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JPH0970100

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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
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DESCRIPTION JPH0970100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound field control apparatus capable of realizing a stereoscopic sound effect rich in presence in
a personal space even under a noise environment.
[0002]
2. Description of the Related Art In recent years, as image reproduction technology has been
improved and more virtual reproduction is required, sound field reproduction (stereophonic
sound effect) well matched to video is desired. For example, many game sound signals that have
been recorded so as to obtain a three-dimensional sound effect when speakers are arranged in
stereo are also on the market. In addition, when the above-described recording is not performed,
a sound field control device is realized which realizes a three-dimensional sound effect by
processing an output signal in real time.
[0003]
Hereinafter, a conventional sound field control apparatus for realizing a three-dimensional sound
effect by performing signal processing in real time will be described using the drawings.
[0004]
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1
FIG. 11 is a conceptual view of a conventional sound field control device.
In FIG. 11, 1 is a television main body, 2 is a reproduction speaker disposed on both sides of the
television main body 1, 3a to 3d are signal processed by sound image control means (not shown),
L created by the reproduction speaker 2 It is a virtual sound source of R, SL, SR. Also, 4 is a
listener, 5 is a chair on which the listener 4 sits.
[0005]
Hereinafter, the operation of the above-described sound field control device will be described.
When the listener 4 sitting on the chair 5 listens to the sound wave emitted from the
reproduction speaker 2, the reproduction sound field becomes a reproduction sound field with
less sense of presence like the area A in FIG. At this time, if sound wave control is performed so
that sound waves emitted from the reproduction speaker 2 are subjected to signal processing by
sound image control means (not shown) and localized as a virtual sound source at the positions
3a to 3d, The place will be expanded as in Area B, and it will be realistic (for example, "DSP sound
system in AV personal computer" P 246-249, Tamura et al., AES Tokyo Convention '95
preliminary collection).
[0006]
However, when the above-mentioned sound field control device is installed in a noisy
environment, the reproduction speaker is far from the listener, so the output level is higher than
that of the direct sound like the surround component. Low sound is masked by noise, and there is
a problem that it is difficult to obtain a sufficient three-dimensional sound effect at the listening
position.
[0007]
In addition, when the above-mentioned sound field control device is arranged adjacently, the
surround component of the own seat is masked by the reproduction sound of the other seat, so
that a sufficient three-dimensional sound effect can be obtained at the listening position. Will
increase the playback level of
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2
However, in this case, since the surround component of the other seat is masked by the
reproduction sound of the own seat, the reproduction level of the other seat is similarly
increased. As a result, when a plurality of the sound field control devices are installed, the entire
reproduction level can not but be increased, and the power consumption is increased.
[0008]
The present invention has been made in view of such conventional problems, and it is an object
of the present invention to provide a sound field control device capable of realizing a sufficient
three-dimensional sound effect with power saving even in a noisy environment. It is a thing.
[0009]
SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to
claim 1 of the present application is a method in which a speaker for emitting sound waves
radiates sound waves directly to a listener. The present invention is characterized in that
reproduction speakers are installed at the left and right hand positions of the above.
[0010]
The invention according to claim 2 of the present application is a sound field control apparatus
comprising sound image control means for localizing a sound image at an arbitrary position, and
a reproduction speaker for emitting an output signal of the sound image control means as a
sound wave. The present invention is characterized in that the reproduction speakers are
installed at the right and left hand positions of a chair on which the listener sits, so that the
reproduction speakers directly emit sound waves to the listener.
[0011]
In the invention according to claim 3 of the present application, the sound image control means
has at least one or more input terminals and two output terminals, and is configured by one or
more sets of FIR filters, and is set. An arbitrary set of FIR filter coefficients is based on a headrelated transfer function from a set of the reproduction speakers to both ears of the listener, and
head-related transmission from a sound source located at any position to both ears of the listener
It is characterized in that it is set to match the function.
[0012]
According to the present invention having such characteristics, a sufficient three-dimensional
sound effect can be obtained with power saving even in a noisy environment.
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3
[0013]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sound field control apparatus
according to a first embodiment of the present invention will be described below with reference
to the drawings.
[0014]
FIG. 1 is a block diagram showing the configuration of the sound field control apparatus
according to the first embodiment.
FIG. 2 is a perspective view of a chair with a speaker installed at the hand position, used in the
first embodiment.
