JPH08140180

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DESCRIPTION JPH08140180
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
channel divider for dividing an input speech signal into a plurality of channels.
[0002]
2. Description of the Related Art For example, in PA systems of concert halls and other various
acoustic systems, so-called channel dividers are used to output sound effectively. The channel
divider divides the input audio signal into predetermined frequency bands such as bass and
treble, etc. The audio signal of each channel after division is supplied to different speakers and is
output as audio. It is emitted.
[0003]
FIG. 6 is a diagram showing an example of an acoustic system formed using a conventional
channel divider. As shown in FIG. 6, a channel divider 500 is provided for each of the plurality of
audio signal outputs from the audio mixer 1000. In this case, since the configuration from each
of the plurality of channel dividers 500 to the corresponding speaker 900 is the same, the
configuration for one audio output of the mixer 1000 will be described below. In the case of this
example, the channel divider 500 divides the input audio signal into two channels of audio
signals of high sound H and low sound L.
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[0004]
The high-tone and low-tone audio signals after division are supplied to the two-channel power
amplifier 700, and after amplification processing and the like are performed here, the high-tone
audio signals are supplied to speakers dedicated to reproducing high-tone sounds, and bass The
audio signal is supplied to a speaker that reproduces the bass in a dedicated manner. Then, high
and low sounds are emitted from the respective speakers.
[0005]
Further, the channel divider 500 incorporates a speaker protection circuit. That is, channel
divider 500 receives the output audio signal from power amplifier 700 through distributor 800.
Then, when the level of the output audio signal from the power amplifier 700 is excessive, the
channel divider 500 controls to lower the level of the audio signal of the corresponding channel
outputted therefrom.
[0006]
Further, in the conventional acoustic system, the detector 600 is connected between the channel
divider 500 and the power amplifier 700 as an independent unit device in order to detect an
abnormality of the power amplifier 700. That is, the detector 600 is supplied with high-tone and
low-tone audio signals from the channel divider 500 and an output audio signal from the power
amplifier 600 through the distributor 800.
[0007]
Then, the detector 600 compares the audio signal of each channel from the channel divider 500
with the audio signal of the corresponding channel from the power amplifier 700, and the audio
signal is normally supplied from the channel divider 500. Regardless, the case where the level of
the output voice signal from the power amplifier 700 is low is detected as abnormal, and the user
is notified of the power amplifier abnormal.
[0008]
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As described above, when an acoustic system is constructed using the conventional channel
divider 500, the output audio signal from the power amplifier 700 is supplied to the channel
divider 500 and the detector 600. Must.
For this reason, the distributor 800 for distributing the output audio signal of the power
amplifier 700 to the channel divider 500 and the detector 600 is required, and the wiring
becomes complicated.
[0009]
In addition, since a distributor and a detector are required for each output channel of the mixer
1000, the acoustic system becomes large in scale and the cost becomes high.
[0010]
The use of a power amplifier that can compare its input and output and detect abnormalities by
itself can realize simplification of the acoustic system and cost reduction, but selection of a power
amplifier that can be used as a system The degree of freedom of
[0011]
In view of the above, it is an object of the present invention to provide a channel divider capable
of realizing simplification and cost reduction of an acoustic system.
[0012]
SUMMARY OF THE INVENTION In order to solve the above problems, in the channel divider
according to the present invention, when reference numerals of the embodiments to be described
later correspond to each other, a plurality of channels of input audio signals from the first input
terminal 11 are provided. Division means 12 and 22, division of the audio signal of each channel
divided by the division means 12 and 22, level adjustment circuits 13 and 23 on the basis of the
level control signal, and the level adjustment circuit A second input for receiving an output audio
signal from an electronic device provided between the output terminals 15 and 25 of the
adjusted audio signal of each channel, the output terminals 15 and 25 of the audio signal of each
channel, and the speaker The level of the audio signal from the terminals 31 and 41 and the
second input terminals 31 and 41 is detected, and the level control signal according to the level
is formed. Level control signal forming circuits 32 and 42, first monitoring circuits 34 and 44 for
monitoring audio signals of respective channels supplied to the output terminals 15 and 25, and
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audio signals from second input terminals 31 and 41 Receiving the output signals from the
second monitoring circuits 33 and 43 for monitoring the first and second monitoring circuits 34,
44 and 33 and 43, and the circuit system of the audio signal of each channel is normal In spite of
that, determination circuits 35, 45 for determining that the electronic device is abnormal, and
determination result output means 37, 47, 38, 48 for outputting the determination results of the
determination circuits 35, 45 are provided. It is characterized by
[0013]
In the channel divider according to the present invention having the above configuration, the
audio signal from the electronic device such as a power amplifier provided on the output side of
the channel divider is inputted from the second input terminals 31 and 41.
