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JP2005184140

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DESCRIPTION JP2005184140
PROBLEM TO BE SOLVED: To provide a three-dimensional sound recording method, a threedimensional sound reproduction method, and an apparatus capable of presenting a sound image
of a place closer to the listener than the position of the actually arranged speaker and compatible
with the conventional three-dimensional sound reproduction method. . SOLUTION: A threedimensional sound reproducing apparatus 11 reproduces a near signal that reproduces a sound
image at a short distance within a preset range set from a position of a listener at the time of
playback and a far sound image outside of the preset range. Stereophonic sound which
reproduces a stereophonic sound by inputting the recorded stereo sound or the audio signal of
each channel which becomes surround sound as a far signal to be output to a plurality of
directional speakers having different directivity characteristics. The reproduction apparatus 11
includes an input / output unit 13 and a speaker system 17. [Selected figure] Figure 3
Three-dimensional sound recording method, three-dimensional sound reproduction method,
three-dimensional sound reproduction apparatus
[0001]
The present invention relates to a three-dimensional sound recording method for recording an
audio signal forming a three-dimensional sound, a three-dimensional sound reproducing method
for reproducing, and a three-dimensional sound reproducing apparatus.
[0002]
Conventionally, as a method of causing a listener to feel a sound having a three-dimensional
effect from input audio signals of a plurality of channels, as a so-called stereophonic sound
reproduction method, for example, (1) 2-channel headphone reproduction method, (2) 2-speaker
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reproduction method, There are (3) multi-speaker reproduction system and (4) perspective
control system (refer to patent document 1).
[0003]
(1) The two-channel headphone reproduction method is to input an R audio signal and an L audio
signal to a two-channel (RL) headphone worn by a listener and reproduce it.
(2) In the two-speaker reproduction method, the R audio signal and the L audio signal are input
to and reproduced from each of two speakers arranged in the left and right front direction from
the position of the listener.
[0004]
(1) and (2) are standard stereo systems (two-channel stereo). In this stereo system, the sound is
usually localized between the speakers by providing a level difference or time difference between
the channels. It is a system.
In addition, this stereo system may be extended to a system in which the sound pressure at the
entrance of the ear canal of the listener is controlled by a filter simulating a head-related transfer
function and the output sound is localized in an arbitrary direction.
[0005]
(3) The multi-speaker reproduction system is generally called a 5-channel stereo (surround
system) because it is composed of five speakers, and is disposed on the two speakers of the twospeaker reproduction system almost in front of the listener A center speaker and two surround
speakers arranged in the left and right rear direction of the listener are added, and an R audio
signal, an L audio signal, a C audio signal, an SR audio signal, and an SL audio signal are added to
each of them. To play.
[0006]
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(4) The perspective control method (see Patent Document 1) is a direct sound obtained by
directly picking up a sound emitted from a sound source using a speaker array (directional
speaker) or a radiation pattern of a plurality of speakers Based on (dry source), the indirect
sound to which the sound emitted from the sound source reflects is determined, the ratio of the
direct sound to the indirect sound is controlled, and the distance of the sound image is
synthesized. The sound image can be presented at a location closer to the listener than the
position of the speaker.
JP-A-9-121400 (paragraphs 0022 to 0030, FIG. 1)
[0007]
However, in the conventional three-dimensional sound reproduction methods (1) to (3), the sense
of distance of sound can be obtained by giving a sound component (for example, reflection
sound, reverberation sound) to the sound signal which is the original signal of the sound.
Although control was performed, there is a limit to control of the sense of distance of the sound
only by adjustment of the sound component (quantity), and the problem that the sound image of
a place closer to the listener than the position of the actually arranged speakers can not be
presented There is.
[0008]
Also, in the conventional stereophonic sound reproduction method (4), it is possible to present a
sound image of a place closer to the listener than the position of the actually arranged
loudspeakers, but There is a problem that there is no compatibility with (1) to (3).
That is, in the perspective control method which is the conventional stereophonic sound
reproduction method (4), since the sound signal is based on direct sound (dry source) containing
no indirect sound, the sound signal may be a normal stereo method or In order to perform
reproduction with a reproduction apparatus compatible with the surround system, it is necessary
to process an audio signal using a reverberation adding apparatus and a mixing apparatus.
[0009]
Therefore, in the present invention, a three-dimensional sound recording method compatible
with the conventional three-dimensional sound reproduction method, which can solve the abovementioned problems and can present a sound image of a place closer to the listener than the
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position of the actually arranged speakers. It is another object of the present invention to provide
a three-dimensional sound reproduction method and a three-dimensional sound reproduction
device.
