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JPH1094086

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DESCRIPTION JPH1094086
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproducing apparatus and an audio reproducing method, and more particularly to an
audio reproducing apparatus and an audio reproducing method suitable for reproducing multichannel audio signals. In an audio reproduction device that reproduces multi-channel audio
signals, the audio signal is not correctly reproduced unless the predetermined number of
speakers are properly connected to the audio reproduction device. For example, in the case of an
audio reproduction apparatus that reproduces audio signals of two channels of right (R) channel
and left (L) channel, the audio signal of R channel is reproduced if a speaker is connected only to
L channel of the audio reproduction apparatus. No stereo sound is reproduced.
[0002]
2. Description of the Related Art In the sound system of a movie theater, multi-channel audio
signals such as six channels and eight channels are reproduced using a corresponding number of
speakers in order to enable the reproduction of rich sound.
[0003]
Recently, it has been desired to reproduce powerful sound with a sense of realism, such as a
sound system of a movie theater, at home, etc., and a so-called home theater system has been
proposed.
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1
The home theater system comprises an audio visual (AV) system installed in a listening room
such as a home, a plurality of speakers connected to the AV system, and a television monitor. The
AV system displays, for example, a video signal reproduced from a video disc on a television
monitor, and supplies an audio signal reproduced from the video disc to each speaker to realize
surround sound. In this case, the speakers are arranged in substantially the same positional
relationship with the television monitor and the listener as the sound system of the movie
theater. According to such a home theater system, it is possible to reproduce realistic sound that
is very close to the sound system of a movie theater.
[0004]
The main body of the AV system is provided with an output terminal for outputting an audio
signal of each channel. Each output terminal is connected to a cord from a speaker of the
corresponding channel. Therefore, for example, when audio signals of six channels are
reproduced, the main body of the AV system is provided with six output terminals, and these
output terminals are a front right speaker, a front left speaker, and a front center speaker , The
rear right speaker, the rear left speaker and the cord from the subwoofer are connected.
[0005]
However, when the number of audio signal channels increases, the number of speakers to be
connected to the AV system also increases by at least as much as the number of channels. , The
possibility of incorrect connection is increased accordingly. For example, if the user forgets to
connect the front center speaker to the AV system, surround sound can not be realized because
the audio signal of the channel to be reproduced from the front center speaker is not reproduced
at all, and the sound presence There was a problem that the feeling was almost lost.
[0006]
On the other hand, when using the AV system at home, etc., the number of speakers to be
connected should be all connected to the AV system due to space restrictions of the room used as
a listening room, restrictions on decoration of the room, price of speakers etc. In some cases,
connection can not be made. That is, when there is space restriction in a room, one or more
speakers among the speakers to be originally connected to the AV system can not be connected
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2
because there is no space for arranging all the speakers. In addition, when there is a restriction
on the decoration of the room, the user may not want to arrange all the speakers due to
problems with aesthetics etc. Also in this case, one or more of the speakers to be originally
connected to the AV system Speaker can not be connected. Furthermore, because the speakers
are expensive, the user may not be able to purchase all of the speakers at one time, and again in
this case one or more of the speakers that should be connected to the AV system can not be
connected. As described above, if all the speakers to be originally connected to the AV system are
not connected, the audio signals of all the channels to be reproduced from the speakers can not
be reproduced, so that surround sound can not be realized and the realism of sound is
significantly lost. There was a problem of being
[0007]
Therefore, according to the present invention, an audio reproducing apparatus and an audio
capable of reproducing the sound of each channel without significantly reducing the sense of
reality even if not all speakers to be originally connected to the audio reproducing apparatus are
connected for any reason The purpose is to provide a regeneration method.
[0008]
The above problem is solved by an output circuit for outputting audio signals of a plurality of
channels to a plurality of corresponding terminals according to claim 1, and one or a plurality of
terminals not connected to a speaker. Detection means for detecting the noise and a nonconnecting terminal not connected to the speaker, the voice signal to be supplied to the nonconnecting terminal is automatically distributed to at least one of the remaining terminals. And a
circuit for achieving the same.
[0009]
In the invention according to claim 2, according to claim 1, the detection means comprises a
switch for detecting the non-connecting terminal.
According to a third aspect of the present invention, in the second aspect, the switch is
incorporated in a pin jack to which a pin provided at one end of the connection cord of the
speaker is connected.
