close

Вход

Забыли?

вход по аккаунту

JPH03214896

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 JPH03214896
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic signal reproduction apparatus for reproducing an acoustic signal by a headphone
device. SUMMARY OF THE INVENTION The present invention is an acoustic signal reproduction
apparatus for reproducing an acoustic signal by a headphone device, wherein reference signals
for position detection transmitted from a reference signal source are disposed at two places on
the head of a listener The relative distance and the rotation angle of the head with respect to the
reference signal source are calculated by the arithmetic means based on the output signals of the
signal detectors, and are optionally detected using the reference signal source as a reference
position. A system capable of performing appropriate binaural reproduction for a virtual sound
source by obtaining the transfer characteristic for the virtual sound source to be located from the
information of the relative distance and the rotation angle, and processing an acoustic signal
based on the transfer characteristic. Is. C. Prior Art Conventionally, as in a headphone device that
reproduces an acoustic signal by a headphone unit, a pair of headphones unisoto supported in
the vicinity of the binaural by being worn on a listener's head is used. A pinaural method is
known as a method for improving the sense of direction of the sound image, localization outside
the head, and the like when reproducing an acoustic signal. The sound reproduction system
adopting this pinaural method performs predetermined signal processing on the sound signal
reproduced by the headphone device in advance as described in, for example, Japanese Patent
Publication No. 53-2f33. . Here, the sense of direction of the sound image, the sense of
localization outside the head, etc. are determined by the volume difference, time difference,
phase difference, etc. of the sounds heard by the left and right ears. The above-mentioned signal
processing means, for example, when sound reproduction is performed by a loudspeaker
apparatus arranged at a distance from the listener, the distance from the sound source, ie, the
loudspeaker I to the listener's left and right ears is different and the listener's head is It is signal
10-05-2019
1
processing that causes an acoustic effect equal to the acoustic effect generated by reflection or
diffraction in the vicinity of a part to occur in the acoustic output reproduced by the headphone
device. Such signal processing is performed by, for example, a process of convoluting and
integrating an impulse response corresponding to the above-described acoustic effect into
acoustic signals for the left ear and for the right ear. By the way, when sound reproduction is
performed by the Sveica device arranged apart from the listener, even if the listener moves or
rotates the direction of the head, the absolute position of the sound image does not change, so
the listener The relative direction and position of the perceived sound image changes. To this,. In
the case of performing sound reproduction in a pinaural method using a headphone device, when
the listener rotates the direction of the head, the Hendhon device is also rotated along with the
head, so the relative direction of the sound image felt by the listener and The position does not
change.
As described above, when performing pinaural reproduction using a headphone device, a sound
field is formed in the head of the listener due to the difference in the displacement state of the
sound image with respect to the change in direction of the head of the listener. It is difficult to
localize in front of the listener, and the sound image in front of it tends to rise. Therefore, as
described in JP-A-42-227 and JP-B-54-19242, a change in the direction of the head of the
listener is detected, and the above signal processing is performed based on the detection result.
An acoustic signal reproduction system has been proposed in which a good forward localization
is obtained in a headphone device by changing the state. In such an acoustic signal reproduction
system, a direction detection device such as a so-called gyro compass or a magnetic needle is
disposed on the head of a listener. Then, based on the detection result by the direction detection
device, the level adjustment circuit for processing the acoustic signal, the delay circuit, and the
like are controlled to be separated from the listener and disposed! It is intended to obtain the
same sound field confusion as the sound reproduction by the above-mentioned Sbi eka device. D
By the way, in a conventional pinaural reproduction system provided with a direction detection
device such as the above-mentioned gyro compass or the like in a headphone set, a signal to be
applied to an acoustic signal according to a change in the head direction of a listener. By
controlling the contents of the process, it is possible to obtain a good sound image localization
feeling as long as the listener is at a constant position. However, when the listener moves, the
sound image also moves as the listener moves, resulting in a very unnatural feeling of sound
image localization. Normally, when the listener approaches a sound source such as a skier device,
the sound pressure level increases. In addition, since the sound source of the skier device or the
like has directivity, the influence of the sameness of the finger also appears by the movement of
the listener, and these give out-of-head localization and feeling. Therefore, in view of the
conventional situation as described above, the present invention performs appropriate pinaural
reproduction in which an extremely natural sound image localization feeling can be obtained
without movement of the virtual sound source position by the hendophone device even when the
listener moves. An object of the present invention is to provide an acoustic signal reproduction
10-05-2019
2
apparatus capable of E. Means for Solving the Problems The acoustic signal reproducing
apparatus according to the present invention comprises a reference signal source for
transmitting a reference signal for position detection, and 2 on the listener's head in order to
achieve the above object. A relative distance between the head and the reference signal source
based on the output signals of the pair of signal detectors disposed at a location and sensing the
reference signal transmitted from the reference signal source; Based on the transfer
characteristic calculated by the calculation means, calculating the rotation angle and obtaining
the transfer characteristic to the virtual sound source arbitrarily positioned with the reference
signal source as the reference position from the information of the relative distance and the
rotation angle And sound signal processing means for respectively processing sound signals of
the left channel and the right channel, and reproducing the sound signal through the sound
signal processing means by the headphone device. .
