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JP2004312484

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DESCRIPTION JP2004312484
An object of the present invention is to make it possible to effectively utilize all of connected
speakers without impairing a supplied audio signal. SOLUTION: A provision of conversion
information determined according to a channel configuration and an output channel
configuration of an input audio signal is received from a control unit, and this conversion
information is set in each amplifier constituting the channel conversion unit 3, and an extension
unit The cooperation of the downmixing unit 31 and the downmixing unit 32 forms an audio
signal for each output channel according to the output channel configuration from the audio
signal of each channel of the input audio signal, and outputs it to each output channel. [Selected
figure] Figure 2
Acoustic converter and acoustic conversion method
The present invention relates to an acoustic conversion device and an acoustic conversion
method for processing audio signals of various channel configurations such as monaural audio
signals, 2-channel audio signals, multi-channel audio signals and the like. [0002] CD-DA
(Compact Disc Digital Audio), which is a general music CD, and SACD (Super Audio Compact),
which is a next-generation music CD, are widely used as a music source supply source. Disc). The
CD-DA is a PCM (Pulse Code Modulation) PCM digital audio signal (CD audio signal) with a
sampling frequency of 44.1 kHz and a quantization bit number of 16 bits. The SACD has a twolayer structure in which the so-called CD audio signal described above is recorded in the upper
layer, and an ultra-high-fidelity DSD (Direct Stream Digital) audio signal is recorded in the lower
layer. As described above, CD-DA and SACD have different signal formats, as in CD audio signal
and DSD audio signal, but SACD has a two-layer structure, so that it is completely bidirectional.
Compatibility is maintained. Then, by using the SACD player, when playing back a CD-DA, an
analog 2-channel audio signal is output to the analog 2-channel output terminal, and when
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playing an SACD, an analog multi-voice signal is output to the analog multi-output terminal Be
able to do that. However, in the conventional audio amplifier apparatus to which the SACD player
is connected, whether to reproduce the analog two-channel audio signal output from the analog
two-channel output terminal of the SACD player or output from the analog multiple output
terminal of the SACD player Since the user has to be made to switch whether to play the analog
multi-voice signal, it may be inconvenient especially for a user who is not familiar with the
operation of the audio device. In order to solve such a problem, according to Patent Document 1
(Japanese Patent Application Laid-Open No. 2002-354574), an audio signal of which format is
selected out of a plurality of audio signals of different signal formats supplied to its own device. A
technique is disclosed for automatically selecting an audio signal to determine whether it has
been supplied and to reproduce the supplied audio signal.
According to the technique described in this patent document 1, the audio signal to be
reproduced is automatically selected so as to reproduce the audio signal supplied to the own
device without bothering the user. Therefore, even a user who is not familiar with the operation
of the audio device can quickly and smoothly listen to the reproduced audio of the audio signal
recorded on the CD-DA or SACD. [Patent Document 1] Japanese Patent Application Laid-Open No.
2002-354574. [0008] By the way, as in the above-described SACD player, audio signals of
different formats are output from different output terminals. Instead, various audio signals of
different formats are often output as digital data through the same path. Recently, audio streams
of various so-called multi-channel formats such as Dolby Digital (Dolby Digital (registered
trademark)) and dts (Digital Theater System (registered trademark)) have been widely used. .
There are various multi-channel formats in addition to those described above, and there are also
various channel configurations of audio signals. Here, let n be the number of channels of the
speaker disposed on the front side (front side) of the listener, m be the number of channels of the
speaker disposed on the rear side (rear side) of the listener, and When the configuration is
expressed as [n / m], [1/0], [2/0], [2/1], [2/2], [3/0], [3/1], [[1/1] Various channel configurations
such as 3/2] and [3/3] may be adopted. In this case, [1/0] indicates that the channel
configuration is only the center channel (so-called monaural configuration), and [2/0] is that the
channel configuration is only the front 2 channels (so-called stereo configuration) It shows that it
is). [* / 1] indicates that the rear channel is monaural, but generally the rear output is mostly 0
channel (no rear speaker) or 2 channels or more. As described above, the channel configuration
of the audio signal to be reproduced may be various. And the setting state (output channel
configuration) of the speaker of the audio device for multi-channel reproduction used by the user
is the same as the case described above [front side (front side) channel number n / rear side (rear
side) channel In many meters, there are many cases, such as [2/0], [3/0], [2/2], [3/2], [3/3], and
[3/4]. .
Accordingly, the channel configuration of the audio signal to be reproduced and the
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configuration (output channel configuration) of the channel to which the speaker of the user's
audio device is connected do not necessarily match. For this reason, regardless of the connection
state of the speakers, there may be speakers that do not sound at all depending on the stream.