[0010]
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3
According to a fourth aspect of the present invention, in the first aspect, the detection means
comprises a current detection circuit which detects the non-connection terminal from the current
flowing to the terminal.
According to a fifth aspect of the present invention, in any of the first to fourth aspects, at least
the output circuit and the distribution circuit are incorporated in a computer main body of a
computer system.
[0011]
In the invention according to claim 6, according to any one of claims 1 to 5, the audio signals of
the plurality of channels are front right speaker, front left speaker, front center speaker, rear
right with respect to the reference listening position. And six or more channels of audio signals to
be supplied to the rear left speaker and the subwoofer.
[0012]
The above-mentioned problems are solved by the steps of: outputting the audio signals of a
plurality of channels to corresponding terminals; detecting one or more terminals not connected
to the speaker; and connecting to the speaker And C. automatically distributing an audio signal to
be supplied to the non-connecting terminal to at least one of the remaining terminals when the
non-connecting terminal is detected.
[0013]
In the invention according to claim 8, in the step of detecting the non-connecting terminal
according to claim 7, the non-connecting terminal is detected by a switch.
In the invention according to claim 9, in the step according to claim 7, the step of detecting the
non-connecting terminal is performed by using a switch incorporated in a pin jack to which a pin
provided at one end of the connecting cord of the speaker is connected. To detect
[0014]
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4
In the invention according to claim 10, in the step of detecting the non-connecting terminal
according to claim 7, the non-connecting terminal is detected by a current detection circuit which
detects a current flowing to the terminal.
In the invention according to claim 11, in any of claims 7 to 10, at least the step of outputting the
audio signal and the step of automatically distributing the audio signal are performed by
functions incorporated in a computer main body of a computer system. To realize.
[0015]
In the invention according to claim 12, according to any one of claims 7 to 11, the audio signals
of the plurality of channels are front right speaker, front left speaker, front center speaker, rear
right with respect to the reference listening position. And six or more channels of audio signals to
be supplied to the rear left speaker and the subwoofer.
[0016]
According to the inventions of claims 1 and 7, even if not all speakers to be originally connected
to the audio reproduction apparatus are connected for any reason, the sound of each channel can
be reproduced without significantly reducing the sense of reality. Thus, it is possible to reliably
prevent the inconvenience that the audio signal of a specific channel is not reproduced at all.
[0017]
According to the inventions as set forth in claims 2 to 4 and 8 to 10, a speaker which is not
connected to the audio reproduction apparatus using a relatively simple structure, that is, a
channel to which the speaker is originally connected should be detected with certainty. Can.
According to the inventions of claims 5 and 11, a computer system such as a personal computer
can easily provide a powerful sound like a cinema sound system like a home theater system as in
a home theater system. But it will be reproducible.
[0018]
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5
According to the sixth and twelfth aspects of the invention, the sound signal with six or more
channels makes it possible to reproduce a powerful sound with a sense of realism like a movie
theater sound system even at home or the like.
Therefore, according to the present invention, an audio signal to be reproduced from an
unconnected speaker is automatically transmitted to another speaker even if all the speakers to
be originally connected to the audio reproduction device are not connected for any reason. By
distributing and reproducing, it is possible to reproduce the sound of each channel without
significantly reducing the sense of reality, and it is possible to reliably prevent the inconvenience
that the audio signal of a specific channel is not reproduced at all.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION An audio reproduction apparatus according
to the present invention and an audio reproduction method according to the present invention
are provided by one or more non-speaker terminals not connected to a speaker among a plurality
of terminals corresponding to audio signals of a plurality of channels. When the connection
terminal is detected, an audio signal to be supplied to the non-connection terminal is
automatically distributed to at least one of the remaining terminals.
[0020]
According to the audio reproduction device and the audio reproduction method of the present
invention, even if all the speakers that should be connected to the audio reproduction device are
not connected for any reason, the audio signal to be reproduced from the unconnected speaker is
By automatically distributing to other speakers for reproduction, it becomes possible to
reproduce the sound of each channel without significantly reducing the sense of presence, and to
prevent the occurrence of the inconvenience that the audio signal of a specific channel is not
reproduced at all. it can.
[0021]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a block diagram showing
the main part of a first embodiment of an audio reproduction apparatus according to the present
invention.
The first embodiment of the audio reproduction apparatus adopts the first embodiment of the
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audio reproduction method according to the present invention.
