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DESCRIPTION JP2014096735

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DESCRIPTION JP2014096735
Abstract: An apparatus capable of effectively processing and reproducing an audio signal with
the number of amplifiers smaller than the number of channels of multi-channel audio data is
provided. SOLUTION: A DSP 10 of an AV amplifier 5 as an audio processing device generates a
surround expansion audio signal S2 from a surround audio signal according to a select signal.
The preout unit 11 selectively outputs any one of the surround back audio signal SB, the outer
audio signal FW, and the surround expansion audio signal S2 to the power amplifier 12 and
amplifies it. The number of power amplifiers 12 is reduced by sharing the power amplifiers 12
with the surround back audio signal SB, the outer audio signal FW, and the surround expansion
audio signal S2. [Selected figure] Figure 4
Voice processing device
[0001]
The present invention relates to an audio processing apparatus that reproduces and processes
multi-channel audio data.
[0002]
2. Description of the Related Art An audio reproduction system or a home theater system
including a player such as a BD (Blu-ray) player, an AV amplifier, a speaker system, and a display
device is known.
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The audio data transmitted from the player to the AV amplifier is obtained by encoding multichannel audio data. The multi-channel audio data includes, for example, the left audio signal FL,
the right audio signal FR, the central audio signal C, the low-pass audio signal LFE, the surround
left audio signal SL, and the surround right audio signal SR. Configure 1ch audio data.
[0003]
On the other hand, in recent years, HD related audio formats such as Dolby True HD, Dolby
Digital Plus, and DTS-HD used in BD players and the like are also expanding, and in these
formats, surround back left audio signal SBL, A surround back right audio signal SBR, an outer
left audio signal FWL, an outer right audio signal FWR, an upper left audio signal FHL, and an
upper right audio signal FHR are added. The abbreviation of each signal is for convenience in the
present application.
[0004]
However, in the configuration in which amplifiers corresponding to audio signals of all the
channels are provided in the AV amplifier, amplifiers for 11.1 channels in total must be provided,
which increases the cost of the AV amplifier and the cost of the entire system. Become. In
addition, similar problems may occur when another audio signal is added instead of or in
addition to any of the above-mentioned extension channels.
[0005]
Patent No. 4996759 Patent No. 4471030
[0006]
In order to solve the problem that the cost of the AV amplifier increases as the number of
channels of multi-channel audio data increases, it is effective to reduce the number of amplifiers
by sharing audio signals of a plurality of channels by one amplifier. It is
However, in this case, among the various combinations of a plurality of channels, it becomes a
major issue which channel combination an amplifier is shared. It is required to reduce the
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2
number of amplifiers while effectively reproducing multichannel audio data without impairing
the listener's sense of hearing.
[0007]
An object of the present invention is to provide an apparatus capable of effectively reproducing
and processing an audio signal with the number of amplifiers smaller than the number of
channels of multi-channel audio data.
[0008]
The present invention comprises a first amplification unit for amplifying and outputting a
surround left audio signal obtained from multi-channel audio data, and a second amplification
unit for amplifying and outputting a surround right audio signal obtained from the multi-channel
audio data. Surround extended left audio signal obtained by time delaying and / or level adjusting
the surround left audio signal, surround back left audio signal obtained from the multi-channel
audio data, and left outer audio signal obtained from the multi-channel audio data A first shared
amplification unit for selectively amplifying and outputting any one, a surround expanded right
audio signal obtained by time delaying and / or level adjusting the surround right audio signal,
and a surround back right obtained from the multi-channel audio data Audio signal and right
outer sound obtained from the multi-channel audio data A second common amplification unit
selectively amplifying and outputting one of the signals, an operation unit operable by a user,
and the first common amplification unit and the second common operation according to
operation signals from the operation unit. And a control unit that switches and controls a signal
to be amplified by the amplification unit.
[0009]
Further, according to the present invention, there is provided a first amplification section for
amplifying and outputting a surround left audio signal obtained from multi-channel audio data,
and a second amplification for amplifying and outputting a surround right audio signal obtained
from the multi-channel audio data. Section, surround expanded left audio signal obtained by time
delaying and / or level adjusting the surround left audio signal, upper left audio signal obtained
from the multi-channel audio data, and outer left audio signal obtained from the multi-channel
audio data A first shared amplification unit for selectively amplifying and outputting any of the
above, a surround expansion right audio signal obtained by time delaying and / or level adjusting
the surround right audio signal, and an upper right side obtained from the multi-channel audio
data Either an audio signal or an outer right audio signal obtained from the multi-channel audio
data Are amplified by the first common amplification unit and the second common amplification
unit according to the second common amplification unit that selectively amplifies and outputs
the signal, the user-operable operation unit, and the operation signal from the operation unit.
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And a control unit that switches and controls a signal to be switched.
[0010]
In one embodiment of the present invention, surround left audio data included in the multichannel audio data is time-delayed to generate the surround expanded left audio signal, and
surround right audio data included in the multi-channel audio data is generated. The processor is
characterized by comprising a processor that generates the surround expanded right audio signal
with a time delay.
[0011]
Further, according to the present invention, there is provided a first amplification section for
amplifying and outputting a surround left audio signal obtained from multi-channel audio data,
and a second amplification for amplifying and outputting a surround right audio signal obtained
from the multi-channel audio data. A first surround extended left audio signal obtained by time
delaying and / or level adjusting the surround left audio signal, a surround back left audio signal
obtained from the multi-channel audio data, and a left obtained from the multi-channel audio
data A first shared amplification unit for selectively amplifying and outputting any of the outside
audio signals, a first surround expanded right audio signal obtained by time delaying and / or
adjusting the surround right audio signal, and the multi-channel audio data Obtained from the
surround back right audio signal obtained from A second shared amplification unit for selectively
amplifying and outputting any of the right outer audio signals to be output and a second
surround extension left audio signal obtained by time delaying or level adjusting the surround
left audio signal to an external amplification unit In addition, according to the operation signal
from the pre-out unit that outputs the second surround expanded right audio signal obtained by
time delaying or level adjusting the surround right audio signal to the external amplification unit,
the user operable operation unit, and the operation unit A control unit configured to switch and
control a signal to be amplified by the first shared amplification unit and the second shared
amplification unit.
