JP2004056418

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DESCRIPTION JP2004056418
An object of the present invention is to prevent unnecessary surround signals from being
reproduced in a first zone, and to obtain sufficient multi-channel sound reproduction effects in a
second zone in which only a main speaker is installed. A control unit 8 controls a first mode
using a main speaker of a system B in a first zone in which a main speaker of a system A and a
surround speaker are installed, and a main speaker of a system B in a second zone. The mode
setting unit can select any one of the second modes used independently. When the output to the
speaker output terminal of the A channel is off, the output to the speaker output terminal of the
B channel is on, and the second mode is selected, the DSP 3a stops the supply of the surround
signal to the surround speaker. , And adds sound effects to the main signals L and R. [Selected
figure] Figure 1
Sound reproduction device
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction apparatus having a multi-channel audio reproduction function, and more
particularly to an audio reproduction apparatus capable of independently controlling on / off
output to two speaker output terminals. It is a thing. [0002] In recent years, as a multi-channel
sound reproduction system, digital using audio compression technology such as Dolby
(registered trademark) digital, DTS (registered trademark) (Digital Theater Systems), AAC
(Advanced Audio Coding), etc. Surround systems are in widespread use. On the other hand,
recently, multi-zone sound reproduction systems that distribute sound signals to a plurality of
rooms using a single amplifier have also begun to spread. Conventionally, when the multi-zone
sound reproduction function is realized using a sound reproduction apparatus, the A system of
the main speaker is disposed in the first zone (area), and the B system of the main speaker is
disposed in the second zone. Thus, the output to the main speaker of system A and the output to
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the main speaker of system B are independently controlled on / off by the main speaker
changeover switch of the sound reproducing apparatus. FIG. 10 is a block diagram showing the
configuration of a conventional sound reproducing apparatus. When the analog audio signals
ALIN and ARIN of two channels are input to the input terminals 1-1 and 1-2, the A / D converter
2 converts the analog audio signals ALIN and ARIN into digital audio signals, and the converted
digital signals The audio signal is input to a digital signal processor (hereinafter referred to as a
DSP) 3 and subjected to sound field processing as required. On the other hand, when the digital
audio signal DIN compressed and encoded by Dolby Digital, DTS or AAC is input to the input
terminal 1-3, the DSP 3 decompresses the compression encoded digital audio signal DIN by an
internal decoder (not shown) Decode the analog audio signals of main signal L (left), R (right),
rear signal RL (rear left), RR (rear right), center signal C (center), and subwoofer signal LFE (low
frequency) Generate Here, when the DSP 3 is set to off (or downmix) (two-channel sound
reproduction), the main signals L and R are output, and the DSP 3 is set to on (multi-channel
sound reproduction). In this case, the main signals L and R, the rear signals RL and RR, the center
signal C, and the subwoofer signal LFE are output. When sound reproduction is to be performed
in the first zone, the main speaker changeover switches 6-1 and 6-2 are turned on.
The main signals L and R are amplified by the power amplifiers 4-1 and 4-2, respectively, and
output from the speaker output terminals 5-1 and 5-2 through the main speaker changeover
switches 6-1 and 6-2. When multi-channel sound reproduction is performed, the rear signals RL
and RR output from the DSP 3 and the center signal C are respectively amplified by the power
amplifiers 4-3, 4-4 and 5-5, and the speaker output terminals 5-5 are output. The subwoofer
signal LFE output from the DSPs 3, 5, 5, and 5-5 is output from the subwoofer output terminal 7.
