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JP2012227647

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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
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DESCRIPTION JP2012227647
To reproduce three-dimensional multi-channel sound in an indoor sound environment. A space
sound reproduction system (10) comprises a plurality of space arrangement speakers (30-1-30N) spatially distributed in a room sound environment to reproduce a three-dimensional multichannel sound signal; In order to reproduce a binaural reproduction acoustic signal that is
converted based on a multi-channel acoustic signal, both of a plurality of listening positions are
made up of a plurality of speakers disposed at predetermined positions near the listener's ears.
The binaural reproduction acoustic signal for the three-dimensional multi-channel acoustic signal
so that the phase of the reproduction sound reproduced by a plurality of spatial arrangement
speakers and the reproduction sound reproduced by a plurality of spatial arrangement speakers
coincide with each other. In addition to adjusting the time difference, a bino with pseudo
reverberation corresponding to the reverberation of the three-dimensional multi-channel acoustic
signal for each listening position And a spatial sound reproduction apparatus 20 to generate an
acoustic signal for Le playback. [Selected figure] Figure 1
Spatial sound reproduction system by multi-channel sound
[0001]
The present invention relates to a technique for presenting sound by a speaker in an indoor
acoustic space, and more particularly to a spatial sound reproduction system by multi-channel
sound.
[0002]
In a conventional multi-channel sound system-based sound reproduction apparatus, a plurality of
sound signals are reproduced individually by the same number or a larger number of speakers,
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and the time axis is aligned, from a plurality of directions with respect to the listener. To achieve
the desired sound impression to the listener.
[0003]
When sound reproduction is performed by a plurality of speakers indoors, generally, the same
signal (reference signal for adjustment) is input at the central position (reference listening
position) of the assumed listening area, and the sound pressure from each speaker is Adjust the
gain of the amplifier driving the speakers to be equal.
[0004]
Further, at the reference listening position, the frequency characteristic correction process is
inserted in the front stage of the amplifier so as to adjust so that the frequency characteristics of
the sound coming from each speaker become as uniform as possible.
Furthermore, in order to match the time for the sound from each speaker to reach the reference
listening position, a delay process for the acoustic signal is inserted in the former stage of the
amplifier with respect to the speaker whose arrival time is earlier with reference to the speaker
having the latest arrival time. The time difference is adjusted by the delay process.
[0005]
However, in an actual indoor acoustic space, in addition to the direct sound arriving from the
speaker most quickly to the reference listening position, there is a reflected sound (indirect
sound) that is reflected on the indoor wall surface and delayed.
This reflected sound often degrades the desired acoustic impression to be presented to the
listener.
Therefore, generally, in order to reduce the reflected sound, architectural acoustic design using a
building material that reduces the reflectance of the sound by the indoor wall surface is
performed to solve this problem.
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[0006]
On the other hand, as a space sound reproduction system by multi-channel sound provided in
theaters such as movie theaters, a technology of three-dimensional sound reproduction in which
an excellent sound image localization effect can be obtained anywhere by providing speakers in
individual chairs Are known (see, for example, Patent Document 1).
[0007]
JP 2001-25086 A
[0008]
The dome theater typified by the planetarium has a perfect circular shape so that all positions on
the wall (screen) projecting the image are equidistant from the reference listening position in
order to perform ideal image presentation. It is common to be taken.
The result of actually acquiring an acoustic signal in such a dome-shaped room acoustic
environment is shown in FIG.
In FIG. 9, the direct sound is detected about 50 ms after the start of the reproduction of the
acoustic signal, and about 50 ms after the direct sound, a unique acoustic signal in the domeshaped room acoustic environment (hereinafter, It can be seen that the "specific sound" is
detected. Such anomalous sounds are not desirable reproduced sounds for the listener. Thus, as
shown in FIG. 9, depending on the relative relationship between the position of the speaker
placed at a distance from the listening position in the dome theater space and the listening
position in the listening area, the direct sound that arrives first from the speaker is delayed The
amplitude of the incoming reflected sound, that is, the sound pressure level may become large,
and in such a sound reproduction situation, it becomes extremely difficult to listen to the original
sound signal with high quality.
