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JPH09271100

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DESCRIPTION JPH09271100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio signal processing apparatus used for sound field reproduction, surround reproduction and
the like.
[0002]
2. Description of the Related Art A DSP (Digital Signal Processor) for signal processing is
incorporated as an acoustic signal processing apparatus used for sound field reproduction,
surround reproduction, etc., and acoustic signal processing is carried out for sound field
reproduction, surround reproduction, Devices that output data are known under the names of an
AV amplifier, a surround processor, and the like. The AV amplifier is configured to be able to
select multi-channel surround reproduction and left and right two-channel reproduction. Multichannel surround reproduction is often used to enhance the reproduction effect, such as to
increase the sense of reality when performing sound reproduction accompanied by video such as
a movie or a concert.
[0003]
[Problems to be Solved by the Invention] When performing 2-channel reproduction such as 2channel stereo audio reproduction with an AV amplifier, usually, only 2 channels on the front left
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1
and right among multiple channels prepared for surround are output Was playing. For this
reason, in the case of surround reproduction, the processing capability of the DSP and the output
channel are sufficiently utilized. However, in the case of two-channel reproduction, the
reproduction is performed despite the processing capability of the DSP and the output channel.
Output performance was limited. The object of the present invention is to improve the
reproduction performance by allocating the processing capacity of the DSP and the output
channel, which become extra when reproducing two channels, for the connection of the balanced
circuit with the speaker.
[0004]
An acoustic signal processing apparatus according to the present invention comprises a digital
signal processing unit having outputs of at least four channels, and a D / A converting each
output signal from the digital signal processing unit into an analog signal. A conversion unit, an
amplification unit for amplifying each output signal from the D / A conversion unit, and two
channels of the output of the digital signal processing unit when a two-channel reproduction
instruction is input when connected to the digital signal processing unit. A control unit that
outputs positive phase signals of two-channel regeneration from each other, outputs reversephase signals of two-channel regeneration from other two channels of the output of the digital
signal processing unit, and switches the speaker output circuit of the amplifier unit to a balanced
circuit The The audio signal processing apparatus according to the present invention further
comprises a video signal input unit connected to the control unit, wherein the control unit
determines the presence or absence of the video signal input and determines that the input is not
present. Out of the outputs, the normal phase signal of each two channel reproduction is output
from two channels, and the opposite phase signal of each two channel reproduction is output
from the other two channels of the output of the digital signal processing unit It is to switch to
the circuit. The output signal of the signal processing unit can be switched between the case of
surround reproduction and the case of two-channel reproduction, and a circuit configuration
suitable for each can be made. Further, according to the present invention, two-channel
reproduction can be automatically set when there is no video signal requiring surround
reproduction.
[0005]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of an acoustic
signal processing apparatus according to the present invention. First, with reference to FIG. 1A,
the case of performing surround reproduction of front two channels (right and left) and rear two
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channels (right and left) will be described. Digital audio data input from the input terminal 1 is
input to a signal processing DSP (Digital Signal Processor) 2 and subjected to surround signal
processing.
[0006]
The signal on the front left side output from the output end O1 of the DSP 2 is converted to an
analog signal by the D / A converter 3, amplified by the power amplifier 7, and output from the
output end 15 to the speaker disposed on the front left of the listener Be done. The rear left
signal output from the output end O2 of the DSP 2 is converted to an analog signal by the D / A
converter 4, amplified by the power amplifier 8, and output from the output end 17 to the
speaker disposed on the rear left of the listener Be done.
[0007]
The signal on the front right side output from the output end O3 of the DSP 2 is converted to an
analog signal by the D / A converter 5, amplified by the power amplifier 9, and output from the
output end 16 to the speaker disposed on the front right side of the listener Be done. The right
rear signal output from the output end O4 of the DSP 2 is converted to an analog signal by the D
/ A converter 6, amplified by the power amplifier 10, and output from the output end 18 to the
speaker disposed on the rear right of the listener Be done.
[0008]
A switch 13 is provided between the power amplifier 8 and the output terminal 17, a switch 14
is provided between the power amplifier 10 and the output terminal 18, and they are both
connected (ON) when performing surround reproduction. The output of the power amplifier 8 is
also connected to the negative side of the output terminal 15 via the switch 11. When
performing surround reproduction, the switch 11 is switched to the B side, and the negative side
of the output terminal 15 is grounded. The output of the power amplifier 10 is also connected to
the-side of the output end 16 via the switch 12. When performing surround reproduction, the
switch 12 is switched to the B side, and the-side of the output end 18 is grounded. The switch 11
and the switch 13, and the switch 12 and the switch 14 interlock with each other.
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[0009]
The signal processing DSP 2 is connected to a control unit 20 configured of a microcomputer
and its internal program. A signal for setting whether to perform surround reproduction or twochannel reproduction is configured to be input from the control unit 20 to the signal processing
DSP 2. The signal processing DSP 2 is configured to be able to input a signal indicating whether
the setting of the signal processing DSP 2 is for surround reproduction or two-channel
reproduction to the control unit 20.
[0010]
The control unit 20 is set as a circuit for surround reproduction or 2-channel reproduction by
switching the setting of the signal processing DSP 2 and the switches 11 to 14 in accordance
with an instruction signal input from an operation input unit or DSP 2 (not shown). Do. The
control unit 20 determines whether the setting of the DSP 2 for signal processing is for surround
reproduction or for two-channel reproduction, and switches the switches 11 to 14 in accordance
with the determined setting to obtain surround reproduction or two-channel. Set to the circuit for
playback. The control unit 20 determines whether the setting of the signal processing DSP 2 is
for surround reproduction or for two-channel reproduction, and compared with the operation
when the switches 11 to 14 are switched last time, Monitor whether the switching status is
correct.