On the other hand, in the case of distributing an audio signal to the second zone, the main
speaker switching switches 6-3 and 6-4 are turned on. In this case, the main signals L and R
output from the DSP 3 are amplified by the power amplifiers 4-1 and 4-2, respectively, and are
output through the main speaker changeover switches 6-3 and 6-4 to the speaker output
terminals 5-6, It is output from 5-7. FIG. 11 is a plan view showing a speaker arrangement of a
first zone ZoneA capable of multi-channel sound reproduction and a second zone ZoneB capable
of two-channel sound reproduction. In FIG. 11, U indicates the trial position. When performing
multi-channel sound reproduction in the first zone ZoneA, the main signals L and R, the rear
signal RL, and the like output from the speaker output terminals 5-1, 5-2, 5-3, 4 and 5-5. The RR
and center signal C are respectively supplied to the main speakers SP-AL and SP-AR, the rear
speakers SP-RL and SP-RR, and the center speaker SP-C. The subwoofer signal LFE output from
the subwoofer output terminal 7 is supplied to a subwoofer SP-SW incorporating an amplifier. On
the other hand, when distributing audio signals of two channels to the second zone Zone B, the
main signals L and R outputted from the speaker output terminals 5-6 and 5-7 are respectively
transmitted to the speakers SP-BL and SP-BR. Supplied. As described above, in the conventional
sound reproducing apparatus, the outputs to the main speakers SP-AL and SP-AR of the A system
and the main speakers SP-BL and SP of the B system are used. Although the on / off control can
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be performed independently with the output to BR, it is considered whether the speakers SP-BL
and SP-BR of the B system are in the first zone ZoneA or in the second zone ZoneB. It was not.
Therefore, in a state where the speakers SP-AL and SP-AR of the A system are disposed in the
first zone ZoneA and the speakers SP-BL and SP-BR of the B system are disposed in the second
zone ZoneB, the first When DSP3 is turned on in zone ZoneA and multi-channel sound
reproduction is being performed, only the surround signal is reproduced in the first zone ZoneA
when the output to the speakers SP-AL and SP-AR of the A system is turned off. There was a
problem of that.
Further, in the conventional sound reproducing apparatus, when the speakers SP-BL and SP-BR
of the B system are arranged in the second zone ZoneB, the surround signal can not be
reproduced in the second zone ZoneB, and the second There is a problem that multi-channel
sound reproduction effects can not be obtained in zone ZoneB. The present invention has been
made to solve the above problems, and in an audio reproduction apparatus capable of
independently controlling on / off of outputs to two speaker output terminals, a zone in which
the two main speakers are different. Output to the first speaker output terminal connected to the
main speaker in the first zone is off, and output to the second speaker output terminal connected
to the main speaker in the second zone is on In this case, it is an object to prevent unnecessary
surround signals from being reproduced in the first zone. Another object of the present invention
is to obtain a sufficient multi-channel sound reproduction effect in the second zone in which only
the main speaker is installed. SUMMARY OF THE INVENTION According to the present invention,
sound reproduction is performed by supplying a main signal to be reproduced from the front of a
listener to a main speaker and supplying a surround signal giving surround feeling to a listener
to a surround speaker. A digital signal processor (DSP) for outputting the surround signal, a
power amplifier for amplifying the main signal, an output from the power amplifier to a first (Asystem) speaker output terminal, and A switch for independently controlling on / off of the
output to the speaker output terminal of system B), a speaker connected to the first speaker
output terminal, and a speaker connected to the second speaker output terminal In a first zone,
and a speaker connected to the first speaker output terminal as a first mode. And a mode setting
unit capable of selecting one of two modes of the second mode in which the speaker connected
to the second speaker output terminal is arranged in the second zone and used. When the output
to the first speaker output terminal is off, the output to the second speaker output terminal is on,
and the second mode is selected, the DSP outputs the surround signal. To stop. In one
configuration example of the sound reproduction device according to the present invention, the
DSP is configured such that the output to the first speaker output terminal is off and the output
to the second speaker output terminal is on, and When the second mode is selected, an effect
sound is added to the main signal.
BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment Hereinafter, an
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embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of a sound reproducing apparatus according
to a first embodiment of the present invention. The sound reproducing apparatus according to
the present embodiment includes an input terminal 1 (1-1, 1-2, 1-3), an A / D converter 2, a DSP
3a, and a power amplifier 4 (4-1, 4-, 4-, 4- 3, 4-4, 4-5), speaker output terminal 5 (5-1, 5-2, 5-3,
5-4, 5-5, 5-5, 5- 7), main speaker changeover switch 6 (6-1, 6-2, 6-3, 6-4), has a subwoofer
output terminal 7 and a control unit 8. Hereinafter, the main speaker changeover switches 6-1
and 6-2 are spA, and the main speaker changeover switches 6-3 and 6-4 are spB. The control
unit 8 serves as mode setting means for setting the use place of the main speaker of the B
system. Also, the DSP 3a has an output to the main speaker of system A off (spA is off) and an
output to the main speaker of system B on (spB is on), and will be described later as an
arrangement location of the main speaker on system B. When "Zone B" is selected, the supply of
the surround signal is stopped. The present embodiment is an apparatus for performing 5.1channel sound reproduction, which is a typical example of multi-channel sound reproduction, in
which analog audio signals ALIN and ARIN of two channels are input terminals 1-1, 1-. 2, the A /
D converter 2 converts the analog audio signals ALIN and ARIN into digital audio signals, and the
converted digital audio signals are input to the DSP 3a, and sound field processing is performed
as necessary. However, since this is not a multi-channel audio input intended by the present
invention, the description will be omitted. On the other hand, when the digital audio signal DIN
compressed and encoded by Dolby Digital, DTS or AAC is input to the input terminal 1-3, the DSP
3 a decompresses the compressed encoded digital audio signal DIN by an internal decoder (not
shown) Decoding is performed to generate analog audio signals of main signals L and R, rear
signals RL and RR, center signal C, and subwoofer signal LFE. Here, when the DSP 3a is set to off
(or downmix), the main signals L and R are output, and when the DSP 3a is set to on (multichannel sound reproduction), the main signal L is output. , R, rear signals RL, RR, center signal C,
and subwoofer signal LFE. The speaker arrangement of the first zone ZoneA and the second zone
ZoneB is as shown in FIG.
The speaker output terminals 5-1, 5-2, 5-3, 4-5 and 5-5 are the main speakers SP-AL and SP-AR
of the first zone ZoneA, the rear speakers SP-RL and SP-RR, The subwoofer output terminal 7 is
connected to the center speaker SP-C, and is connected to the subwoofer SP-SW incorporating an
amplifier. The speaker output terminals 5-6 and 5-7 are connected to the main speakers SP-BL
and SP-BR in the second zone ZoneB. [0015] "Zone A" and "Zone B" are considered as the
arrangement locations of the main speakers of the B system. When the user (listener) places the
main speakers SP-BL and SP-BR of the B system in the second zone Zone B as shown in FIG. 11,
the user operates the sound reproducing apparatus to use the main speakers of the B system. Set
the mode to "Zone B". At this time, the control unit 8 of the sound reproduction device makes the
mode switching signal MSEL valid. In addition, when the main speakers SP-BL and SP-BR of the B
system are installed in the first zone ZoneA and listening and comparison with the main speakers
SP-AL and SP-AR of the A system are performed, the B system Set the main speaker usage mode
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to "MAIN". At this time, the control unit 8 invalidates the mode switching signal MSEL. In the
following description, the main speakers SP-AL and SP-AR of system A are disposed in the first
zone ZoneA, and the main speakers SP-BL and SP-BR of system B are disposed in the second zone
ZoneB. It will be assumed that the DSP 3a is set to ON. In this case, there are four cases: spA is
on, spB is on, spA is on, spB is off, spA is off, spB is on, spA is off, and spB is off. The state is
considered. [When spA is on and spB is off] When the user performs sound reproduction using
the main speaker of system A in the first zone Zone A, the user selects one of the main speaker
selection buttons (not shown) of the sound reproduction device. Press "A". FIG. 2 is a flowchart
showing the operation of the sound reproduction apparatus when the main speakers are
switched. When the main speaker selection button "A" is pressed and the main speaker selection
button "B" is not pressed (NO in step S1 in FIG. 2 and YES in step S2), the control unit 8 controls
the main speaker of system A The selection signal SSELA is validated, and the main speaker
selection signal SSELB of the B system is invalidated (step S3).
When the main speaker selection signal SSELA of A system is valid, the main speaker switching
switch spA of A system is turned on, and when the main speaker selection signal SSELB of B
system is invalid, the main speaker switching switch spB of B system is It turns off (step S4).