[0009]
In other words, space for presenting spatial acoustic quality equivalent to that of conventional
multi-channel sound under poor room acoustic conditions such as dome theaters (that is,
environmental conditions that produce a unique sound that occurs 20 ms or more behind direct
sound) A sound reproduction system is desired.
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[0010]
Also, as disclosed in Patent Document 1, an acoustic reproduction device for arranging a speaker
near a passenger seat or enhancing the clarity of voice by a plurality of speakers has been
developed until now, but three-dimensional A system for reproducing the acoustic space with
high quality has not been developed.
[0011]
In particular, making the wall into an elliptical or perfect circular shape can not be avoided for
the purpose of video presentation in the dome theater.
Another feature of the dome theater is to make the entire wall a screen.
The screen is required to be as smooth as possible in order to improve the quality of the
projected image, which will increase the reflectivity for sound. Therefore, it is difficult to use
architectural acoustic means to solve the problem.
[0012]
Therefore, in order to reduce the influence of the dome-shaped wall as much as possible, it is
considered that arranging the speaker as close as possible to the listener is the most effective
measure. However, the reproduction sound from the speakers arranged in the vicinity of the
listener and the acoustic impression by the speakers arranged at a considerable distance from
the listener are different, and furthermore, to realize three-dimensional sound reproduction by
the plurality of speakers which is the original purpose Since it is not easy to use a speaker
arranged in the vicinity of the listening position, further devising is necessary.
[0013]
Therefore, even if multi-channel sound reproduction by arranging a plurality of speakers in the
dome-like hole is performed by the conventional adjustment method, it often becomes an
acoustic impression far from a desired spatial impression.
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[0014]
The present invention has been made in view of the above problems, and is under inferior room
acoustic conditions such as dome theaters (ie room acoustic conditions in which a specific sound
is generated with a delay of 20 ms or more from a direct sound). Another object of the present
invention is to provide a spatial sound reproduction system by multi-channel sound with
excellent sound image localization.
[0015]
In the space sound reproduction system of the present invention, the position where the
reproduction sound of three-dimensional sound presented from a plurality of speakers arranged
at a remote position from the listening position in the conventional manner and the binaural
reproduction acoustic signal approximated to this three-dimensional sound are listened The
playback sounds played by multiple speakers placed in the vicinity were spatially mixed.
Moreover, since the amplitude of the specific sound generated at a delay of 20 ms or more from
the direct sound and the timing of the generated time differ depending on the seat position, the
spatial mixing can be individually and arbitrarily changed depending on the seat.
[0016]
The spatial acoustic reproduction system of the present invention is a spatial acoustic
reproduction system that reproduces three-dimensional multi-channel sound in a room acoustic
environment, and spatially reproduces the three-dimensional multi-channel acoustic signal in the
room acoustic environment. In order to reproduce a plurality of spatially arranged speakers
distributed and a binaural reproduction acoustic signal converted by binaural processing based
on the three-dimensional multi-channel acoustic signal, listening is performed for each of a
plurality of listening positions in the room acoustic environment Speakers arranged in the
vicinity of the user's ears, the speakers arranged near the ears, the reproduction sounds
reproduced by the plurality of spatially arranged speakers, and the speakers arranged near the
both ears Sound signal for binaural reproduction with respect to the three-dimensional multichannel sound signal so that the phase of the reproduced sound matches A spatial sound
reproducing device for adjusting the time difference and generating the binaural reproduction
sound signal to which pseudo reverberation sound corresponding to the reverberation sound of
the three-dimensional multi-channel sound signal is added for each listening position; Do.
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[0017]
Further, in the space sound reproduction system of the present invention, the indoor sound
environment is a space environment in which a peculiar sound is generated in which
reproduction sounds reproduced by the plurality of space arranged speakers are generated 20
ms or more behind direct sound. I assume.
[0018]
Further, in the spatial sound reproduction system of the present invention, in order to reproduce
an acoustic signal obtained by multiplexing and synthesizing the three-dimensional multi-channel
acoustic signal, each of the listening positions is disposed at a predetermined position as a front
position of a listener. A listening position forward arrangement speaker is further provided.