[0012]
In one embodiment of the present invention, surround left audio data included in the multichannel audio data is time-delayed by a first time to generate the first surround extended left
audio signal, and is included in the multi-channel audio data. The surround right audio data to be
delayed by a first time to generate the surround expanded right audio signal, and the surround
left audio data included in the multi-channel audio data is delayed by a second time for the
second A processor for generating a second surround expanded right audio signal by generating
a surround expanded left audio signal and delaying a surround right audio data contained in the
multi-channel audio data by a second time; .
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[0013]
According to the present invention, a surround expansion audio signal is generated from a
surround audio signal, and this is combined with a specific audio signal, amplified by a common
amplification unit (common amplifier), and output, thereby maintaining an surround effect while
maintaining the surround effect. The number can be reduced effectively.
[0014]
It is an explanatory view showing arrangement of AV amplifier and speaker in a 1st embodiment.
It is a block diagram of the audio reproduction system in a 1st embodiment.
It is a figure which shows typically the channel of the audio | voice signal in 1st Embodiment.
It is a block diagram of the audio processing part in 1st Embodiment.
It is a table figure which shows the correspondence of the audio | voice signal in 1st
Embodiment, a power amplifier, and a speaker.
It is explanatory drawing which shows arrangement | positioning of AV amplifier in 2nd
Embodiment, and a speaker.
It is a figure which shows typically the channel of the audio | voice signal in 2nd Embodiment.
It is a block diagram of the audio processing part in 2nd Embodiment. It is a table figure which
shows the correspondence of the audio | voice signal in 2nd Embodiment, a power amplifier, and
a speaker. It is a figure which shows typically the change of the surround signal position in 2nd
Embodiment. It is explanatory drawing which shows arrangement | positioning of AV amplifier in
3rd Embodiment, and a speaker. It is a figure which shows typically the channel of the audio |
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voice signal in 3rd Embodiment. It is a block diagram of the audio processing part in 3rd
Embodiment. It is a table figure which shows the correspondence of the audio | voice signal in
3rd Embodiment, a power amplifier, and a speaker.
[0015]
Hereinafter, embodiments of the present invention will be described based on the drawings.
However, the following embodiments are exemplifications, and the present invention is not
limited to the following embodiments.
[0016]
First Embodiment FIG. 1 shows an audio processing apparatus as a component of an audio
reproduction system or a home theater system provided with a BD player, an audio processing
apparatus, a speaker system, and a display apparatus according to this embodiment. And an
example of the arrangement of the speaker system. In the following description, the audio
processing apparatus will be described as the AV amplifier 1.
[0017]
The AV amplifier 1 as an audio processing apparatus includes a left speaker SL, a right speaker
SR, a center speaker SC, a low frequency speaker SSW, a surround left speaker SSL, a surround
right speaker SSR, a surround back left speaker SSBL, a surround back right speaker SSBR, The
left outer speaker SLW and the right outer speaker SRW are connected. Further, a surround
expansion left speaker S2L and a surround expansion right speaker S2R are connected to the AV
amplifier 1 for outputting an expansion surround signal obtained by expanding a surround sound
signal. The surround expanded left speaker S2L and the surround expanded right speaker S2R
are disposed closer to the AV amplifier 1 (forward side) as viewed from the listener than the
surround left speaker SL and the surround right speaker SR. The surround expanded left speaker
S2L and the surround expanded right speaker S2R may be configured in the same speaker
housing as the surround left speaker SL and the surround right speaker SR, or may be configured
in separate speaker housings. .
[0018]
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FIG. 2 shows the overall configuration of the audio reproduction system in the present
embodiment. The BD player 100, the AV amplifier 1, and the display device 200 comply with, for
example, the HDMI standard, and are mutually connected via an HDMI cable.
[0019]
The BD player 100 transmits HDMI data including multi-channel audio data and video data to the
AV amplifier 1.
[0020]
The AV amplifier 1 amplifies multi-channel audio data included in the HDMI data received from
the BD player 100 and outputs the amplified multi-channel audio data to the speaker group 300.
The speaker group 300 is the left speaker SL, the right speaker SR, etc. shown in FIG. The AV
amplifier 1 also transmits HDMI data including video data to the display device 200.
[0021]
The display device 200 displays video data included in the HDMI data received from the AV
amplifier 1.
[0022]
The AV amplifier 1 includes a control unit 2, an HDMI receiving unit 3, an HDMI transmitting
unit 4, an audio processing unit 5, an operation unit 6, a display unit 7, and HDMI terminals 8
and 9.
A speaker group 300 is connected to the AV amplifier 1.
[0023]
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The HDMI receiving unit 3 receives the HDMI data transmitted from the BD player 100,
generates the original video data from the HDMI data, and supplies the video data to the HDMI
transmitting unit 4. Also, the HDMI receiving unit 3 generates the original multi-channel audio
data from the HDMI data and supplies the generated multi-channel audio data to the audio
processing unit 5.
[0024]
The audio processing unit 5 decodes the multi-channel audio data supplied from the HDMI
receiving unit 3 and executes each processing such as sound processing, D / A conversion
processing, volume adjustment processing, amplification processing, etc. Provide the audio signal
of the channel.
[0025]
The audio signal of each channel in the present embodiment is a left audio signal FL, a right
audio signal FR, a central audio signal C, a low band audio signal LFE, a surround left audio signal
SL, a surround right audio signal SR, a surround back left audio signal SBL , Surround back right
audio signal SBR, left outside audio signal FWL, right outside audio signal FWR, and surround
extended left audio signal S2L generated from surround left audio signal SL, surround generated
from surround right audio signal SR An extended right audio signal S2R is included.