[0010]
In order to solve the above-mentioned problem, according to the stereophonic sound recording
method of claim 1, when reproducing an audio signal of each channel to be stereophonic sound
or surround sound, the stereophonic sound recording method is set in a preset range from the
position of the listener. A stereophonic sound recording method for recording in a recording
device as a near signal reproducing a certain short distance sound image and a far signal
reproducing a long distance sound image outside the setting range, the near signal / far signal
recording step; The procedure included
[0011]
According to this procedure, the stereophonic sound recording method causes the recording
device to record the audio signal as the near signal and the far signal in the near signal / far
signal recording step.
The near signal (sound signal for short distance) is a sound signal that makes the sound source
feel at a position within a certain range from the position of the listener assumed in advance.
Conversely, the far signal (sound signal for far distance) is a sound signal that causes the sound
source to be felt at a position outside a predetermined range from the position of the listener
assumed in advance. The sense of distance of sound can be felt by the level difference between
the near signal and the far signal.
[0012]
In this stereophonic sound recording method, the sound signal is recorded as a near signal and a
far signal by some method, for example, a method of branching the sound signal to a preset ratio
for reproducing a desired sense of distance is cited. Be In this method, audio signals input to each
channel, which are reproduced as stereo sound or surround sound, are branched into two based
on a preset ratio. For each channel, one audio signal is used as two audio signals. Also, this ratio
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is for adjusting the sense of distance between sounds, such as sounds heard from near, sounds
heard from far, etc. (feeling the distance between the listener and the sound source from the
sound heard by the listener), for example, If you want the sense of distance of the sound to be
close to the listener (if you want to localize near), the ratio of the audio signal localized at a short
distance from the listener than the ratio of the audio signal localized at a long distance increase.
[0013]
Furthermore, in the three-dimensional sound recording method, when collecting (picking up) an
audio signal, near-signal collecting means installed at a position preset from the sound source of
the audio signal for each channel (assuming a short distance from the listener) And the far signal
collecting means installed at a position preset from the sound source (foreseeing a long distance
from the listener) for each channel are arranged substantially on the same line from the listener,
and the near signal collecting means and the far signal collecting means There is also a method
of acquiring the sound collected by the signal collection means as the near signal and the far
signal of the same channel. The near signal collecting means and the far signal collecting means
may be, for example, microphones, and the microphones may not be substantially colinear (not
completely straight. It may have a certain width), and the sound collected by the microphone
within a preset distance from the listener is near-signal, and is collected by the microphone
outside the preset distance from the sound source The acquired sound is acquired as a far signal,
and the acquired near signal and far signal are recorded on a recording device.
[0014]
The stereophonic sound reproduction method according to claim 2 reproduces a near signal for
reproducing a sound image at a short distance within a preset range from the position of the
listener at the time of playback and a far-field sound image outside the preset range. 3D sound
reproduction that reproduces 3D sound by inputting recorded stereo sound or sound signal of
each channel to be surround sound as a far signal to be output to a speaker system consisting of
a plurality of directional speakers having different directivity characteristics The method is a
procedure including an output step.
[0015]
According to this procedure, the three-dimensional sound reproduction method outputs the near
signal and the far signal to each of the directional speakers constituting the speaker system in
the output step.
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The directional speaker of this speaker system has different directional characteristics, and
includes a near signal directional speaker that outputs a near signal and a far signal directional
speaker that outputs a far signal. In addition, the speaker system is, for example, composed of a
plurality of directional speakers arranged at different positions, and the output sound is different
in the arrival direction from which the listener arrives, and the sound causing various senses of
direction is It will be output (sound images located in various directions and distances will be
reproduced). In this stereophonic sound reproducing method, a device that outputs a near signal
and a far signal is specified as a speaker system that does not need to delay the near signal and
the far signal when inputting the signal into each speaker.
[0016]
The stereophonic sound reproduction method according to claim 3 reproduces a near signal for
reproducing a sound image at a short distance within a preset range from the position of the
listener at the time of playback and a far-field sound image outside the preset range. Stereo
sound reproduction method for reproducing stereo sound by inputting recorded stereo sound or
sound signal of each channel to be surround sound as a far signal to be reproduced, into a
speaker array, comprising near signal and far signal delay The procedure includes steps and an
output step.
[0017]
According to this procedure, the three-dimensional sound reproduction method delays each of
the near signal and the far signal in the near signal / far signal delay step by a preset time, and in
the output step, delays the delayed near signal and the delayed far signal. The signal is output to
the speaker array.
The speaker array is composed of a plurality of speaker units provided substantially in the same
plane, and from the center of the plane (the center of the array) to locally increase the sound
pressure near a certain point (focus) in space Of the input audio signals, a delay amount
corresponding to the difference between the path to the focal point and the path from each
speaker unit to the focal point is given to the near signal, and the sound image is localized near
(in the vicinity of the focal point) This delay amount can be driven by a given delayed voice signal
(delayed near signal). In addition, the speaker array can add a delay amount such that no focus is
generated to the far signal in the sound signal, and can localize the sound image far (far), and the
delay sound signal (the delay amount is given ( Drive by the delayed far signal).