[0019]
According to the present invention, for example, even in an inferior room acoustic environment
such as a dome theater where high quality space acoustic reproduction is difficult with the prior
art, acoustic content created by, for example, a three-dimensional multi-channel acoustic
production system is desired. It will be able to reproduce with the spatial acoustic quality of.
[0020]
It is a schematic block diagram of the space sound reproduction system of one embodiment by
the present invention.
It is a figure which shows the example of arrangement | positioning of the multi-channel space
arrangement | positioning speaker and the both-ears arrangement | positioning speaker in the
space sound reproduction system of 1st Embodiment by this invention.
(A), (B) is a figure which shows the example of arrangement | positioning of the both-ears
arrangement | positioning speaker in the space sound reproduction system of 1st Embodiment
by this invention.
It is a block diagram of the sound reproduction apparatus in the space sound reproduction
system of 1st Embodiment by this invention.
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It is a figure which shows an example measured about the acoustic signal in the space sound
reproduction system of 1st Embodiment by this invention.
(A), (B) is a figure which shows the example of arrangement | positioning of the both-ears
arrangement | positioning speaker in the space sound reproduction system of 2nd Embodiment
by this invention. It is a block diagram of the sound reproduction apparatus in the space sound
reproduction system of 2nd Embodiment by this invention. It is a figure which shows an example
measured about the acoustic signal in the space sound reproduction system of 2nd Embodiment
by this invention. It is a figure which shows an example which measured the acoustic signal in
the dome-shaped indoor acoustic environment based on the conventional multi-channel acoustic
system.
[0021]
First, with reference to FIGS. 1 to 4, a space sound reproduction system 10 according to a first
embodiment of the present invention will be described. FIG. 1 is a schematic block diagram of a
space sound reproduction system according to an embodiment of the present invention. FIG. 2 is
a view showing an arrangement example of the multi-channel space arrangement speaker and
the both-ears arrangement speaker in the space acoustic reproduction system of the first
embodiment according to the present invention. FIG. 3 is a view showing an arrangement
example of the both-ears arranged speaker in the space acoustic reproduction system according
to the first embodiment of the present invention. FIG. 4 is a block diagram of a sound
reproduction device in the space sound reproduction system of the first embodiment according
to the present invention.
[0022]
First Embodiment Referring to FIG. 1, it is assumed that the room acoustic environment of the
dome-shaped hole H (ie, a space environment in which a peculiar sound occurs with a delay of
20 ms or more from a direct sound). The dome-shaped hole H in FIG. 1 is merely an example, but
in the dome-shaped hole H, a peculiar sound as shown in FIG. 9 is generally generated.
[0023]
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In the space sound reproduction system 10 of the present embodiment, the N channels of the
spatially arranged speakers 30-1, 30-2, 30-3, ..., 30-N reproduce sound content for a threedimensional multi-channel sound signal. For this purpose, they are spatially dispersed in the
room acoustic environment, and are provided, for example, on the wall surface of the domeshaped hole H or in the vicinity of the wall surface. The arrangement position of the space
arrangement speaker 30-N may be forward arrangement, rear arrangement or peripheral
arrangement to the listener of each seat S, and the arrangement position of the space
arrangement speaker 30-N itself is the present invention It is not a subject. For example, the
sound pressure from each space arrangement | positioning speaker 30-N can be arrange |
positioned so that it may become equivalent in the center position (reference | standard listening
position) of the listening area assumed.
[0024]
Each seat S is provided with two left and right second speakers that generate binaural
reproduction sound whose volume is adjusted for each listening position in the vicinity of the
listener's ears (hereinafter referred to as “both ears near arrangement It is called "speaker". For
example, assuming that the distance between both ears is 0.15 m, it is preferable to install the
near-ear-range arranged speaker 40 on the seat S within 0.15 m of the previously assumed ear
position.
