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JP2008282042

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2008282042
To exchange acoustic characteristics. SOLUTION: An inverse characteristic conversion unit that
converts an acoustic characteristic of one sound field into an inverse characteristic, a
reproduction unit that reproduces music data, and an acoustic characteristic output that outputs
an acoustic characteristic different from the acoustic characteristic of one sound field An
adjusting unit that adjusts music data reproduced by the reproducing unit on the basis of the
inverse acoustic characteristic of one sound field converted by the inverse characteristic
converting unit and the acoustic characteristic output by the acoustic characteristic output unit;
And an output unit that outputs the music data adjusted by the adjustment unit to one sound
field. [Selected figure] Figure 8
Playback device
[0001]
The present invention relates to a reproduction apparatus suitable for reproducing, for example,
a music source recorded in a concert hall or the like in a listening room.
[0002]
The acoustic characteristics of the listening room are different depending on the size, shape and
interior of the listening room.
For this reason, there is a sound reproduction device that corrects the sound characteristics of
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the listening room to be close to the standard sound characteristics and the sound characteristics
preferred by the listener.
[0003]
In such an acoustic reproduction apparatus, for example, a measurement signal for measuring an
acoustic characteristic is radiated into a listening room, and a response (reflected sound) is
collected to calculate an indoor acoustic characteristic of the listening room. Then, there is one in
which a correction characteristic for correcting the acoustic characteristic in the listening room is
calculated from the calculated room acoustic characteristic, and the reproduction signal is
corrected by the calculated correction characteristic (Patent Document 1).
[0004]
Moreover, in order to measure room acoustical characteristics such as a listening room, it is
necessary to obtain a transfer function from the sound source position to the listening position.
In the case of the listening room, the sound source position is the speaker position of the sound
reproduction device.
[0005]
For example, in the intensity stereo system, two speakers arranged on the front left and right
become the sound source position. Also, for example, in the 5.1 channel system, it comprises two
speakers arranged at the front left and right, one speaker at the front center, two speakers
arranged at the rear left and right, and one woofer, These six speakers are sound source
positions. Thus, when the speakers are at the sound source position, the measurement is made
for each speaker of each channel. Then, the transfer function when all channels are driven can be
obtained by calculating the sum of the transfer functions of each channel.
[0006]
As a measurement microphone installed at a listening position, a near four-point method
microphone is used which has a directional characteristic similar to that of a listener or a sound
source position search (Non-Patent Document 1).
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[0007]
Also, as microphones having the same characteristics as the listener's directional characteristics,
there is a dummy head microphone, and it is a simplified one on the both sides corresponding to
the human ear on the surface of a spheroid made to resemble a head. Some have a microphone
embedded.
[0008]
Also proposed is a method of acquiring information about installation and characteristic
adjustment of an audio system via a network, and according to it, the audio system automatically
adjusts the characteristic.
[0009]
For example, a service system is constructed by a center server and an audio system connected
to the center server via a communication network.
Then, the center server transmits audio device adjustment data and audio device attachment data
to the audio system.
[0010]
Meanwhile, the audio system is adapted to automatically adjust the acoustic characteristics using
the received audio device adjustment data.
Further, there is a system in which the audio system displays the received attachment data of the
audio device, and the user attaches the audio device to the vehicle based on the displayed
attachment method (Patent Document 2).
[0011]
Non-patent document 2 is available for the interaural correlation coefficient in the diffuse sound
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field.
Japanese Patent Laid-Open Publication No. 6-327089 Japanese Patent Laid-Open Publication No.
2002-67815 Japanese Patent Laid-Open Publication No. 2000-091865 Japanese Patent LaidOpen Publication No. 2003-202861 Acoustic measurement of a concert hall by the proximity
four point method Yoshio Yamazaki, Atsushi Ito, JAS Journal 1987 Tsuki issue Inter-aural
correlation coefficient in the diffusion and reproduction sound field, Mikio Higashiyama, et al.
[0012]
By the way, when music is played by a plurality of players such as an orchestra etc., the players
are influenced by each other's performance, potential abilities are extracted, and it is more
sophisticated than when performing individually. It is known to be a performance.
[0013]
However, when performers are at remote places, it is possible to transmit and receive
performance data of each other via the network, but it is difficult to obtain a live feeling as if they
are playing in the same space It is.