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[0018]
By using this speaker array, it is possible to give the listener an impression as if the sound image
is localized near the focal point and there is a sound source at that position (focal point).
Moreover, this three-dimensional sound reproduction method specifies a device that outputs a
near signal and a far signal as a speaker array that delays and outputs the near signal and the far
signal.
[0019]
The stereophonic sound reproducing apparatus according to claim 4 reproduces a near signal for
reproducing a sound image at a short distance within a preset range from the position of the
listener at the time of playback and a far-field sound image outside the preset range. 3D sound
reproduction that reproduces 3D sound by inputting recorded stereo sound or sound signal of
each channel to be surround sound as a far signal to be output to a speaker system consisting of
a plurality of directional speakers having different directivity characteristics The apparatus is
configured to include the speaker system and an output unit.
[0020]
According to this configuration, the three-dimensional sound reproducing apparatus outputs the
near signal and the far signal to the respective directional speakers constituting the speaker
system by the output means.
Since the speaker system is composed of a plurality of directional speakers having different
directional characteristics, it is possible to experience three-dimensional sound having various
senses of distance from various directions.
[0021]
The stereophonic sound reproducing apparatus according to claim 5 reproduces a near signal
which reproduces a sound image of a short distance within a preset range from the position of
the listener at the time of playback, and a far-field sound image which is outside the preset range.
A stereophonic sound reproducing apparatus for reproducing stereophonic sound by inputting,
to a speaker array, audio signals of respective channels to be recorded as stereo sound or
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surround sound as a far signal, A signal delay unit, a far signal delay unit, and an output unit are
provided.
[0022]
According to this configuration, the three-dimensional sound reproducing apparatus outputs the
delayed near signal delayed by the near signal delay unit and the delayed far signal delayed by
the far signal delay unit to the speaker array by the output unit.
With this speaker array, it is possible to experience a three-dimensional sound having a sound
image localized near the focal point and far signal near the focal point.
[0023]
According to the first aspect of the present invention, the audio signal is recorded as a near
signal and a far signal in order to reproduce a desired sense of distance. If the near signal and the
far signal are output from a speaker system or a speaker array configured by a plurality of
directional speakers having different directivity characteristics, the speakers actually arranged
while maintaining compatibility with the conventional three-dimensional sound reproduction
method. It is also possible to present a sound image of a place closer to the listener than the
position of.
[0024]
According to the invention as set forth in the second and fourth aspects, the near signal and the
far signal constituting the audio signal are outputted to each of the directional speakers of the
speaker system to maintain compatibility with the conventional three-dimensional sound
reproduction system. The near signal can be presented near the listener and the far signal can be
presented far from the listener, so that the listener can experience the three-dimensional sound
with a three-dimensional effect.
[0025]
According to the inventions of claims 3 and 5, the conventional 3D sound reproduction system is
realized by outputting the delayed near signal and the delayed far signal obtained by delaying the
near signal and the far signal forming the audio signal to the speaker array. As for the near
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signal, it is possible to present a sound image of a place closer to the listener than the position of
the actually arranged speaker while maintaining the compatibility with the listener, and the
listener can experience the three-dimensional sound with a three-dimensional effect. .
[0026]
Next, embodiments of the present invention will be described in detail with reference to the
drawings as appropriate.
(Configuration of 3D Sound Recording Device, First Embodiment) FIG. 1 shows a block diagram
of the 3D sound recording device.
As shown in FIG. 1, the 3D sound recording apparatus 1 (1A) is an audio signal that becomes 3D
sound (stereo sound, surround sound) that makes the listener feel a sense of distance and sound
when playing back. The signal is split into a near signal (sound signal for near-field sound) that
produces a sound image at a short distance of the listener and a far signal (sound signal for fardistance sound) that produces a sound image at a far distance of the listener (allocation Audio
signal branching means 3 and near signal / far signal recording means 5).
[0027]
The audio signal is composed of two channels, that is, an audio signal for R and an audio signal
for L when it becomes stereo sound (two-channel stereo) when reproduced, and surround sound
(5 In the case of channel stereo), it is composed of five channels: an R audio signal, an L audio
signal, a C audio signal, an SR audio signal, and an SL audio signal.
[0028]
The audio signal branching means 3 allocates to a specific channel based on the direction to be
localized or branches into a plurality of channels, and further, the input audio signal is a near
signal based on a preset setting ratio. It branches (allocates) into (a near-field sound audio signal)
and a far signal (a far-distance sound audio signal).
That is, for each channel to which the input audio signal is allocated, two systems of audio
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signals for short distance and long distance are generated.