[0025]
As shown in FIGS. 1 and 2, in the present embodiment, the sound reproduction device 20
includes N channels of spatially arranged speakers 30-1, 30-2, 30-3,. This is a device for
controlling the phase and sound pressure level of the reproduced sound from the both-ears
arranged speaker 40 composed of the two left and right second speakers provided to S. The
sound reproduction device 20 can be configured by a computer and can be realized by control of
a central processing unit (CPU) or the like. That is, the CPU can appropriately read the program
in which the processing content for realizing the function of each component is described from a
predetermined storage unit, and can realize the function of each component on the computer.
[0026]
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8
FIG. 3A is a cross-sectional view of the seat S as viewed from the side, and the both-ears arranged
speaker 40 is arranged at a position of a predetermined sitting height h. FIG. 3B is a rear view of
the seat S as viewed from the rear, and the distance w between the left and right two second
speakers may be set to be about 0.15 m to 0.30 m.
[0027]
As shown in FIG. 4, the sound reproducing apparatus 20 according to this embodiment includes
an N-channel sound signal reproduction storage unit 201, an sound signal reproduction control
unit 202, a listening position table storage unit 203, and a listening position time difference by
channel. The control unit 204 includes a pseudo reverberation generation and addition unit 205,
a binaural processing unit 206, and volume control units 207 and 208.
[0028]
The storage unit 201 for N-channel acoustic signal reproduction stores acoustic content for a
three-dimensional multi-channel acoustic signal reproduced in the room acoustic environment of
the dome-shaped hole H.
Such acoustic content is, for example, created by a producer using a three-dimensional multichannel acoustic production system, and may not be specialized to the room acoustic
environment of the dome-like hole H, but may be arbitrary.
[0029]
The acoustic signal reproduction control unit 202 generates an acoustic signal to be reproduced
for the N channel spatial arrangement speaker 30 -N with respect to the acoustic content stored
or recorded in the N channel acoustic signal reproduction storage unit 201.
[0030]
The listening position face sheet storage unit 203 stores information of position coordinates of
each seat S.
This position table may be of any type as long as it can specify the distance and direction from
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each of the N channels of the spatially arranged speakers 30 -N to each seat S.
[0031]
The channel-by-channel listening position time difference control unit 204 controls the position
coordinates of each seat S stored in the listening position table storage unit 203 for the audio
signal of each channel reproduced by the audio signal reproduction control unit 202 (that is,
each listening The time difference of the arrival time of the reproduced sound at each listening
position is controlled on a channel-by-channel basis based on the information of the coordinates
of the position). In this time difference control, the delay amount is measured in advance for
audio content stored or recorded in the storage unit 201 for reproducing N-channel audio
signals, and the delay adjustment is performed in accordance with the reproduction time by the
audio signal reproduction control unit 202.
[0032]
The pseudo-reverberation sound generation addition unit 205 generates pseudo-reverberation
sound using the N channel sound signals of which the time difference of the arrival time of the
reproduction sound at each listening position is controlled for each channel as the direct sound.
Add Although any reverberation generation algorithm can be adopted, for example, as shown in
FIG. 9, reverberation that exponentially decreases the sound pressure level is added to the sound
signal of each channel.
[0033]
The binaural processing unit 206 inputs the acoustic signal of each channel to which the
reverberation is added, and converts it into a binaural reproduction acoustic signal using a
known head-related transfer function. The binaural processing unit 206 multiplexes and
synthesizes the acoustic signal of each channel to which the reverberation is added as an
acoustic signal for the both-ears arranged speaker 40 including two left and right second
speakers.
[0034]
The volume adjustment unit 207 adjusts the volume (sound pressure level) of the sound signal of
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each channel from the sound signal reproduction control unit 202, and generates an N-channel
sound signal for the N-channel space arrangement speaker 30-N.
[0035]
The sound volume adjustment unit 208 adjusts the sound volume (sound pressure level) of the
sound signal for the both-ears arrangement speaker 40 from the binaural processing unit 206,
and generates the sound signal for the both-ears arrangement speaker 40.
[0036]
A more specific example will be described for the space sound reproduction system 10 of the
present embodiment.