Further, the DSP 3a outputs the main signals L and R, the rear signals RL and RR, the center
signal C, and the subwoofer signal LFE (step S5). The main signals L and R, the rear signals RL
and RR, and the center signal C output from the DSP 3a are amplified by the power amplifiers 41, 4-2, 2-4, 3-4, 4-5, respectively, and the speaker output It is output from the terminals 5-1, 5-2,
5-3, 5 and 4-5. The subwoofer signal LFE output from the subwoofer output terminal 7 is
supplied to a subwoofer SP-SW incorporating an amplifier. Thus, 5.1 channel sound reproduction
is performed in the first zone ZoneA. [When spA is off and spB is on] On the other hand, when
performing sound reproduction in the second zone Zone B, the user presses B of the main
speaker selection button of the sound reproduction device, and the main speaker selection button
Do not press "A" on When the main speaker selection button "B" is pressed and the main speaker
selection button "A" is not pressed (YES in step S1, NO in step S6), the control unit 8 selects the
main speaker selection signal of system A. The SSELA is invalidated, and the main speaker
selection signal SSELB of B system is validated (step S7). When the main speaker selection signal
SSELA of system A is invalid, the main speaker switching switch spA of system A is off, and when
the main speaker selection signal SSELB of system B is valid, the main speaker switching switch
spB of system B is on (Step S8). On the other hand, when the main speaker selection signal SSELA
of system A is invalid, the main speaker selection signal SSELB of system B is valid, and mode
switching signal MSEL is valid (YES in step S9), DSP 3a generates rear signal RL. , RR, the center
signal C, and the subwoofer signal LFE, the output of surround signals is stopped (step S10).
Further, the DSP 3a adds sound effects to the main signals L and R (step S11). The main signals L
and R to which the sound effects are added are respectively amplified by the power amplifiers 41 and 4-2, pass through the main speaker changeover switch spB, and the mains of the B system
from the speaker output terminals 5-6 and 5-7. The speaker SP-BL and SP-BR are supplied.
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Here, the concept of the sound effect addition process for the main signals L and R will be
described. In order to reproduce 5.1-channel multi-channel sound reproduction with the 2channel main speakers SP-BL and SP-BR, the rear signals RL and RR, the center signal C and the
subwoofer signal LFE are distributed to the main signals L and R. It will be necessary to supply.
Since the center signal C, which is an audio signal for the center speaker SP-C, may be localized
between L and R, it may be distributed to the main signals L and R, and a subwoofer signal for
the subwoofer SP-SW. Since localization of the sound image is not a problem for LFE too, it may
be distributed to the main signals L and R. On the other hand, when the rear signals RL and RR
are output from the main speakers SP-BL and SP-BR and the sound image is localized at the
positions of the rear speakers SP-RL and SP-RR, respectively, the frequency of the audio signal It
is necessary to convert the characteristics and delay time into the characteristics of the sound
heard from the rear. That is, the user learns empirically to estimate the direction, distance, etc. of
the sound according to the time difference or the frequency component of the sound heard to the
left and right ears, and the rear signals RL and RR are used as the main speakers SP- When
realizing a so-called virtual speaker that outputs sound from BL and SP-BR and localizes a sound
image so that sound is heard from behind, rear signals RL and RR are actually used as rear
speakers SP-RL and SP-. It is necessary to process it so as to have a time difference and a
frequency component to be transmitted to the user when it is output from RR, and to supply it to
the main speakers SP-BL and SP-BR. Hereinafter, the details of the sound effect addition process
will be described. FIG. 3 is a view showing an example of the sound effect addition processing of
the DSP 3a to the main signals L and R. FIG. 3 is a graphic representation of the processing of the
DSP 3a and does not necessarily show the actual configuration of the DSP 3a. The center signal C
is divided by the adder circuit 301 and added to the main signals L and R. Similarly, the
subwoofer signal LFE is divided by the adder circuit 302 and added to the main signals L and R.