[0011]
Next, with reference to FIG. 1B, the case of performing front two channel reproduction will be
described. The digital audio data input from the input terminal 1 is subjected to signal processing
for 2-channel reproduction by the signal processing DSP 2, and the left-handed positive-phase
signal from the output end O 1 of the signal processing DSP 2 to the D / A converter 3 Of the
signal processing DSP 2 from the output end O 2 to the D / A converter 4, the signal processing
DSP 2 from the output end O 3 to the D / A converter 5 from the output terminal O 3 of the
signal processing DSP 2, The opposite-phase signal on the right side is input to the D / A
converter 6 from the output end O4. The analog signals D / A converted by the D / A converters
7 to 10 are respectively input to the power amplifiers 7 to 10 and amplified.
[0012]
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At this time, the switch 11 is switched to the A side, the switch 13 is switched to the OFF state,
and the output of the power amplifier 8 is connected to the − side of the output terminal 15.
The switch 12 is switched to the A side, the switch 14 is switched to the OFF, and the output of
the power amplifier 10 is connected to the − side of the output terminal 16. Therefore, the
positive phase signal on the front left side is input from the power amplifier 7 to the positive side
of the output terminal 15, and the negative phase signal on the front left side is input from the
power amplifier 8 to the negative side of the output terminal 15. Further, a positive front signal
on the right side is input from the power amplifier 9 to the positive side of the output terminal
17, and a negative phase signal on the front right is input from the power amplifier 10 to the
negative side of the output terminal 17. Further, the switches 13 and 14 are turned off at the
output ends 19 and 20 to the rear left and right speakers, and no signal is output. As described
above, the front left and right speakers are respectively balanced and connected as BTL
(Balanced Transformer Less) connections and reproduced and output.
[0013]
A video signal is input to the control unit 20 from the input terminal 21. A video signal from the
input terminal 21 is connected to a video display unit via a video signal processing unit (not
shown) and configured to perform video output. The control unit 21 detects the presence or
absence of the video signal, and switches the signal processing DSP 2 and the switches 11 to 14
to a circuit for 2-channel reproduction when it determines that the video signal is not input. The
control unit 21 detects the presence or absence of the video signal, and switches the signal
processing DSP 2 and the switches 11 to 14 to the circuit for surround reproduction when
determining that the video signal is present.
[0014]
Surround playback of sound is often used to enhance the effect when performing video playback
of a movie or the like, and 2-channel playback is commonly used when stereo playback of an
audio signal from the front left and right, so control in this way By automatically switching and
setting by the unit 20, operability can be simplified. When two-channel reproduction is desired
when there is a video signal, or when surround reproduction is desired when there is no video
signal, the switching operation may be performed by an input operation from an operation unit
(not shown) to the control unit. Also, the automatic switching operation may be canceled.
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[0015]
FIG. 2 shows a flow chart of one embodiment of the switching operation by the acoustic signal
processing device of the present invention. This processing operation is performed by the control
unit 20 in the present embodiment. When it is started (S1), it is determined whether or not the
switching operation between surround reproduction of acoustic signals and 2-channel
reproduction is set to automatic (S2), and if it is set to automatic setting (YES at S2), automatic
setting is performed. Decide to do, go to S3. If the automatic setting is not set (NO in S2), the
automatic setting operation is ended (S8), and manual switching is awaited.
[0016]
It is determined whether there is an audio signal input from the input terminal 1 (S3), and if
there is an audio signal input (YES in S3), then it is determined whether there is an input video
signal from the input terminal 21 (S4) . If there is an input of the video signal (YES in S4), the
control unit 20 switches the signal processing DSP 2 and the switches 11 to 14 to the surround
reproduction circuit (S5). If there is no video signal input (NO in S4), the control unit 20 switches
the circuit for signal processing DSP 2 and switches 11 to 14 to 2-channel reproduction (S6).
When the circuit is set in S5 or S6, reproduction output is performed (S7), and the automatic
setting operation is completed (S8).
[0017]
According to this embodiment, in the case of two-channel reproduction, the signal processing
unit performs signal processing output for BTL, and switches the output circuit to the speaker to
the BTL configuration, as an output characteristic in the case of two-channel reproduction.
Signal-to-noise ratio, distortion factor, and output level can be improved. The improvement effect
of each of the left and right channels is theoretically that the SN ratio is 3 dB and the output level
is 4 times. According to this embodiment, it is possible to selectively reproduce two-channel
reproduction of surround reproduction and BTL circuit configuration by changing the signal size
without changing the circuit size and leaving the connection terminal of the speaker as it is.
[0018]
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As described above, according to the present invention, the output signal can be switched
between the case of surround reproduction and the case of two-channel reproduction, and a
circuit configuration suitable for each can be obtained. Further, according to the present
invention, when there is no video signal requiring surround reproduction, it is possible to
automatically set 2 channel reproduction and perform reproduction with improved output
characteristics.
[0019]
Brief description of the drawings
[0020]
1 is a block diagram showing an embodiment of the acoustic signal processing apparatus
according to the present invention.
[0021]
2 is a flow chart showing an embodiment of the setting operation of the acoustic signal
processing apparatus according to the present invention.
[0022]
Explanation of sign
[0023]
1, 21 input terminal 2 DSP for signal processing 3, 4, 5, 6 D / A converter (D / A) 7, 8 9, 10
Power amplifier (PA) 11, 12, 13, 14 switch 15, 16, switch 17, 18 output end
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