. H4 ... 85 ... 86 ... sound absorption material. 87・・・スピーカ。 88 ...
Listener. 89 ・ ・ ・ Sound pressure received by the body. 101 ... sense of pressure received by
the body. 102 ・ ・ ・ Sound pressure felt in the ear. 103 ... hatched portion. Ill ... A sense of
sound pressure received by the body. 112 ・ ・ ・ Sound pressure felt by the ear. 113 ・ ・ ・
f4 buttocks. + 201 ... listener. 1202・・・スピーカ。 1203・・・1204・・・ライン。
1205: Boundary circle. 1206 ... 1207 ... width. 1208 ... 1209 ... reference line. 1210 ... cut line.
1211 ... 12 + 2 ... width. 1213・・・1214・・・ライン。 1215・・−1216・・・
121? ... 1218 ... 1219 ... width. 131・・・ピーク。
141 ... listener. 142・・・スピーカ。 143 ··· Sound propagation path. 144 · 9 · Sound
absorbing material. 145 ··· shaded area. 151 ... listener. 152 ... sound absorbing material. 153:
Variable sound absorbing material. 154 ... variable power unit. 155−・コントロールボックス
。 t56・・・スピーカ、157・・・アンプ。 158 ··· Automatic change equalizer. 159・・
・プログラムソース。 2001−1! Sectioner. 20Q2-. 2003 ・ ・ ・ The milk protrusion.
2004 ... Reticulated belt. 2005: Sound absorbing material. 2201 ... listener. 2202・・・スピー
カ。 2203 ... sound propagation path. 2204 ... sound insulation member. 2205 ... ear canal. 2206:
Auricle. 2207 · · · Diffraction sound tii 'J 8 ° 2208 · · · diffracted sound. 2209 ... direction. 2301
... Right face. 2302 ... Left face. 2303 ... sectional view. 2304: sound absorbing member. 2305 ...
thickness. 2: (06 ... head reflection sound. 2307 ・ ・ ・ 耳 介. 2308 ... head reflection sound.
2309 ... direct sound. 231 O · · · 甲 反射. 2311 ・ ・ ・ Forward sound reflection part. 2401 ...
listener. 2402 ... sound absorbing material. 2403・・・すきま。 2404 ... head reflection
sound. 2 Jl 05: Forward sound reflector. 2501: Electrical sound wave cancellation member. 2502
・ ・ ・ Electrode for iR. 2503 ··· Drive electrode. 2504 ··· Sensor electrode. 2505: Insulator.
2506: Phase correction unit. 2507 ... part of the filter. 2508−・・アンプ。 2601-.. 2602 ...
left ear. 2603 ... right ear. 2604 ... left speaker. 2605: Right speaker. 2606 ··· Video equipment on
the left. 2607 · · · Video equipment on the right. 2608-2609 · 2701-2702 ··· Sound absorbing
material. 2703- .. 2704 ... fixed member. 2705- .. Space. 2801 ... Listener. 2802 ... Small silencer.
2803 ... head support. 2804 ... net. 2805 ・ ・ ・ Sound absorbing material for concha reflex.
2806 ... Auxiliary silencer. 2901 ・ ・ Listeners. 2902 ... 2903 ... sound absorbing material.
2904・・・スタンド。 2905: Standard 1 member. 2906・・・2907・・・スピーカ。
10-05-2019
25
2908 ... 2909 ... 2910 ... 2911 ... ear position.
2912 ... 2913 ... 2914 ... 2915 ... 2916 ... 2917 ... distance. 2918 ... 2919 ... fixed bt assumed
position. 3001 ... listener. 3302・・・ジャイロスコープ。 3003 ... speaker group. 3004 ...
dummy head group. 3005・・・アンプ。 300G ... recording system. 3007 ··· command
signal. 3008 ... swivel chair. 3101- .. Listener. 3102 ... a swivel chair. 3103・・・ジャイロス
コープ。 3104: command signal. 3I05・・・3! 06 ... fixed speaker. 3107---3108-Reflector.
3109 · -3110 · · · Support rod. 3111・・・アンプ。 3112-· · Recording system. 3113 ...
dummy head group. 3201 ... listener. 3202 ... 3203 ... sound absorbing material. 3204 ... 3205 ...
variable resistance. 3206 ··· Infrared light. 3207 ... light receiving unit.
10-05-2019
26
1/--страниц
Пожаловаться на содержимое документа