[0029]
In addition, the setting ratio is set in advance to reproduce a desired sense of distance by a sound
image generated when being reproduced, for example, a sound source is present in a range of
several meters around the listener. In this case, if the setting ratio of the near signal to the far
signal is 4: 1, and conversely that the sound source is also present at a position several tens of
meters away from the listener, the near signal and the far signal The setting ratio of is 1: 4.
[0030]
The setting ratio exemplified here is merely an example, and the audio signal is a musical tone
played by a musical instrument or the like, a voice uttered by an actor or the like, or a noise
generated when a moving object such as a vehicle or aircraft moves. The setting ratio may be
suitable for each audio signal.
[0031]
A near signal (sound signal for near-field sound) generates a sound image at a near distance from
the position of the listener when being reproduced, and in the case of stereo sound (two-channel
stereo), a sound signal for right near-field and left near This is a distance audio signal, and in the
case of surround sound (5 channel stereo), a right short distance voice signal, a left short
distance voice signal, a center short distance voice signal, a right back short distance voice signal
and a left back short distance voice It is a signal.
[0032]
A far signal (sound signal for far-distance sound) generates a sound image at a long distance
from the position of the listener when being reproduced, and in the case of stereo sound (twochannel stereo), a sound signal for far-distance and Left far-range audio signal, in the case of
surround sound (5-channel stereo), right long-range audio signal, left far-range audio signal,
center far-range audio signal, right-rear far-range audio signal and left-back It is an audio signal
for long distance.
[0033]
The near signal / far signal recording means 5 is constituted by a magnetic recording medium
such as a hard disk, an optical recording medium such as an optical disc, etc. The near signal
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(voice signal for short distance) and far A signal (sound signal for far distance) is recorded.
When the near signal / far signal recording means 5 is constituted by a single device, the total
number of signals is 8 to 10 (10 when the audio signal supplied to the surround speaker is
branched into the near signal and the far signal) Therefore, a conventional recorder (not shown)
can be diverted as it is.
[0034]
According to the three-dimensional sound recording apparatus 1 (1A), the audio signal branching
unit 3 branches the audio signal at a preset setting ratio in order to reproduce a desired sense of
distance.
Then, the near signal (long distance audio signal) and the far signal (long distance audio signal)
branched by the audio signal branching unit 3 are recorded in the near signal / far signal
recording unit 5.
Therefore, compatibility with the conventional stereophonic sound reproduction system can be
maintained if these near signals (sound signals for short distance) and far signals (sound signals
for far distance) are synthesized at the time of reproduction. Presenting a sound image of a
location closer to the listener than the position of the actually arranged loudspeakers by the near
signal (voice signal for short distance) and the far signal (voice signal for far distance) branched
by adjusting the setting ratio be able to.
[0035]
Here, an explanation will be added on the audio signal recorded by the three-dimensional sound
recording apparatus 1 (1A).
Since the audio signal handled here is a signal that does not include sound (sound signal, indirect
sound) called dry source, the near signal (audio signal for short distance) and far signal (for
which the audio signal is branched) are separated. The signal (sound signal for far distance)
naturally does not include the echo signal and the indirect sound.
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[0036]
Therefore, in this embodiment, only the far signal (sound signal for far distance) includes
electrical reverberation and sound (indirect sound and reflected sound) in the sound collecting
place.
[0037]
(Configuration of 3D Sound Recording Apparatus, Second Embodiment) Next, a block diagram of
the 3D sound recording apparatus (2nd embodiment) is shown in FIG.
As shown in FIG. 2, the stereophonic sound recording apparatus 1 (1B) records the audio signal
generated from the "sound source (far sound source, near sound source)" and then, when the
listener listens to it, In order to achieve this, the near signal pickup means 7a and the far signal
pickup means 7b are provided at the positions corresponding to each channel, and the near
signal picked up by the near signal pickup means 7a and the far signal pickup means 7b is
provided. A signal and a far signal are recorded, and the near signal / far signal reception /
output means 9 and the near signal / far signal recording means 5 are provided. In addition,
about the structure similar to the three-dimensional sound recording device 1 (1A) demonstrated
with reference to FIG. 1, the same code | symbol is attached | subjected and the description is
abbreviate | omitted. Note that the sound source (far sound source, near sound source) is
something that generates some kind of sound, such as a single or a plurality of musical
instruments or people. Further, a sound source located outside of a certain distance from the
listener (virtual) is displayed as "far sound source", and a sound source located within a certain
distance from the listener (virtual) as "close sound source".