The surround expanded left audio signal S2L and the surround expanded right audio signal S2R
are not included in the multi-channel audio data of the HDMI data transmitted from the BD
player 100, and the audio processing unit 5 performs the multi-channel audio data of the HDMI
data These signals are generated from the surround left audio signal SL and the surround right
audio signal SL included in the above, and are signals generated according to the operation of the
operation unit 6 by the listener who is the user. Operate the operation unit 6 when the listener as
the user desires the output from the surround extended left speaker S2L and the surround
extended right speaker S2R in order to enjoy the sound having a sense of presence stably
regardless of the listening position, particularly the front and back position The audio processing
unit 5 generates the surround expanded left audio signal S2L from the surround left audio signal
SL according to the operation signal from the operation unit 6, and generates the surround
expanded right audio signal S2R from the surround right audio signal SR. Do.
[0026]
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Here, the surround back left audio signal SBL is an audio signal reproduced from the position of
the rear left of the listener who is the user, and the surround back right audio signal SBR is an
audio signal reproduced from the position of the rear right of the listener The left outside audio
signal FWL is an audio signal reproduced from the outside (left side) position of the left audio
signal, and the right outside audio signal FWR is an audio signal reproduced from the outside
(right side) position from the right audio signal It is a signal.
[0027]
The control unit 2 controls the operation of each unit of the AV amplifier 1.
[0028]
The operation unit 6 is configured of a user-operable button or knob, or a touch panel.
The control unit 2 comprehensively controls the operation of each unit of the AV amplifier 1
according to the operation signal from the operation unit 6.
Specifically, the control unit 2 is configured by a microprocessor. The operation unit 6 includes a
remote control as well as buttons and knobs provided on the front of the AV amplifier 1.
[0029]
The display unit 7 displays the operation state of the AV amplifier 1 and the entire audio
reproduction system on a liquid crystal panel or the like.
[0030]
FIG. 3 schematically shows the audio signal of each channel in the present embodiment.
The left voice signal FL, the right voice signal FR, the center voice signal C, the low-range voice
signal LFE, the left outer voice signal FWL, and the right outer voice signal FWR are located
forward with reference to the position of the listener who is the user. Also, the surround back left
audio signal SBL and the surround back right audio signal SBR are located behind the listener.
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Furthermore, the surround left audio signal SL and the surround extended left audio signal S2L
are located on the side left of the listener, and the surround right audio signal SR and the
surround extended right audio signal S2R are located on the side right of the listener.
[0031]
The surround expanded left audio signal S2L and the surround expanded right audio signal S2R
ensure the surround effect even when the listener who is the user is positioned closer to the AV
amplifier 1 (forward) than the surround left speaker SSL and the surround right speaker SSR. The
surround extended left audio signal S2L is a signal to be obtained, and is generated by copying
the surround left audio signal SL and performing a predetermined time delay process. Similarly,
the surround expanded right audio signal S2R is also generated by copying the surround right
audio signal SR and performing a predetermined time delay process.
[0032]
The audio signal in this embodiment is an audio signal of 11.1 ch in total as shown in FIG. 3. If it
is going to amplify all of these individually with an amplifier, a total of 12 amplifiers are needed
and the cost increases. Cause.
[0033]
Therefore, in the present embodiment, among the multi-channel audio signals, an amplifier is
shared for the left outside audio signal FWL, the surround back left audio signal SBL, and the
surround expansion left audio signal S2L, and the right outside audio signal FWR and surround
For the rear right audio signal SBR and the surround expanded right audio signal S2R, the
number of amplifiers is reduced by sharing the amplifier.
The amplifier is shared by the left outside audio signal FWL, the surround back left audio signal
SBL, and the surround expansion left audio signal S2L, and the amplifier is shared by the right
outside audio signal FWR, the surround back right audio signal SBR, and the surround expansion
right audio signal S2R By doing this, it becomes possible to amplify and output the audio signal
with only eight amplifiers in total. Moreover, the amplifier is shared by the left outside audio
signal FWL, the surround back left audio signal SBL, and the surround expansion left audio signal
S2L, and the amplifier by the right outside audio signal FWR, the surround back right audio
signal SBR and the surround expansion right audio signal S2R In addition to the left audio signal
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FL, the right audio signal FR, the center audio signal C, the low frequency audio signal LFE, the
surround left signal SL, and the surround right signal SR, the listener uses the left outside audio
signal FWL and the surround. One of the rear left audio signal SBL and the surround extended
left audio signal S2L, and the right outer audio signal FWR, the surround backward right audio
signal SBR, and the surround extended right audio signal S2R can be listened to, so that the basic
In addition to 5.1ch, it is possible to hear the surround effect which added 2ch further That.
Which of the left outside audio signal FWL, the surround back left audio signal SBL and the
surround expanded left audio signal S2L is processed by the shared amplifier, and the right outer
audio signal FWR and the surround backward right audio signal SBR and the surround expanded
right audio signal S2R The control unit 2 performs switching control in accordance with the
operation of the operation unit 6 by the listener.
[0034]
FIG. 4 shows the main configuration of the audio processing unit 5. In FIG. 4, the left audio signal
FL, the right audio signal FR, the central audio signal C, the low frequency audio signal, the
surround left audio signal SL, and the surround right audio signal are omitted because they are
the same as conventional. Further, the audio signal on the left side of the listener and the audio
signal on the right side of the listener have the same processing, so both are shown together in
the figure. For example, the surround back left audio signal SBL and the surround back right
audio signal SBR are collectively shown as SB, and the left outer audio signal FWL and the right
outer audio signal FWR are collectively shown as FW, and the surround extended left audio
signal S2L and surround The extended right audio signal S2R is collectively shown as S2, and the
surround left audio signal SL and the surround right audio signal SR are collectively shown as S.
Therefore, it should be understood that FIG. 4 shows any of the left and right audio signals of the
surround back audio signal, the outer audio signal, and the surround extension signal.
[0035]
The audio processing unit 5 includes a DSP 10, a pre-out unit 11, a power amplifier 12, a speaker
relay 13, and a speaker terminal 14.
[0036]
The DSP 10 is provided at the front stage of the pre-out unit 11, decodes and D / A converts
multi-channel audio data supplied from the HDMI receiving unit 3, and generates an audio signal
of each channel.