For example, when an audio device whose channel configuration is [2/0] is to be played back by
an audio device whose output channel configuration is [3/2], from speakers of channels other
than the front two channels There is no sound at all, and the center and rear speakers are
wasted. In addition, having a speaker that does not emit sound may be mistaken for failure of the
audio device. In view of the above, the present invention makes it possible to effectively utilize all
of the connected speakers, and to avoid damaging the supplied audio signal and the acoustic
converter. The purpose is to provide a conversion method. SUMMARY OF THE INVENTION In
order to solve the above-mentioned problems, the acoustic conversion device of the invention
according to claim 1 is characterized in that: conversion information determined by the channel
configuration of the input voice signal and the output channel configuration of its own device
And forming means for forming an audio signal of each output channel corresponding to the
output channel configuration from the audio signal of each channel of the input audio signal
based on the conversion information. According to the acoustic conversion device of the present
invention, the conversion information determined in accordance with the channel configuration
of the input audio signal and the output channel configuration is provided, and based on the
conversion information, From the audio signal of each channel, an audio signal for each output
channel corresponding to the output channel configuration is formed. Thus, regardless of the
channel configuration of the input audio signal to be supplied, and regardless of the output
channel configuration which is the configuration of the channel to which the speaker of the audio
device to be used is connected, An audio signal for the output channel is formed. Therefore, while
being able to utilize an input sound signal effectively, a speaker can be used without waste. In
addition, it is possible to prevent the occurrence of inconveniences such as mistake with the
failure of the audio device due to the generation of the speaker that does not emit sound.
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of an apparatus
and method according to the present invention will be described with reference to the drawings.
In the embodiments described below, an embodiment of an apparatus and method according to
the present invention will be described as an example applied to an audio amplifier apparatus.
[Summary of Functions of Audio Amplifier Device] The audio amplifier device of the embodiment
described below has a total of seven channels on the front side (front side) and four channels on
the rear side (rear side) as output channels. It is equipped with a channel. However, it is not
necessary to use all the output channels, and it is possible to connect speakers to any output
channel according to the preference of the user. That is, in the audio amplifier device of this
embodiment, as an output channel configuration which is a configuration of an output channel to
which a speaker is actually connected, when expressed by [front side channel n / back side
channel number m], Arbitrary output channel configurations such as [2/0], [3/0], [2/2], [3/2],
[3/3], and [3/4] can be taken. It is However, the input audio signal (digital audio stream in this
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embodiment) supplied to the audio amplifier device of this embodiment is assumed to be in
various formats such as PCM, Dolby Digital, dts, etc. Since the channel configuration may be
various, the channel configuration of the input audio signal may not match the output channel
configuration. Therefore, in the audio amplifier device of this embodiment, how is it based on the
channel configuration of the input audio signal and the output channel configuration which is the
configuration of the output channel of the own device to which the speaker is actually connected.
Even when an input audio signal having a proper channel configuration is supplied, it is possible
to form an output audio signal for each of the output channels conforming to the output channel
configuration of the own machine from the input audio signal. It is. In other words, by
performing channel conversion on the input audio signal, an output audio signal conforming to
the output channel configuration of the own device can be formed. [Configuration and Operation
of Audio Amplifier Device] FIG. 1 is a block diagram for explaining an audio amplifier device of
this embodiment to which an embodiment of the device and method according to the present
invention is applied.
As shown in FIG. 1, the audio amplifier device of this embodiment includes an input terminal 1
for digital audio signals, an audio data decoding unit 2, a channel conversion unit 3, a speaker
unit 4 corresponding to multi audio channels, a control unit 5, A key operation unit 6 is provided.
As shown in FIG. 1, the control unit 5 includes a central processing unit (CPU) 51, a read only
memory (ROM) 52, a random access memory (RAM) 53, and a non-volatile memory 54 through
the system bus 55. It is a microcomputer connected and comprised, and can control each part of
the audio amplifier apparatus of this embodiment. Here, the ROM 52 stores various programs to
be executed according to the audio amplifier device of this embodiment, data necessary for
processing, and the like, and the RAM 53 holds an intermediate result of the processing. Are
mainly used as work areas. The nonvolatile memory can hold stored information even when the
power is turned off. For example, setting parameters and the like are stored and held. The digital
audio signal (audio stream) supplied from various digital devices, such as a CD (Compact Disc)
player and a DVD (Digital Versatile Disc) player, received through the input terminal 1 is decoded
as audio data. It is supplied to part 2. The audio data decoding unit 2 operates according to the
control from the control unit 5 and decodes a digital audio stream of a predetermined format,
which is an input audio signal supplied thereto, according to the format, The signal channel
configuration is determined, and the decoded audio signal of each channel according to the
channel configuration is separated. Then, the audio data decoding unit 2 uses the information
indicating the determined channel configuration of the input audio signal and the decoded audio
signal separated for each channel according to the channel configuration of the input audio
signal. The data is supplied to the conversion unit 3. The audio data decoding unit 2 can be
realized by using various types of integrated circuits (ICs). For example, model numbers
MB86347, MB86349, MB86D42, MB86D41, etc., which are ICs manufactured by Fujitsu Ltd.,
can be used as the audio data decoding unit 2.
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These ICs decode digital audio streams of signal formats such as PCM, Dolby Digital, dts, and
AAC (Advanced Audio Coding), and audio signals after decoding channels corresponding to the
channel configuration of the digital audio stream. (Voice data) can be output. The channel
conversion unit 3 is configured as a DSP (Digital Signal Processor) in this embodiment, and the
information indicating the channel configuration of the input audio signal determined by the
audio data decoding unit 2 Supply of conversion information determined from the control unit 5
according to the two information with the output channel configuration of the device, and based
on the conversion information, the audio signal of each channel supplied from the audio data
decoding unit 2 (input audio Signal) form an output audio signal to be sent to each output
channel to which the speaker is connected. Specifically, as described above, the channel
conversion unit 3 receives the information indicating the channel configuration of the input
audio signal from the audio data decoding unit 2 and the audio of each channel according to the
channel configuration of the input audio signal. Receive a supply of signals. Then, information
indicating the channel configuration of the input audio signal is supplied to the control unit 5,
and the control unit 5 is requested to provide conversion information used for channel
conversion. Control unit 5 receives the configuration of the output channel to which the speaker
is connected, that is, the setting information on the output channel configuration through key
operation unit 6, and the received setting information on the output channel configuration is
nonvolatile memory 54 I keep in memory. Further, for example, the non-volatile memory 54
stores and holds a plurality of conversion information to be supplied to the channel conversion
unit 3 which is determined based on the channel configuration and output channel configuration
of the input audio signal. The control unit 5 is based on the information indicating the channel
configuration of the input audio signal provided through the channel conversion unit 3 and the
setting information indicating the own output channel configuration held in the non-volatile
memory 54. The target conversion information is acquired from the plurality of conversion
information held in the non-volatile memory 54, and is supplied to the channel conversion unit 3.