The audio reproduction device 1 comprises a recording medium driver 2 connected as shown in
the figure, an AC-3 demodulator 3, an AC-3 decoder 4 and a power amplifier 5. The recording
medium driver 2 is a known device for reproducing at least multi-channel audio signals from a
recording medium (not shown) such as a magnetic disk such as a floppy disk, a CD-ROM, an
optical disk, a magneto-optical disk, and a digital video disk. , And may have a function of
recording information on a recording medium. Also, each of the AC-3 demodulator 3, the AC-3
decoder 4 and the power amplifier 5 may have a known configuration.
[0022]
In this embodiment, surround sound processing is performed which employs digital AC-3.
Therefore, the audio data for six channels reproduced from the recording medium and outputted
from the recording medium driver 2 is demodulated by the AC-3 demodulator 3 and the six
speakers R constituting the speaker group 10 by the AC-3 decoder 4 , L, C, LS, RS, and SW are
decoded into audio signals. The audio signals of six channels from the AC-3 decoder 4 are
supplied to the corresponding six speakers R, L, C, LS, RS, SW via the power amplifier 5. In the
present embodiment, since AC-3 is employed, the speaker group 10 has the front right speaker R,
the front left speaker L, the front center speaker C, and the rear right with reference to the user's
listening position. It consists of a speaker RS of (light surround), a speaker LS of rear left (left
surround), and a subwoofer SW. The speakers R, L, C, LS, RS are used to reproduce the sound
field of the direction of the sound image and the listening position, and the subwoofer SW is used
to reproduce particularly powerful bass. Since there is no sense of direction in the bass, only one
subwoofer SW is used.
[0023]
The surround sound processing is not limited to the digital method such as AC-3 described
above, and it is also possible to adopt, for example, an analog Dolby Pro Logic. The audio
reproduction device 1 may be a device dedicated to the home theater system, or may be built in a
computer system such as a personal computer. In addition, digital signals such as telephone lines,
ISDN, and the Internet can be used for audio signals of multiple channels, whether reproduced
from an information recording medium such as a video disc, or received from a broadcast
medium such as a television broadcast or radio broadcast. It may be obtained from media.
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7
[0024]
Also, when the audio reproduction device 1 constitutes a part of an AV system of a home theater
system, video data is also recorded on the recording medium, and the reproduced video data is
digital such as MPEG-1 or MPEG-2 etc. Video signal processing adopting the method is
performed. Since such video signal processing itself is well known and is not directly related to
the subject matter of the present invention, the illustration and description thereof will be
omitted herein.
[0025]
FIG. 2 is a perspective view showing the front of the audio reproduction device 1. In the figure,
the front panel 1-1 is provided with a power switch 20, a power status display unit 21, an
individual volume switch group 22, a master volume switch 23, and the like. The individual
volume switch group 22 comprises a total of six switches which can independently adjust the
reproduction volume of the audio signal of each channel. The six switches R, L, C, LS, RS, and SW
are assigned the same reference numerals as those of the six switches.
[0026]
FIG. 3 is a perspective view showing the rear of the audio reproduction device 1. In the figure,
the rear panel 1-2 is provided with an output terminal group 25, an input terminal 26, a power
cable 27 and the like. The output terminal group 25 consists of a total of six output terminals for
outputting the audio signal of each channel. These six output terminals are given the same
reference numerals in correspondence with the six speakers R, L, C, LS, RS, SW to be connected.
For example, an RF signal adopting AC-3 is input to the input terminal 26. This RF signal is
supplied from broadcast media or digital communication media. When an RF signal is supplied to
the input terminal 26, the AC-3 demodulator 3 shown in FIG. 1 is supplied with this RF signal, not
the audio signal from the recording medium driver 2.
[0027]
FIG. 4 is a block diagram showing a first embodiment of the power amplifier 5. The power
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amplifier 5 includes input terminals 26LS, 26RS, 26SW, 26L, 26R, 26C, amplifiers 51 to 56,
output terminals 25LS, 25RS, 25SW, 25L, 25R, 25C, and a sensor 31 which are connected as
generally shown. And a control unit 32, a mute circuit 33, and mixer circuits 33 and 34. The
input terminals 26LS, 26RS, 26SW, 26L, 26R, 26C are supplied to the audio signal of the
corresponding channel from the AC-3 decoder 4 shown in FIG. 1, that is, to the speakers LS, RS,
SW, L, R, C An audio signal to be input is input. The output terminals 25LS, 25RS, 25SW, 25L,
25R, 25C constitute an output terminal group 25 shown in FIG.