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In particular, the DSP 10 generates a surround expanded audio signal S2 from the surround
audio signal S. The DSP 10 supplies the generated audio signal of each channel to the pre-out
unit 11. Specifically, when the operation unit 6 is operated such that the listener who is the user
requests the output of the surround expansion signal, a selection signal corresponding to the
operation is output from the operation unit 6. The DSP 10 copies the surround sound signal S in
accordance with the select signal and generates a surround expanded sound signal S2 by
delaying the time. In practice, as described above, the surround expanded left audio signal S2L is
generated from the surround left audio signal SL, and the surround expanded right audio signal
S2R is generated from the surround right audio signal SR. The DSP 10 supplies the generated
surround enhancement signal S2 to the signal path of the surround back audio signal SB and the
outer audio signal FW. The surround sound signal S is separately supplied to the signal path of
the surround sound signal S in the same manner as in the prior art.
[0037]
The preout unit 11 includes a plurality of changeover switches. One of the surround back audio
signal SB, the outer audio signal FW, and the surround expansion signal S2 is selectively output
by the changeover switch, and the volume is adjusted and supplied to the power amplifier 12.
The changeover switch is controlled by the control unit 2 in accordance with the operation of the
operation unit 6 by the listener. When the listener selects the surround back audio signal SB, the
control unit 2 controls to switch the changeover switch so that the surround back audio signal SB
is selectively supplied to the power amplifier 12. When the listener selects the outer audio signal
FW, the control unit 2 switches and controls the changeover switch so that the outer audio signal
FW is selectively supplied to the power amplifier 12. In addition, when the listener selects the
surround expansion audio signal S2, the control unit 2 controls to switch the changeover switch
so that the surround expansion signal S2 is selectively supplied to the power amplifier 12.
Therefore, any one of the surround back audio signal SB, the outer audio signal FW, and the
surround expansion audio signal S2 is alternatively selected and supplied to the power amplifier
12.
[0038]
Zone 2 is a function used when reproducing an audio signal in another room (Zone 2) different
from the room where the AV amplifier 1 and the speaker group are arranged shown in FIG. 1,
and is for Zone 2 supplied from DSP 10 An audio signal is selectively supplied to the power
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amplifier 12. In addition, Bi-AMP is a case where a Bi-AMP function is used, and the audio signal
for Bi-AMP is selectively supplied to the power amplifier 12. Therefore, the power amplifier 12 in
the present embodiment is not only shared by the surround back audio signal SB, the outer audio
signal FW, and the surround extension signal S2, but the surround rear audio signal SB, the outer
audio signal FW, the surround extension signal S2, It can be said that the Zone 2 audio signal and
the Bi-AMP audio signal are shared. Since the Zone 2 function and the Bi-AMP function are
known, a case where one of the surround back audio signal SB, the outer audio signal FW, and
the surround extension signal S2 is selectively supplied will be described below.
[0039]
The power amplifier 12 amplifies any one of the surround back audio signal SB, the outer audio
signal FW, and the surround expansion signal S2 supplied from the pre-out unit 11 and supplies
the amplified signal to the speaker relay 13.
[0040]
The speaker relay 13 includes a plurality of changeover switches.
The first changeover switch connects the power amplifier 12 and the surround rear audio signal
speaker terminal SB. The second changeover switch connects the power amplifier 12 and the
external audio signal speaker terminal FW. The third changeover switch connects the power
amplifier 12 and the surround expansion audio signal speaker terminal S2. The changeover
switch of the speaker relay 13 is switch-controlled by the control unit 2 in accordance with the
operation of the operation unit 6 by the listener. When the listener selects the surround back
audio signal SB, the control unit 2 selectively turns on the first changeover switch so that the
surround back audio signal SB amplified by the power amplifier 12 is used as the speaker
terminal SB for the surround back audio signal. Supply to When the listener selects the outer
audio signal FW, the control unit 2 selectively turns on the second switch to supply the outer
audio signal FW amplified by the power amplifier 12 to the outer audio signal speaker terminal
FW. . In addition, when the listener selects the surround expansion audio signal S2, the control
unit 2 selectively turns on the third switch and the surround expansion signal S2 amplified by the
power amplifier 12 is a speaker terminal for the surround expansion audio signal. Supply to S2.
[0041]
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The speaker terminal 14 includes a surround back audio signal speaker terminal SB, an outer
audio signal speaker terminal FW, and a surround extension audio signal speaker terminal S2.
The surround rear speakers SSB and SSR shown in FIG. 1 are connected to the surround back
audio signal speaker terminals SB, and the outer speakers SLW and SRW shown in FIG. 1 are
connected to the outer audio signal speaker terminals FW. The surround expansion speakers S2L
and S2R shown in FIG. 1 are connected to the audio signal speaker terminal S2.
[0042]
As described above, when the listener operates the operation unit 6 to select the surround
expansion audio signal S2, the DSP 10 of the audio processing unit 5 responds to the operation
signal (select signal) from the operation unit 6 as a multi-channel audio signal. The surround
expanded left audio signal S2L is generated from the surround left audio signal SL included in
the above, and the surround expanded right audio signal S2R is generated from the surround
right audio signal and supplied to the pre-out unit 11. The control unit 2 controls the changeover
switch of the pre-out unit 11 according to the operation signal, selectively supplies the surround
expanded left audio signal S2L and the surround expanded right audio signal S2R to the power
amplifier 12 and amplifies the power amplifier 12 Do. Further, the control unit 2 controls the
changeover switch of the speaker relay 13 according to the operation signal, and outputs the
amplified surround expanded left audio signal S2L from the surround expanded left speaker S2L
via the speaker terminal 14 and is amplified. The surround expanded right audio signal S2R is
output from the surround expanded right speaker S2R via the speaker terminal 14.
