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DESCRIPTION JP2005005933

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DESCRIPTION JP2005005933
An audio processing apparatus capable of effectively preventing a signal that causes noise noise
output from being supplied to an audio processing unit. When the operation buttons
corresponding to the audio processing units 22_1 to 22_m and the combining unit 23 in which
boards BD1 to BDm and BDs are not attached to interfaces IF1 to IFs are operated, a monitor unit
24 receives input L audio Mismatch of the LSB value between the signal and the R audio signal is
detected, and audio processing of the input audio signal is automatically stopped. This prevents
the inappropriate audio signal S24 from being output to the monitor speaker 30. [Selected
figure] Figure 2
Audio processing device
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio processing apparatus for monitoring an audio signal. [0002] For example, there is an audio
processing apparatus such as an audio control console which performs various audio processing
such as amplification and synthesis on an input audio signal to generate an audio signal for
broadcasting. Such an audio processing apparatus inputs a plurality of audio processing units
that individually perform the various audio processing described above, and an audio signal from
the audio processing unit selected by the operation of the operator among the audio processing
units, It has monitor processing which carries out monitor processing and outputs it to a monitor
speaker. Each of the above-described audio processing units is realized, for example, as a board,
and is incorporated into the audio processing apparatus by mounting the board in a slot provided
in the audio processing apparatus. The monitor unit is connected to the slot via, for example, a
switching unit such as a parallel bus. Then, in accordance with the operation of the operator, the
switching unit connects the slot in which the board for realizing the audio processing unit is
mounted and the monitor unit. [0003] However, in the related art, for example, even when the
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board of the audio processing unit selected by the operation of the operator is not attached to
the slot, the slot and the monitor unit by the switching unit. And will be connected. Therefore,
there is a problem that an appropriate audio signal is not input to the monitor unit and a loud
noise is output from the monitor speaker. The present invention has been made in view of such
circumstances, and an object thereof is to provide an audio processing device capable of
effectively avoiding a signal that causes noise noise output being supplied to an audio processing
unit. It is. In order to achieve the above object, an audio processing apparatus according to the
present invention comprises a first audio signal of a right channel and an audio signal of a left
channel, the first audio signal comprising: N (n is an integer greater than or equal to 2) first audio
processing means stages each outputting an audio signal and a second audio signal having a
different value of a predetermined bit in a predetermined cycle, and the n above Connecting
means for connecting the first audio processing means selected from the first audio processing
means and the second audio processing means, and the first audio processing means connected
via the connection means The predetermined bits of the first audio signal and the second audio
signal input from the audio signal processing means are compared, and the predetermined bits
have mutually different values. Preparative to the conditions, and a second audio processing
means for processing the first audio signal and the second audio signal the input.
The operation of the audio processing device of the present invention is as follows. The
connection means connects the first audio processing means selected from the n first audio
processing means and the second audio processing means. When the first audio processing
means is in the connected state, the first audio processing means to the second audio processing
means via the connection means, the first audio signal of the right channel, and the left one. The
audio signal of the channel, which is the first audio signal and the second audio signal having a
predetermined bit value different from each other, is outputted at a predetermined cycle. Then,
the second audio processing means compares the predetermined bits of the input first audio
signal and the input second audio signal, and since the predetermined bits have mutually
different values, the input is performed. It processes the first audio signal and the second audio
signal. On the other hand, when the first audio processing means is in the non-connected state,
the second audio processing means does not receive the first audio signal and the second audio
signal described above, and the predetermined one of the input signals is not input. As a result of
comparing the bits of (1), the predetermined bits have the same value, and the processing of the
input signal is not performed. In the audio processing device of the present invention, preferably,
the first audio processing means has an n-fold frequency of the first reference signal within a
first period defined by the first reference signal. The first audio signal and the second audio
signal are output once each in the second cycle which is previously assigned among the plurality
of second cycles defined by the second reference signal. In the audio processing device of the
present invention, preferably, the second audio processing means performs monitor processing
of the input first audio signal and the input second audio signal. In the audio processing device of
the present invention, preferably, the second audio processing means is the first audio signal and
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the second audio signal inputted from the audio signal processing means via the connection
means. The predetermined bits are based on the comparison result of the comparison unit that
compares the predetermined bits of the audio signal, the audio processing unit that processes the
first audio signal and the second audio signal, and the comparison result of the comparison unit.