F Action In the audio signal reproducing apparatus H according to the present invention, the
computing means sends the reference signal source to the reference signal source based on the
output signals of the pair of signal detectors that sense the reference signal for position detection
sent from the reference signal source. Information indicating the transfer characteristic by
calculating the relative distance and the rotational angle of the head, determining the transfer
characteristic with respect to the virtual sound source arbitrarily positioned with the reference
signal source as the reference position from the information of the relative distance and the
rotational angle Is given to the acoustic signal processing means. The acoustic signal processing
means processes the acoustic signals of the left channel and the right channel based on the
transfer characteristics obtained by the computing means, and supplies the acoustic signals
subjected to the signal processing to the pair of headphone devices. G. Embodiment Hereinafter,
one embodiment of the acoustic signal reproduction apparatus 1 according to the present
invention will be described in detail with reference to the drawings. The sound signal
reproducing apparatus according to the present invention, as shown in FIG. 1, is attached to the
head (M) of the listener by the headband (1) and a pair corresponding to the vicinity of the
listener's left and right auricle. And a headphone device (10) adapted to support the headphone
unit (2L) and (2R). In the head band (1) of the headphone device (10), two sliders (4L) with
support arms (3L) and (3R) formed to protrude. (4R) is slidably mounted and is transmitted from
the reference signal 'fA (11)! A pair of signal detectors (SL) that sense reference signals for
detection. (5R) is the support arm (3L). It is provided at the tip of (3R). That is, the pair of signal
detectors (5L) and (5R) is a slider (4L) which is slidably mounted on the hood band (1). The head
band (1) and the pair of headphone units (2L), (2R), ie, the headphone main body, are separated
by being provided at the tip end portions of the support arms (3L) and (3R) which are formed to
project from (4R) The position is supported by the support arms (3L) and (3R). In this
embodiment, the reference signal tA (ll) is an ultrasonic signal fA (12) and an ultrasonic signal
(13) for transmitting an ultrasonic signal from the ultrasonic wave signal source (12) as a
reference signal. And consists of And an ultrasonic microphone is used for a pair of signal
10-05-2019
3
detectors (5L) and (5R) which receive the said reference signal, respectively. As shown in FIG. 2A,
the ultrasonic waves sent from the ultrasonic speaker (13), that is, the reference signal for
position detection, intermittently send ultrasonic waves of a predetermined level every
predetermined time. It is an ultrasonic wave whose phase can be detected, such as a burst wave,
or a so-called level modulation wave whose level is changed at a predetermined cycle.
The pair of signal detectors (5L) and (5R) provided in the headphone device (10) senses a
reference signal for position detection using an ultrasonic wave transmitted from the ultrasonic
wave scaly (13). With a time delay corresponding to the relative positional relationship between
the listener and the ultrasonic wave scaly (13). Each detection signal as shown in B and C of FIG.
2 is output. The above pair of signal detectors (5L). (5R) is provided at the tip of support arms
(3L) and (3R) which are formed to project from the sliders (4L) and (4R) slidably mounted on the
head band (1), and the head With the band (1) and a pair of headphone units (2L), (2R), that is,
with the headphone body mounted on the head of the listener, supported by the support arms
(3L), (3R) at positions separated from the headphone body Therefore, even if the listener moves
or turns his head, the ultrasonic waves transmitted from the ultrasonic sca- ker (l 3) are
extremely well-received without becoming behind the listener's head. It is possible to sense and
stably and accurately detect the reference signal for position detection. Further, the pair of signal
detectors (5L 冫, (5R) are arranged along the head band (1) and the slider (4L). By sliding (4R),
the position can be adjusted to the optimum position for detection of the reference signal for
position detection. For example, the position of the headphone units (2L) and (2R) attached to the
head (1) of the listener by the headband (1) and supported correspondingly in the vicinity of the
listener's left and right ears , Because there are individual differences depending on the shape
and size of the listener's head (M), the above headphone unit (2L). The pair of signal detectors
(5L) to correspond to the position of (2R). Adjust the position of (5R). The detection signals
obtained by these signal detectors (5L) and (5R) are supplied to the arithmetic unit (14). The
arithmetic unit (14) includes each of the signal detectors (SL) of the reference signal for position
detection. The ultrasonic signals from the first and second edge detection circuits (15) and (16)
to which each detection signal according to (SR) is supplied and the ultrasonic signal iff <12),
that is, the reference signal for the position detection A third edge detection circuit (17) is
provided. The first and second edge detection circuits (15). (16) detects each rising edge of each
detection signal by each of the signal detectors (5L, 5R), and each pulse signal as shown in D and
已 in FIG. 2 corresponding to the above rising edge Output.