[0015]
In FIG. 1, 4 is a listener, 5 is a chair on which the listener sits, and 6a and 6b are reproduction
speakers, which are respectively installed on the left and right armrests of the chair 5.
7 is a sound source.
Further, in FIG. 2, one full-range type speaker is used for each of the reproduction speakers 6a
and 6b installed at hand.
[0016]
The operation of the sound field control device configured as described above will be described.
When the output signal of the sound source 7 is radiated from the reproduction speakers 6a and
6b installed in the chair 5 on which the listener 4 sits, the listener 4 can listen at an equal
distance from the reproduction speakers 6a and 6b. In the case where the stereo sound effect is
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obtained in advance during conventional stereo reproduction, it is possible to obtain substantially
the same 3D sound effect as in the case where the speaker is installed beside the television main
body described in the conventional example. .
[0017]
By the way, although the example which arrange | positions a speaker in the ear tip (headrest
part) in such a sound field control apparatus is disclosed by Unexamined-Japanese-Patent No. 537994, the case where a speaker is arrange | positioned at the ear tip The difference in the case
of arranging in the following will be described.
[0018]
Assuming that the head is at an equal distance from the left and right speakers as a reference
point (initial state), the impulse response generated in the left ear by the reproduction speakers
6a and 6b at this time is L, and the impulse response generated similarly in the right ear Assume
R.
[0019]
Next, when it deviates from the reference point, the impulse response generated in the left ear by
the reproduction speakers 6a and 6b is L ', and the impulse response generated in the right ear is
R'. When evaluating using the evaluation function P,
[0020]
Represented by:
In the above (Equation 1), n is actually nT, which is a natural number that is an integral multiple
of the sampling period T, and indicates that the signal L (n) is a function of discrete time.
The same applies to (Expression 2) to (Expression 6) shown later.
Since there is no movement from the reference point, P = 0.
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[0021]
Here, when the listener 4 moves his head while sitting on a chair 5 on which a speaker at hand is
installed, a case is considered where a change occurs in the state of stereo reproduction.
[0022]
Assuming that the impulse response generated in the left ear is L'a and the impulse response
generated in the right ear is R'a in the first embodiment of the present invention, the sum Pa of
square errors when shifted from the reference point in the front and rear, right and left
directions Becomes a curve as shown by the thin line in FIG.
ただし、
[0023]
FIG. 5 shows the relationship between the error P and the deviation of the head from the
reference point in the front-rear and left-right directions.
The error P is plotted on the vertical axis.
[0024]
FIG. 12 is a perspective view of the embodiment disclosed in the above-mentioned Japanese
Patent Application Laid-Open No. 5-3794.
In FIG. 12, reference numerals 11a and 11b denote reproduction speakers installed at the ear.
The sum of squared errors when the impulse response generated in the left ear is L'b and the
impulse response generated in the right ear is R'b from the loudspeaker arranged in the ear like
this Pb is a curve as shown by the thick line in FIG. ただし、
[0025]
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From FIG. 5, the error when the head is shifted in the front and rear direction is almost equal
between the hand speaker and the ear speaker, but the error when the head is shifted in the left
and right direction is P is smaller. That is, the value of the sum of square errors is smaller in the
case of installing the speaker at hand than in the case of installing the speaker at the ear, and the
state of stereo reproduction is maintained even if the head is moved a little. It can be said that
the area is also suitable for practical use.
[0026]
FIG. 13 shows a chair in which the reproduction speaker is installed at the position of the elbow
when the listener sits down. In FIG. 13, the sound wave emitted directly from the reproduction
speaker does not reach the listener's ear, but the reflected sound reflected by the chair or
reflected from other parts enters the listener's ear. For this reason, the effect of the reproduction
speaker arranged in this way is such that the sound is wrapped around "Numbilical Shimoda",
and the sound field is somewhat blurred as a whole. However, in the present embodiment, since
the sound waves emitted from the reproduction speaker are placed at places where they reach
the listener's ears directly, it is possible to provide a good three-dimensional sound effect without
blurring.