[0028]
The audio signal of the channel input to the input terminals 26LS, 26RS, 26SW, 26C to be
supplied to the speakers LS, RS, SW, C is output through the corresponding amplifier 51, 52, 53,
56 to the output terminals 25LS, 25RS, Output from 25SW and 25C. Also, the audio signal of the
channel input to the input terminals 26L and 26R to be supplied to the speakers L and R is
output from the output terminals 25L and 25R via the corresponding mixer circuits 34 and 35
and the amplifiers 54 and 55. The audio signal of the channel to be supplied to the speaker C is
also input to the mute circuit 33 via the input terminal 26C, and the output signal of the mute
circuit 33 is supplied to the mixer circuits 34 and 35.
[0029]
When the mute circuit 33 is set to the disabled state by the control signal from the control unit
32, the audio signal from the input terminal 26C is supplied to the mixer circuits 34 and 35. In
this case, the output of the mixer circuit 34 is an input It becomes a synthetic signal of the audio
signal of the channel inputted to the terminals 26L, 26C, and the output of the mixer circuit 35
becomes a synthetic signal of the audio signal of the channel inputted to the input terminals 26R,
26C. On the other hand, when the mute circuit 33 is set to the enable state by the control signal
from the control unit 32, the mute circuit 33 shuts off the output to the mixer circuits 34 and 35.
Therefore, in this case, the output of the mixer circuit 34 is only the audio signal of the channel
input to the input terminal 26L, and the output of the mixer circuit 35 is only the audio signal of
the channel input to the input terminal 26R.
[0030]
The sensor 31 detects a state in which a pin (not shown) provided at the tip of the cord of the
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speaker C is connected to the output terminal 25C, and supplies a detection signal to the control
unit 32. The control unit 32 supplies the disable signal to the mute circuit 33 only when the
detection signal from the sensor 31 indicates the disconnection state, and the enable signal to the
mute circuit 33 when the detection signal indicates the connection state. Supply. The sensor 31
may detect the connection state of the pin and the output terminal 25C by mechanical means,
may detect the connection state by optical means such as an optical sensor, or may detect the
connection state by electrical means. The sensor 31 itself may be of a known configuration.
[0031]
The control unit 32, the mute circuit 33, and the mixer circuits 33 and 34 may be of well-known
configurations, respectively. When the recording medium driver 2 shown in FIG. 1 reproduces a
recording medium on which a movie including six channels of audio signals is recorded, a voice
such as a character of a movie character is generally supplied to the speaker C at the front center
The audio signals of the channels, which are included in the audio signals of (1) and supplied to
the other speakers R, L, LS, RS, and SW, relate to various sound effects and the like. For this
reason, if the pin at the tip of the cord of the speaker C is not connected to the corresponding
output terminal 25C for any reason, no sound is reproduced from the speaker C at all, and the
user can not enjoy the movie.
[0032]
However, even in such a case, according to the present embodiment, the sensor 31 detects that
the speaker C is not connected, and the mute circuit 33 is automatically set in the disabled state
by the control unit 32. Ru. As a result, the audio signal of the channel that should normally be
reproduced from the speaker C is synthesized with the audio signal of the channel supplied to
the connected speakers L and R, and reproduced from the speakers L and R. That is, since the
audio signal of the channel to be originally reproduced from the unconnected speaker C is
automatically distributed to the connected speakers L and R, the sense of presence is somewhat
lost, but the sense of presence is not significantly reduced. The sound of each channel can be
reproduced, and the inconvenience that the sound signal of a specific channel is not reproduced
at all can be surely prevented.
[0033]
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10
FIG. 5 is a block diagram showing a second embodiment of the power amplifier 5. In the figure,
the same parts as those in FIG. 4 are assigned the same reference numerals and explanations
thereof will be omitted. In the second embodiment of the power amplifier 5, the switchless pin
jack is used to detect a speaker not connected to the audio reproduction apparatus.