Then, the channel conversion unit 3 performs conversion processing based on conversion
information from the control unit 5 on the input audio signal of each channel from the audio data
decoding unit 2 according to the output channel configuration of its own device. An output audio
signal for each output channel is formed, and the formed output audio signal is supplied to a
speaker connected to the corresponding output channel.
As described above, the audio amplifier device of this embodiment can have an arbitrary output
channel configuration within the range of 7 channels at maximum, and as the configuration of
the speaker unit 4, the output channel configuration Corresponding to [front side channel n /
rear side channel number m], [2/0], [3/0], [2/2], [3/2], [3/3] , [3/4], etc. can be used. Of course,
other than this, it is also possible to adopt a configuration such as [1/0], [2/1], and [3/1] which is
not usually used very often. And, the audio amplifier device of this embodiment, even if the
channel configuration of the input audio signal and the output channel configuration which is the
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configuration of the output channel to which the speaker is connected do not match, the output
of the own device An output audio signal for each output channel corresponding to the channel
configuration is formed, and can be output to each output channel to which a speaker is
connected according to the output channel configuration. By doing this, even if the channel
configuration of the input audio signal is different from the output channel configuration which
is the configuration of the output channel to which the speaker is connected, a speaker which
does not emit sound is generated. In this way, problems such as not using the input voice signal
efficiently can be avoided. In the present embodiment, the channel conversion unit 3 corresponds
to a forming unit that forms an audio signal of the output channel, and the non-volatile memory
54 corresponds to a storage unit that stores conversion information. The decoding unit 2
corresponds to determination means for determining the channel configuration of the input
audio signal. Further, the control unit 5 and the non-volatile memory 54 constitute a grasping
means for grasping the output channel configuration. [Regarding Configuration and Operation of
Channel Conversion Unit] Next, a specific configuration example of the channel conversion unit 3
of this embodiment will be described. FIG. 2 is a diagram for explaining the function of the
channel conversion unit 3 configured as a DSP. The channel conversion unit 3 of this
embodiment is roughly divided into an extension unit 31 and a downmix unit 32. The extension
unit 31 distributes or mixes the audio signals of the respective channels to which the audio
signal is supplied, thereby forming the audio signals of the number of channels equal to or more
than the number of channels to which the audio is supplied. Is a part to realize the extension
function.
Further, the downmixing unit 32 mixes the audio signals of the respective channels to which the
audio signal is supplied to form the audio signals of the number of channels equal to or less than
the number of channels to which the audio is supplied. It is the part that realizes the mix function
(Downmix). As shown in FIG. 2, the extension unit 31 has a left front channel (left front channel)
L, a center channel C, a right front channel (right front channel) R, a left rear channel (left
surround channel) SL, a right There are six input terminals respectively corresponding to the rear
channel (right surround channel) SR and the left rear sub-channel (left surround back channel)
SBL. In general, the left front channel L is a channel of an audio signal supplied to a speaker
disposed on the left front of the listener, and the right front channel R is disposed on the speaker
disposed on the right front of the listener The center channel C is a channel of the audio signal to
be supplied, and the channel of the audio signal to be supplied to a speaker disposed in front of
the listener. The left rear channel SL is a channel of an audio signal supplied to a speaker
disposed on the left rear of the listener, and the right rear channel SR is applied to a speaker
disposed on the right rear of the listener It is a channel of audio signal. Also, originally, the left
rear sub-channel SBL is a channel of an audio signal supplied to a speaker arranged on the left
rear of the listener, and is a channel of an audio signal supplied to a speaker arranged on the
right rear of the listener The right rear sub-channel SBR is used as a pair. In this embodiment, the
left rear sub-channel SBL may be used as a rear center channel in this embodiment as will be
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described later. In addition, each channel of the extension unit 31 is provided with functions of
mixers (mixers) 11 to 17. That is, as shown in FIG. 2, in the extension unit 31, the left front
channel L, the center channel C, the right front channel R, the left rear channel SL, the right rear
channel SR, and the left rear subchannel SBL correspond to each other. One mixer 11, mixer 12,
mixer 13, mixer 14, mixer 15 and mixer 16 are provided, and a mixer 17 is provided for the
newly formed right rear sub-channel SBR. I have to.