[0027]
In addition, although the case where one full range type speaker was respectively used for the
reproduction | regeneration speaker installed in the chair of the sound field control apparatus of
a present Example was demonstrated, the speakers 8a and 8b for medium-low-range
reproduction | regeneration as shown in FIG. Even when the high-frequency reproduction
speakers 9a and 9b are installed at hand and the shape of the speaker boxes 10a and 10b in
which the respective speakers are installed is arbitrary, the sound waves are directly transmitted
to the listener from the respective reproduction speakers The same effect can be obtained if it is
installed to be radiated. It goes without saying that similar effects can be obtained even when the
shape of the reproduction speakers 11a and 11b themselves is arbitrary as shown in FIG.
[0028]
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7
Hereinafter, a sound field control apparatus according to a second embodiment of the present
invention will be described with reference to the drawings. FIG. 6 is a block diagram showing the
configuration of a sound field control apparatus according to a second embodiment of the
present invention.
[0029]
In FIG. 6, 4 is a listener, 5 is a chair on which the listener sits, and 6a and 6b are reproduction
speakers, which are respectively installed on the left and right armrests of the chair 5. A sound
source 7 has 5 ch output terminals. Reference numeral 12 denotes sound image control means
having a 5-ch input terminal capable of localizing a sound source in an arbitrary direction.
[0030]
The operation of the sound field control device configured as described above will be described.
First, the output signal of the sound source 7 is input to the sound image control means 12. At
this time, the process of signal processing in the sound image control means 12 will be described
with reference to FIG. FIG. 7 is a block diagram of a circuit that performs signal processing in the
sound image control means 12. In FIG. 7, 13a, 13b, and 14a, 14b, and 15a, 15b, and 16a, 16b,
and 17a, 17b are respectively two FIR filters, and 18a, 18b are output signals of the respective
FIR filters. Is an adder that adds
[0031]
The 5ch signals output from the sound source 7 are input to the Lch, Rch, Cch, SLch, and SRch
input terminals of the sound image control means 12, respectively. Then, the Lch input signal is
subjected to signal processing by the FIR filters 13a and 13b whose filter coefficients are set so
that the virtual sound image is localized at the position of the speaker L in FIG. 8, and thereby
reproduced by the reproduction speakers 6a and 6b. At this time, the listener can listen to the
Lch signal as if a virtual sound image was localized at the position of the speaker L. A signal
processing method of sound field control for producing such a virtual sound image can be easily
realized by a well-known known technique, and the description thereof will be omitted. The same
applies to Rch, Cch, SLch, and SRch. Thus, the sound image control means 12 similarly places the
Rch signal at the position of the speaker R in FIG. 8, the Cch signal at the speaker C position, and
the SLch signal at the speaker SL position, the SRch signal. Since the virtual sound source can be
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8
localized at the position of the speaker SR, the listener can obtain a three-dimensional sound
effect only with the 2ch speaker installed at hand.
[0032]
By the way, although the example which arrange | positions the speaker in the ear (headrest
part) in the sound field control apparatus is disclosed by Unexamined-Japanese-Patent No. 537994, when arranging a speaker in the ear, it arranges at hand like this invention. The
differences between the cases are explained below.
[0033]
When a sound image is localized at an arbitrary position using an FIR filter, if the target impulse
response matches the impulse response (implementation characteristic) generated at the ear base
using the FIR filter, the target characteristics The sound image is localized at the position.
[0034]
Therefore, in the present embodiment, the degree of realization (the deviation from the target
impulse response) is evaluated as the evaluation function Q in the case where the speaker is
installed at the ear and in the case where the speaker is installed at hand. explain.
[0035]
When the head is at an equal distance from the left and right speakers as a reference point
(initial state), the impulse response generated in the left ear by the target speaker (not shown) at
this time is L, and the impulse generated in the right ear as well Let R be the response.
[0036]
Next, let L 'be the impulse response generated in the left ear when the sound wave is emitted
from the reproduction speaker using the FIR filter, and R' be the impulse response generated in
the right ear. When evaluating using Q,
[0037]
Represented by
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Since there is no movement from the reference point, Q = 0.
[0038]
Here, when the listener 4 moves his / her head while sitting on a chair 5 on which a speaker at
hand is installed, a case is considered where a change occurs in the state of stereo reproduction.
[0039]
Using the FIR filter according to the second embodiment of the present invention, the impulse
response generated in the left ear when the sound wave is emitted from the reproduction
speaker is L'a, and the impulse response generated in the right ear is R'a. The total sum Qa of
square errors when shifted from the point in the front-rear and left-right directions is a curve as
shown by a thin line in FIG.