The pulse signals obtained by the first and second edge detection circuits (15) and (16) are
supplied to the distance calculation circuit (1 day) and the binaural time difference detection
circuit (19). Further, the third edge detection circuit (17) detects a rising edge of the ultrasonic
signal from the ultrasonic signal source (12), as shown in F of FIG. 2 corresponding to the rising
edge. Output pulse signal. The pulse signal obtained by the third edge detection circuit (17) is
10-05-2019
4
supplied to the distance calculation circuit (18). The distance calculation circuit (18) corresponds
to the pulse signal obtained by the third edge detection circuit (17) shown by .DELTA.T1 in FIG. 2
and the pulse signal obtained by the first edge detection circuit (15). The pulse signal obtained
by the third edge detection circuit (17) indicated by .DELTA.T2 in FIG. 2 and the corresponding
pulse signal obtained by the second edge detection circuit (16) The time difference L2 between
the pulses is detected. And each of these time differences L +. Arrows in FIG. 3 based on T-z and
sound velocity V! ! . A distance A between 0 and the center of the ultrasonic wave (13) and the
head of the listener (M)! ! . Calculate The speed of sound may be set in advance in the distance
calculation circuit (18) as a constant, or may be changed in accordance with fluctuations in air
temperature, humidity, air pressure or the like. In calculating the distance Ml, it is based on the
positional relationship between the signal detectors (SL) and (5R) and the center of the head (M),
and the shape and size of the head (piece). You may make corrections. Above distance! . And the
signal which shows each said time difference L + and Lx is sent to the transfer characteristic
calculation circuit (20). The binaural time difference detection circuit (19) corresponds to the
pulse signal of the first edge detection circuit (15) and the pulse signal of the second edge
detection circuit (15) shown by ΔT, in FIG. The time difference t between the pulses is detected.
A signal indicating this time difference is sent to the transfer characteristic calculation circuit
(20). In the transfer characteristic calculation circuit (20), the time differences Ll, L! , Ls, the
above distance ゑ. An angle θ indicating the direction of the head (M) indicated by an arrow θ
in FIG. 3 using the velocity of sound 2 and the radius r of the head (M). Calculate. The above
angle θ. For example, θo #sin − ′ (V (t ++ tz) t3 / 4 r j! It can be determined by 1 ........ (first
type).
And the angle θ indicating the relative positional relationship between the reference position
and the head (M) of the listener, with the position of the ultrasonic wave scaker (13) as the
reference position of the virtual sound source. The relative angle l from the virtual sound source
and the rotation angle θ position of the head of the head (M) relative to the desired virtual
sound source position is calculated from the information of the distance l0 and the directivity of
the desired virtual sound source etc. Find the transfer characteristics considered. The transfer
characteristic information in consideration of the directivity and the like of the virtual sound
source obtained by the transfer characteristic calculation circuit (20) is supplied to the acoustic
signal processing circuit (21). The headphone units (2L) and (2R) receive the left channel and
right channel sound signals SL and S output from the sound signal supply source (22). But from
the acoustic signal processing circuit (21) a pair of amplifiers (23L). (23R) is supplied. The
acoustic signal supply source (22) is a device for outputting predetermined left channel and right
channel acoustic signals SL and SR, and, for example, various recording disk reproducing devices,
recording tape reproducing devices, radio wave receiving devices, etc. Is. The acoustic signal
processing circuit (2l) is for supplying the acoustic signal. It is a circuit that performs
predetermined signal processing on the left channel and right channel acoustic signals SL and S
sent from the source (22), taking into consideration the directivity of the virtual sound source
10-05-2019
5
obtained by the transfer characteristic calculation circuit (20), etc. The first to fourth signal
processing units (24a), (24b), (24c). (24d) is provided. Each of these signal processing units
(24a). (24b). In (24c) and (24d), based on the transfer characteristic information, the left channel
and the right channel are used as virtual sound sources for a pair of speaker devices for the left
channel and the right channel which are installed facing each other at a distance from the
listener. An impulse response representing the transfer characteristic to each ear of the listener
when reproducing the sound signals SL and SR is set. That is, the first signal processing unit
(24a) sets an impulse response {h 1 (1, θ)} representing the transfer characteristic of the right
channel acoustic signal St reproduced to the right ear. The second signal processing unit (24b)
sets an impulse response (h * t (t.θ)} representing the transfer characteristic of the right channel
sound signal S e to the left ear of the reproduced sound? する。 The third signal processing unit
(24c) sets an impulse response (ht * (t.θ)) representing the transmission time to the right ear of
the sound reproduced from the left channel sound signal SL.