The function of a variable amplifier (amplifier) is provided between each input terminal and each
mixer, if necessary. That is, as shown in FIG. 2, between the input terminal of the center channel
C and each of the mixers 11, 13, 14, 15, 16 and 17, one amplifier KCL, KCR, KCSL, corresponding
to each. KCSR, KCBL and KCBR are provided. Further, between the input terminal of the left front
channel L and each of the mixers 12, 14, 16, one amplifier KCL, KLSL, KLBL corresponding to
each is provided, and the right front channel A corresponding one amplifier KRC, KRSR, KRBR is
provided between the input terminal of R and each of the mixers 12, 15, 17. An amplifier KSLBL
is provided between the input terminal of the left rear channel SL and the mixer 16, and an
amplifier KSRBR is provided between the input terminal of the right rear channel SR and the
mixer 17. Is provided, and an amplifier KBLBR is provided between the input terminal of the left
rear subchannel SBR and the mixer 17. As described above, the extension unit 31 of this
embodiment has input terminals for six channels, and has functions of seven mixers and
functions of fifteen amplifiers. The center channel C, the front right channel R, the rear left
channel SL, the rear right channel SR, the rear left subchannel SBL, and the rear left subchannel
SBR have outputs for seven channels. Further, in this embodiment, the downmixing unit 32 is
provided at the rear stage of the extension unit 31 and corresponds to the seven output channels
of the extension unit 31. The left front channel L, the center channel C, and the right front Audio
signals of channel R, left rear channel SL, right rear channel SR, left rear subchannel SBR, and
right rear subchannel SBR can be supplied. In addition, seven output terminals are provided
corresponding to each channel. In the downmix unit 32, as shown in FIG. 2, the functions of the
mixers 21 to 24 are provided. That is, as shown in FIG. 2, the mixer 21 is provided at the front
stage of the output terminal of the left front channel L, the mixer 22 is provided at the front
stage of the output terminal of the right front channel R, and the front stage of the output
terminal of the left rear channel SL. A mixer 23 is provided in front of the output terminal of the
right rear channel SR, and a mixer 24 is provided in front of the output terminal of the right rear
channel SR.
In addition, in the downmix unit 32, the function of the variable amplifier is provided as
necessary. That is, as shown in FIG. 2, the amplifier Kf is provided at the front stage of each of
the mixers 21 and 22, and the amplifier Kc is provided at the front stage of the output terminal
of the center channel C. Further, an amplifier Ks is provided at the front stage of each of the
mixers 23 and 24, and an amplifier Kb is provided at the front stage of each output terminal of
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the left rear subchannel SBR and the right rear subchannel SBR. Furthermore, as shown in FIG. 2,
between the input end of the right rear subchannel SBR in the downmix unit 32 and each of the
mixers 22 and 24, one amplifier Kbrfr, Kbrsr corresponding to each is provided. It is made to
provide. In addition, one amplifier Kblfl, Kblfr, Kblsl, Kblsr corresponding to each is provided
between the input end of the left rear sub-channel SBL and each of the mixers 21, 22, 23, 24 in
the downmix unit 32. I have to. Further, as shown in FIG. 2, between the input end of the right
rear channel SR in the downmix unit 32 and the mixer 22, and the input end of the left rear
channel SL in the downmix unit 32, and the mixer 21. An amplifier Ksf is provided in each of the
two, and one amplifier Kcf is provided between the input end of the center channel C in the
downmix unit 32 and the mixers 21 and 22. ing. As described above, the downmix unit 32 of this
embodiment has seven channels of input terminals for receiving signals from the extension unit
31, the functions of four mixers, and the functions of sixteen amplifiers. And includes output
terminals for seven channels of left front channel L, center channel C, right front channel R, left
back channel SL, right back channel SR, left back sub channel SBL, and right back sub channel
SBR. . Then, each amplifier of the extension unit 31 and the downmix unit 32 sets an
amplification factor for each amplifier according to the conversion information from the control
unit, thereby providing a signal of an audio signal supplied thereto. The level is made to be
adjustable. Then, in each mixer, the audio signal supplied thereto is mixed and output.
The process in each amplifier is specifically as follows. That is, in the amplifier in which 0 (zero)
is set as the amplification coefficient, since the coefficient is 0, the signal level of the audio signal
to be output is 0 (zero), and as a result, the audio signal is not output. Further, in the amplifier in
which 1 is set as the amplification coefficient, since the coefficient is 1, the supplied audio signal
is output with the supplied signal level. Further, in the amplifier in which a value larger than 0
(zero) is set as an amplification factor, an audio signal of a signal level corresponding to the value
is output. By the functions of the extension unit 31 and the downmix unit 32 configured as
described above, the channel conversion unit 3 of this embodiment has its own channel
configuration regardless of the input audio signal channel configuration. Depending on the
output channel configuration of the machine, it is possible to form an audio signal for each of the
output channels to be used. [Regarding Channel Conversion Patterns] The channel conversion
unit 3 of this embodiment is configured to be able to perform channel conversion of at least 48
patterns as described below. 3 to 6 are diagrams for explaining channel conversion patterns that
can be performed in the channel conversion unit 3 of this embodiment. Also in FIGS. 3 to 6, the
channel configuration and the output channel configuration of the input audio signal are shown
by [front side channel n / back side channel number m]. Also, in each column of FIG. 3 to FIG. 6,
the large squares in which the letters L, C, R, SL, SR, BL, BR are written indicate the speakers
connected to the corresponding output channels. There is. That is, the letter L is a left front
channel L speaker, the letter C is a center channel C speaker, the letter R is a right front channel
R speaker, the letter SL is a left rear channel SL speaker, the letter SR Shows the speaker of the
right rear channel SR, the letter BL shows the speaker of the left rear subchannel SBL, and the
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letter BR shows the speaker of the right rear subchannel SBR. The hatched squares indicate