[0038]
The near signal collection means 7a is constituted by a general microphone and is disposed
within a certain distance range from the virtual listener position, and the sound signal emitted
from the sound source is a near signal (sound signal for short distance) It picks up as). The near
signal pickup means 7a is disposed at a position corresponding to each channel of the surround
sound (five channels). That is, the near-signal collecting means 7a for the center speaker in the
direction of 12 o'clock of the virtual listener's position radially around the virtual listener's
position is right in the direction of 45 degrees to the right of the virtual listener's position. The
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near signal collecting means 7a for the speaker is in the direction of 45 degrees to the left of the
virtual listener position in the direction of the virtual listener, and the near signal collecting
means 7a for the left speaker is in the direction of 45 degrees to the right rear of the virtual
listener position. The near signal collection means 7a for the right surround speaker is disposed
near the left rear 45 degrees of the virtual listener position, in the near signal collection means
7a for the left surround speaker.
[0039]
The far signal collecting means 7b is constituted by a general microphone and is disposed
outside a certain distance range from the virtual listener position, and the far signal (long
distance voice signal is generated from the sound signal emitted from the sound source It picks
up as). The far signal pickup means 7b is disposed at a position corresponding to each channel of
the surround sound (5 channels). In other words, the distant signal collecting means 7b for the
center speaker in the direction of 12 o'clock of the virtual listener position radially about the
position of the virtual listener position is 45 degrees right of the virtual listener position The far
signal collection means 7b for the right speaker, the far signal collection means 7b for the left
speaker in the direction of 45.degree. To the left of the virtual listener position, and the right
surround in the direction of 45.degree. A far signal collecting means 7b for the speaker is
disposed at a position 45 degrees left and back of the virtual listener's position, the far signal
collecting means 7b for the left surround speaker is disposed. As known in the current surround
sound collection, the arrangement direction (arrangement angle from the virtual listener
position) of the near signal collection means 7a and the far signal collection means 7b is a rough
guide, It is not limited to this direction and angle.
[0040]
The near signal / far signal reception / output means 9 receives the near signal (voice signal for
short distance) and the far signal (voice signal for far distance) picked up by the near signal
pickup means 7a and the far signal pickup means 7b. The signal is transmitted to the near signal
/ far signal recording means 5 and output to the outside.
[0041]
(Configuration of 3D Sound Reproducing Apparatus, First Embodiment) Next, a block diagram of
the 3D sound reproducing apparatus (1st embodiment) is shown in FIG.
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As shown in FIG. 3, the three-dimensional sound reproducing apparatus 11 (11A) is a near signal
(sound signal for short distance) and a far signal (sound for long distance) recorded by the threedimensional sound recording apparatus 1 (1A, 1B). When a signal is input, stereophonic sound
(stereo sound, surround sound) is generated in the listener when the signal is input and output
means 13, storage means 15, and a speaker system 17 are provided.
[0042]
The input / output means 13 is an interface for inputting the near signal (speech signal for short
distance) and the far signal (speech signal for long distance) into which the audio signal is
branched, and also the storage means 15 and the speaker system 19 (near It is an interface for
outputting a near signal (voice signal for short distance) and a far signal (voice signal for far
distance) to a speaker and a far speaker. The total number of signals of the near signal and the
far signal input to the input / output means 13 is 8, and if it is this number, it can be recorded on
a conventional general multi-channel recorder (not shown). It is possible to maintain
compatibility with conventional stereophonic sound reproduction methods.
[0043]
The storage unit 15 is configured of a magnetic recording medium such as a hard disk, an optical
recording medium such as an optical disk, etc. The near signal (sound signal for short distance)
and far signal (sound for long distance) input to the input / output unit 13 Signal) is stored.
[0044]
The speaker system 17 includes left (left speaker), center (center speaker), right (right speaker)
speakers, and left (left surround speaker (LS)) and right (right surround speaker (RS)) surround
speakers. The left speaker, the center speaker, and the right speaker are configured such that a
plurality of directional speakers having different directivity characteristics can be housed in a
single housing and driven independently.
[0045]
Therefore, in FIG. 3, for the left speaker, directional speakers (near signal units) corresponding to
near signals are collectively referred to as L1, and directional speakers (far signal units)
corresponding to far signals are collectively illustrated as L2. In the center speaker, directional
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speakers (near signal units) corresponding to near signals are collectively referred to as C1, and
directional speakers (far signal units) corresponding to far signals are collectively illustrated as
C2, Regarding the right speaker, directional speakers (near signal units) corresponding to near
signals are collectively referred to as R1 and directional speakers (far signal units) corresponding
to far signals are collectively illustrated as R2.
Hereinafter, the left speaker (L1, L2), the center speaker (C1, C2), and the right speaker (R1, R2)
will be described.
[0046]
In this embodiment, in the case of surround sound, the audio signal supplied to each of the
speakers disposed to the right rear and left rear of the listener is less required to give the listener
a clear sense of distance, In order to simplify the apparatus, it is decided not to branch into the
near signal and the far signal.
That is, the right surround speaker is supplied as a right rear audio signal, and the left surround
speaker is supplied as a left rear audio signal.