ただし、
[0040]
FIG. 9 shows the relationship between the error Q and the deviation of the head from the
reference point in the front-rear and left-right directions.
The error Q is plotted on the vertical axis.
[0041]
FIG. 12 is a perspective view of the embodiment disclosed in the above-mentioned Japanese
Patent Application Laid-Open No. 5-37994.
In FIG. 12, reference numerals 11a and 11b denote reproduction speakers installed at the ear.
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When L'b represents the impulse response generated in the left ear when the speaker arranged
at the earpiece emits a sound wave through the FIR filter, and R'b represents the impulse
response generated in the right ear, the front and back, right and left from the reference point
The sum total Qb of square errors when shifted in the direction is a curve as shown by a thick
line in FIG.
ただし、
[0042]
According to FIG. 7, the error when the head is shifted in the front and rear direction is almost
equal between the hand speaker and the ear speaker, but the error when the head is shifted in
the left and right direction is Q is smaller. That is, even when the FIR filter is used, the sum of
square errors is smaller in the case where the speaker is installed at hand compared with the
case where the speaker is installed in the ear, and even if the head is moved slightly, the service
area Is widely suitable for practical use.
[0043]
Although in the present embodiment the sound image control means is constituted by the FIR
filter, the same effect can be obtained even if it is constituted not only by this but also by any
circuit used for normal sound image control such as a delay unit and a gain adjuster. Be
[0044]
Moreover, although the output channel of the sound source 7 is 5ch in this embodiment, the
number of channels is not limited to this and may be an arbitrary number of channels.
[0045]
Furthermore, although the number of input channels of the sound image control means 12 is
5ch, any number of channels may be used. For example, as shown in FIG. 10 (“DSP sound
system in AV personal computer” Tamura et al., AES Tokyo convention '95 preliminary
collection p 247 Fig. 3 The same effect can be obtained by configuring the circuit as shown in 2.).
[0046]
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11
As described above, according to the sound field control apparatus of the present invention,
sufficient three-dimensional sound field effect can be realized in a wide service area with power
saving without taking a complicated configuration even in a noisy environment. It is possible to
provide a sound field control device that can do it.
[0047]
Brief description of the drawings
[0048]
1 is a block diagram showing the configuration of the sound field control apparatus in the first
embodiment of the present invention
[0049]
2 is a perspective view of a chair with a speaker installed at the hand position used in the first
embodiment of the present invention
[0050]
3 is a perspective view of a chair with a speaker installed at the hand position according to
another embodiment of the present invention.
[0051]
4 is a perspective view of a chair with a speaker installed at the hand position according to
another embodiment of the present invention.
[0052]
5 shows the relationship between the movement of the head and the sum of square errors in the
first embodiment of the present invention.
[0053]
6 is a block diagram showing the configuration of the sound field control apparatus according to
the second embodiment of the present invention.
[0054]
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7 is a block diagram of the sound image control means in the second embodiment of the present
invention
[0055]
Fig. 8 A conceptual view of the stereophonic sound effect by the sound field control apparatus in
the second embodiment of the present invention
[0056]
FIG. 9 is a diagram showing the relationship between the movement of the head and the sum of
square errors in the second embodiment of the present invention.
[0057]
10 is a block diagram of the sound image control means in another embodiment of the present
invention
[0058]
Fig. 11 A conceptual diagram of stereophonic sound effect by the conventional sound field
control device
[0059]
Fig. 12 A perspective view of a chair with a speaker installed at the ear position used in the
conventional sound field control device
[0060]
Fig. 13 A perspective view of a chair with a speaker installed at the elbow position used in the
conventional sound field control device
[0061]
Explanation of sign
[0062]
DESCRIPTION OF SYMBOLS 1 TV main body 2 reproduction | regeneration speaker 3a-3d virtual
sound source 4 listener 5 seat 6a, 6b reproduction | regeneration speaker 7a, 7b reproduction |
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regeneration speaker 8a, 8b low-mid range reproduction | regeneration speaker 9a, 9b highfrequency reproduction | regeneration speaker 10a, 10b speaker box 11a, 11b reproduction |
regeneration Speaker 12 sound image control means 13a, 13b FIR filter 14a, 14b FIR filter 15a,
15b FIR filter 16a, 16b FIR filter 17a, 17b FIR filter
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