channels in which the input audio signal is present. For example, as shown in the lower right
column of FIG. 3, characters SL and SR are hatched, and a portion not enclosed by a square is not
a channel to which a speaker is connected, but there is an input audio signal. Shows the channel
to be
Further, solid arrows indicate extension processing, and dotted arrows indicate downmix
processing. Then, FIG. 3 converts input audio signals having channel configurations of [1/0],
[2/0], and [2/2], and outputs output channel configurations of [3/4] and [3/4]. It is a figure
which shows the pattern in the case of forming the signal which is 3/3], [3/2], and [3/0]. Also,
FIG. 4 converts input audio signals having channel configurations [1/0], [2/0], and [2/2], and
outputs channel configurations [2/2] and [2/4]. It is a figure which shows the pattern in the case
of forming the signal which is], [2/3], and [2/0]. Further, FIG. 5 converts input audio signals
having channel configurations of [3/0], [3/2], and [3/3], and outputs output channel
configurations of [3/4] and [3/4]. It is a figure which shows the pattern in the case of forming
the signal which is 3/3], [3/2], and [3/0]. Further, FIG. 6 converts input audio signals having
channel configurations of [3/0], [3/2], and [3/3], and outputs output channel configurations of
[2/2] and [2/4]. It is a figure which shows the pattern in the case of forming the signal which is],
[2/3], and [2/0]. The outline of each of FIGS. 3 to 6 will be described below. First, the pattern
shown in FIG. 3 will be described. In FIG. 3, when the channel configuration of the input audio
signal is a monaural audio signal of only the center channel C, as shown in the [1/0] column, the
channel configuration other than the center channel C is The output audio signal of each output
channel is formed from the input audio signal of the center channel C by the extension function.
Further, in FIG. 3, as shown in the [2/0] column, the channel configuration of the input audio
signal is a two-channel configuration of the left front channel L and the right front channel R. In
this case, the output audio signal of the left rear channel SL and the left rear subchannel SBR is
formed from the input audio signal of the left front channel L by the extension function, and the
right rear channel SR and the right rear subchannel SBR are formed. The output audio signal is
formed from the input audio signal of the right front channel R by the extension function.
Further, in FIG. 3, as the channel configuration of the input audio signal is shown in the [2/0]
column, the output audio signal of the center channel C is the input audio signal of the left front
channel L and the right front channel. It is formed by the extension function from the R input
audio signal.
In this case, the audio signal of the center channel C as an output channel is formed by adding
the input audio signal of the left front channel L and the input audio signal of the right front
channel R to half the signal level. Ru. In other words, if the input voice signal of the left front
channel L is indicated by the letter L and the input voice signal of the right front channel R is
indicated by the letter R, calculation processing is performed such that (L + R) / 2. , And an audio
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signal of center channel C as an output channel is formed. Further, as in the case where the
channel configuration of the input audio signal is [2/0] and the output channel configuration is
[3/3], the left rear sub-channel SBL used as a rear center channel is an output channel
configuration. If it exists, the audio signal of the left rear sub-channel SBL as the output channel
is the same as when forming the audio signal of the center channel C in the output channel
configuration, the input audio signal of the left front channel L and the right front It is formed by
the extension function from the input audio signal of the channel R. Also in this case, the same
processing as in the case of forming the audio signal of the center channel C is performed.
Further, in FIG. 3, as the channel configuration of the input audio signal is shown in the column
[2/2], the channel configuration of the input audio signal is a left front channel L, a right front
channel R, a left rear channel SL When there is a 4-channel configuration of the right rear
channel SR, and there is both a left rear sub-channel SBR and a left rear sub-channel SBR as an
output channel configuration, the output voice of the left rear sub-channel SBR The signal is
formed by the extension function from the input audio signal of the left rear channel SL, and the
output audio signal of the left rear subchannel SBR is formed by the extension function from the
input audio signal of the right rear channel SR. Also, when the left rear sub-channel SBR is
present as the rear center channel in the output channel configuration, such as when the channel
configuration of the input audio signal is [2/2] and the output channel configuration is [3/3] The
output sound signal of the left rear sub-channel SBR is formed by the extension function from the
input sound signal of the left rear channel SL and the input sound signal of the right rear channel
SR. In this case, the input sound signal of the left rear channel SL and the input sound signal of
the right rear channel SR are added together, and the signal level is halved to set the left rear
sub-channel SBR as an output channel. An audio signal is formed.
That is, if the input voice signal of the left rear channel SL is indicated by the letter SL, and the
input voice signal of the right rear channel SR is indicated by the letter SR, the calculation
process of (SL + SR) / 2 is performed. The output audio signal of the subchannel SBR is formed.
When the channel configuration of the input audio signal is [2/2] and the output channel
configuration is [3/0], the channel configuration of the input audio signal is the left rear channel
SL and the right rear channel SR. Although provided, in the output channel configuration, the left
rear channel SL and the right rear channel SR do not exist. In this case, the downmix function
mixes the input audio signal of the left rear channel SL with the output audio signal of the left
front channel L, and the input audio signal of the right rear channel SR with the output audio of
the right front channel R It is mixed with the signal so that the input audio signal can be used
without waste. Even when the channel configuration of the input audio signal is each pattern
shown in the column [2/2], the audio signal of the center channel C in the output channel has the
channel configuration of the input audio signal [2]. It is formed in the same manner as in the case
of each pattern shown in the column of / 0]. Next, the pattern shown in FIG. 4 will be described.