[0043]
When the listener operates the operation unit 6 to select the surround back audio signal SB, the
DSP 10 of the audio processing unit 5 supplies the surround back left audio signal SBL and the
surround back right audio signal SBR to the pre-out unit 11. The control unit 2 controls the
changeover switch of the pre-out unit 11 according to the operation signal, selectively supplies
the surround back left audio signal SBL and the surround back right audio signal SBR to the
power amplifier 12 and amplifies it by the power amplifier 12 Do. Further, the control unit 2
controls the changeover switch of the speaker relay 13 according to the operation signal, and
outputs the amplified surround back left audio signal SBL from the surround back left speaker
SSBL through the speaker terminal 14 and is amplified. The surround back right audio signal SBR
is output from the surround back right speaker SSBR via the speaker terminal 14.
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[0044]
Furthermore, when the listener operates the operation unit 6 to select the outer audio signal FW,
the DSP 10 of the audio processing unit 5 supplies the left outer audio signal FWL and the right
outer audio signal FWR to the pre-out unit 11. The control unit 2 controls the changeover switch
of the pre-out unit 11 according to the operation signal, selectively supplies the left outside audio
signal FWL and the right outside audio signal FWR to the power amplifier 12, and amplifies the
power amplifier 12. Further, the control unit 2 controls the changeover switch of the speaker
relay 13 according to the operation signal, and outputs the amplified left outer audio signal FWL
from the left outer speaker SLW through the speaker terminal 14 and the amplified right The
outer audio signal FWR is output from the right outer speaker SRW via the speaker terminal 14.
[0045]
If there is a front or back width at the listening point, such as when multiple listeners are located
in the direction (forward) of the AV amplifier 1, etc., the listener will select S2; Let's choose the
FW. Of course, this is an example, and the listener can select any mode.
[0046]
FIG. 5 shows the correspondence between the audio signal of each channel, the power amplifier,
and the speaker in the present embodiment.
[0047]
As for the basic 5.1 channel, power amplifiers corresponding to the respective audio signals are
provided as in the prior art, amplified by these power amplifiers, and output from the respective
speakers.
That is, the left audio signal FL is amplified by the power amplifier for FL, and is output from the
left speaker SL. The right audio signal FR is amplified by the power amplifier for FR and output
from the right speaker SR. The central audio signal C is amplified by the C power amplifier and
output from the central speaker SC. The low frequency range audio signal LFE is amplified by the
LFE power amplifier and output from the low frequency range speaker SW. The surround left
audio signal SL is amplified by the SL power amplifier and output from the surround left speaker
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SSL. The surround right audio signal SR is amplified by the SR power amplifier and output from
the surround right speaker SSR.
[0048]
Also, with regard to the surround back left audio signal SBL, the left outside audio signal FWL,
and the surround extended left audio signal S2L, a common power amplifier is provided, which is
selectively amplified by the common power amplifier and output from each speaker . Also for the
surround back right audio signal SBR, the right outer audio signal FWR, and the surround
extended right audio signal S2R, a common power amplifier is provided, which is selectively
amplified by the common power amplifier and output from each speaker.
[0049]
Therefore, in the present embodiment, it is possible to reproduce a multichannel audio signal of
11.1 ch with a total of eight power amplifiers. If the power amplifier for low-pass audio signals is
excluded, it is possible to reproduce 11 channels of multi-channel audio signals with a total of 7
power amplifiers.
[0050]
The present embodiment is particularly suitable for a movie theater or the like having a wide
listening point, but the invention can be applied to general households as well.
[0051]
Further, in the present embodiment, the surround sound signal S is time-delayed by the DSP 10
to generate the surround sound signal S2, but not only the time delay but also its level is adjusted
to generate the surround sound signal S2. It is also good.
The surround expanded audio signal S2 is generated from digital surround audio data, but may
be generated from this analog signal after D / A conversion of the surround audio data and
conversion into an analog signal. However, in this case, only the level is adjusted and generated.
In short, the surround enhancement signal S2 is generated by performing the time delay and / or
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the level adjustment of the surround signal S. One preferred embodiment is to time delay and
level adjust the surround sound signal S to generate a surround expanded sound signal S2.
[0052]
As described above, in the present embodiment, the control unit 2 and the DSP 10 work together
to reproduce and process the audio signal with a small number of amplifiers, but the DSP 10 is a
select signal indicating that S2 is selected from the operation unit 6 Not only when the signal is
received, but also when it is not received, the surround sound signal S2 may be generated from
the surround sound signal S at all times. Whether or not the generated surround expansion audio
signal S2 is supplied to the power amplifier 12 is determined by the control unit 2 controlling the
changeover switch.
[0053]
In addition, when the listener does not select S, the control unit 2 can also set in advance a
priority order of which one of the surround back audio signal SB and the outer audio signal FW is
to be output to the power amplifier 12. For example, in the default state, the surround back audio
signal SB is preferentially supplied to the power amplifier 12 or the like.
[0054]
Furthermore, data indicating which mode of SB / FW / S2 is selected by the listener is stored in
the memory of the control unit 2, for example, volatile memory such as RAM, but this is stored in
non-volatile memory. Alternatively, the data may be held even when the power is turned off, and
the selection mode by the listener may be maintained even when the power is turned on again.
[0055]
Second Embodiment FIG. 6 shows the arrangement of the AV amplifier 1 and the speaker system
in the present embodiment.
A different point from FIG. 1 is that the upper left speaker SLH and the upper right speaker SRH
are further connected to the AV amplifier 1. The upper left speaker SLH outputs the upper left
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audio signal included in the multi-channel audio signal, and the upper right speaker SRH outputs
the upper right audio signal included in the multi-channel audio signal.
[0056]
FIG. 7 schematically shows an audio signal of each channel in the present embodiment. A
different point from FIG. 3 is that the upper left audio signal FHL and the upper right audio
signal FHR are further added. If the audio signals of each channel are respectively amplified, a
total of 14 power amplifiers are required, which increases the cost.
[0057]
Therefore, also in this embodiment, the power amplifier is reduced by using the power amplifier
as a shared amplifier for audio signals of a plurality of channels.
[0058]
FIG. 8 shows the main configuration of the audio processing unit 5 in the present embodiment.