[0047]
The left speaker (L1, L2), the center speaker (C1, C2) and the right speaker (R1, R2) are disposed
in front of the listener, and the left surround speaker (LS) and the right surround speaker (RS) are
It is placed behind the listener.
[0048]
Generally, by using a speaker having a sharp directivity for near signals and a speaker having an
opposite directivity for far signals, each signal (near signal, far signal) is localized at different
distances.
[0049]
According to this stereophonic sound reproducing apparatus 11 (11A), the near signal (audio
signal for short distance) and the far signal (audio signal for long distance) input to the input
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means 13 are transmitted to the left speaker (L1, L1) of the speaker system 17. L2), by being
reproduced from the center speaker (C1, C2) and the right speaker (R1, R2), they are spatially
added.
Further, by adding in advance two systems of audio signals of a near signal (sound signal for
short distance) and a far signal (sound signal for far distance), compatibility with the
conventional stereophonic sound reproduction system can be maintained.
[0050]
(Configuration of 3D Sound Reproducing Apparatus, Second Embodiment) Next, a block diagram
of the 3D sound reproducing apparatus (2nd embodiment) is shown in FIG.
As shown in FIG. 4, the 3D sound reproducing apparatus 11 (11B) is a near signal (sound signal
for short distance) and a far signal (sound for long distance) recorded by the 3D sound recording
apparatus 1 (1A, 1B). When a signal is input, it generates stereophonic sound (stereo sound,
surround sound) to the listener, and the input / output means 13, storage means 15, delay means
19 (near signal delay means, far signal delay) Means, an adding means 21, a speaker array 23,
and a surround speaker 25. In addition, about the structure similar to the three-dimensional
sound reproduction apparatus 11 (11A) demonstrated with reference to FIG. 3, the same code |
symbol is attached | subjected and the description is abbreviate | omitted.
[0051]
The delay means 19 is composed of a plurality of delay elements for delaying the near signal
(voice signal for short distance) and the far signal (voice signal for far distance) input to the input
/ output means 13, and the left speaker array (L) Delay element 19a for the near signal, the delay
element 19b for the far signal of the left speaker array (L), the delay element 19c for the near
signal of the center speaker array (C), and the distance of the center speaker array (C) A delay
element 19 d for signal, a delay element 19 e for near signal of the right speaker array (R), and a
delay speaker 19 f for far signal of the right speaker array (R) are provided. In this embodiment,
the delay means 19 delays each of the six lines of the near signal (speech signal for short
distance) and the far signal of the six lines (speech signal for far distance).
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[0052]
The near signal (voice signal for short distance) and the far signal (voice signal for long distance)
delayed by the delay elements 19a to 19f are collectively referred to as a delayed near signal
(voice signal for delayed short distance) and a delay A far signal (delayed far distance audio
signal) is used.
[0053]
The delay element 19a for near signal of the left speaker array (L) is for delaying the left short
distance audio signal, and the left short distance audio signal is delayed by the delay element 19a
to the left speaker array (L) of the speaker array 23. The left speaker array (L) is given a sharp
directivity when it is output, and is localized at a short distance to the left from the listener, or
forms a focus.
The left short distance audio signal delayed by the delay element 19a is a delayed left short
distance audio signal.
[0054]
The delay element 19b for the far signal of the left speaker array (L) is for delaying the left far
distance audio signal, and the left far distance audio signal is delayed by the left element of the
speaker array 23 by the delay element 19b. When output from L), the left speaker array (L) is
given directivity to diffuse, and is localized at a far distance (far distance) from the listener. The
left far distance audio signal delayed by the delay element 19b is used as a delayed left far
distance audio signal.
[0055]
The delay element 19c for near signal of the center speaker array is for delaying the center short
distance audio signal, and the center short distance audio signal for the center short distance
audio signal is the center speaker array (C) of the speaker array 23 by this delay element 19c.
The center speaker array (C) is given a sharp directivity when it is output, and is localized at a
near front distance from the listener or forms a focus. The center short distance audio signal
delayed by the delay element 19c is used as a delay center short distance audio signal.
09-05-2019
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[0056]
The delay element 19d for far signal of the center speaker array is for delaying the center far
distance audio signal, and the center far distance audio signal from the center speaker array (C)
of the speaker array 23 is delayed by the delay element 19d. When output, the center speaker
array (C) is given directivity to diffuse, and is localized at a far distance (far) from the listener.
The center far distance audio signal delayed by the delay element 19d is used as a delay center
far distance audio signal.
[0057]
The delay element 19e for near signal of the right speaker array is for delaying the right short
distance audio signal, and the right short distance audio signal is outputted from the right
speaker array (R) of the speaker array 23 by the delay element 19e. In this case, the right
speaker array (R) is given sharp directivity, and is localized at a short distance to the right of the
listener or forms a focus. The right short distance audio signal delayed by the delay element 19e
is set as a delayed right short distance audio signal.