The level of the audio signal passed through the second input terminal is detected by level
control signal forming circuits 32 and 42, and level adjusting circuits 13 and 23 adjust the level
of the audio signal to be output according to the detected level. .
[0014]
Further, the audio signal from the electronic device input from the second input terminals 31 and
44 is also supplied to the second monitoring circuits 33 and 43, and the audio signal from the
electronic device is monitored.
[0015]
Further, the first monitoring circuits 34 and 44 monitor the audio signal from the circuit system
supplied to the output terminals 15 and 25 and output a signal indicating the monitoring result.
[0016]
Based on the monitoring results from the first monitoring circuits 33 and 43 and the monitoring
results from the second monitoring circuits 34 and 44, the determination circuits 35 and 45
determine that the audio signal of the circuit system of each channel is normal. At this time, it is
determined that the audio signal from the electronic device is abnormal, and the determination
result is output.
[0017]
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Since the second audio signal input terminal is conventionally present in a channel divider, if the
channel divider of the present invention is applied to an acoustic system as described above, the
detection circuit and signal distributor of another unit are not necessary. Yes, simplification and
cost reduction of the sound system are realized.
[0018]
An embodiment of a channel divider according to the present invention will be described below
with reference to the drawings.
[0019]
The channel divider in this example is for use in the above-described acoustic system, and
receives the audio signal from the mixer, and has two channels of high and low tones (hereinafter
referred to as a high tone channel and a low tone channel). Divide into audio signals.
[0020]
FIG. 5 is a diagram showing an example of an acoustic system constructed using the channel
divider 100 of this example.
[0021]
As shown in FIG. 5, the channel divider 100 of this example is provided corresponding to the
output audio signal channel of the mixer 400.
The channel divider 100 of this example, the power amplifier 200, and the speaker 300 form an
audio signal reproduction system.
[0022]
The channel divider 100 of this example is formed with a circuit portion for detecting an
abnormality of the power amplifier, as described later. Therefore, an independent unit device as
in the conventional acoustic system described above with reference to FIG. As the detector 600 is
not required.
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Therefore, a signal distributor for distributing the audio signal output from the power amplifier
200 is also unnecessary.
[0023]
One embodiment of a channel divider according to the invention, in which an acoustic system
can be built as in FIG. 5 described above, will now be described in detail.
[0024]
FIG. 1 is a block diagram for explaining the channel divider 100 of this example.
[0025]
In FIG. 1, reference numeral 11 denotes an input terminal for receiving an input of an audio
signal from the mixer 400.
Reference numeral 31 denotes an input terminal for receiving an input of an audio signal of a
high-pitched channel from the power amplifier 200 connected between the channel divider 100
and the speaker 300 in this example.
Similarly, reference numeral 41 denotes an input terminal for receiving the input of the audio
signal of the bass channel from the power amplifier 200.
Further, 15 is an output terminal of the audio signal of the high-pitched channel, and 25 is an
output terminal of the audio signal of the bass channel.
[0026]
The audio signal from the mixer 400 supplied to the input terminal 11 is supplied to the high
pass filter 12 and the low pass filter 22. The high pass filter 12 generates high-pitched sound
with a frequency higher than a predetermined frequency. An audio signal of a channel is
obtained, and from the low pass filter 22, an audio signal of a bass channel whose frequency is
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lower than the predetermined frequency is obtained.