[0037]
In the space sound reproduction system 10 according to the present embodiment, in addition to
the space arranged speakers 30 -N arranged relatively far from the conventional listener, the
both ears of each listener In the vicinity, a near-ear speaker 40 which is a second speaker is
disposed.
The binaural speaker 40 is composed of two speakers arranged in the vicinity of the listener's
head left and right ears, and the head of a three-dimensional sound signal reproduced by the
speaker spatially arranged in various directions like the spatially arranged speaker 30-N. It is
converted into an acoustic signal for binaural reproduction and reproduced using a partial
transfer function.
The three-dimensional acoustic signal input to binaural signal conversion by such head transfer
function is a plurality of acoustic signals having three-dimensional sound information created by
the three-dimensional acoustic production system used by the creator of the acoustic content. be
able to.
[0038]
(Sound Reproduction Device) In the space sound reproduction system 10 shown in FIG. 1, the
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space arrangement speaker 30 -N (only one is shown as the space arrangement speaker 30 -N in
FIG. 2, but a certain distance from the listening position is necessary A plurality of N speakers,
which are required to reproduce the direction of arrival of the sound, are arranged in the space.
Near-aural speakers 40 are installed for each seat S so that a spatial impression similar to the
three-dimensional sound reproduced by the N-channel spatial arrangement speakers 30 -N
intended by the producer of the acoustic content can be obtained. Ru.
[0039]
What is important here is that, first, the reproduced sound reproduced by the both-ears speaker
40 installed in each seat S rather than the reproduced sound arriving from the N channel spatial
arrangement speaker 30 -N to the position of each seat S Is to be presented to the listener earlier
in time. For this reason, if this time relationship is not matched, the spatial impression of the
sound will be different. Therefore, the distance from each space arrangement speaker 30 -N to
the said listening position is actually measured in the listening position for every seat S, and it
stores in the listening position coordinate storage part 203 in advance as information of a
listening position coordinate.
[0040]
The sound reproducing apparatus 20 delays the sound signal of N channels by the arrival time of
sound calculated from the distance from each space arrangement speaker 30 -N to the listening
position and the sound speed by the channel-specific listening position time difference control
unit 204, The time (that is, the phase) of the reproduction sound of the space arrangement
speaker 30 -N and the both-ears vicinity speaker 40 is matched with each other.
[0041]
Further, since the reproduction sound reproduced from the space arrangement speaker 30-N is a
reproduction sound having a certain echo, to which the rear reverberation sound (see FIG. 9) due
to the room shape of the dome shaped hole H is added. The sound reproduction device 20
actually measures the rear reverberation characteristic at each seat S in order to reproduce this
feeling of reverberation in the same manner with the near-aural speaker 40 by the pseudo
reverberation generation and addition unit 205, and this actual measurement is performed. A
pseudo reverberation sound equivalent to the rear reverberation characteristic is generated and
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added to the three-dimensional acoustic signal of each channel.
A pseudo reverberation pattern equivalent to the measured rear reverberation characteristic may
be stored in a storage unit (not shown) and sequentially read out.
[0042]
The sound reproducing apparatus 20 performs binaural processing based on the head-related
transfer function by the binaural processing unit 206 on the three-dimensional sound signal of
each channel to which the pseudo reverberation is added as described above, and the volume
adjustment unit 208 After the sound volume adjustment, an acoustic signal to be reproduced by
the near-ear speaker 40 is generated.
[0043]
To further elaborate on the spatial impression reproduced by the near-ear speaker 40, the signal
generated by the binaural processing unit 206 is for each listening in the actual domed hole H
listening area (area where the seat S is provided) Depending on the relative positional
relationship between the position and each of the spatially arranged speakers 30 -N, the acoustic
space impression (especially the sense of direction of sound) may differ depending on the
listening position.
In this case, the spatial impression that is actually reproduced by the near-ear speakers 40 has to
be changed according to the change by the listening position. Therefore, it is preferable to
estimate the coordinates (xi, yi, zi) of each listening position by actual measurement, assuming a
polar coordinate space of each listening position centered on the central position (reference
listening position) of the listening area to be assumed. By storing this coordinate data in the
listening position coordinate storage unit 203 as information on the listening position
coordinates, the channel-by-channel listening position time difference control unit 204 enables
the spatially arranged speakers 30 -N of the respective channels and the near-ear speakers 40.