[0014]
Therefore, the present invention has been made in view of the above-mentioned point, and
provides a playback apparatus capable of obtaining a live feeling as if performers at remote
places are playing in the same space. The purpose is to
[0015]
In order to solve the above-mentioned problems, the reproducing apparatus according to the
present invention includes an inverse characteristic converting unit that converts an acoustic
characteristic of one sound field into an inverse characteristic, a reproducing unit that
reproduces music data, and the one sound field. Based on acoustic characteristic output means
for outputting an acoustic characteristic different from the acoustic characteristic, inverse
acoustic characteristic of the one sound field converted by the inverse characteristic conversion
means, and acoustic characteristic output by the acoustic characteristic output means The
adjustment means for adjusting the music data reproduced by the reproduction means, the
database storing a plurality of acoustic characteristics different from one sound field, and the
analysis of the music data reproduced by the reproduction means The system comprises: reading
means for reading one acoustic characteristic from the database; and output means for
outputting the music data adjusted by the adjusting means to the one sound field, wherein the
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adjusting means comprises the inverse characteristic converting means. Reverse acoustic
characteristics of conversion has been one sound field, in accordance with one of the acoustic
characteristics read by the reading means, and adjusts the music data reproduced by the
reproducing means.
[0016]
The database may be configured to be connected via a network.
[0017]
According to the present invention, the sound and sound field characteristics of one studio can
be interchanged with the sound and sound field characteristics of another studio, so that for each
performance, it will be played together at the same place. It is possible to give the sound and
sound field space of LIVE feeling as if you are doing.
[0018]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
[0019]
Here, the present invention is applied to, for example, a playback apparatus configured as shown
in FIG.
The reproduction apparatus 1 includes an audio data reproduction unit 2 for reproducing audio
data, a metadata analysis unit 3 for extracting space characteristic data (metadata) from the
sound data, and an acoustic characteristic data storage unit 4 for storing metadata. The
reproduction characteristic based on the metadata analyzed by the metadata analysis unit 3 and
the switch 5 for switching any of the metadata stored in the acoustic characteristic data storage
unit 4, the metadata, and the room acoustic characteristic A reproduction characteristic control
unit 6 that controls the reproduction signal supplied to the adjustment unit 7, a reproduction
characteristic adjustment unit 7 that adjusts the reproduction signal according to the control of
the reproduction characteristic control unit 6, and audio data supplied from the audio data
reproduction unit 2 Data, and a changeover switch 8 for switching the signal supplied from the
room acoustic characteristic measurement data storage unit 19, audio data outputted from the
reproduction characteristic adjustment unit 7, room acoustic characteristics A switch 9 for
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switching acoustic characteristic measurement data output from the measurement data storage
unit 19, a D / A converter 10 for converting data supplied via the switch 9 into an analog signal,
and a D / A converter 10 , A speaker system 12 for outputting the amplified signal, a microphone
system 13 for collecting acoustic data, and a microphone amplifier for amplifying the collected
acoustic data 14, an A / D conversion unit 15 for converting amplified acoustic data into a digital
signal, a room acoustic characteristic analysis unit 16 for analyzing acoustic characteristics of an
environment collected by the microphone system 13, and a room acoustic characteristic analysis
unit 16 Room acoustic characteristic data storage unit 17 for storing the acoustic characteristics
analyzed in step; data analyzed by the room acoustic characteristic analysis unit 16; A
changeover switch 18 for switching between the data stored in the room acoustic characteristic
data storage unit 17, and a room acoustic characteristic measurement data storage unit 19
measurement data for measuring the room acoustic characteristics is stored.
In the following description, it is assumed that the reproduction device 1 is disposed in a
predetermined studio.
[0020]
The audio data reproducing unit 2 is a recording medium such as an optical disc in which
metadata indicating the nature of the space in which the audio data is reproduced is recorded
together with the audio data recorded by the on microphone so as not to include reflected sound
and reverberation sound. To play.
The audio data reproduction unit 2 supplies the reproduced audio data to the reproduction
characteristic adjustment unit 7 and the changeover switch 8.
Also, the audio data reproduction unit 2 supplies the metadata analysis unit 3 with the metadata
reproduced from the recording medium.
[0021]
The audio data reproduction unit 2 may be configured to reproduce audio data and metadata
supplied from another reproduction device disposed at a different place via a network.
[0022]
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The metadata analysis unit 3 is configured to acquire metadata input from the audio data input
unit 2.
Then, the acquired metadata is analyzed to determine an acoustic characteristic of a studio which
is a reproduction sound field space suitable for reproducing audio data.
The nature of the reproduction sound field space recorded as metadata on the recording medium
can be shown as shown in FIG.
[0023]
The nature of the reproduced sound space is indicated by the reverb.
The reverberation is indicated by the original sound (direct sound), the initial reflection sound,
and the reverberation sound of the reverb body as shown in FIG. 2 (b).
[0024]
For this reason, the parameter indicating the nature of the reproduced sound field space and its
measure (definition) can be shown as shown in FIG. 2 (a).
[0025]
The late reverberation (late reverberation) is indicated by the reverberation time length from the
direct sound to the reverb body, and for example, the numerical value is set to 1.4 to 2.8 (sec).