Each pattern shown in FIG. 4 is the same as that of FIG. 3 except that in the output channel
configuration, the center channel C does not exist in the front channel, and the left front channel
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L and the right front channel R have two channels. It is almost the same as the case shown.
Therefore, each pattern shown in FIG. 4 performs almost the same processing as any of the
patterns shown in FIG. 3 except that the output sound signal of center channel C is not formed. It
can be understood that channel conversion of each pattern shown in is possible. Next, the pattern
shown in FIG. 5 will be described. In FIG. 5, when the channel configuration of the input audio
signal is the pattern shown in each column of [3/0] and [3/2], the channel configuration of the
input audio signal has center channel C. 3 except that the channel configuration shown in FIG. 3
is the same as the pattern shown in each column of [2/0] and [2/2], and the output sound of
each output channel matched with the output channel configuration A signal is formed. Then, in
FIG. 5, when the channel configuration of the input audio signal is [3/3] and the output channel
configuration is [3/4], when forming the output channel of the right rear sub-channel SBR, The
output sound signal of the right rear sub-channel SBR is formed from the input sound signal of
the left rear sub-channel SBL.
Further, as in the case where the channel configuration of the input audio signal is [3/3] and the
output channel configuration is [3/2] in FIG. 5, the rear center channel is used for the channel
configuration of the input audio signal. In the output channel configuration, when there is no
rear center channel, the input voice signal of the left rear subchannel SBL used as the rear center
channel is The downmix function distributes and mixes the output sound signal of the left rear
channel SL and the output sound signal of the right rear channel SR. Further, as in the case
where the channel configuration of the input audio signal is [3/3] and the output channel
configuration is [3/0] in FIG. 5, the rear channel is included in the channel configuration of the
input audio signal. If there is no rear channel in the output channel configuration, the downmix
function mixes the input audio signal of the left rear channel SL with the output audio signal of
the left channel L, and the input of the right rear channel SR The audio signal is mixed with the
output audio signal of the right channel R. Also in this case, the input sound signal of the left rear
sub-channel SBL used as the rear center channel is divided into the output sound signal of the
left channel L and the output sound signal of the right channel R by the downmix function. Be
mixed. Next, the pattern shown in FIG. 6 will be described. Each pattern shown in FIG. 6 is a
three-channel input audio signal in which the front channel has a center channel C, and a twochannel output channel configuration without using the center channel C. Therefore, as shown in
FIGS. 3 to 5 except that the downmix function is used to mix the input audio signal of the center
channel C into the left front channel L and the right front audio channel R. Similar to any pattern,
the extension function and the downmix function are used to form an output audio signal for an
output channel that matches the output channel configuration. As described above, the channel
conversion unit 3 of this embodiment can perform channel conversion of the 48 patterns shown
in FIGS. 3 to 6. Then, as shown in FIG. 3 to FIG. 6, if the channel configuration of the input audio
signal and the output channel configuration are known, it is decided what kind of channel
conversion should be performed.
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Then, in the audio amplifier device of this embodiment, as described above, a large number of
conversions determined in accordance with the channel configuration and output channel
configuration of the input audio signal in the non-volatile memory 54 of the control unit 5
Information is stored and kept. FIG. 7 is a diagram for explaining conversion information
determined in accordance with the channel configuration of the input audio signal and the
output channel configuration. As shown in FIG. 7, in this embodiment, six channel configurations
of the input audio signal are assumed to correspond to all of the 48 channel conversion patterns
shown in FIGS. Assuming that there are eight output channel configurations, conversion
information is formed and stored. The conversion information has a configuration in which the
coefficients to be set to each of the 31 amplifiers of the channel conversion unit 3 are tabulated.
When the channel configuration and output channel configuration of the input audio signal are
determined, the conversion information to be supplied to the channel conversion unit 3 is
determined. For example, in the case where the channel configuration of the input audio signal is
[2/0] and the output channel configuration is [3/2], the table data of TBL_23 is shown as
surrounded by a thick line in FIG. When used as conversion information, when the channel
configuration of the input audio signal is [3/0] and the output channel configuration is [2/2], as
indicated by a bold line in FIG. Table data is used as conversion information. FIG. 8 is a diagram
for explaining a specific example of conversion information. In FIG. 8, as described above, the
contents of TBL_23, which is conversion information used when the channel configuration of the
input audio signal is [2/0] and the output channel configuration is [3/2], and the input audio The
content of TBL_45 which is conversion information used when the channel configuration of the
signal is [3/0] and the output channel configuration is [2/2] is shown. As shown on the left side
of FIG. 8, TBL_23, which is conversion information used when the channel configuration of the
input audio signal is [2/0] and the output channel configuration is [3/2], is shown in FIG. As the
coefficients of the amplifiers KCL and KRC of the extension unit 31 of the channel conversion
unit 3 configured as shown, “0.5” is used as the coefficients of the amplifiers KCL and KRSR of
the extension unit 31 and the amplifier circuit Kf of the downmix unit 32. It has "1.0" as a
coefficient of Kc and Ks, and "0 (zero)" as a coefficient of each amplifier other than these.
