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JPH0965498

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DESCRIPTION JPH0965498
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
out-of-head sound localization and listening apparatus which is used for listening by a hearing
device such as earphones and headphones, and in particular, localizes a sound image outside the
head.
[0002]
2. Description of the Related Art Before describing the present invention, the principles
underlying the out-of-head sound localization process are described below. FIGS. 5A and 5B are
explanatory diagrams for explaining the principle of the out-of-head sound image localization
which is the basic idea of the present invention.
[0003]
A sound source signal u is emitted at the virtual sound image position O, and it is transmitted
through space to reach the left ear EL and the right ear ER. At this time, an acoustic signal at the
left ear EL is yL1, and an acoustic signal at the right ear ER is yR1.
[0004]
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In this state, the propagation of sound from the virtual sound source position O to the left ear EL
and the right ear ER can be represented by a transfer function. This transfer function is
hereinafter referred to as a head transfer function.
[0005]
A head transfer function from the virtual sound source position O to the left ear EL is defined as
TL, and a head transfer function to the right ear ER is defined as TR. The relationship between
the sound signal at the sound source position and the sound signal at the ear is yL1 = TL · uyR1 =
TR · u
[0006]
Next, consider generally the case of listening using headphones. The acoustic signals at the
headphone left ear HL and the headphone right ear HR to be actually used are respectively xL
and xR. The sound radiated from these headphones both ears arrives as an acoustic signal of yL2
at the left ear EL of the listener and yR2 at the right ear ER. In the case of hearing using
headphones, since the crosstalk component can be assumed to be sufficiently small, assuming
that the HRTF in the transmission path from HL to EL and HR to ER is HM, yL2 = HM.xLyR2 =
HM.xR Become. Here, although the sound is actually emitted from the headphone both ears HL
and HR, in order to be able to be heard from the point O, yL1 = yL2yR1 = yR2 may be set.
Therefore, HM.xL = TL.uHM.xR = TR.u. If xL and xR are solved, then xL = FL.uxR = FR.u can be
obtained. ただし、FL=TL/HM、FR=TR/HMである。 Also, the above equation can
be rewritten to represent xL = FM.uxR = FM.FC.u. ただし、FM=TL/HM、
FC=TR/TLである。 That is, if the signal processing represented by the above equation is
applied to the sound signal u, it sounds as if there is a sound image at point O when listening
using headphones, and the out-of-head sound image localization can be realized.
[0007]
The principles described so far have already been published in the 1960s, and are known from
many documents (as a representative example, "Spatial Acoustics" published by Kajima
Publishing Co. and edited by Brauerto, Morimoto and Gotoh). It is a fact.
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[0008]
SUMMARY OF THE INVENTION However, in the case of listening to an outside sound image
localization by a listening apparatus such as headphones using such an outside sound image
localization process, the listener can feel a sense of localization outside the head of the sound
image so much. There was also a problem that the time taken to realize the feeling of out-of-head
localization was large, and the individual difference among the listeners was large.
[0009]
The present invention solves the above-mentioned conventional problems, and it is easy for the
listener to feel the sense of localization outside the head of the sound image, and the time taken
to realize the sense of localization outside the head of the sound image can be shortened. It is an
object of the present invention to provide a sound image localization headphone listening
apparatus and a listening method thereof.
[0010]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, an out-of-head sound localization headphone listening apparatus and a listening
method thereof comprise an out-of-head sound localization sound signal storage unit storing outof-head sound localization sound signals. And an extra-head sound image localization processing
unit that performs an extra-head sound image localization process on an input sound signal, a
cross fade processing that switches the output from the extra-head sound image localization
sound signal storage unit and the output from the extra-head sound image localization
processing unit In an extra-head sound localization headphone listening apparatus provided with
a head unit, when the listener listens outside-head sound localization headphone, the listener first
listens for the extra-head sound localization sound signal stored in the extra-head sound
localization sound signal storage unit After that, the crossfade processing unit is switched to the
output from the out-of-head sound image localization processing unit for listening.