The liveness (liveness) is indicated by the reverberation time length of the high sound, for
example, the numerical value is set to 1.5 to 2.2 (sec).
The source presence is indicated by the ratio of the direct sound to the early reflection, and for
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example, the numerical value is −2 to 2 (dB). Worms (warmth) is indicated by the ratio of the
initial reflection of bass to the initial reflection of treble, and for example, the numerical value is
1.2 to 1.25 (dB). The room presence is indicated by the level of reverberation, for example, the
numerical value is −0.5 to 0.5 (dB). Running reverberation (running reverberation) is indicated
by the reverberation time length of the initial reflection sound, for example, the numerical value
is set to 1.8 to 2.6 (sec). Furthermore, the envelope is indicated by the ratio of the initial
reflection to the direct sound, and the numerical value is, for example, 0.1 to 0.3 (%).
[0026]
The acoustic characteristic data storage unit 4 includes, for example, a memory, and stores
acoustic characteristic data analyzed by the metadata analysis unit 3.
[0027]
The changeover switch 5 has a terminal a and a terminal b, the metadata analysis unit 3 is
connected to the terminal a, the acoustic characteristic data storage unit 4 is connected to the
terminal b, and the reproduction characteristic control unit 6 has metadata It is a switch for
supplying either the acoustic characteristic data of the analysis unit 3 or the acoustic
characteristic data of the acoustic characteristic data storage unit 4.
[0028]
The reproduction characteristic control unit 6 receives acoustic characteristic data input from the
metadata analysis unit 3 or the acoustic characteristic data storage unit 4 via the changeover
switch 5 and room acoustic characteristic data for studio input via the changeover switch 18. ,
And control of the reproduction characteristic adjustment unit 7 is performed.
In addition, the acquisition method of the acoustic characteristic data of a studio is mentioned
later.
[0029]
The reproduction characteristic adjustment unit 7 adjusts the acoustic characteristic of the audio
data reproduced by the audio data input unit 2 based on the control of the reproduction
characteristic control unit 6.
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[0030]
The changeover switch 8 has a terminal c and a terminal d, the room acoustic characteristic
measurement data storage unit 19 is connected to the terminal c, the audio data reproduction
unit 2 is connected to the terminal d, and the room acoustic characteristic analysis unit 16 is It is
a switch for supplying either the measurement data of the room acoustic characteristic
measurement data storage unit 19 or the audio data of the audio data input unit 2.
[0031]
The changeover switch 9 has a terminal e and a terminal f, the reproduction characteristic
adjustment unit 7 is connected to the terminal e, the room acoustic characteristic measurement
data storage unit 19 is connected to the terminal f, and the D / A conversion unit 10 in the
subsequent stage On the other hand, it is a switch for supplying either the audio data from the
reproduction characteristic adjustment unit 7 or the acoustic characteristic measurement data
from the acoustic characteristic measurement data storage unit 19 described later.
[0032]
The D / A conversion unit 10 converts a digital signal (data or acoustic characteristic
measurement data) input through the changeover switch 9 into an analog signal (voice signal or
acoustic characteristic measurement signal) and outputs it.
[0033]
The power amplification unit 11 amplifies the analog signal supplied from the D / A conversion
unit 10 to a predetermined level, and supplies the amplified signal to the speaker system 12.
[0034]
The speaker system 12 outputs the signal amplified by the power amplification unit 11 as an
audible sound.
[0035]
The microphone system 13 is disposed, for example, at a predetermined listening point (listening
position) when measuring room acoustical characteristics of a studio, and collects sound at that
position.
[0036]
The microphone amplification unit 14 amplifies and outputs a sound collection signal obtained
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by collecting sound by the microphone system 13.
[0037]
The A / D conversion unit 15 converts the analog sound collection signal from the microphone
amplification unit 14 into a digital sound collection signal and outputs it.
[0038]
The room acoustic characteristic analysis unit 16 analyzes the collected sound data input via the
A / D conversion unit 15 using the input signal input via the changeover switch 8 as a reference
signal. Get room acoustics.
[0039]
The room acoustic characteristic data storage unit 17 is configured of, for example, a memory,
and stores the room acoustic characteristic data obtained by the room acoustic characteristic
analysis unit 16.
[0040]
The changeover switch 18 has a terminal g and a terminal h, the indoor acoustic characteristic
analysis unit 16 is connected to the terminal g, the indoor acoustic characteristic data storage
unit 17 is connected to the terminal h, and the reproduction characteristic control unit 6 Either
acoustic characteristic data temporarily stored in the room acoustic characteristic data storage
unit 17 or acoustic characteristic data directly output from the indoor acoustic characteristic
analysis unit 16 is supplied as acoustic characteristic data.