The fourth signal processing unit (24d) generates an impulse response (hLL (t, θ) 1 representing
a transfer characteristic of the left channel acoustic signal SL reproduced to the left ear. Each of
these impulse responses is set in advance in accordance with the transfer characteristic in
consideration of the directivity and the like of the virtual sound source, and stored in a memory
device (ROM) or the like. . The read address may be determined and read by the angle .theta. In
the acoustic signal processing circuit (21), the right channel acoustic signal S is sent to the first
and second signal processing units (24a) and (24b). In the first signal processing unit (24a), the
right channel acoustic signal SII is subjected to signal processing based on convolution of the
impulse response {h 2 (1, θ)}. Furthermore, in the second signal processing unit (24b), the right
channel acoustic signal SII is subjected to signal processing based on the convolution integral of
the invalence response (b ++ t (L, θ)). Further, the left channel acoustic signal SL is sent to the
third and fourth signal processing units (24c), (24d). The third signal processing unit (24c)
performs signal processing on the left channel acoustic signal St by convolution of the impulse
response (hL * (t, θ)). Further, in the second signal processing unit (24d), the left channel
acoustic signal S is subjected to signal processing by convolution of the impulse response (hLt (t,
θ)). Then, the output signals of the first signal processing unit (24a) and the third signal
processing unit (24c) are added to each other by the right-side adder (25R). The output signal of
the right side adder (25R) is supplied to the right ear acoustic signal E.V. Finally, it is sent to the
right headphone unit (2R) and played back. Further, the output signals of the second signal
processing unit (24b) and the fourth signal processing unit (24d) are added to each other by the
left-side adder (25L). An output signal of the left side adder (25L) is sent to the left headphone
unit (2L) as a right ear acoustic signal Et via the left amplifier (23L) and reproduced. In the sound
signal reproducing apparatus according to the present invention configured as described above,
with the position of the ultrasonic speaker (13) as the reference position of the virtual sound
source, the reference position and the head of the listener (M) The above-mentioned angle θ
showing the relative positional relationship with And the relative distance 2 from the virtual
10-05-2019
6
sound source and the rotation angle θ position of the head of the head (M) relative to the
desired virtual sound source position from the information of the distance i0 and the directivity
of the desired virtual sound source etc. The considered transfer characteristics are obtained, and
the left and right channel acoustic signals SL and SR are processed in real time based on the
information indicating the transfer characteristics.