[0034]
In FIG. 5, the mixer circuits 34 and 35 are provided on the output side of the amplifiers 54 and
55. The output terminal 25C is provided with a switch-equipped pin jack 25C-1. The switchequipped pin jack 25C-1 is configured to supply the audio signal of the channel output from the
amplifier 56 to the mixer circuits 34 and 35 when the pin at the end of the cord connected to the
speaker C is not connected. . When the pin at the end of the cord connected to the speaker C is
connected to the switched pin jack 25C-1, the audio signal of the channel output by the amplifier
56 is not supplied to the mixer circuits 34 and 35, and the output terminal It is supplied to the
speaker C via 25C.
[0035]
As a result, if the pin at the end of the cord connected to the speaker C is not connected to the
switched pin jack 25C-1, the audio signal of the channel that should normally be reproduced
from the speaker C is connected. The sound signals of the channels supplied to the speakers L
and R are synthesized and reproduced from the speakers L and R. That is, since the audio signal
of the channel to be originally reproduced from the unconnected speaker C is automatically
distributed to the connected speakers L and R, the sense of presence is somewhat lost, but the
sense of presence is not significantly reduced. The sound of each channel can be reproduced, and
the inconvenience that the sound signal of a specific channel is not reproduced at all can be
surely prevented.
[0036]
In addition, as a pin jack 25C-1 with a switch, the thing of a well-known structure can be used,
for example, the pin jack JPJ1030 by Hosiden Corporation can be used. FIG. 6 is a block diagram
showing a third embodiment of the power amplifier 5. In the figure, the same parts as those in
FIG. 4 are assigned the same reference numerals and explanations thereof will be omitted. In the
third embodiment of the power amplifier 5, the switchless pin jack is used to detect a speaker not
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11
connected to the audio reproduction apparatus.
[0037]
In FIG. 6, switch-equipped pin jacks 25LS-1, 25RS-1, 25SW-1, 25L-1, 25R-1, 25R-1, 25Ccorresponding to the respective output terminals 25LS, 25RS, 25SW, 25L, 25R, 25C. 1 is
provided. In addition, mixer circuits 61 to 66 are provided.
[0038]
In the mixer circuit 61, when the speaker LS corresponding to the switched pin jack 25LS-1 is
not connected, that is, when the pin at the end of the cord connected to the speaker LS is not
connected, The voice signal and the voice signal of the channel output from the amplifier 54 are
synthesized and output.
[0039]
The mixer circuit 62 combines the audio signal of the channel output by the amplifier 52 and the
audio signal of the channel output by the amplifier 55 if the speaker RS corresponding to the pin
jack 25RS-1 with switch is not connected. .
If the speaker L corresponding to the switched pin jack 25L-1 is not connected, the mixer circuit
63 synthesizes an audio signal output from the mixer circuit 64 described later and an audio
signal output from the mixer circuit 65 described later. Output.
[0040]
If the speaker R corresponding to the switch-equipped pin jack 25R-1 is not connected, the mixer
circuit 64 combines the audio signal output from the mixer circuit 63 and the audio signal output
from the mixer circuit 66 described later and outputs the combined signal. . When the speaker
SW corresponding to the switch-equipped pin jack 25SW-1 is not connected, the mixer circuit 65
synthesizes and outputs the audio signal of the channel output from the amplifier 53 and the
audio signal output from the mixer circuit 62. If the speaker C corresponding to the switchequipped pin jack 25C-1 is not connected, the audio signal of the channel output from the
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amplifier 56 and the audio signal output from the mixer circuit 62 are synthesized and output.
Therefore, if the speakers SW and C are not connected together, the mixer circuit 65 combines
the audio signal of the channel output from the amplifiers 53 and 56 with the audio signal
output from the mixer circuit 62.
[0041]
When the speaker SW corresponding to the switch-equipped pin jack 25SW-1 is not connected,
the mixer circuit 66 synthesizes and outputs the audio signal of the channel output by the
amplifier 53 and the audio signal output by the mixer circuit 61. If the speaker C corresponding
to the switch-equipped pin jack 25C-1 is not connected, the audio signal of the channel output
from the amplifier 56 and the audio signal output from the mixer circuit 61 are synthesized and
output. Therefore, if the speakers SW and C are not connected together, the mixer circuit 66
combines the audio signal of the channel output from the amplifiers 53 and 56 with the audio
signal output from the mixer circuit 61.
[0042]
Thereby, if at least one or both of the speaker L and the speaker R are connected, one or more
speakers are not connected to the corresponding output terminals 25LS, 25RS, 25SW, 25L, 25R,
25C for any reason. Also, since the audio signal that is originally intended to be reproduced from
the unconnected speaker is automatically distributed to the one or more connected speakers, the
sense of presence is somewhat lost, but each channel is not significantly degraded. Thus, it is
possible to reliably prevent the inconvenience that the sound signal of a specific channel is not
reproduced at all.