[0041]
The indoor acoustic characteristic measurement data storage unit 19 stores measurement data
for measuring indoor acoustic characteristics of a studio or the like.
Such measurement data may be an M-sequence signal (Maximum Length Sequence), a TSP (Time
Stretched Pulse) signal, or the like.
[0042]
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The control of the entire playback apparatus 1 and the switching control of the changeover
switches 5, 8, 9, and 18 are performed by a system controller (not shown).
[0043]
In the playback apparatus 1 configured as described above, based on the metadata recorded on
the recording medium or the acoustic characteristics obtained from the metadata supplied via
the network and the room acoustic characteristics of the actual studio, The acoustic
characteristics of the audio data output to the studio are adjusted.
For this reason, in the reproduction apparatus 1, the metadata analysis unit 3 for acquiring the
acoustic characteristic of the audio data is provided, and the microphone system 13 for
measuring the indoor acoustic characteristic of the studio is provided.
[0044]
3 (a) and 3 (b) are diagrams showing the main parts of the playback apparatus 1 for measuring
the acoustic characteristics.
FIG. 3A is a diagram showing a main part that measures acoustic characteristics using the room
acoustic characteristic measurement data storage unit 19.
In this case, sound source data suitable for the measurement item is selected and read out from
the room acoustic characteristic measurement data storage unit 19.
Then, the reproducing apparatus 1 transmits the read measurement data to the D / A conversion
unit 10 via the switch 9, performs D / A conversion by the D / A conversion unit 10, and then
amplifies it by the power amplification unit 11. The amplified measurement signal is output from
the speaker system 12.
[0045]
The output sound of the speaker system 12 is collected by the microphone of the microphone
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11
system 13 installed at a predetermined measurement point of the studio.
[0046]
Then, the sound collection signal output from the microphone of the microphone system 13 is
amplified by the microphone amplification unit 14, and the amplified sound collection signal is A
/ D converted by the A / D conversion unit 15. It is transmitted.
[0047]
In this case, the room acoustic characteristic analysis unit 16 analyzes the acoustic data collected
using the measurement data input from the room acoustic characteristic measurement data
storage unit 19 via the changeover switch 8 as the reference data. The acoustic characteristic
(transfer function) is obtained.
Further, the analysis result of the indoor acoustic characteristic analysis unit 16 is stored in the
indoor acoustic characteristic data storage unit 17.
[0048]
Here, the reason why the transfer function of the studio is obtained using the measurement data
of the room acoustic characteristic measurement data storage unit 19 as the reference data in
the room acoustic characteristic analysis unit 16 is as follows.
[0049]
Basically, if the signal of the measurement sound output from the speaker system 12 is an
impulse signal and the response is collected by the microphone system 13, the collected signal of
the microphone system 13 becomes the transfer function of the studio. In this case, it is difficult
to increase the S / N (signal to noise ratio).
Therefore, in the present embodiment, a signal with large energy is used as the measurement
data, and the room acoustic characteristic analysis unit 16 collects the collected sound data
(response signal) input through the A / D converter 15. The transfer function of the studio is
calculated by dividing by the measurement data input through the changeover switch 8.
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[0050]
Further, according to Non-Patent Document 2, it is possible to judge whether the sound field has
natural diffusivity by analyzing the correlation coefficient of two omnidirectional microphones
arranged at an equivalent interaural distance (about 30 cm). It is assumed.
Therefore, for example, if the reproduction characteristic is changed in several ways and the
correlation coefficient at the listening position at that time is measured, the room acoustic
characteristic analysis section 16 obtains room acoustic characteristic data with conditions close
to a natural diffuse sound field. Will be
[0051]
The measurement data of room acoustic characteristics generated from the room acoustic
characteristic measurement data storage unit 19 may be generated each time by an operation
unit such as a DSP (Digital Signal Processor).
[0052]
On the other hand, FIG. 3 (b) is a diagram showing the main part of measuring the acoustic
characteristic when the room acoustic characteristic measurement data storage unit 19 is not
used.
[0053]
In this case, the audio data reproduced by the audio data input unit 2 is used as measurement
data.
That is, after the audio data reproduced by the audio data input unit 2 is transmitted to the D / A
converter 10 through the reproduction characteristic adjustment unit 7 and the changeover
switch 9 and D / A converted by the D / A converter 10, The audio signal amplified and amplified
by the power amplifier 11 is output from the speaker system 12.
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13
[0054]
Also in this case, the output sound of the speaker system 12 is collected by the microphone of
the microphone system 13.
Then, the sound collection signal output from the microphone of the microphone system 13 is
amplified by the microphone amplification unit 14, and the amplified sound collection signal is A
/ D converted by the A / D conversion unit 15. Transmit
[0055]
The room acoustic characteristic analysis unit 16 performs analysis according to the
measurement item using voice data or the like input from the voice data input unit 2 via the
changeover switch 8 to obtain a studio as a reproduction sound field space. The acoustic
characteristic (transfer function) is obtained.