And a switching unit that supplies the input first audio signal and the second audio signal to the
processing of the audio processing unit when they have mutually different values.
In the audio processing device of the present invention, preferably, the audio processing unit
outputs an audio signal generated by processing the first audio signal and the second audio
signal to a speaker. BEST MODE FOR CARRYING OUT THE INVENTION An audio processing
apparatus according to an embodiment of the present invention will be described below. FIG. 1 is
a block diagram of an audio processing apparatus 1 according to an embodiment of the present
invention. As shown in FIG. 1, the audio processing device 1 includes, for example, a connection
unit 21, audio processing units 22 _ 1 to 22 _m, a synthesis unit 23, a monitor unit 24, and an
operation unit 25. Here, the audio processing device 1 corresponds to the audio processing
device of the present invention, the connection unit 21 corresponds to the connection means of
the present invention, and the audio processing units 22_1 to 22_m and the synthesizing unit 23
correspond to the first audio processing of the present invention. The monitor unit 24
corresponds to the second audio processing means of the present invention. The audio
processing apparatus 1 has a feature in the monitor unit 24 and whether or not a board for
realizing the audio processing units 22_1 to 22_m and the combining unit 23 selected by the
operation unit 25 is appropriately mounted on the audio processing apparatus 1 Is automatically
detected by the monitor unit 24, and monitoring processing of these audio signals is performed
on the condition that the board is attached. The connection unit 21 includes audio signals S10_1
to S10_s input from the playback / input devices 10_1 to 10_s, audio signals S22_1 to S22_m
input from the audio processing units 22_1 to 22_m, and a combined signal S20 input from the
combining unit 23. And one or more of them are selected based on the operation signal S25 from
the operation unit 25 and output to one of the audio processing units 22_1 to 22 ̶ m and the
monitor unit 24. Here, s and m are any integers of 1 or more. The reproduction / input devices
10_1 to 10_s each have an audio signal for the left channel (hereinafter also referred to as an L
audio signal) whose LSB indicates a logical value “1” (first logical value) as each of the audio
signals S10_1 to S10_s. , And generates an audio signal for the right channel (hereinafter also
referred to as an R audio signal), the LSB of which indicates a logic value “0” (second logic
value), and outputs these to the connection unit 21. The connection unit 21 is realized, for
example, using a parallel bus 50 as shown in FIG. The audio processing units 22_1 to 22_m, for
example, perform audio processing such as level adjustment (amplification processing) on the
audio signals S21_1 to S21_m input from the connection unit 21 to generate audio signals
S22_1 to S22_m, respectively. It is output to the connection unit 21 and the combining unit 23.
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Here, as shown in FIG. 3D, as the audio signals S21_1 to S21_m, the audio processing units 22_1
to 22_m each have an L audio signal (1-L for the left channel in which the LSB indicates a logical
value “1”. ) To (m−L) and R audio signals (1-R) to (m−R) for the right channel in which the
LSB indicates the logical pair “0”. L audio signals (1-L) to (m-L) correspond to the first audio
signal of the present invention, and R audio signals (1-R) to (m-R) are the second audio signal of
the present invention It corresponds to The combining unit 23 combines the input audio signals
S22_1 to S22_m to generate a combined signal S20. The combining unit 23 supplies the
combined signal S20 to the broadcast output and outputs the combined signal S20 to the
connection unit 21. Here, the combining unit 23 sets, as the combined signal S20, an L audio
signal (s−L) for the left channel whose LSB indicates the logical value “1” and an R audio
signal for the right channel where the LSB indicates the logical value “0”. Generate an audio
signal (s-R). In the present embodiment, as shown in FIG. 2, the audio processing apparatus 1 has
interfaces IF1 to IFm, IFs, IFt for mounting on boards, and boards BD1 to BDm, BDs, By mounting
the BDt, the functions of the audio processing units 22_1 to 22_m, the synthesis unit 23, and the
monitor unit 24 are incorporated. The connection unit 21 includes interfaces IF1 to IFm and IFs
on which the audio processing units 22_1 to 22_m selected based on the operation signal S25
and the boards BD1 to BDm and BDs of the synthesis unit 23 are mounted, and the interface IFt
of the monitor unit 24. , Connection via parallel bus 50. On the other hand, the connection unit
21 does not select based on the operation signal S 25, and interfaces IF 1 to IFm and IFs on
which the boards BD 1 to BDm and BDs of the audio processing units 22 _ 1 to 22 ̶ m and the
synthesis unit 23 are mounted And are disconnected via the parallel bus 50. Further, as shown in
FIG. 2, the audio processing device 1 has a clock generation unit 49, and generates the clock
signal LRCLK shown in FIG. 3 (B) generated by the clock generation unit 49. The reference signal
is output to each component, and the clock signal PARCLK (first reference signal of the present
invention) shown in FIG. 3A is output to the connection portion 21.