[0043]
FIG. 7 is a block diagram showing a fourth embodiment of the power amplifier 5.
In the figure, the same parts as those in FIG. 4 are assigned the same reference numerals and
explanations thereof will be omitted. In the fourth embodiment of the power amplifier 5, a
current detection circuit is used to detect a speaker not connected to the audio reproduction
apparatus.
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[0044]
In FIG. 7, the sensor 31 and the control unit 32 as shown in FIG. 4 are not provided, and a
current detection circuit 71 is provided instead. When the output terminal 25C is connected to
the speaker C, the current detection circuit 71 detects the flow of current and outputs a control
signal for setting the mute circuit 33 in the enable state. On the other hand, when the output
terminal 25C is not connected to the speaker C, the current detection circuit 71 does not detect
the flow of current and outputs a control signal for setting the mute circuit 33 in the disable
state.
[0045]
According to the present embodiment, it is detected that the speaker C is not connected by the
current detection circuit 71, and the mute circuit 33 is automatically set in the disabled state by
the control signal from the current detection circuit 71. As a result, the audio signal of the
channel that should normally be reproduced from the speaker C is synthesized with the audio
signal of the channel supplied to the connected speakers L and R, and reproduced from the
speakers L and R. That is, since the audio signal of the channel to be originally reproduced from
the unconnected speaker C is automatically distributed to the connected speakers L and R, the
sense of presence is somewhat lost, but the sense of presence is not significantly reduced. The
sound of each channel can be reproduced, and the inconvenience that the sound signal of a
specific channel is not reproduced at all can be surely prevented.
[0046]
The current detection circuit 71 itself may be of a known configuration. Further, although the
current detection circuit 71 is provided on the output side of the amplifier 56 in this
embodiment, it is needless to say that the current detection circuit 71 may be provided on the
input side of the amplifier 56. The point is that the current detection circuit 71 may be provided
at a position where it can detect the flow of current due to the connection of the speaker C to the
output terminal 25 C, and the current detection circuit 71 is provided outside the power
amplifier 5. It is good. Furthermore, the current detection circuit 71 may be provided for part or
all of processing systems of audio signals of other channels.
[0047]
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Each embodiment of the power amplifier 4 may be combined with one or more embodiments
according to the application. Next, a second embodiment of the audio reproduction apparatus
according to the present invention will be described. The second embodiment of the audio
reproduction apparatus adopts the second embodiment of the audio reproduction method
according to the present invention. In the present embodiment, as an example in which the
present invention is applied to an AV system, an audio reproduction apparatus is incorporated in
a personal computer system.
[0048]
FIG. 8 is a block diagram showing a second embodiment of the audio reproduction device. In the
figure, a personal computer system 100 generally comprises a computer main body 101, a
display device 102, and an input device 103 such as a keyboard. The computer main body 101
may use one having a known configuration except that it incorporates the audio reproduction
device 1 as shown in FIG. Also, the audio reproduction device 1 may share a part thereof with the
existing part of the computer main body 101. The computer main body 101 is provided with, for
example, an output terminal group 25 similar to the audio reproduction apparatus 1 shown in
FIG. 3, and a code group 104 consisting of six cords connected to the speaker group 10 is
connected via It is connected to the output terminal group 25.
[0049]
The computer main body 101 incorporates a known video signal processing system. Therefore, if
video data is also recorded on the recording medium, the reproduced video data is subjected to
video signal processing adopting a digital method such as MPEG-1 or MPEG-2 by the video signal
processing system, and the display device 102 is displayed. Is displayed on. On the other hand,
the audio data reproduced from the recording medium is demodulated and decoded by the audio
reproduction device 1, and the audio signals of six channels are reproduced by the speaker group
10. Also in this case, as in the case of the above embodiment, even if one or more speakers are
not connected to the corresponding output terminal of the output terminal group 25 for some
reason, it is desirable to reproduce from the unconnected speaker The audio signal of the
channel is automatically distributed to the connected speakers. For this reason, although the
sense of reality is somewhat lost, the sound of each channel can be reproduced without
significantly reducing the sense of presence, and it is possible to reliably prevent such a
disadvantage that the audio signal of a specific channel is not reproduced at all.