[0056]
The analysis result of the room acoustic characteristic analysis unit 16 is stored in the room
acoustic characteristic data storage unit 17.
Also in this case, the transfer function can be obtained by dividing the collected sound data
(response signal) by the sound data (input signal).
Note that the room acoustic characteristic data storage unit 17 can also store room acoustic
characteristics of a typical studio in advance.
[0057]
Then, in the playback apparatus 1 of the present embodiment configured as described above, the
room acoustic characteristics of the studio are measured, and the measured acoustic
characteristics of the studio and the acoustic characteristics of the metadata recorded in the
recording medium are measured. The reproduction characteristic adjustment unit 7 adjusts the
acoustic characteristic of the audio data reproduced from the audio data input unit 2.
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[0058]
In this way, in the playback device 1 of the present embodiment, the sound when playing back
the audio signal according to the room acoustics characteristics of the studio and the acoustic
characteristics when the audio signal of the music source to be played back is recorded. It is
possible to adjust the characteristics.
[0059]
As a result, even in the case where the reproduction apparatus 1 reproduces a music source
having a different recording environment or genre, the user can automatically adjust and
reproduce the sound characteristic suitable for the music source without adjusting the acoustic
characteristic. It will be possible.
[0060]
Here, acoustic characteristics that the studio influences the sound image will be described.
The structure of the studio that influences the acoustic characteristics is, for example, the leftright asymmetry of the acoustic space.
An example of such a studio is shown in FIG.
[0061]
In the studio 20 shown in FIG. 4, the right wall 21R has higher sound absorption than the left
wall 21L of the listener U, and almost no reflected sound from the right wall 21R.
That is, the state of reflection is largely different between the left wall surface 21L and the right
wall surface 21R.
[0062]
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In this case, a sound reaching the listener U from the left speaker 12L disposed on the left front
of the listener U and a sound reaching the listener U from the right speaker 12R disposed on the
right front of the listener U In comparison, the direct sounds SDL and SDR reaching the listener U
from the speakers 12L and 12R are substantially the same, but the reflected sounds SRL and SRR
reflected by the left and right wall surfaces 21L and 21R are largely different.
As a result, the sound image 22 such as a vocal or a main instrument, which should normally be
localized at approximately the center position of the left and right speakers 12L and 12R, is
shifted in the direction of large reflected sound (in this case, left) or The sound image of the
studio 20 may be affected, for example, only the sound of the sound may be noticeable.
[0063]
Therefore, in the reproduction apparatus 1 of the present embodiment, the reproduction
characteristic adjustment unit 7 is configured as shown in FIG. 5 to adjust audio data.
[0064]
The reproduction characteristic adjustment unit 7 shown in FIG. 5 is configured by the pseudo
reflected sound addition circuit 23 and the inter-channel level difference adjustment circuit 24.
When there is almost no reflection from the right wall 21R of the studio 20, the right speaker
12R After the pseudo-reflected sound data is added to the sound data output from the pseudoreflected sound adding circuit 23, the inter-channel level difference adjusting circuit 24 adjusts
the level difference between the left and right channels and outputs it.
[0065]
With such a configuration, even when there is almost no reflected sound SRR from the right wall
surface 21R of the studio 20, the sound image 22 such as vocals is substantially at the center
position of the left and right speakers 12L and 12R by the pseudo reflected sound SRR1 from the
right speaker 12R It will be possible to position it.
[0066]
Further, if the pseudo reverberation addition circuit 25 for adding pseudo reverberation data as
shown by the broken line is provided to the reproduction characteristic adjustment unit 7, and
the pseudo reverberation is added to the reproduction sound of the right speaker 12R, The sound
image 22 such as vocal can be localized more naturally.
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[0067]
The reproduction characteristic adjustment unit 7 can also be configured as shown in FIG.
[0068]
The reproduction characteristic adjustment unit 7 shown in FIG. 6 includes a canceling filter 51
and a pseudo reflected sound addition circuit 23. In the canceling filter 51, the reproduction
sound from the left and right speakers 12L and 12R of the studio 20 is canceled. It is made to
add acoustic characteristics, such as a reflected sound desired from.
That is, after the inverse characteristic is applied so that the characteristic from the speakers 12L
and 12R to the listening position becomes a flat frequency characteristic, the acoustic
characteristic of the desired reflected sound is added in the pseudo reflected sound addition
circuit 23.
[0069]
With this configuration, even when there is almost no reflected sound SRR from the right wall
21R of the studio 20, the left and right speakers 12L and 12R are generated by the pseudo
reflected sound SRL1 from the left speaker 12L and the pseudo reflected sound SRR1 from the
right speaker 12R. It is possible to localize the sound image 22 such as vocals with a sense of
expansion at approximately the center position of the.