FIG. 9 shows the flow of audio signals in the channel conversion unit 3 when TBL_23 shown on
the left side of FIG. 8 is used. As shown in FIG. 9, “0.5” is set as a coefficient to the amplifiers
KCL and KRC of the extension unit 31, and the amplifiers KLSL and KRSR of the extension unit
31 and the amplifier circuits Kf, Kc, and of the downmix unit 32. "1.0" is set to Ks as a coefficient.
The coefficient of each amplifier other than this is “0 (zero)”, so the description is omitted in
FIG. As described above, when the coefficient is set for each amplifier of the channel conversion
unit 3, the path indicated by the solid line in FIG. 9 is the path through which the audio signal
flows. In this case, as shown in FIG. 9, the input audio signal of the left channel L is supplied to
the mixers 11 and 14 as it is, and the signal level is set through the amplifier KLC in which
“0.5” is set as a coefficient. After being halved, it is fed to the mixer 12. Similarly, after the
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input audio signal of the right channel R is supplied to the mixers 13 and 15 as it is and after the
signal level is halved through the amplifier KRC in which “0.5” is set as a coefficient , Is
supplied to the mixer 12. The mixer 12 is supplied with the left front channel L and the right
front channel R whose signal levels are divided and mixed, so that the mixer 12 outputs the
output sound signal of the center channel C. Ru. Also, from the mixers 14, 15, the input audio
signals of the left front channel L and the right front channel R are output as they are as the
output audio signals of the left rear channel SL and the right rear channel SR. In this way, the
extension function is used to form audio signals having the number of channels greater than the
number of channels of the input audio signal. In the downmix unit 32, the coefficients “1.0”
are applied to the amplifiers Kf of the left front channel L and the right front channel R, the
amplifier Kc of the center channel C, and the amplifier Ks of the left rear channel SL and the right
rear channel SR. Since “is set, an output sound signal is output from these. Therefore, in this
example, the output audio signal is output to the output channel corresponding to each of the left
front channel L, the center channel C, the right front channel R, the left back channel SL, and the
right back channel SR. . Further, as shown in the right-hand column of FIG. 8, TBL ̶ 45, which is
conversion information used when the channel configuration of the input audio signal is [3/0]
and the output channel configuration is [2/2]. 2 as “1.0” as the coefficients of the amplifiers
KLSL and KRSR of the extension unit 31 of the channel conversion unit 3 configured as shown in
FIG. 2 and the amplifier circuits Kf and Ks of the downmix unit 32. The coefficient of the
amplifier circuit Kcf of the unit 32 is “0.7”, and the coefficient of the other amplifiers is “0
(zero)”.
FIG. 10 shows the flow of audio signals in the channel conversion unit 3 in the case of using TBL
̶ 45 shown in the right column of FIG. As shown in FIG. 10, "0.1" is set as a coefficient to the
amplifiers KLSL and KRSR of the extension unit 31 and the amplifier Kf of the downmix unit 32,
and the amplifier Kcf of the downmix unit 32 is set as a coefficient. "0.7" is set. The coefficient of
each amplifier other than this is “0 (zero)”, and therefore the description is omitted in FIG. As
described above, when the coefficient is set for each amplifier of the channel conversion unit 3,
the path indicated by the solid line in FIG. 10 is the path through which the audio signal flows. In
this case, as shown in FIG. 10, the input audio signal of the left channel L is supplied to the
mixers 11 and 14 as it is, and the input audio signal of the center channel C is supplied to the
mixer 12 as it is. The input audio signal of channel R is supplied to mixers 13 and 14 as it is. In
this way, the extension function is used to form audio signals with the number of channels more
than the number of channels of the input audio signal. In the downmix unit 32, the amplifier Kc
of the center channel C is set to “0.7” as a coefficient. Therefore, the signal level of the audio
signal of the center channel C from the extension unit 31 is the original And 70% of the signal of
(1) and supplied to the mixers 21 and 22. Further, a coefficient “1.0” is set for the left front
channel L and the right front channel R amplifier Kf, and the left rear channel SL and the right
rear channel SR amplifier Ks. Therefore, the mixer 21 outputs an output sound signal formed by
mixing the sound signal of the left front channel L and the sound signal of the center channel C,
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and the mixer 22 outputs an output sound signal of the right front channel R. An output audio
signal formed by mixing the audio signal and the audio signal of the center channel C is output.
The mixer 23 outputs an audio signal of the left rear channel SL from the extension unit 31, and
the mixer 24 outputs audio of the right rear channel SR from the extension unit 31. In this way,
the downmix function is used to form an audio signal with a smaller number of channels than the
number of channels of the input audio signal. Therefore, in the case of this example, the output
audio signal is output to the output channel corresponding to each of the left front channel L, the
right front channel R, the left back channel SL, and the right back channel SR.
If the output channel configuration is a 5.1 channel or 7.1 channel configuration and a
subwoofer component corresponding to “.1” in this case is required, the original input audio
signal is used. The low frequency component contained may be extracted and output. Then, as in
TBL_23 and TBL_45 shown in FIG. 8, according to each conversion pattern shown in FIGS. 3 to 6,
each amplifier in channel conversion unit 3 configured as shown in FIG. 2 is set A table of
coefficients is formed in advance, and as shown in FIG. 7, it is stored in the non-volatile memory
54 of the control unit 5 in association with the channel configuration of the input audio signal
and the output channel configuration. Then, by using this conversion information, it is possible to
perform various channel conversions in the channel conversion unit 3 in accordance with the
combination of the channel configuration of the input audio signal and the output channel
configuration shown in FIG. . The configuration example of the channel conversion unit 3 shown
in FIG. 2 is merely an example of the configuration, and channel conversion units of various
configurations may be configured according to the number of channels of the input audio signal
and the output channel configuration. It is possible. In this case, the number of channels in the
extension section and the downmix section does not have to be the same, and the number of
output channels in the extension section may be greater than the number of input channels in
the downmix section. Further, in the above-described embodiment, the channel conversion unit 3
is provided with the downmixing unit 32 at the subsequent stage of the extension unit 31.