[0059]
The DSP 10 is provided at the front stage of the pre-out unit 11, decodes and D / A converts
multi-channel audio data supplied from the HDMI receiving unit 3, and generates an audio signal
of each channel.
In particular, the DSP 10 generates a surround expanded audio signal S2 from the surround
audio signal S.
The DSP 10 supplies the generated audio signal of each channel to the pre-out unit 11.
Specifically, when the operation unit 6 is operated such that the listener who is the user requests
the output of the surround expansion signal, a selection signal corresponding to the operation is
output from the operation unit 6. The DSP 10 copies the surround sound signal S in accordance
with the select signal and generates a surround expanded sound signal S2 by delaying the time.
That is, the surround expanded left audio signal S2L is generated from the surround left audio
signal SL, and the surround expanded right audio signal S2R is generated from the surround
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right audio signal SR. The DSP 10 supplies the generated surround enhancement signal S2 to the
signal path of the upper audio signal FH and the outer audio signal FW.
[0060]
The preout unit 11 includes a plurality of changeover switches. Either of the surround back audio
signal SB and the outer audio signal FW is selectively output by the changeover switch, and the
volume is adjusted and supplied to the power amplifier 12. The changeover switch is controlled
by the control unit 2 in accordance with the operation of the operation unit 6 by the listener.
When the listener selects the surround back audio signal SB, the control unit 2 controls to switch
the changeover switch so that the surround back audio signal SB is selectively supplied to the
power amplifier 12. When the listener selects the outer audio signal FW, the control unit 2
switches and controls the changeover switch so that the outer audio signal FW is selectively
supplied to the power amplifier 12.
[0061]
Further, one of the upper audio signal FH and the outer audio signal FW is selectively output by
the changeover switch, and the volume is adjusted and supplied to the power amplifier 12.
Furthermore, one of the upper audio signal FH or the outer audio signal FW and the surround
expansion audio signal S2 is selectively output by another changeover switch, and the volume is
adjusted and supplied to the power amplifier 12. When the listener selects the surround
expansion signal S2, the control unit 2 switches and controls the switch so that the surround
expansion signal S2 is selectively supplied to the power amplifier 12. Zone 3 is used when voice
output is performed to another room different from Zone 2.
[0062]
In this embodiment, one of the surround back audio signal SB and the outer audio signal FW is
amplified by the amplifier 12a of the power amplifier 12, and one of the upper audio signal FH,
the outer audio signal FW, and the surround extension audio signal S2 is a power amplifier. It is
amplified by 12 other amplifiers 12b. Therefore, in the configuration of FIG. 4, the surround back
audio signal SB and the surround expansion signal S2 are not simultaneously amplified and
output, but as shown in FIG. 8, the surround back audio signal SB and the surround expansion
audio signal are according to this embodiment. In some cases, S2 may be amplified and output
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19
simultaneously. Further, in the present embodiment, the outer audio signal FW and the surround
expansion audio signal S2 may be simultaneously amplified and output.
[0063]
The power amplifier 12 includes an amplifier 12a and an amplifier 12b, and the amplifier 12a
amplifies one of the surround back audio signal SB and the outer audio signal FW supplied from
the pre-out unit 11 and supplies the amplified signal to the speaker relay 13. Further, the power
amplifier 12 amplifies any one of the upper audio signal FH, the outer audio signal FW, and the
surround expansion audio signal S2 by the amplifier 12 b and supplies the amplified signal to the
speaker relay 13.
[0064]
The speaker relay 13 includes a plurality of changeover switches. The first changeover switch
connects the amplifier 12 a of the power amplifier 12 and the surround rear audio signal speaker
terminal SB. The second changeover switch connects the amplifier 12 a of the power amplifier
12 and the speaker terminal FW for the outer audio signal. The third changeover switch connects
the amplifier 12 b of the power amplifier 12 and the speaker terminal FW for the outer audio
signal. The fourth changeover switch connects the amplifier 12 b of the power amplifier 12 to
the surround expanded audio signal speaker terminal S 2. The changeover switch of the speaker
relay 13 is switch-controlled by the control unit 2 in accordance with the operation of the
operation unit 6 by the listener.
[0065]
When the listener selects the surround back audio signal SB, the control unit 2 selectively turns
on the first changeover switch to use the surround back audio signal SB amplified by the
amplifier 12a of the power amplifier 12 for the surround back audio signal. The signal is
supplied to the speaker terminal SB. Further, the control unit 2 selectively turns on the third
changeover switch to output the outer audio signal FW amplified by the amplifier 12 b of the
power amplifier 12 to the outer audio signal speaker terminal FW. Alternatively, the control unit
2 may output the upper audio signal FH amplified by the amplifier 12 b of the power amplifier
12.
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20
[0066]
When the listener selects the surround expansion signal S2, the control unit 2 selectively turns
on the first changeover switch so that the surround rear audio signal SB amplified by the
amplifier 12a of the power amplifier 12 is used as a speaker for surround rear audio signal
Output to the terminal SB. Alternatively, the control unit 2 selectively turns on the second switch
to output the outer audio signal FW amplified by the amplifier 12 a of the power amplifier 12 to
the outer audio signal speaker terminal FW. Further, the control unit selectively turns on the
fourth changeover switch to output the surround expansion audio signal S2 amplified by the
amplifier 12b of the power amplifier 12 to the surround expansion audio signal speaker terminal
S2.
[0067]
When the listener selects the outside audio signal FW, the control unit 2 selectively turns on the
first changeover switch to set the surround back audio signal SB amplified by the power amplifier
12 to the surround back audio signal speaker terminal SB. Supply. Further, the control unit 2
selectively turns on the third changeover switch to supply the outer audio signal FW amplified by
the power amplifier 12 to the outer audio signal speaker terminal FW.
[0068]
FIG. 9 shows the correspondence between the audio signal of each channel, the power amplifier,
and the speaker in the present embodiment.
[0069]
As for the basic 5.1 channel, power amplifiers corresponding to the respective audio signals are
provided as in the prior art, amplified by these power amplifiers, and output from the respective
speakers.