[0070]
Also in this case, a pseudo reverberation addition circuit 25 for adding pseudo reverberation data
as shown by a broken line is provided to the reproduction characteristic adjustment unit 7, and
the reproduction sound output from the left and right speakers 12L and 12R is provided. If
pseudo reverberation is added, the sound image 22 can be localized more naturally.
[0071]
Here, the canceling filter 51 as described above will be described with reference to FIG.
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In FIG. 7, the head diffraction transfer function of the path from the left speaker 67 to the left ear
EL of the listener U in the reproduction sound field space 69 is HLS, and the path from the right
speaker 68 to the right ear ER of the listener U Let the head diffraction transfer function be HRS.
The head diffraction transfer function of the path from the left speaker 67 to the right ear ER of
the listener U is HLO, and the head diffraction transfer function of the path from the right
speaker 68 to the left ear EL of the listener U is HRO.
[0072]
In the canceling filter 51 shown in FIG. 7, the left sound collection signal SLin from the dummy
head microphone not shown in the drawing is input as the left channel signal, and the right
sound collection signal SRin is input as the right channel signal.
[0073]
The left sound collection signal SLin, which is a left channel signal, is input to the adder 61 and
the crosstalk cancellation unit 62.
The right sound collection signal SRin, which is a right channel signal, is input to the adder 64
and the crosstalk cancellation unit 63.
[0074]
The crosstalk cancellation units 62 and 63 are filters for canceling a crosstalk component from
the left speaker 67 to the right ear ER of the listener U and a crosstalk component from the right
speaker 68 to the left ear EL of the listener U, respectively. It is assumed.
In this case, the transfer characteristic CR of the crosstalk cancellation unit 62 is indicated as HRO / HRS.
Further, the transfer characteristic CL of the crosstalk cancellation unit 63 is indicated as -HLO /
HLS.
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[0075]
Then, the left sound collection signal SLin that has passed through such a crosstalk cancellation
unit 62 is input to the adder 64 as a cancellation signal.
In addition, the right sound collection signal SRin that has passed through the crosstalk
cancellation unit 63 is input to the adder 61 as a cancellation signal.
[0076]
The adder 61 adds the input left sound collection signal SLin and the cancellation signal from the
crosstalk cancellation unit 63 and outputs the result.
The output of such an adder 61 is supplied to the correction block unit 65.
[0077]
The adder 64 adds the input right sound collection signal SRin and the cancellation signal from
the crosstalk cancellation unit 62 and supplies the result to the correction block unit 66.
[0078]
The correction block unit 65 is a block unit for performing correction of the reproduction system
including the left speaker 67 for the left channel, and includes a correction unit 65a for
correcting a change in the characteristic caused by the crosstalk cancellation unit 63 and a
speaker characteristic. It is comprised by the speaker correction | amendment part 65b which
correct | amends.
The transfer characteristic of such a correction unit 65a is indicated as 1 / (1-CL · CR).
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Also, the transfer characteristic of the correction unit 65b is indicated as 1 / HLS.
The output of such a correction block unit 65 is output from the canceling filter 51 as the left
sound collection signal SLout.
[0079]
Further, the correction block unit 66 is a block unit for performing correction of the
reproduction system including the right speaker 68 for the right channel, and a correction unit
66a for correcting the change of the characteristic caused by the crosstalk cancellation unit 62; It
is comprised by the speaker correction part 66b which correct | amends a characteristic.
The transfer characteristic of such a correction unit 66a is shown as 1 / (1-CL · CR).
Further, the transfer characteristic of the correction unit 66b is indicated as 1 / HRS.
The output of such a correction block unit 66 is output from the canceling filter 51 as the right
sound collection signal SRout.
[0080]
Then, the left sound collection signal SLout output from the canceling filter 51 is input to the left
speaker 67 of the reproduction sound field space 69, and the right sound collection signal SRout
is input to the right speaker 68 of the reproduction sound space 69.
Then, only the left ear sound corresponding to the left sound collection signal SLin input to the
canceling filter 51 can be reproduced to the left ear EL of the listener U in the reproduction
sound field space.
Further, only the right ear sound corresponding to the right sound collection signal SRin input to
the canceling filter 51 can be reproduced on the right ear ER of the listener U.
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[0081]
By the way, in the reproducing apparatus 1 of the present embodiment, although the audio data
of the recording medium and the metadata indicating the property of the space to be the target
of the reproduction of the audio data are recorded as described above, Such metadata need not
necessarily be recorded on the recording medium.
[0082]
For example, it is also possible to record a content identification code on a recording medium and
to record metadata corresponding to the content identification code in a database or the like on a
network.