Therefore, according to this acoustic signal reproduction apparatus, for example, as shown in A
of FIG. 4, by performing signal processing corresponding to changes in the transfer characteristic
accompanying the movement of the listener and the rotation of the head (M) in real time. , B, and
C, as indicated by the relative positional relationship between the virtual sound source and the
listener, by means of a pair of skier devices (SL), (SR) spaced apart and facing forward to the
listener (P) As in the case of reproducing an acoustic signal, a good sense of out-of-head
localization and forward localization without movement of a virtual sound source can be
obtained. Here, in FIG. 4, the listener (P) has a pair of sliding force devices (SL), (St? In other
words, B indicates a state in which the virtual sound source is located as shown in A with respect
to the virtual sound source, and B indicates a state in which the listener (P) approaches the head
(M) on the right skater device (SR) side. The rotated state is shown in C. In the sound signal
reproducing apparatus according to the present invention, as described above, the virtual sound
source moves by performing the signal processing corresponding to the change of the transfer
characteristic accompanying the movement of the listener and the rotation of the head CM) in
real time. A good sense of out-of-head localization and a sense of forward localization can be
obtained, and pinaural reproduction corresponding to any of A, B and C in FIG. 4 can be
performed. The headphone device (10) used in the sound signal reproducing apparatus of this
embodiment has, as its basic configuration, a headphone (2L). As shown in FIG. 5, one channel of
(2R) is formed by an acoustic pipe (31) formed by the housing of the headphone unit, and a skier
unit (not shown) provided on the inner peripheral surface of the acoustic pipe (31). 32) and The
above-mentioned sound tube (31) has an inner diameter W.D. The inner diameter W is
substantially the same as the diameter. The acoustic tube (31) is formed of a long tubular body
having a uniform inner diameter W, and the auricle mounting portion (33) is provided at the one
end side opening (31a), and the other end side opening (3 lb) is considered as a non-reflection
termination of voice. The auricle attachment portion (33) is thinly formed on the tip end side by a
flexible synthetic resin or the like. The pinna attachment portion (33) is attached by inserting the
tip portion into the entrance portion (C) of the ear canal (^). The inner diameter W of the auricle
attachment portion (33) is the same as the inner diameter W of the acoustic tube (3l), ie,
substantially the same as the inner diameter W0 of the ear canal (A). The sounding surface (32a)
faces the inside of the sound tube (3l) in a state substantially flush with the inner peripheral
surface thereof, and the above-mentioned sci-ka uninoto (32) is attached. By making the sound
emitting surface (32a) and the inner peripheral surface of the acoustic tube (31) substantially
flush, the Sveicak unit} (32) can produce the above-mentioned acoustic without disturbing the
acoustic impedance characteristic of the above-mentioned acoustic tube (31). Attached to the
10-05-2019
7
tube (3 l).
And, with the tip of the auricle attachment portion (33) inserted into the entrance (C) of the
external auditory canal (^) and the acoustic tube (31) attached, the eardrum (B) in the external
ear canal (^) And the other end side opening (3 lb) which is the non-reflection end of the abovementioned acoustic tube (31), the acoustic path becomes a constant sound path by continuing
with a substantially constant inner diameter. . For this reason, the sound output from the skier
unit (32) is not reflected when propagating to the side of the ear canal (^) through the sound
tube (31), and the reflected sound from the eardrum (B) The above-mentioned acoustic tube (31)
{! It is not reflected when propagating to l. Moreover, since the other end side opening (3 lb) of
the above-mentioned sound tube (31) is made a non-reflection end of voice, the sound output
propagated from the above-mentioned skier unit (32) to the above-mentioned sound tube (3 l)
And the reflected sound transmitted from the side of the external ear canal (^) is not reflected by
the other end side opening (3 lb). Therefore, the reflection sound from the upper eardrum (B) is
not reflected by the speaker unit (32) side and is not propagated again to the ear canal (^) side,
so that a front out-of-head localization feeling by pinaural reproduction is obtained. be able to. H
As described above, in the sound signal reproducing apparatus according to the present
invention, based on the output signals of the pair of signal detectors that sense the reference
signal for position detection sent from the reference signal source by the computing means. The
transfer characteristic for any virtual sound source can be obtained from the distance and
rotation angle of the head with respect to the reference position of the virtual sound source by
the reference signal source. Then, the acoustic signal processing means processes the acoustic
signals of the left channel and the right channel respectively based on the transfer characteristic
calculated by the arithmetic means, and the acoustic signal having the signal processing is
supplied to the headphone device. It is possible to perform appropriate pinaural reproduction
that can obtain an extremely natural sound image localization feeling without movement of the
virtual sound source position even when moving.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram schematically showing the configuration of an acoustic signal
reproduction apparatus according to the present invention, and FIG. 2 is a time chart
schematically showing the state of signals supplied to the arithmetic unit of the acoustic signal
reproduction apparatus, 3 is a schematic view showing the distance and angle calculated by the
10-05-2019
8
arithmetic unit of the acoustic signal reproduction apparatus, and FIG. 4 is the relative between
the virtual sound source and the listener for explaining the operation of pinaural reproduction by
the acoustic signal reproduction apparatus. FIG. 5 is a cross-sectional view of an essential part of
one channel showing the basic configuration of the above-mentioned headphone device used in
the above-mentioned sound signal reproducing apparatus.
(2L). (2R)・・・・・・ヘッドホンユニット(5L). (SR)... Signal detector (10)...
(21) Acoustic signal processing circuit Patent applicant Sony Corporation
10-05-2019
9
1/--страниц
Пожаловаться на содержимое документа