That is, the left audio signal FL is amplified by the power amplifier for FL, and is output from the
left speaker SL. The right audio signal FR is amplified by the power amplifier for FR and output
from the right speaker SR. The central audio signal C is amplified by the C power amplifier and
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21
output from the central speaker SC. The low frequency range audio signal LFE is amplified by the
LFE power amplifier and output from the low frequency range speaker SW. The surround left
audio signal SL is amplified by the SL power amplifier and output from the surround left speaker
SSL. The surround right audio signal SR is amplified by the SR power amplifier and output from
the surround right speaker SSR.
[0070]
Also, with regard to the surround back left audio signal SBL and the left outer audio signal FWL,
a common power amplifier is provided, which is selectively amplified by the common power
amplifier and output from each speaker. Also for the surround back right audio signal SBR and
the right outer audio signal FWR, a common power amplifier is provided, which is selectively
amplified by the common power amplifier and output from each speaker.
[0071]
Also for the upper left audio signal FHL, the outer left audio signal FWL, and the surround
extended left audio signal S2L, a common power amplifier is provided, which is selectively
amplified by the common power amplifier and output from each speaker. Also for the right upper
audio signal FHR, the right outer audio signal FWR, and the surround expanded right audio signal
S2R, a common power amplifier is provided, which is selectively amplified by the common power
amplifier and output from each speaker.
[0072]
Therefore, in the present embodiment, it is possible to reproduce 13.1ch of multi-channel audio
signals with a total of 10 (9 channels in total, excluding 9 power amplifiers for low-pass audio
signals), that is, 9 channels.
[0073]
In the present embodiment, as described above, since the surround back audio signal SB and the
surround extension audio signal S2 can be simultaneously amplified and output by different
common power amplifiers, reproduction of 5 and 1 ch is possible. The position of the surround
sound signal can be changed between the time and the 7.1 ch playback.
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That is, at the time of reproduction of 7.1 ch, the surround back audio signal SB is reproduced
and the surround extension audio signal S is reproduced, and at the time of reproduction of 5.1
ch, the surround audio signal is reproduced.
[0074]
FIG. 10 schematically shows an audio signal of each channel in the case of this example. FIG. 10
(a) shows an audio signal at 7.1 channel reproduction, and FIG. 10 (b) shows an audio signal at
5.1 channel reproduction. In both figures, the audio signal amplified and output is indicated by
hatching. In FIG. 10A, the left audio signal FL, right audio signal FR, central audio signal C, low
band audio signal LFE, surround back left audio signal SBL, surround back right audio signal SBR,
surround expanded left audio signal S2L, surround The expanded right audio signal S2R is
output. On the other hand, in FIG. 10B, the left audio signal FL, the right audio signal FR, the
central audio signal C, the low band audio signal LFE, the surround left audio signal SL, and the
surround right audio signal SR are output. It should be noted that the positions of the surround
differ in FIGS. 10 (a) and 10 (b). By using the arrangement relationship of FIG. 10A, it is possible
to effectively use the audio signal of 7.1 ch to enhance the three-dimensional feeling and the
realism.
[0075]
Third Embodiment FIG. 11 shows the arrangement of the AV amplifier 1 and the speaker system
in the present embodiment. A different point from FIG. 6 is that a surround expansion speaker is
further connected to the AV amplifier 1. That is, assuming that the surround expansion speakers
S2L and S2R in FIG. 6 are first surround expansion speakers, in addition to this, the second
surround expansion audio speakers S3L and S3R are connected.
[0076]
The first surround sound extension audio signal S2 is amplified and output by the shared
amplifier of the AV amplifier 1 as in the second embodiment, but the second surround sound
extension audio signal S3 is an external amplifier different from the AV amplifier 1 It is amplified
and output. That is, the DSP 10 of the AV amplifier 1 generates the first surround sound
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expansion signal S2 from the surround sound signal S and generates the second surround sound
expansion signal S3 and supplies the generated signal to the pre-out unit 11. The pre-out unit 11
is connected to an external amplifier, and supplies the second surround sound signal S2 from the
pre-out unit 11 to the external amplifier for amplification. The second surround sound signal
amplified by the external amplifier is supplied to and output from the second surround sound
speakers S3L and S3R.
[0077]
FIG. 12 schematically shows an audio signal of each channel in the present embodiment. A
difference from FIG. 7 is that in addition to the surround left audio signal SL, the surround right
audio signal SR, the first surround expanded left audio signal S2L, and the first surround
expanded right audio signal S2R, the second surround expanded left audio signal S3L and The
point is that the 2 surround extended right audio signal S3R is added.
[0078]
FIG. 13 shows the main configuration of the audio processing unit 5 in the present embodiment.
[0079]
The DSP 10 is provided at the front stage of the pre-out unit 11, decodes and D / A converts
multi-channel audio data supplied from the HDMI receiving unit 3, and generates an audio signal
of each channel.
The DSP 10 generates a first surround enhancement audio signal S2 and a second surround
enhancement signal S3 from the surround audio signal S. The DSP 10 supplies the generated
audio signal of each channel to the pre-out unit 11. Specifically, when the operation unit 6 is
operated such that the listener who is the user requests the output of the surround expansion
signal, a selection signal corresponding to the operation is output from the operation unit 6. The
DSP 10 copies the surround sound signal S according to the select signal, and delays the time to
generate the first surround sound signal S2 and the second surround sound signal S3. The time
delay amounts of the first surround sound enhancement signal S2 and the second surround
sound enhancement signal S3 are different from each other. That is, according to the positional
relationship between the listener and the speaker, the surround audio signal S is delayed for a
first time to generate a first surround extension audio signal S2, and the surround audio signal S
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24
is delayed for a second time to generate a second A surround expanded audio signal S3 is
generated. The first time and the second time are adjusted in accordance with the positions of the
listener and the speaker, respectively. The DSP 10 supplies the generated first surround
enhancement signal S2 to the signal path of the upper audio signal FH and the outer audio signal
FW. Also, the DSP 10 supplies the generated second surround sound expansion signal S3 to the
signal path of the outer audio signal FW.