In filter 303, filter coefficients are simulated, which are simulated head-to-head transfer
functions, which are acoustic characteristics from the rear speaker SP-RL to the left ear of the
user, using a standard model of the user's head shape. There is. Thereby, the rear signal RL is
filtered by the filter 303 so as to have a frequency characteristic and a delay time when it is
output from the rear speaker SP-RL and reaches the user's left ear.
In the filter 304, filter coefficients obtained by simulating a head-related transfer function, which
is a characteristic of sound from the rear speaker SP-RL to the user's right ear, using the standard
model are set in advance. Thereby, the rear signal RL is filtered by the filter 304 so as to have a
frequency characteristic and a delay time when it is output from the rear speaker SP-RL and
reaches the right ear of the user. In the filter 305, filter coefficients obtained by simulating a
head-related transfer function, which is an acoustic characteristic from the rear speaker SP-RR to
the right ear of the user, using the standard model are set in advance. Thereby, the rear signal RR
is filtered by the filter 305 so as to have a frequency characteristic and a delay time when it is
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output from the rear speaker SP-RR and reaches the right ear of the user. In the filter 306, filter
coefficients obtained by simulating a head-related transfer function, which is a characteristic of
sound from the rear speaker SP-RR to the left ear of the user, using the standard model are set in
advance. Thereby, the rear signal RR is filtered by the filter 306 so as to have a frequency
characteristic and a delay time when it is output from the rear speaker SP-RR and reaches the
user's left ear. The rear signal RL filtered by the filter 303 and the rear signal RR filtered by the
filter 306 are added by the adder 307 and the crosstalk cancellation circuit 309 removes the
crosstalk component, and then the adder 310 It is added to the main signal L. Also, the rear
signal RR filtered by the filter 305 and the rear signal RL filtered by the filter 304 are added by
the adder 308 and the crosstalk cancellation circuit 309 removes the crosstalk component, and
then the adder 311 performs main processing. It is added to the signal R. The DSP 3 a outputs
the main signals L and R to which the sound effects are added as described above. The main
signals L and R output from the DSP 3a are supplied to the main speakers SP-BL and SP-BR via
the power amplifiers 4-1 and 4-2, respectively. As described above, in the present embodiment,
the main speakers SP-BL and SP-BR of the B system are disposed in the second zone ZoneB, and
the usage mode of the main speaker of the B system is set to "Zone B". If the output to the main
speaker of system A is off and the output to the main speaker of system B is on, the rear signals
RL and RR to the first zone Zone A, the center signal C, and the subwoofer signal LFE Since the
supply of each surround signal is stopped, it is possible to prevent an unnecessary surround
signal from being reproduced in the first zone ZoneA.
Also, by adding sound effects to the main signals L and R, it is possible to reproduce the realism
of multi-channel sound reproduction with the two channel main speakers SP-BL and SP-BR in the
second zone ZoneB. . [When spA is on and spB is on] The control unit 8 of the sound reproducing
apparatus performs a process when both A and B of the main speaker selection button
are pressed (YES in step S1, in step S6) YES), both the main speaker selection signals SSELA and
SSELB are enabled (step S13). When the main speaker selection signals SSELA and SSELB are
valid, the main speaker switching switches spA and spB are turned on (step S14). The DSP 3a
outputs the main signals L and R, the rear signals RL and RR, the center signal C, and the
subwoofer signal LFE as they are (step S15). This makes it possible to use the main speakers SPAL and SP-AR of the A system, the rear speakers SP-RL and SP-RR, the center speakers SP-C, and
the subwoofer SP-SW to use 5.1 channels in the first zone ZoneA. At the same time as sound
reproduction is performed, 2-channel sound reproduction is performed in the second zone ZoneB
using the main speakers SP-BL and SP-BR of the B system. [When spA is off and spB is off] If the
main speaker selection buttons A and B are not both pressed (NO in step S 1, NO in step
S 2) And the main speaker selection signals SSELA and SSELB are both disabled. Therefore, the
main speaker switching switches spA and spB are turned off, and no sound is output. In the
above, the case where the main speaker of system B is disposed in the second zone ZoneB has
been described. It goes without saying that the main speakers SP-BL and SP-BR of the B system
may be disposed together with the main speakers SP-AL and SP-AR of the A system in the first
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zone ZoneA. In this case, as described above, the usage mode of the main speaker of the B system
is set to "MAIN". When the use mode of the main speaker of the B system is set to "MAIN", the
DSP 3a is not concerned with the arrangement location of the main speaker of the B system, the
main signals L and R, rear signals RL and RR, center signal C, subwoofer The signal LFE is output
as it is. Therefore, the operation in the case of simultaneously using the main speakers of the A
system and the B system is the above-mentioned step S13 except that the speakers SP-BL and SPBR of the B system are disposed in the first zone ZoneA. Same as ˜ S15.