[0011]
Further, according to the present invention, there is provided an acoustic signal storage unit
storing an acoustic signal that facilitates localization of an extracorporeal sound image, and an
extracorporeal sound image localization process performed on an input acoustic signal and an
acoustic signal stored in the acoustic signal storage unit. An out-of-head sound localization
headphone listening apparatus comprising: a sound image localization processing unit; and a
cross fade processing unit that switches an input to the out-of-head sound image localization
processing unit between the input sound signal and an output from the sound signal storage unit.
When the listener listens to the extracorporeal sound image localization headphone, the
extracorporeal sound image localization processing section performs the extracorporeal sound
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image localization processing on the sound signal that is easily stored in the sound signal storage
section and is easy to be localized. And then listening to the result of performing an extra-head
sound image localization process on the input sound signal.
[0012]
[Operation] When the listener listens to the outside sound image localization headphones, the
head stored in advance in the outside sound image localization sound signal storage unit before
listening to the result of performing the outside sound image localization processing on the input
sound signal Listen to an acoustic signal that is easy to localize the external sound image for a
certain time.
Then, when the listener feels the sense of localization outside the head of the sound image, the
output to the headphones is processed by the cross-fading processing unit from the output from
the outside-head sound image localization sound signal storage unit to the head acoustic signal
localization processing on the input sound signal. It switches to the output from the external
sound image localization processing unit.
[0013]
With the above configuration, when listening to an extra-head sound localization headphone, by
first listening to a sound that makes it easy to realize the extra-head sound localization, the
listener can be planted with a sense of out-of-head localization of the sound image. This makes it
possible to quickly and clearly realize the sense of stereotactic localization to the sound being
played.
[0014]
Embodiment 1 A first embodiment of the present invention will be described below with
reference to FIG.
[0015]
FIG. 1 is a block diagram showing a first embodiment of the present invention.
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In FIG. 1, 1 is an input sound signal, 2 is a headphone, 3 is an out-of-head sound image
localization processing unit for performing an out-of-head sound localization process on the
input sound signal 1, and 4 is an out-of-head area in which an out-of-head sound localization
sound signal is stored. The sound image localization sound signal storage unit 5a, 5b switches
the cross fade processing unit for switching the output to the headphone 2 between the output
from the overhead sound image localization processing unit 3 and the output from the overhead
sound image localization sound signal storage unit 4 Show.
[0016]
When the listener listens to the outside sound image localization headphones, first, the cross fade
processing units 5a and 5b connect the output to the headphone 2 with the output from the
outside sound image localization sound signal storage unit 4, and the outside sound image
localization sound A signal is output to the headphones 2.
When the listener realizes the sense of localization outside the head of the sound image, the
output of the headphone 2 is switched from the output of the out-of-head sound localization
sound signal storage unit 4 to the output from the out-of-head sound localization processing unit
3. Listening to the result of the out-of-head sound localization processing.
[0017]
Here, an example of the out-of-head sound image localization sound signal stored in the out-ofhead sound image localization sound signal storage unit 4 will be described.
[0018]
Out-of-head sound image localization sound signal storage unit 4 stores in advance sound signals
that define a plurality of sound image positions around the listener as out-of-head sound image
localization sound signals.
[0019]
As this acoustic signal, a signal recorded with a dummy head or a signal obtained by subjecting
an acoustic signal that is likely to be localized to an out-of-head sound image to an out-of-head
acoustic image localization process is used.
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[0020]
Then, the sound image position is output so as to move around the listener.
Here, as a method of movement, it is effective to rotate or reciprocate around the listener.
[0021]
When the listener realizes the sense of localization outside the head of the sound image, the
output of the headphone 2 is switched from the output of the out-of-head sound localization
sound signal storage unit 4 to the output from the out-of-head sound localization processing unit
3. Listening to the result of the out-of-head sound localization processing.
[0022]
The switching of the outputs in the cross fade processing units 5a and 5b may be switched like a
simple switch, or may be switched while fading in and out the two sets of outputs.