[0080]
The preout unit 11 includes a plurality of changeover switches. Either of the surround back audio
signal SB and the outer audio signal FW is selectively output by the changeover switch, and the
volume is adjusted and supplied to the amplifier 12 c of the power amplifier 12. The changeover
switch is controlled by the control unit 2 in accordance with the operation of the operation unit 6
by the listener.
[0081]
Further, one of the outside audio signal FW and the second surround sound extension audio
signal S3 is selectively output by another changeover switch, volume-adjusted, and supplied to an
external amplifier (not shown) and amplified.
[0082]
Furthermore, either the upper audio signal FH or the outer audio signal FW and the first
surround sound extension audio signal S2 are selectively output by another changeover switch,
and the volume is adjusted and supplied to the amplifier 12d of the power amplifier 12 .
[0083]
In the present embodiment, one of the surround back audio signal SB and the outer audio signal
FW is amplified by the power amplifier 12, and the upper audio signal FH, the outer audio signal
FW, and the first surround extension audio signal S2 are different powers. It is amplified by the
amplifier 12.
Furthermore, one of the outside audio signal FW and the second surround sound extension audio
signal S3 is amplified by the external amplifier.
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Therefore, also in the present embodiment, the surround back audio signal SB and the surround
extension audio signal S2 may be simultaneously amplified and output as in the second
embodiment, and the outer audio signal FW and the first surround extension audio signal may be
output. In some cases, S2 may be amplified and output simultaneously. In addition to this, in the
present embodiment, the second surround sound extension audio signal S3 may be
simultaneously amplified by the external amplifier and output.
[0084]
Specifically, when the listener selects the first surround expansion audio signal S2 and the
second surround expansion audio signal S3, the control unit 2 controls the changeover switch of
the pre-out unit 11 and the changeover switch of the speaker relay 13, The surround back audio
signal SB or the outer audio signal FW is amplified and output by the amplifier 12c, and the first
surround expansion audio signal S2 is amplified and output by the amplifier 12d, and the second
surround expansion audio signal S3 is amplified by the external amplifier. Output.
[0085]
FIG. 14 shows the correspondence between the audio signal of each channel, the power
amplifier, and the speaker in this embodiment.
[0086]
As for the basic 5.1 channel, power amplifiers corresponding to the respective audio signals are
provided as in the prior art, amplified by these power amplifiers, and output from the respective
speakers.
That is, the left audio signal FL is amplified by the power amplifier for FL, and is output from the
left speaker SL.
The right audio signal FR is amplified by the power amplifier for FR and output from the right
speaker SR. The central audio signal C is amplified by the C power amplifier and output from the
central speaker SC. The low frequency range audio signal LFE is amplified by the LFE power
amplifier and output from the low frequency range speaker SW. The surround left audio signal
SL is amplified by the SL power amplifier and output from the surround left speaker SSL. The
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surround right audio signal SR is amplified by the SR power amplifier and output from the
surround right speaker SSR.
[0087]
Also, with regard to the surround back left audio signal SBL and the left outer audio signal FWL,
a common power amplifier is provided, which is selectively amplified by the common power
amplifier and output from each speaker. Also for the surround back right audio signal SBR and
the right outer audio signal FWR, a common power amplifier is provided, which is selectively
amplified by the common power amplifier and output from each speaker.
[0088]
Also for the upper left audio signal FHL, the left outer audio signal FWL, and the first surround
extension left audio signal S2L, a common power amplifier is provided, which is selectively
amplified by the common power amplifier and output from each speaker. Ru. Also for the right
upper audio signal FHR, the right outer audio signal FWR, and the first surround extended right
audio signal S2R, a common power amplifier is provided, which is selectively amplified by the
common power amplifier and output from each speaker.
[0089]
Furthermore, with respect to the second surround extension left audio signal S3L and the left
outside audio signal FWL, a shared external amplifier is provided, which is selectively amplified
by the shared external amplifier and output from the speaker. The second surround extended
right audio signal S3R and the right outer audio signal FWR are also provided with the shared
external amplifier, selectively amplified by the shared external amplifier, and output from the
speaker.
[0090]
Also in the present embodiment, as shown in FIG. 10, it is possible to dynamically change the
position of the surround sound signal in accordance with the number of channels to be
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reproduced and output. For example, as shown in FIG. 10A, the surround back left audio signal
SBL, the surround back right audio signal SBR, the first surround expanded left audio signal S2L,
and the first surround expanded right audio signal S2R are output and additionally The second
surround extended left audio signal S3L and the second surround extended right audio signal
S3R are output. Alternatively, in FIG. 10A, the second surround expanded left audio signal S3L
and the second surround expanded right audio signal S3R are output instead of the first
surround expanded left audio signal S2L and the first surround expanded right audio signal S2R.
You may do so.
[0091]
As described above, in the present embodiment, the first surround extended audio signal S2 and
the second surround extended audio signal S3 are output in addition to the surround audio signal
S, so that the listener has a further width in the front-rear direction. Can also respond.
[0092]
The first surround sound signal S2 is generated by performing at least one of time delaying and
level adjustment of the surround sound signal S, but the second surround sound sound signal S3
is also generated by time delaying the surround sound signal S or It is generated by executing at
least one of the level adjustments.
In a preferred embodiment, the surround audio signal S is time-delayed and level-adjusted to
generate a first surround audio signal S2, and the surround audio signal S is time-delayed and
level-adjusted to generate a second surround extension audio signal. S3 is generated.
[0093]
Although the embodiments of the present invention have been described above, various
modifications are possible.
[0094]
For example, in the third embodiment, the first surround sound enhancement signal S2 and the
second surround sound enhancement signal S3 are generated from the surround sound signal S.
However, more surround sound enhancement signals can be generated as needed.
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In general, n (n is a natural number) surround enhanced audio signals can be generated from the
surround audio signal.
[0095]
1 AV amplifier, 2 control unit, 3 HDMI reception unit, 4 HDMI transmission unit, 5 audio
processing unit, 6 operation unit, 7 display unit, 100 BD player, 200 display device, 300 speaker.
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