[0083]
Therefore, next, as another configuration of the reproducing apparatus according to the present
embodiment, a reproducing apparatus suitable when metadata corresponding to the content
identification code recorded in the recording medium is recorded in a database or the like on the
network. Will be explained.
FIG. 8 is a block diagram showing the configuration of such a playback apparatus.
The same parts as those of the reproducing apparatus 1 shown in FIG. Further, in FIG. 8, the
content identification code detection unit 31 is configured to detect the content identification
code recorded in the recording medium from the audio data output from the audio data input
unit 2.
[0084]
The database search unit 32 reads out metadata corresponding to the content identification code
from the database based on the content identification code detected by the content identification
code detection unit 31.
[0085]
For example, when the content identification code is already stored together with the metadata in
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the database storage unit 33 in the reproduction device 30, the database search unit 32 reads
out the corresponding metadata from the database storage unit 33. .
[0086]
On the other hand, when not stored in the database storage unit 33, the network access unit 34
is controlled to read out metadata corresponding to the content identification code from the
database on the network 35, and the metadata together with the content identification code It is
stored in the database storage unit 33.
[0087]
The audio data analysis unit 36 analyzes the metadata retrieved from the database by the
database search unit 32 to determine the acoustic characteristics of the studio suitable for
reproducing the audio data of the recording medium.
[0088]
Also in such a reproducing device 30, the acoustic characteristics of the reproduced audio data
can be adjusted based on the room acoustic characteristics of the studio 20 and the metadata
corresponding to the audio data recorded in the recording medium. As described above, even in
the case where a music source having a different recording environment or genre is played back
in a studio, it is possible to automatically adjust and play back to the acoustic characteristics
suitable for the music source.
[0089]
The content identification code for identifying audio data and the like recorded on the recording
medium does not have to be recorded to identify the content, and, for example, it is possible to
use TOC data of a compact disc or music signal data. It is also possible to use, as a content
identification code, one having a very small probability that the same numerical value
combination exists, as in a part.
[0090]
Here, a reproduction system configured by using a plurality of reproduction apparatuses 30
shown in FIG. 8 will be described.
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The playback system is called a studio (hereinafter referred to as the first studio.
) And a place different from the studio (hereinafter referred to as the second studio).
) Are connected to each other via a network, respectively.
Also, it is assumed that one performer in the first studio and another performer in the second
studio have a session in real time using the reproduction system.
[0091]
The playback device 30 disposed in the first studio (hereinafter referred to as the first playback
device).
) Collects the performance by the player, and transmits the collected sound data to the second
studio via the network.
On the other hand, the playback device 30 disposed in the second studio (hereinafter referred to
as a second playback device). ) Collects the performance by the player, and transmits the
collected acoustic data to the first studio via the network.
[0092]
In the first reproduction device, the sound data supplied from the second reproduction device is
supplied to the reproduction characteristic adjustment unit 7 through the audio data
reproduction unit 2. Also, the audio characteristics of the second studio supplied from the second
reproduction device are supplied to the audio data analysis unit 36. The first reproduction
apparatus may detect the acoustic characteristic of the second studio from the database storage
unit 33 or may detect it from the network via the network access unit 34.
[0093]
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23
The first reproduction device is based on the acoustic characteristic of the second studio supplied
from the changeover switch 5 by the reproduction characteristic control unit 6 and the acoustic
characteristic of the first studio supplied via the changeover switch 18. The reproduction
characteristic adjustment unit 7 is controlled. The reproduction characteristic control unit 6
converts the acoustic characteristic of the first studio into an inverse characteristic and supplies
the inverse characteristic to the reproduction characteristic adjustment unit 7. Also, the
reproduction characteristic control unit 6 generates pseudo reflection sound and / or pseudo
reverberation sound based on the acoustic characteristic of the second studio, and supplies the
pseudo reflection sound and the pseudo reverberation sound to the reproduction characteristic
adjustment unit 7.
[0094]
The reproduction characteristic adjustment unit 7 adjusts the acoustic data collected by the
second studio supplied from the audio data reproduction unit 2 based on the acoustic
characteristic of the inverse characteristic of the first studio, and the adjustment after the
adjustment. The pseudo reflection sound and / or pseudo reverberation sound supplied from the
reproduction characteristic control unit 6 is added to the sound data. The sound data output
from the reproduction characteristic adjustment unit 7 is output to the first studio via the switch
9, the D / A converter 10, the power amplifier 11, and the speaker system 12.
[0095]
Thus, in the first studio, the acoustic characteristics of the first studio are canceled and acoustic
data is output according to the acoustic characteristics of the second studio. Therefore, the
performer of the first studio can obtain a LIVE feeling as if he / she is playing with another
performer playing in the second studio in the second studio.