[0023]
As described above, according to the present embodiment, when the listener listens to the
outside sound image localization headphone, the outside sound image stored in advance before
listening to the result of performing the outside sound image localization processing on the input
sound signal By listening to a sound that makes it easy to feel the localization, the listener can
quickly and clearly locate the out-of-head sound image compared to the case where the result of
performing the out-of-head sound image localization processing on the input sound signal from
the beginning It becomes possible to make
[0024]
Embodiment 2 A second embodiment of the present invention will be described with reference to
FIG.
FIG. 2 is a block diagram showing a second embodiment of the present invention, in which a
direction detection unit 6 for detecting the direction of the listener is added to the block diagram
of FIG.
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[0025]
In the present embodiment, acoustic signals for defining a plurality of sound image positions
around the listener are stored in advance in the out-of-head sound localization sound signal
storage unit 4 as the out-of-head sound localization sound signal.
[0026]
Then, when the listener listens to the outside sound image localization headphones, the direction
detection unit 6 first detects the direction of the listener.
Further, the cross fade processing units 5 a and 5 b connect the output to the headphone 2 with
the output from the out-of-head sound localization sound signal storage unit 4, and the out-ofhead sound localization sound signal is output to the headphone 2.
[0027]
At this time, the sound signal output to the headphone 2 corresponds to the direction of the
listener detected by the direction detection unit 6 among the sound signals for each sound image
position stored in the out-of-head sound image localization sound signal storage unit 4 Are
selected dynamically.
[0028]
When the listener realizes the sense of localization outside the head of the sound image, the
output of the headphone 2 is switched from the output of the out-of-head sound localization
sound signal storage unit 4 to the output from the out-of-head sound localization processing unit
3. Listening to the result of the out-of-head sound localization processing.
At this time, when listening to the external sound image localization headphone with respect to
the input sound signal 1, a listening method of dynamically changing the sound image position
using the direction detection unit 6 is also possible.
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[0029]
As described above, according to the present embodiment, in addition to the effects of the first
embodiment, the listener can experience a change in the position of the sound image interlocking
with the movement of the user, so that the sound localization outside the head is clear quickly
and clearly. It becomes possible to realize
[0030]
(Third Embodiment) The third embodiment of the present invention will be described below with
reference to FIG.
FIG. 3 is a block diagram showing a third embodiment of the present invention.
[0031]
In FIG. 3, 1 is an input acoustic signal, 2 is a headphone, 7 is an acoustic signal storage unit in
which an acoustic signal easy to localize to an outside sound image is stored, and 3 is an acoustic
signal stored in the input acoustic signal 1 and the acoustic signal storage unit 7 The out-of-head
sound image localization processing unit that performs the out-of-head sound image localization
processing on the signal, 5a and 5b switches the input to the out-of-head sound image
localization processing unit 3 between the input sound signal 1 and the output from the sound
signal storage unit 7 The cross fade process part is shown.
[0032]
When the listener listens to the outside sound image localization headphones, first, the cross fade
processing units 5a and 5b connect the input of the outside sound image localization processing
unit 3 and the output of the sound signal storage unit 7 to the sound signal storage unit 7 The
result of performing the outside sound image localization processing on the stored outside sound
image localization easy sound signal is output to the headphone 2.
[0033]
When the listener feels the sense of localization outside the head of the sound image, the listener
switches the input to the out-of-head sound image localization processing unit 3 from the sound
signal stored in the sound signal storage unit 7 to the input sound signal 1. Listening to the result
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of the external sound image localization processing.
As an acoustic signal stored in the acoustic signal storage unit 7, one including a wide range of
frequency components, such as music using a white noise or a musical instrument with a
complex tone, is preferable because it easily localizes an out-of-head sound image.
[0034]
Here, an example of a method for allowing a listener to listen to a result of performing an out-ofhead sound image localization process on an acoustic signal stored in the acoustic signal storage
unit 7 will be described.