On the other hand, when the usage mode of the main speaker of the B system is set to MAIN
and only the B of the main speaker selection button is pressed, the determination NO in step
S9 of FIG. L, R, rear signals RL, RR, center signal C, subwoofer signal LFE are respectively main
speakers SP-BL, SP-BR, rear speakers SP-RL, SP-RR, center speakers SP-C, subwoofer SP-SW It is
supplied (step S12). Second Embodiment FIG. 4 is a block diagram showing a configuration of a
sound reproducing apparatus according to a second embodiment of the present invention. The
same reference numerals are given to the same components as FIG. Yes. In this embodiment, an
apparatus for performing 6.1 channel sound reproduction will be described. The DSP 3 b
generates analog audio signals of main signals L and R, rear signals RL and RR, center signal C,
subwoofer signal LFE, and rear center signal RC (rear center) from the input digital audio signal
DIN. When the DSP 3 b is set to off (or downmix), the main signals L and R are output, and when
the DSP 3 b is set to on, the main signals L and R, rear signals RL and RR, The center signal C, the
subwoofer signal LFE, and the rear center signal RC are output. FIG. 5 shows a speaker
arrangement of the first zone ZoneA and the second zone ZoneB in the case of using the sound
reproducing apparatus of FIG. In the present embodiment, the rear center speaker SP-RC is added
to the speaker arrangement in the first zone ZoneA described with reference to FIG. The speaker
output terminal 5-8 is connected to the rear center speaker SP-RC. The operation of the sound
reproduction apparatus in the case of switching the main speakers is substantially the same as
that of the first embodiment, so the operation of the present embodiment will be described with
reference to FIG. In the following description, the main speakers SP-AL and SP-AR of system A
are disposed in the first zone ZoneA, and the main speakers SP-BL and SP-BR of system B are
disposed in the second zone ZoneB, and DSP3b On the assumption that is set to on. When the
main speaker selection button A is pressed and the main speaker selection button B is
not pressed (NO in step S1 in FIG. 2 and YES in step S2), the main speaker selection signal SSELA
is valid. The main speaker selection signal SSELB becomes invalid (step S3), the A system main
speaker switching switch spA is turned on, and the B system main speaker switching switch spB
is turned off (step S4).
The DSP 3 b outputs the main signals L and R, the rear signals RL and RR, the center signal C, the
subwoofer signal LFE, and the rear center signal RC (step S 5). The processing of the main signals
L and R, the rear signals RL and RR, the center signal C, and the subwoofer signal LFE output
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from the DSP 3 b is the same as in the first embodiment. The rear center signal RC output from
the DSP 3 b is amplified by the power amplifier 4-6 and output from the speaker output terminal
5-8. Thus, 6.1 channel sound reproduction is performed in the first zone ZoneA. On the other
hand, when "B" of the main speaker selection button is pressed and "A" of the main speaker
selection button is not pressed (YES in step S1, NO in step S6), the main speaker selection signal
SSELA is invalid. The main speaker selection signal SSELB becomes valid (step S7), the A system
main speaker switching switch spA is turned off, and the B system main speaker switching switch
spB is turned on (step S8). When the main speaker selection signal SSELA of system A is invalid,
the main speaker selection signal SSELB of system B is valid, and mode switching signal MSEL is
valid (YES in step S9), DSP 3b receives rear signals RL and RR, and the center signal The output
of the surround signals of C, the subwoofer signal LFE, and the rear center signal RC is stopped
(step S10), and the sound effects are added to the main signals L and R (step S11). The sound
effect addition process at this time includes the time difference and the frequency component
when reaching the user from the rear center speaker SP-RC in addition to the sound effect
addition process of the first embodiment. The signal RC may be processed and supplied to the
main speakers SP-BL and SP-BR. FIG. 6 is a view showing an example of the sound effect addition
process of the DSP 3 b with respect to the main signals L and R, and the same processes as those
in FIG. 3 are denoted by the same reference numerals. Since the rear center signal RC may be
localized between the rear signals RL and RR, it may be distributed to the rear signals RL and RR
before filtering. That is, the rear center signal RC is divided by the adder circuit 312 and added to
the rear signals RL and RR before the filtering process. The processing of the rear signals RL and
RR, the center signal C, and the subwoofer signal LFE is the same as in the first embodiment. The
DSP 3 b outputs the main signals L and R to which the sound effects are added as described
above.