In the present embodiment, the clock signal LRCLK has, for example, a frequency n (n = m + 1)
times that of the clock signal PARCLK. The frequency of the clock signal PARCLK is, for example,
48 kHz, and in general, the clock signal LRCLK has a frequency corresponding to that of 2S (S is
an integer of 1 or more). As shown in FIG. 3C, each of audio processing units 22 _ 1 to 22 _m
and combining unit 23 has a first period T 1 (first period of the present invention) defined by
clock signal PARCLK. The L audio signals (1-L) to (m) are generated in the second cycle T2
assigned in advance among the plurality of second cycles T2 (the second cycle of the present
invention) defined by the clock signal LRCLK. -L), (s-L) and R audio signals (1-R) to (m-R), (s-R)
are output to the parallel bus 50 of the connection unit 21 once each. The monitor unit 24
compares a predetermined bit (for example, LSB) of an L audio signal and an R audio signal that
constitute an audio signal input from the audio processing units 22_1 to 22_m and the
combining unit 23 via the connection unit 21. And monitoring the input audio signal on
condition that the predetermined bits have different values. FIG. 4 is a block diagram of the
monitor unit 24. As shown in FIG. Note that FIG. 4 illustrates the case where the monitor unit 24
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receives the audio signal S22_1 (L audio signal (1-L), R audio signal (1-R)) from the audio
processing unit 22_1. As shown in FIG. 4, the monitor unit 24 includes, for example, a
comparison unit 71, switches 72 and 73, an L channel signal processing unit 74, and an R
channel signal processing unit 75. Here, the comparison unit 71 corresponds to the comparison
unit of the present invention, the switches 72 and 73 correspond to the switching unit of the
present invention, and the L channel signal processing unit 74 and the R channel signal
processing unit 75 correspond to the audio processing unit of the present invention. It
corresponds to The comparison unit 71 generates L audio signals (1-L) to (m-L) and (s-L) which
constitute the input audio signal every second period T2 based on the clock signal LRCLK. And
the R audio signals (1-R) to (m-R) and (s-R), and when the LSBs have different values, the switch
signals S71L and S71R indicating the connection state are respectively switched. Output to 72,
73. In the present embodiment, when the boards BD1 to BDm and BDs shown in FIG. 2 are
attached to the interfaces IF1 to IFm and IFs, L audio signals (1-L) to (mL), (s) which are
respectively input are input. The LSB of -L) indicates a logic "1", and the LSBs of the input R audio
signals (1-R) to (m-R) and (s-R) indicate a logic "0".
Therefore, the comparison unit 71 outputs switching signals S71L and S71R indicating the
connection state to the switches 72 and 73, respectively. On the other hand, when the LSB has
the same value, the comparison unit 71 outputs switching signals S71L and S71R indicating the
disconnection state to the switches 72 and 73, respectively. In this embodiment, when the boards
BD1 to BDm and BDs shown in FIG. 2 are not attached to the interfaces IF1 to IFm and IFs, L
audio signals (1-L) to (m−L), (s) input are respectively input. The LSB of -L) indicates the logic
value and the R audio signal (1-R) to (m-R) and (s-R) that are input indicate the same logic value.