However, the present invention is not limited to this. First, the downmixing unit 32 may be
provided, and the extension unit 31 may be provided downstream of the downmixing unit 32.
However, if the downmixing unit 32 is provided at the subsequent stage of the extension unit 31
and the downmixing process is performed after the number of channels is first expanded, the
presence does not deteriorate. To perform channel conversion. In the embodiment described
above, in the case of forming an audio signal of a channel not present in the input audio signal in
the extension unit 31 of the channel conversion unit 3, the audio signal is simply copied between
the channels. Although it has been described that it is to be done, it is not limited to this.
A sound field processing algorithm may be applied to the extension unit 31, and the extension
unit 31 may be configured to have the extension function as described above as part of the
sound field processing. Of course, it is also possible to finely adjust the coefficients supplied to
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each amplifier. Further, it is conceivable that there are users who want to reproduce the audio
signal as it is, regardless of the output channel configuration and the actual channel
configuration of the supplied input audio signal. In consideration of the above, in the audio
amplifier apparatus in which the channel conversion unit 3 is mounted, the user operates the
channel conversion unit 3 according to his or her preference to perform channel conversion, or
the channel conversion unit 3 It may be possible to select whether to make it not operate.
Further, in the embodiment described above, the channel conversion unit 3 has been described
as being realized by the DSP, but the present invention is not limited to this. When the audio data
decoding unit 2 has a D / A (Digital / Analog) conversion function and outputs the audio signal of
each channel as an analog signal, the channel conversion unit 3 is an analog circuit. It is of
course also possible to configure. When the channel conversion unit 3 is configured as an analog
circuit, it can be configured by using a variable amplifier or a mixer, and by providing a switch
for each channel, the audio signal of that channel is provided in the subsequent stage. It is also
relatively easy to control whether or not to supply. Further, it is of course possible to configure
the channel conversion unit 3 shown in FIG. 2 as an IC and provide it alone. Also, in this
embodiment, the output channel configuration has been described as being preset by the user,
but the present invention is not limited to this. A channel that sends a weak test signal to each
output channel, detects differences in impedance and changes in each output channel, and
automatically detects the speaker's connected output channel and the speaker's unconnected
output channel. For example, the configuration detection unit may be provided downstream of
the channel conversion unit 3 and the output channel configuration detected here may be
registered in a predetermined memory such as a non-volatile memory. As another method, a
microphone is installed at the listening position, a test voice is emitted from the speaker, and an
analysis unit is provided for collecting and analyzing the test voice from the speaker. The output
channel configuration and the installation position of the speaker may be detected, and the
detected output channel configuration may be registered in a predetermined memory such as a
non-volatile memory and used.
Although the present invention has been described as applied to an audio amplifier device in the
above-described embodiment, it is needless to say that the present invention can be applied to
various audio devices to which a plurality of speakers can be connected. . As described above,
according to the present invention, regardless of the channel configuration of the input audio
signal, the reproduced audio corresponding to the input audio signal is listened to using all the
speakers set. be able to. In addition, by receiving the input audio signal of all channel
configurations, the user can effectively listen to the reproduced audio according to the input
audio signal using all the speakers set without troublesome operation. You can do it. Further, by
adding the channel conversion function to a sound device such as an audio amplifier as a mode
for obtaining a simple sound field effect, it is possible to increase the added value of the sound
device. In addition, since all the speakers can always emit the reproduced sound, there is no
speaker that is not emitted the sound resulting from the difference between the channel
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configuration of the input audio signal and the output channel configuration, and the failure of
the audio equipment It is possible not to cause inconvenience such as mistake. BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram for explaining an audio amplifier
apparatus to which an embodiment of the present invention is applied. FIG. 2 is a diagram for
explaining a configuration example of a channel conversion unit shown in FIG. 1; FIG. 3 is a
diagram for explaining a channel conversion pattern. FIG. 4 is a diagram for explaining a channel
conversion pattern. FIG. 5 is a diagram for explaining a channel conversion pattern. FIG. 6 is a
diagram for explaining a channel conversion pattern; FIG. 7 is a diagram for describing
conversion information used in a channel conversion unit. [Fig. 8] Fig. 8 is a diagram for
describing a specific example of conversion information. 9 is a diagram for explaining the flow of
audio signals in the channel conversion unit 3 when TBL_23 shown in FIG. 8 is used. 10 is a
diagram for explaining the flow of audio signals in the channel conversion unit 3 when TBL_45
shown in FIG. 8 is used. [Description of the code] 1 ... input terminal of digital audio signal, 2 ...
audio data decoding unit, 3 ... channel conversion unit, 31 extension unit, 32 ... downmix unit, 4 ...
speaker unit corresponding to multi audio channel, 5 ... Control unit, 51: CPU, 52: ROM, 53: RAM,
54: non-volatile memory, 55: system bus, 6: key operation unit
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