In this way, it is possible to reproduce the realism of multi-channel sound reproduction with the
two-channel main speakers SP-BL and SP-BR in the second zone ZoneB. In the above description,
although the case of using either the main speaker of system A or system B has been described,
the main speakers of system A and system B are simultaneously used as in the first embodiment.
It is also possible. Third Embodiment FIG. 7 is a block diagram showing a configuration of a
sound reproducing apparatus according to a third embodiment of the present invention, and the
same reference numerals are given to the same components as FIG. Yes. In the present
embodiment, an apparatus for performing 8.1 channel sound reproduction will be described. The
DSP 3c is composed of main digital signals L and R, rear signals RL and RR, center signals C,
subwoofer signals LFE, rear center signals RC, front signals FL (front left) and FR (front right)
from the input digital audio signal DIN. Generate each analog audio signal. When the DSP 3 c is
set to off (or downmix), the main signals L and R are output, and when the DSP 3 c is set to on,
the main signals L and R and the rear signal RL are output. , RR, center signal C, subwoofer signal
LFE, rear center signal RC, and front signals FL, FR. FIG. 8 shows the speaker arrangement of the
first zone ZoneA and the second zone ZoneB in the case of using the sound reproducing
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apparatus of FIG. In the present embodiment, the front speakers SP-FL and SP-FR are added to
the speaker arrangement of the first zone ZoneA of the second embodiment described in FIG. The
speaker output terminals 5-9 and 5-10 are connected to the front speakers SP-FL and SP-FR,
respectively. At this time, since the main speakers of two systems of A and B are arranged in
different zones, respectively, the mode switching signal MSEL is enabled. Since the operation of
the sound reproduction apparatus in the case of switching the main speaker is substantially the
same as that of the first embodiment, the operation of the present embodiment will be described
with reference to FIG. In the following description, the main speakers SP-AL and SP-AR of system
A are arranged in the first zone ZoneA, and the main speakers SP-BL and SP-BR of system B are
arranged in the second zone ZoneB, and DSP3c On the assumption that is set to on. When the
main speaker selection button A is pressed and the main speaker selection button B is
not pressed (NO in step S 1 in FIG. 2, YES in step S 2), the main speaker selection signal SSELA is
valid. The main speaker selection signal SSELB becomes invalid (step S3), the A system main
speaker switching switch spA is turned on, and the B system main speaker switching switch spB
is turned off (step S4).
The DSP 3c outputs main signals L and R, rear signals RL and RR, a center signal C, a subwoofer
signal LFE, a rear center signal RC, and front signals FL and FR (step S5). The processing of the
main signals L and R, the rear signals RL and RR, the center signal C, the subwoofer signal LFE,
and the rear center signal RC output from the DSP 3c is the same as that of the second
embodiment. The front signals FL and FR output from the DSP 3c are amplified by the power
amplifiers 4-7 and 4-8, respectively, and output from the speaker output terminals 5-9 and 5-10.