Therefore, the comparison unit 71 outputs switching signals S71L and S71R indicating the
disconnection state to the switches 72 and 73, respectively. The switch 72 sends the input L
audio signals (1-L) to (m−L) and (s−L) to the L channel signal processing unit 74 on condition
that the switching signal S71L indicates the connection state. Output. The switch 73 outputs the
input R audio signals (1-R) to (m-R) and (s-R) to the R-channel signal processing unit 75 on
condition that the switching signal S71R indicates the connection state. The L channel signal
processing unit 74 performs audio processing on the L audio signals (1-L) to (mL) and (sL) input
through the switch 72 to generate an L audio signal S24L. And outputs this to the monitor
speaker 30. The R channel signal processing unit 75 performs audio processing on the R audio
signals (1-R) to (m-R) and (s-R) input through the switch 73 to generate an R audio signal S24R.
Is output to the monitor speaker 30. Here, the monitor signal S24 is configured by the L audio
signal S24L and the R audio signal S24R. As shown in FIG. 4, the audio processing unit 22_1 has,
for example, an L channel signal processing unit 61, an R channel signal processing unit 62, an
output unit 63, and an output unit 64. The audio processing units 22_2 to 22_m basically have
the same configuration as the audio processing unit 22_1. The L channel signal processing unit
61 performs audio processing on the L audio signal S21_1L of the audio signal S21_1 input from
the connection unit 21 to generate an L audio signal (1-L), and outputs this to the output unit 63.
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The R channel signal processing unit 62 performs audio processing on the R audio signal S21_1R
of the audio signal S21_1 input from the connection unit 21 to generate an R audio signal (1-R),
and outputs this to the output unit 64.
As shown in FIG. 3C based on the clock signal LRCLK, the output unit 63 outputs the audio signal
(1-L) to the parallel bus of the connection unit 21 within the second cycle T2 assigned in
advance. Output to 50. Based on the clock signal LRCLK, the output unit 64 outputs the audio
signal (1-R) to the parallel bus 50 of the connection unit 21 within the second cycle T2 assigned
in advance, as shown in FIG. 3C. Do. The operation unit 25 is, for example, an operation panel or
the like, and outputs an operation signal S25 according to the operation of the operation panel
by the user to the connection unit 21, the audio processing units 22_1 to 22_m, the combining
unit 23, and the monitor unit 24. , Control these. For example, when the number of audio
processing units 22_1 to 22_m is 15, that is, m = 15, the operation unit 25 corresponds to each
of the audio processing units 22_1 to 22_m and the combining unit 23 as shown in FIG. The
operation buttons B1 to B15 and B23 are provided. The operation unit 25 outputs, to the
connection unit 21, an operation signal S25 indicating that the audio processing units 22_1 to
22_m and the combining unit 23 corresponding to the operation buttons B1 to B15 and B23
operated by the user are selected. Hereinafter, an operation example of the above-described
audio processing device 1 will be described. FIG. 6 is a flowchart for explaining an operation
example of the above-described audio processing device 1. First Operation Example In this
operation example, as shown in FIG. 4, the board BD1 is attached to the interface IF1, and the
audio signals (1-L) and (1-R) from the audio processing unit 22_1 are connected to each other. A
case where the image data is selected at 21 and input to the monitor unit 24 will be described.
Step ST1: The connection unit 21 brings the interface IF1 and the monitor unit 24 into a
connected state via the parallel bus 50 by the operation of the operation button B1 shown in FIG.
5 by the user. Step ST2: The audio processing unit 22_1 generates an L audio signal (1-L) and an
R audio signal (1-R) that constitute the audio signal S22_1, and outputs this to the connection
unit 21. As a result, the L audio signal (1-L) and the R audio signal (1-R) are output to the
monitor unit 24 via the parallel bus 50 of the connection unit 21. Step ST3: The comparison unit
71 of the monitor unit 24 compares the LSB of the input L audio signal (1-L) with the R audio
signal (1-R) based on the clock signal LRCLK.