[0096]
In addition, the second reproduction device disposed in the second studio also processes the
acoustic data supplied from the first studio as described above. Therefore, the performer of the
second studio can obtain the LIVE feeling as if he / she is playing with the other performer
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24
playing in the first studio in the first studio.
[0097]
Therefore, in the reproduction system including the reproduction apparatus according to the
present invention, since the sound and sound field characteristics of one studio can be mutually
exchanged with the sound and sound field characteristics of the other studio, for each
performance, It is possible to provide a LIVE-like sound / sound field space as if playing together
at the same place.
[0098]
Also, the playback system may be configured to exchange the acoustic characteristics of the third
studio with the acoustic characteristics of the first studio, and exchange the acoustic
characteristics of the third studio with the acoustic characteristics of the second studio. good.
In such a configuration, the performer of the first studio and the performer of the second studio
can obtain a LIVE feeling as if they are playing together in the third studio.
[0099]
FIG. 9 is a block diagram showing still another configuration of the playback apparatus according
to the present embodiment. The same parts as those of the reproducing apparatus shown in FIG.
1 and FIG.
[0100]
In the reproduction apparatus 40 shown in FIG. 9, the sound data analysis unit 36 will play the
sound space or the sound data in which the nature of the sound data reproduced by the sound
data input unit 2 and the sound data are recorded. It is made to analyze the room acoustical
characteristics of the virtual acoustic space.
[0101]
For example, the timing and magnitude of the reflected sound are analyzed from the shape of the
autocorrelation function of the audio signal and the shape of the cepstrum, and the spread of the
08-05-2019
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sound image is analyzed from the cross correlation function between channels.
[0102]
At this time, it is preferable that the audio data analysis unit 36 be provided with a band division
filter function so as to analyze the structure of the reflected sound by dividing it into frequency
bands when analyzing audio data.
[0103]
Further, the analysis result of the audio data analysis unit 36 may be stored in the audio
characteristic data storage unit 4 for each content identification code, for example, and may be
called up each time a content is selected.
[0104]
Also in such a reproduction device 40, the acoustic characteristics of the reproduced audio data
are adjusted based on the room acoustic characteristics of the studio 20 and the acoustic
characteristics of the audio data obtained from the audio data recorded in the recording medium.
Thus, as described above, even in the case where a music source having a different recording
environment or genre is played back in the studio, it is possible to automatically adjust and play
back to the acoustic characteristics suitable for the music source.
[0105]
The configuration of the reproduction apparatus described above is merely an example, and the
reproduction apparatus adjusts the acoustic characteristics based on the acoustic characteristics
of the reproduction data to be reproduced from the recording medium and the indoor acoustic
characteristics of the studio. Any configuration may be applicable if it is.
[0106]
Also, in the present embodiment, the recording medium has been described as an optical disc,
but this is merely an example, and a Blu-Ray (disc), a CD (Compact Disc) disc, a Mini Disc, for
example , HDD (Hard Disk Drive), or a memory card such as a flash memory.
[0107]
FIG. 1 is a block diagram showing the configuration of a playback apparatus according to an
08-05-2019
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embodiment of the present invention.
FIG. 6 is a diagram showing parameters indicating the nature of a reproduction sound field space
recorded as metadata on a recording medium.
It is a figure which shows the principal part which measures the acoustic characteristic provided
in the reproducing | regenerating apparatus made into this Embodiment.
It is a figure showing an example of a studio.
It is a figure showing an example of composition of a reproduction characteristic adjustment
part.
It is a figure showing other examples of composition of a reproduction characteristic adjustment
part.
It is a figure showing an example of composition of a canceling filter.
It is the block diagram which showed the other structure of the reproducing | regenerating
apparatus made into this Embodiment. It is the block diagram which showed the further another
structure of the reproducing | regenerating apparatus made into this Embodiment.
Explanation of sign
[0108]
1, 30, 40 playback apparatus, 2 audio data playback unit, 3 metadata analysis unit, 4 acoustic
characteristic data storage unit, 5, 8, 9, 18 selector switch, 6 playback characteristic control unit,
7 playback characteristic adjustment unit, 10 D / A conversion unit, 11 power amplification unit,
12 speaker system, 13 microphone system, 14 microphone amplification unit, 15 A / D
conversion unit, 16 room acoustic characteristic analysis unit, 17 room acoustic characteristic
storage unit, 19 room acoustic characteristic measurement Data storage unit, 20 studios, 23
artificial reflection addition circuits, 24 level difference adjustment circuits among 24 channels,
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25 pseudo reverberation addition circuits, 31 content identification code detection units, 32
database search units, 33 database storage units, 34 network access units Parts, 35 networks, 36
voice data analysis parts, 51 canceling filters
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