The spatial impression (direction of arrival of sound) of the reproduced sound to be reproduced
can be matched.
[0044]
The volume adjusters 207 and 208 adjust the output levels of the respective speakers so that a
desired three-dimensional acoustic space impression can be obtained in the process of
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reproducing with the spatially arranged speakers 30 -N and the both-ear speakers 40
respectively. .
[0045]
FIG. 5 shows an example of measurement of an acoustic signal in the spatial acoustic
reproduction system of the embodiment.
As apparent from comparison with FIG. 9, it can be seen that the singular point is reduced.
[0046]
As described above, according to the present embodiment, for example, in a three-dimensional
multi-channel sound production system, even in a poor room sound environment such as a dome
theater where high quality space sound reproduction is difficult in the prior art. The created
acoustic content can be reproduced with desired spatial acoustic quality.
[0047]
Next, with reference to FIGS. 1, 6 and 7, a space sound reproduction system 10 according to a
second embodiment of the present invention will be described.
Similar components are denoted by the same reference numerals. FIG. 6 is a view showing an
arrangement example of the both-ears arranged speaker in the space acoustic reproduction
system of the second embodiment according to the present invention. FIG. 7 is a block diagram
of a sound reproducing apparatus in a space sound reproducing system according to a second
embodiment of the present invention.
[0048]
Second Embodiment Also in the present embodiment, it is assumed that the room acoustic
environment of the dome-shaped hole H as shown in FIG. 1 (ie, the space environment where a
peculiar sound occurs with a delay of 20 ms or more from the direct sound). .
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[0049]
In the space acoustic reproduction system 10 of the second embodiment, as in the first
embodiment, the N channels of the spatially arranged speakers 30-1, 30-2, 30-3,..., 30-N are
dome shaped holes. It is provided on or near the wall of H.
The arrangement position of the space arrangement speaker 30 -N can be set to the front
arrangement, the rear arrangement, or the periphery arrangement to the listener of each seat S.
For example, the sound pressure from each speaker can be arranged to be equal at the central
position (reference listening position) of the assumed listening area.
[0050]
Further, in the space sound reproduction system 10 of the second embodiment, as in the first
embodiment, each seat S has binaural reproduction sound whose volume is adjusted for each
listening position in the vicinity of the listener's ears. The both-ears arrangement | positioning
speaker which is two left and right 2nd speakers to generate is provided.
[0051]
However, in the space acoustic reproduction system 10 of the second embodiment, as shown in
FIG. 6, the third embodiment is provided in that the third speaker (hereinafter referred to as
“listening position forward speaker”) is provided in front of the listening position. It is different
from.
[0052]
Therefore, the sound reproduction device 20 according to the present embodiment includes the
N-channel spatial arrangement speakers 30 -N, the binaural arrangement speakers 40 including
the two left and right second speakers provided in each seat S, and the listening position front
speaker The system is configured as a device that controls the phase and sound pressure level of
the reproduced sound from F.50.
The sound reproducing apparatus 20 of the present embodiment can also be configured by a
computer, and can be realized by control of a central processing unit (CPU) or the like.
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That is, the CPU can appropriately read the program in which the processing content for
realizing the function of each component is described from a predetermined storage unit, and
can realize the function of each component on the computer.
[0053]
FIG. 6A is a cross-sectional view of the seat S as viewed from the side, the both-ears arranged
speaker 40 is arranged at a position of a predetermined sitting height h, and the listening
position front speaker 50 is predetermined. It is disposed at the position of the seat height h2
(h2 ≦ h). FIG. 6B is a rear view of the seat S as viewed from the rear, and the distance w between
the left and right two second speakers may be set to be about 0.15 m to 0.30 m, and the listening
position It is preferable from the viewpoint of volume balance that the front speakers 50 be
disposed at the center (w1 = w2 = w / 2) of the respective speakers in the both-ears arranged
speaker 40. Although the both-ears arranged speaker 40 may be configured by a plurality of
speakers, it will be described as one speaker in the following description.