[0058]
The far signal delay element 19 f for the right side speaker array is for delaying the right far
distance audio signal, and the right long distance audio signal from the right speaker array (R) of
the speaker array 23 is delayed by the delay element 19 f. When outputted, the right speaker
array (R) is given directivity so as to be diffused, and localized at a far distance (far) from the
listener. The right far distance audio signal delayed by the delay element 19 f is set as a delayed
right far distance audio signal.
[0059]
The delayed near signals and delayed far signals delayed by the delay elements 19a to 19f of the
delay means 19 are added by the adders 21a to 21c of the addition means 21, and the left
speaker array (L) of the speaker array 23 and the center speaker It is outputted to the array (C)
and the right speaker array (R).
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[0060]
The near-signal delay elements 19a, 19c, and 19e are paths from the center of the plane (the
center of the array) to the focal point so as to locally increase the sound pressure near a certain
point (focal point) in space. And the amount of delay corresponding to the difference between the
path from each speaker unit to the focal point.
[0061]
The addition means 21 comprises adders 21a, 21b and 21c for adding the signals for six lines
outputted from the delay means 19, and the adder 21a is for the left speaker array (L) and the
adder 21b is for For the center speaker array (C), an adder 21c is provided for the right speaker
array (R).
[0062]
The speaker array 23 is formed by arranging a plurality of speaker units (not shown) radially or
in a line, and the left speaker array (L), the center speaker array (C), the right speaker array ( R).
In this embodiment, six speaker units are provided in each of the left speaker array (L), the
center speaker array (C), and the right speaker array (R).
That is, six wires are provided from the adding means 21 to each of the left speaker array (L), the
center speaker array (C), and the right speaker array (R), respectively. A signal is provided.
[0063]
The surround speaker 25 is disposed behind (surrounding) the listener, and includes a left
surround speaker (LS) and a right surround speaker (RS).
[0064]
According to this three-dimensional sound reproducing apparatus 11 (11 B), the near signal
(audio signal for short distance) and the far signal (audio signal for long distance) input to the
input / output unit 13 are delayed by the delay elements 19 a of the delay unit 19. The signal is
09-05-2019
19
delayed by 19f and output from each speaker unit of the speaker array (L, C, R) of the speaker
array 23, and each is spatially added.
Further, in this embodiment, a signal obtained by adding two audio signals of a near signal
(sound signal for short distance) and a far signal (sound signal for far distance) at the output
stage of the input means 13 is directly added If it supplies to a normal speaker, compatibility
with the conventional three-dimensional sound reproduction system can be maintained.
[0065]
(Operation of Three-Dimensional Sound Recording Device (First Embodiment)) Next, the
operation of the three-dimensional sound recording device 1 (1A) will be described with
reference to the flowchart shown in FIG. 5 (see FIG. 1 as appropriate).
First, a user who uses the three-dimensional sound recording apparatus 1 (1A) inputs a setting
ratio to the audio signal branching means 3 of the apparatus 1 (1A) (S1). Subsequently, the user
inputs an audio signal (audio signals of a plurality of channels forming surround sound) to the
audio signal branching means 3 of the three-dimensional audio recording apparatus 1 (1A) (S2).
[0066]
Then, based on the input setting ratio, the 3D audio recording apparatus 1 (1A) branches
(allocates) the audio signal of each channel forming the surround sound (S3), and the near signal
(audio signal for short distance) And the far signal (sound signal for far distance) is recorded in
the near signal / far signal recording means 5 (S4).
[0067]
(Operation of Three-Dimensional Sound Recording Device (Second Embodiment)) Next, the
operation of the three-dimensional sound recording device 1 (1B) will be described with
reference to the flowchart shown in FIG. 6 (see FIG. 2 as needed).
First, the user who uses the 3D sound recording apparatus 1 (1B) can use the near signal pickup
means 7a for each channel at a distance from the sound source and a distance from the sound
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20
source for each channel. And a far signal collecting means 7b of Then, the sound signal emitted
from the sound source is collected by the near signal collection means 7a and the far signal
collection means 7b, and the near signal and the far signal are acquired (S11).
[0068]
Subsequently, the 3D sound recording apparatus 1 (1B) receives the near signal and the far
signal collected by the near signal / far signal reception output means 9 (S12), and the near
signal (sound signal for short distance) and The far signal (sound signal for far distance) is
recorded in the near signal / far signal recording means 5 (S13).
[0069]
Note that the method of recording the near signal (sound signal for short distance) and the far
signal (sound signal for long distance) by the three-dimensional sound recording apparatus 1
(1A, 1B) is not an alternative method, It is possible to do it in combination.
[0070]
(Operation of Three-Dimensional Sound Reproducing Apparatus (First Embodiment)) Next, the
operation of the three-dimensional sound reproducing apparatus 11 (11A) will be described with
reference to the flowchart shown in FIG. 7 (see FIG. 3 as needed).