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[0050]
Next, a third embodiment of the audio reproduction device according to the present invention
will be described. The third embodiment of the audio reproduction apparatus adopts the third
embodiment of the audio reproduction method according to the present invention. In this
embodiment, eight channels of audio signals are reproduced as an example to which the present
invention can be applied to audio signals of six or more channels.
[0051]
FIG. 9 is a block diagram showing a third embodiment of the audio reproduction device. In the
figure, the same parts as those in FIG. In this embodiment, in addition to the six speakers R, L, C,
RS, LS, and SW used in the first embodiment, two speakers CR and CL are connected to the audio
reproduction device 1. The speaker CR is disposed slightly to the right of the front center with
respect to the user's listening position (center light), and the speaker CL is disposed slightly to
the left of the front center (center left) with respect to the user's listening position.
[0052]
As described above, even in the case of reproducing eight channels of audio signals, as in the
above embodiments, the sound of each channel can be reproduced without significantly reducing
the sense of reality, and the audio signal of a specific channel is completely absent. It is possible
to reliably prevent the occurrence of inconvenience such as not being reproduced.
[0053]
As mentioned above, although the present invention was explained by the example, the present
invention is not limited to the above-mentioned example, and needless to say, various
modification and improvement are possible within the scope of the present invention.
[0054]
According to the inventions of claims 1 and 7, even if all the speakers to be originally connected
to the audio reproduction apparatus are not connected for any reason, each channel is not
significantly reduced in the sense of reality. Thus, it is possible to reliably prevent the
inconvenience that the sound signal of a specific channel is not reproduced at all.
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[0055]
According to the inventions of claims 2 to 4 and 8 to 10, an output circuit for outputting audio
signals of a plurality of channels to a plurality of corresponding terminals, and a detection for
detecting one or a plurality of terminals not connected to the speaker Means, and a distribution
circuit for automatically distributing an audio signal to be supplied to the non-connection
terminal to at least one of the remaining terminals when the detection means detects the nonconnection terminal not connected to the speaker Audio Reproducing Apparatus With a relatively
simple configuration, it is possible to reliably detect a speaker not connected to the audio
reproducing apparatus, that is, a channel to which the speaker is to be originally connected.
[0056]
According to the inventions of claims 5 and 11, a computer system such as a personal computer
can easily provide a powerful sound like a cinema sound system like a home theater system as in
a home theater system. But it will be reproducible.
According to the sixth and twelfth aspects of the invention, the sound signal with six or more
channels makes it possible to reproduce a powerful sound with a sense of realism like a movie
theater sound system even at home or the like.
[0057]
Therefore, according to the present invention, an audio signal to be reproduced from an
unconnected speaker is automatically transmitted to another speaker even if all the speakers to
be originally connected to the audio reproduction device are not connected for any reason. By
distributing and reproducing, it is possible to reproduce the sound of each channel without
significantly reducing the sense of reality, and it is possible to reliably prevent the inconvenience
that the audio signal of a specific channel is not reproduced at all.
[0058]
Brief description of the drawings
[0059]
1 is a block diagram showing the main part of a first embodiment of the audio reproduction
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apparatus according to the present invention.
[0060]
2 is a perspective view showing a front portion of the first embodiment of the audio reproduction
device.
[0061]
3 is a perspective view showing the rear of the first embodiment of the audio reproduction
device.
[0062]
4 is a block diagram showing a first embodiment of the power amplifier.
[0063]
5 is a block diagram showing a second embodiment of the power amplifier.
[0064]
6 is a block diagram showing a third embodiment of the power amplifier.
[0065]
7 is a block diagram showing a fourth embodiment of the power amplifier.
[0066]
8 is a block diagram showing a second embodiment of the audio reproduction apparatus
according to the present invention.
[0067]
9 is a block diagram showing a third embodiment of the audio reproduction apparatus according
to the present invention.
[0068]
Explanation of sign
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[0069]
DESCRIPTION OF SYMBOLS 1 audio ¦ voice reproduction apparatus 2 recording-medium driver 3
AC-3 demodulator 4 AC-3 decoder 5 power amplifier 10 speaker group 25 output terminal group
26 input terminal 31 sensor 32 control part 33 mute circuit 34, 35, 61-66 mixer circuit 51 5656
amp 71 current detection circuit R, L, C, RS, LS, SW, CR, CL Speaker
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