[0054]
As shown in FIG. 7, the sound reproducing apparatus 20 according to this embodiment includes
an N-channel sound signal reproduction storage unit 201, an sound signal reproduction control
unit 202, a listening position table storage unit 203, and a listening position time difference by
channel. The second embodiment is the same as the first embodiment in that the control unit
204, the pseudo reverberation generation and addition unit 205, the binaural processing unit
206, and the volume adjustment units 207 and 208 are the same as the first embodiment, and
the description thereof will be omitted.
[0055]
The sound reproduction device 20 in the present embodiment further includes a pseudo
reverberation generation and addition unit 210, a channel multiplex processing unit 211, and a
volume adjustment unit 212.
[0056]
The pseudo-reverberation sound generation addition unit 210 generates pseudo-reverberation
sound using the N channel sound signals of which the time difference of the arrival time of the
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reproduced sound at each listening position is controlled for each channel as the direct sound.
Add
Although any reverberation generation algorithm can be adopted, for example, as shown in FIG.
9, reverberation that exponentially decreases the sound pressure level is added to the sound
signal of each channel.
[0057]
The channel multiplexing processing unit 211 inputs the acoustic signal of each channel to
which the reverberation is added by the pseudo reverberation generating and adding unit 210,
and multiplexes and synthesizes it as an acoustic signal for the listening position forward speaker
50.
[0058]
The sound volume adjustment unit 212 adjusts the sound volume (sound pressure level) of the
sound signal for the listening position front speaker 50 from the channel multiplex processing
unit 211, and generates the sound signal for the listening position front speaker 50.
[0059]
A more specific example will be described for the space sound reproduction system of the
present embodiment.
[0060]
(Listening Position Forward Speaker) In the space acoustic reproduction system 10 of the
present embodiment, in addition to the space arranged speakers 30 -N arranged at a relatively
long distance to the conventional listener, the vicinity of the both ears of each listener The
second speaker in the vicinity of both ears, the speaker 40, and the listening position front
speaker 50 are disposed.
The binaural speaker 40 is composed of two speakers arranged in the vicinity of the listener's
head left and right ears, and the head of a three-dimensional sound signal reproduced by the
speaker spatially arranged in various directions like the spatially arranged speaker 30-N. It is
converted into an acoustic signal for binaural reproduction and reproduced using a partial
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transfer function.
The three-dimensional acoustic signal input to binaural signal conversion by such head transfer
function is a plurality of acoustic signals having three-dimensional sound information created by
the three-dimensional acoustic production system used by the creator of the acoustic content. be
able to.
Further, in the listening position front speaker 50, an acoustic signal multiplexed and synthesized
with respect to a three-dimensional acoustic signal reproduced by a speaker spatially arranged in
various directions like the spatially arranged speaker 30-N is reproduced.
[0061]
The binaural speaker 40 converts a three-dimensional sound signal reproduced by a speaker
spatially arranged in various directions like the space arranged speaker 30-N into a binaural
reproduction acoustic signal by using a head transfer function and reproduces it. However, there
is known a problem that the sound image in front of the listener is localized in the head and the
sound to be heard from the front is hard to be heard from the front only by binaural
reproduction by the head related transfer function.
In order to solve this problem, the listening position front speaker 50 improves the threedimensional acoustic impression as compared with the reproduction by only the both-ears
vicinity speaker 40 by additionally reproducing the sound to be heard from the front of the
listener. be able to.
[0062]
(Sound Reproduction Device) Also in this embodiment, the both-ears vicinity speaker 40 installed
in each seat S and the listening position ahead of the reproduction sound arriving from the Nchannel space arrangement speaker 30 -N to the position of each seat S The reproduction sound
reproduced by the speaker 50 is presented to the listener earlier in time. For this reason, if this
time relationship is not matched, the spatial impression of the sound will be different. Therefore,
the distance from each space arrangement speaker 30 -N to the said listening position is actually
measured in the listening position for every seat S, and it stores in the listening position
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coordinate storage part 203 in advance as information of a listening position coordinate.