Then, when the LSB indicates different values, the comparison unit 71 outputs switching signals
S71L and S71R indicating the connection state to the switches 72 and 73, respectively, and
proceeds to the process of step ST4. On the other hand, when the LSB indicates the same value,
the comparison unit 71 outputs the switching signals S71L and S71R indicating the
disconnection state to the switches 72 and 73, respectively, and proceeds to the process of step
ST5. In this operation example, since the board BD1 is attached to the interface IF1, the LSBs of
the L audio signal (1-L) and the R audio signal (1-R) indicate different values, and the comparison
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unit 71 is in the connection state. The switch signals S71L and S71R indicating L are output to
the switches 72 and 73, respectively, and the process proceeds to step ST4. Step ST4: The L
channel signal processing unit 74 performs audio processing on the L audio signal (1-L) input
through the switch 72 to generate an L audio signal S24L, and outputs this to the monitor
speaker 30. Do. The R channel signal processing unit 75 performs audio processing on the R
audio signal (1-R) input through the switch 73 to generate an R audio signal S24R, and outputs
the R audio signal S24R to the monitor speaker 30. Second Operation Example In this operation
example, as shown in FIG. 4, the interface IF1 is operated by operating the operation button B1
shown in FIG. 5 in a state where the board BD1 is not attached to the interface IF1. The case
where the monitor unit 24 and the monitor unit 24 are connected via the parallel bus 50 will be
described. In this case, following the process of step ST1, the process of step ST3 is performed
without performing the process of step ST2. In step ST3, the comparison unit 71 of the monitor
unit 24 indicates that the LSBs of the input L audio signal (1-L) and the R audio signal (1-R) have
the same value on the basis of the clock signal LRCLK. And outputs switching signals S71L and
S71R indicating the non-connected state to the switches 72 and 73, respectively. As a result, the
switches 72 and 73 are disconnected, and the L channel signal processing unit 74 and the R
channel signal processing unit 75 of the monitor unit 24 receive the L audio signal (1-L) and the
R audio signal (1-R). Are not supplied, and the audio signals S24L and S24R corresponding to
these are not output to the monitor speaker 30 (step ST4). As described above, according to the
audio processing device 1, the operation buttons B1 to B15 and B23 shown in FIG. 5
corresponding to the audio processing units 22_1 to 22_m and the combining unit 23 not
attached to the interfaces IF1 to IFs. Even if the parallel bus 50 is disconnected from the L
channel signal processing unit 74 and the R channel signal processing unit 75 by the comparison
unit 71 and the switches 72 and 73 shown in FIG. .
Therefore, an inappropriate signal is input to the L channel signal processing unit 74 and the R
channel signal processing unit 75, and the L audio signal S24L and the R audio signal S24R
obtained thereby are not output to the monitor speaker 30, Noise noise can be effectively
prevented from being output from the monitor speaker 30. The invention is not limited to the
embodiments described above. For example, all or part of the audio processing units 22_1 to
22_m and the combining unit 23 illustrated in FIG. 1 may be provided with the above-described
comparison unit 71 and switches 72 and 73 illustrated in FIG. According to the present
invention, it is possible to provide an audio processing apparatus capable of effectively avoiding
audio processing of a signal that is a factor of noise sound output and output. BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an audio processing apparatus
according to an embodiment of the present invention. FIG. 2 is a diagram for describing a
configuration in which the audio processing unit shown in FIG. 1 is incorporated into an audio
processing device, and a configuration of a switching unit. FIG. 3 is a diagram showing timings of
respective signals shown in FIG. 2; 4 is a block diagram of an audio processing unit and a
monitor unit shown in FIG. 1; FIG. 5 is a diagram for explaining an operation button which
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constitutes the operation unit shown in FIG. 2; FIG. 6 is a flowchart for explaining an operation
example of the audio processing device shown in FIG. 1; [Description of the code] 1: Audio
processing device, 10_1 to 10_s: playback / input device, 21: connection unit, 22_1 to 22_m:
audio processing unit, 23: combining unit, 24: monitor unit, 25: operation unit, 30: Monitor
speaker 49: clock generation unit 50: parallel bus 61: L channel signal processing unit 62: R
channel signal processing unit 63: output unit 64: output unit 71: comparison unit 72: switch 73
... switch, 74 ... L channel signal processor, 75 ... R channel signal processor
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