Thus, 8.1 channel sound reproduction is performed in the first zone ZoneA. On the other hand,
when "B" of the main speaker selection button is pressed and "A" of the main speaker selection
button is not pressed (YES in step S1, NO in step S6), the main speaker selection signal SSELA is
invalid. The main speaker selection signal SSELB becomes valid (step S7), the A system main
speaker switching switch spA is turned off, and the B system main speaker switching switch spB
is turned on (step S8). When the main speaker selection signal SSELA of system A is invalid, the
main speaker selection signal SSELB of system B is valid, and mode switching signal MSEL is
valid (YES in step S9), DSP 3c generates rear signals RL and RR, and a center signal The output of
the surround signals C, the subwoofer signal LFE, the rear center signal RC, and the front signals
FL and FR is stopped (step S10), and the sound effects are added to the main signals L and R
(step S11). In the sound effect addition process at this time, the front signals FL and FR may be
added to the main signals L and R, respectively, in addition to the sound effect addition process
of the second embodiment. FIG. 9 is a diagram showing an example of the sound effect addition
process of the DSP 3 c with respect to the main signals L and R, and the same processes as those
of FIG. 6 are denoted by the same reference numerals. The processing of the rear signals RL and
RR, the center signal C, the subwoofer signal LFE, and the rear center signal RC is the same as in
the second embodiment. The front signal FL is added to the main signal L by the addition circuit
314, and the front signal FR is added to the main signal R by the addition circuit 315. The DSP 3c
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outputs the main signals L and R to which the sound effects are added as described above. In this
way, it is possible to reproduce the realism of multi-channel sound reproduction with the twochannel main speakers SP-BL and SP-BR in the second zone ZoneB.
In the above description, although the case of using one of the main speakers of system A or
system B has been described, as in the first embodiment, the main speakers of system A and
system B are simultaneously used. It is also possible. According to the present invention, by
providing the mode setting means in the sound reproducing apparatus, the speaker connected to
the first speaker output terminal and the speaker connected to the second speaker output
terminal are provided. In the first zone, and the speaker connected to the first speaker output
terminal is arranged in the first zone and the speaker connected to the second speaker output
terminal is It is possible to set the usage method of one of the two modes of the second mode to
be used by arranging in the zone of 5, so that it is optimal according to the usage of the speaker
connected to the second speaker output terminal. Sound reproduction can be realized. Then,
when the output to the first speaker output terminal is off, the output to the second speaker
output terminal is on, and the second mode is selected, the DSP stops outputting the surround
signal. Thus, unnecessary surround signals can be prevented from being reproduced in the first
zone. When the output to the first speaker output terminal is off, the output to the second
speaker output terminal is on, and the second mode is selected, the DSP has an effect on the
main signal. The addition of sound makes it possible to realize a so-called virtual speaker that
localizes the sound image of the rear signal to the rear of the listener, and can reproduce the
realism of multi-channel sound reproduction with the two-channel main speaker . BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of a sound
reproducing apparatus according to a first embodiment of the present invention. FIG. 2 is a
flowchart showing the operation of the sound reproducing apparatus when switching the main
speaker in the first embodiment of the present invention. FIG. 3 is a view showing an example of
sound effect addition processing of the DSP according to the first embodiment of the present
invention; FIG. 4 is a block diagram showing a configuration of a sound reproducing apparatus
according to a second embodiment of the present invention. FIG. 5 is a plan view showing a
speaker arrangement of a first zone and a second zone according to a second embodiment of the
present invention. FIG. 6 is a view showing an example of a sound effect addition process of the
DSP according to the second embodiment of the present invention. FIG. 7 is a block diagram
showing a configuration of a sound reproducing apparatus according to a third embodiment of
the present invention.
FIG. 8 is a plan view showing a speaker arrangement of a first zone and a second zone according
to a third embodiment of the present invention. FIG. 9 is a view showing an example of a sound
effect addition process of the DSP according to the third embodiment of the present invention.
FIG. 10 is a block diagram showing a configuration of a conventional sound reproduction
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apparatus. 11 is a plan view showing a speaker arrangement of a first zone performing multichannel sound reproduction and a second zone performing two-channel sound reproduction. FIG.
[Description of the code] 1 input terminal 2 A / D converter 3a, 3b, 3c DSP 4 power amplifier 5
speaker output terminal 6 main speaker changeover switch 7 subwoofer output terminal 8:
Control unit.
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