First, a user (listener) who uses the 3D sound reproducing apparatus 11 (11A) sends a near
signal (sound signal for short distance) and a far signal (sound for long distance) to the input /
output means 13 of the device 11 (11A). Signal) is input (S21).
[0071]
Then, the three-dimensional sound reproducing apparatus 11 (11A) stores the near signal (sound
signal for short distance) and the far signal (sound signal for far distance) input to the input unit
13 in the storage unit 15 (S22).
Subsequently, the three-dimensional sound reproducing apparatus 11 (11A) includes the left
speaker (L1, L2), the center speaker (C1, C2), the right speaker (R1, R2), the left surround
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21
speaker (LS), and the right surround It outputs to a speaker (LR) (S23).
[0072]
That is, the near signal unit L1 of the left speaker (L1, L2) has the near signal of the left channel,
the far signal unit L2 has the far signal of the left channel, and the far signal unit of the center
speaker (C1, C2) has the center signal of the center channel. The near signal is input to the far
signal unit C2, the far signal of the center channel, the near signal of the right channel to the
near signal unit R1 of the right speaker (R1, R2), and the far signal of the right channel to the far
signal unit R2. . A left rear audio signal and a right rear audio signal are directly input from the
input / output unit 13 to the left surround speaker (LS) and the right surround speaker (RS) of
the speaker system 17, respectively.
[0073]
(Operation of 3D Sound Reproducing Apparatus (Second Embodiment)) Next, the operation of the
3D sound reproducing apparatus 11 (11B) will be described with reference to the flowchart
shown in FIG. 8 (see FIG. 4 as needed). First, a user (listener) who uses the 3D sound reproducing
apparatus 11 (11B) sends a near signal (audio signal for short distance) and a far signal (audio
for long distance) to the input / output means 13 of the apparatus 11 (11B). Signal) is input
(S31).
[0074]
Then, the three-dimensional sound reproducing apparatus 11 (11B) stores the near signal (sound
signal for short distance) and the far signal (sound signal for far distance) input to the input /
output unit 13 in the storage unit 15 (S32). Subsequently, the three-dimensional sound
reproducing apparatus 11 (11B) delays the near signal (sound signal for short distance) and the
far signal (sound signal for long distance) by the delay unit 19 to generate delayed near signal
and delayed far signal. It outputs to the addition means 21 (S33). The delayed left rear audio
signal and the delayed right rear audio signal are input directly from the delay unit 19 to the left
surround speaker (LS) and the right surround speaker (RS) of the surround speaker 25.
[0075]
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22
Then, the three-dimensional sound reproducing apparatus 11 (11B) adds the delayed near signal
(sound signal for delayed short distance) and the delayed far signal (sound signal for delayed
long distance) by the addition means 21 to obtain the speaker array 23 To each speaker unit (not
shown) of the speaker array (L, C, R) (S34).
[0076]
As mentioned above, although embodiment of this invention was described, this invention is not
limited to the said embodiment.
For example, in the present embodiment, the three-dimensional sound recording apparatus 1
(1A, 1B) and the three-dimensional sound reproducing apparatus 11 (11A, 11B) have been
described. (3) can be regarded as a stereophonic sound recording method and stereophonic
sound reproduction method, which are regarded as one process of processing a far signal). In
these cases, the same effects as those of the three-dimensional sound recording apparatus 1 (1A,
1B) and the three-dimensional sound reproducing apparatus 11 (11A, 11B) can be obtained.
[0077]
It is a block diagram of the three-dimensional acoustic recording device (1st embodiment) which
concerns on embodiment. It is a block diagram of the three-dimensional acoustic recording
device (2nd embodiment) which concerns on embodiment. It is a block diagram of the threedimensional sound reproduction apparatus (1st embodiment) which concerns on embodiment. It
is a block diagram of the three-dimensional sound reproduction apparatus (2nd embodiment)
which concerns on embodiment. It is a flowchart explaining operation | movement of the threedimensional sound recording device shown in FIG. It is a flowchart explaining operation |
movement of the three-dimensional sound recording device shown in FIG. It is a flowchart
explaining operation | movement of the three-dimensional sound reproduction apparatus shown
in FIG. It is a flowchart explaining operation | movement of the three-dimensional sound
reproduction apparatus shown in FIG.
Explanation of sign
[0078]
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1 (1A, 1B) 3D sound recording device 3 audio signal branching means 5 near signal / far signal
recording means 7a near signal collecting means 7b far signal collecting means 9 near signal /
far signal receiving / output means 11 (11A, 11B) 3D sound reproducing apparatus 13 input /
output means 15 storage means 17 speaker system 19 delay means 21 addition means 23
speaker array 25 surround speaker
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