[0063]
The sound reproducing apparatus 20 delays the sound signal of N channels by the arrival time of
sound calculated from the distance from each space arrangement speaker 30 -N to the listening
position and the sound speed by the channel-specific listening position time difference control
unit 204, The time (that is, the phase) of the reproduction sound of the space arrangement
speaker 30 -N and the both-ears vicinity speaker 40 and the listening position front speaker 50
is matched each time.
[0064]
Further, the reproduction sound reproduced from the space arrangement speaker 30-N is a
reproduction sound having a certain reverberation added with the rear reverberation sound (see
FIG. 9) due to the room shape of the dome shaped hole H. The sound reproducing apparatus 20
has the rear reverberation characteristic at the position of each seat S in order to reproduce this
feeling of reverberation by the pseudo reverberation generation and addition unit 205 and 210
similarly with the near-ear speakers 40 and the listening position front speakers 50. Is actually
generated, and a pseudo reverberation sound equivalent to the actually measured rear
reverberation characteristic is generated and added to the three-dimensional acoustic signal of
each channel.
A pseudo reverberation pattern equivalent to the measured rear reverberation characteristic may
be stored in a storage unit (not shown) and sequentially read out.
[0065]
The sound reproducing apparatus 20 generates an acoustic signal adapted to each speaker by
the binaural processing unit 206 and the channel multiplex processing unit 211 with respect to
the three-dimensional acoustic signal of each channel to which the pseudo reverberation is added
as described above. After adjusting the sound volume by the sound volume adjustment units 208
and 212, respectively, an acoustic signal to be reproduced by the near-ear speaker 40 and the
listening position front speaker 50 is generated.
[0066]
Each listening position and each listening position (area where the seat S is provided) of the
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actual dome shaped hole H will be described in more detail regarding the spatial impression
reproduced by both the near-ear speaker 40 and the listening position front speaker 50.
Depending on the relative positional relationship with the spatial arrangement speaker 30-N, the
channel-by-channel listening position time difference control unit 204 controls the spatial
arrangement speaker 30-of each channel so that the acoustic space impression (especially the
sense of direction of sound) becomes the same The spatial impression (direction of arrival of
sound) of the reproduced sound reproduced by N and the both-ears vicinity speaker 40 and the
listening position front speaker 50 can be matched.
[0067]
The volume adjusters 207, 208, and 212 are configured to obtain a desired three-dimensional
acoustic space impression in the process of reproducing with the space arrangement speaker 30N, the both-ears near speaker 40, and the listening position front speaker 50, respectively. Adjust
the output level of each speaker.
[0068]
FIG. 8 shows an example of measurement of an acoustic signal in the spatial acoustic
reproduction system of the embodiment.
As apparent from the comparison with FIG. 9, it can be seen that the singularity is reduced, and
the singularity is reduced as in FIG.
[0069]
As described above, according to the present embodiment, for example, in a three-dimensional
multi-channel sound production system, even in a poor room sound environment such as a dome
theater where high quality space sound reproduction is difficult in the prior art. The created
acoustic content can be reproduced with desired spatial acoustic quality.
[0070]
According to the present invention, for example, even in an inferior room acoustic environment
such as a dome theater where high quality space acoustic reproduction is difficult with the prior
art, acoustic content created by, for example, a three-dimensional multi-channel acoustic
production system is desired. It is useful for any application that reproduces a three-dimensional
multi-channel acoustic signal, since it can be reproduced with spatial acoustic quality.
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20
[0071]
DESCRIPTION OF SYMBOLS 10 Space sound reproduction system 20 Sound reproduction
apparatus 30-1, 30-2, 30-3, ..., 30-N N-channel spatial arrangement speaker 40 Both-ears
speaker 50 listening position Forward speaker 201 N-channel sound signal reproduction Storage
unit 202 Sound signal reproduction control unit 203 Listening position table storage unit 204
Channel-specific listening position time difference control unit 205, 210 Pseudo-reverberation
sound generation addition unit 206 Binaural processing unit 207, 208, 212 Volume adjustment
unit 211 Channel multiplex processing unit
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