When the listener is made to listen to the result of performing the out-of-head sound image
localization processing on the sound signal stored in the sound signal storage unit 7, the sound
image position is output so as to move around the listener.
As a method of movement, it is effective to rotate or reciprocate around the listener.
When the listener realizes the sense of external localization of the sound image, the output of the
acoustic signal storage unit 7 is switched from the output of the acoustic signal storage unit 7 to
the input acoustic signal 1, and the external acoustic image localization process is performed on
the input acoustic signal 1. Listen to the results you did.
[0035]
As described above, according to the present embodiment, when the listener listens to the
outside sound image localization headphone, the outside sound image stored in advance before
listening to the result of performing the outside sound image localization processing on the input
sound signal By listening to the result of performing the out-of-head sound image localization
processing on an acoustic signal that makes it easy to feel the localization, compared to the case
where the result of performing out-of-head sound image localization processing on the input
acoustic signal from the beginning It is possible to make listeners realize the localization of the
out-of-head sound image quickly and clearly.
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[0036]
Fourth Embodiment A fourth embodiment of the present invention will be described with
reference to FIG.
FIG. 4 is a block diagram showing a fourth embodiment of the present invention, in which a
direction detection unit 6 for detecting the direction of the listener is added to FIG.
[0037]
When the listener listens to the outside sound image localization headphones, the direction
detection unit 6 first detects the direction of the listener.
Further, the crossfade processing units 5a and 5b connect the input of the out-of-head sound
image localization processing unit 3 and the output of the sound signal storage unit 7, and the
head for the sound signal easy to localize outside sound image stored in the sound signal storage
unit 7 The result of the external sound image localization processing is output to the headphone
2.
[0038]
At this time, the out-of-head sound image localization processing unit 3 performs out-of-head
localization at a sound image position corresponding to the direction of the listener detected by
the direction detection unit 6.
As a result, an acoustic signal having a sound image position corresponding to the direction of
the listener is output to the headphone 2.
[0039]
When the listener realizes the sense of external localization of the sound image, the output of the
acoustic signal storage unit 7 is switched from the output of the acoustic signal storage unit 7 to
the input acoustic signal 1, and the external acoustic image localization process is performed on
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the input acoustic signal 1. Listen to the results you did.
[0040]
At this time, when listening to the external sound image localization headphone with respect to
the input acoustic signal 1, a listening method of dynamically changing the sound image position
using the direction detection unit 6 is also possible.
[0041]
As described above, according to this embodiment, the same effect as that of the second
embodiment can be obtained.
[0042]
As described below, according to the present invention, an out-of-head sound image localization
acoustic signal storage unit storing an out-of-head sound localization sound signal and an out-ofhead sound image localization processing for performing out-of-head sound image localization
processing on input sound signals. In an out-of-head sound localization headphone listening
apparatus including a cross fade processing unit that switches the output from the out-of-head
sound localization sound signal storage unit and the output from the out-of-head sound
localization processing unit, the listener is an out-of-head sound image When listening to
localized headphones, the external sound image localization processing is usually performed on
the input sound signal from the beginning by listening to the external sound image localization
sound signal stored in the external sound image localization sound signal storage unit. As
compared with the case where the result is heard, it is possible to make the listener feel the
localization of the out-of-head sound image quickly and clearly.
[0043]
Brief description of the drawings
[0044]
1 is a block diagram showing the first embodiment of the present invention
[0045]
2 is a block diagram showing the second embodiment of the present invention
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[0046]
3 is a block diagram showing the third embodiment of the present invention
[0047]
4 is a block diagram showing the fourth embodiment of the present invention
[0048]
Fig. 5: Principle explanatory view of sound localization outside the head
[0049]
Explanation of sign
[0050]
DESCRIPTION OF SYMBOLS 1 input acoustic signal 2 headphone 3 extra-head sound image
localization processing part 4 extra-head sound image localization sound signal storage part 5a,
5b cross fade processing part 6 direction detection part 7 acoustic signal storage part 8a, 8b
headphone speaker
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