The audio signals of the high tone channel and the low tone channel are supplied to level
adjustment circuits 13 and 23, respectively.
[0027]
These level adjustment circuits 13 and 23 adjust the level of the audio signal of each channel
based on the level control signal from the level control signal formation circuit 32 and 42 and
output it.
[0028]
To the level control signal forming circuits 32 and 42, the audio signals of the high tone channel
and the bass channel from the power amplifier 200 are supplied through the input terminals 31
and 41 respectively, and the high tone channel and the bass channel audio signals from the
power amplifier 200 When the level is excessive, a control signal for controlling the level
adjustment circuits 13 and 23 is formed so as to lower the level of the audio signal of the
corresponding channel, and is supplied to the level control circuits 13 and 23.
[0029]
Then, the audio signals whose levels have been adjusted in the level adjustment circuits 13 and
23 are led out to the output terminals 15 and 25 through the equalizers 14 and 24, respectively.
[0030]
As described above, since the level of the audio signal is adjusted in the level adjustment circuits
13 and 23, the speaker 300 can be protected from being supplied with an audio signal having an
excessive level.
[0031]
In this example, the level control signal forming circuits 32 and 42 generate excessive audio
signals from the input terminals 31 and 41, that is, the audio signals of the high tone and low
tone channels from the power amplifier 200 are excessive. Then, a signal indicating that this is
excessive is obtained, and this signal is supplied to the light emitting diodes 36, 46, whereby the
light emitting diodes 36, 46 are caused to emit light to alert the user.
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[0032]
The audio signals from the equalizers 14 and 24 supplied to the output terminals 15 and 25 are
also supplied to audio signal monitoring circuits 34 and 44.
The audio signal monitoring circuits 34 and 44 in this example monitor the state of the audio
signals of the treble channel and the bass channel from the equalizers 14 and 24 by monitoring
the level of the audio signal of the treble channel and the bass channel, respectively. Monitor.
[0033]
The monitoring results of the audio signal monitoring circuits 34 and 44 are supplied to the
determination circuits 35 and 45.
[0034]
On the other hand, the audio signals of the treble channel and the bass channel from the power
amplifier 200 are supplied to the audio signal monitoring circuits 33 and 43 through the input
terminals 31 and 41, respectively.
[0035]
Then, in the case of this example, these audio signal monitoring circuits 33, 43 are similar to the
audio signal monitoring circuits 34, 44 described above, and the magnitudes of the levels of the
audio signals of the high tone channel and the bass channel from the power amplifier By
monitoring, the state of the audio signal of the treble channel and the bass channel from the
power amplifier 200 is monitored.
[0036]
The monitoring output signals from the audio signal monitoring circuits 33 and 34 are supplied
to the determination circuit 35 for the audio signal of the high-tone channel, and the
determination circuit 35 generates the high-pitched sound of the channel divider 100 based on
both monitoring output signals. Although the circuit system of the channel is normal, it is
determined that the circuit system of the high-pitched channel of the power amplifier 200 is
abnormal.
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When the determination circuit 35 detects the abnormality, the determination circuit 35 outputs
an abnormality detection signal for causing the LED 37 to emit light, and notifies the user of the
abnormality by the emission of the LED 37.
[0037]
The monitoring output signals from the audio signal monitoring circuits 43 and 44 are similarly
supplied to the determination circuit 45 for the audio signal of the bass channel, and the
determination circuit 45 determines the bass channel of the power amplifier 200 based on both
monitoring output signals. It is determined whether or not the circuit system is abnormal.
When the power amplifier 200 is abnormal, an abnormality detection signal for causing the LED
47 to emit light is output, and the user is notified of the abnormality by the emission of the LED
47.
[0038]
In this example, the abnormality detection signals from the determination circuits 35 and 45 are
also derived to the output terminals 38 and 48 and connected to the output terminals 38 and 48,
for example, to control devices such as a computer. An abnormality of the amplifier 200 can be
notified.
[0039]
Next, FIG. 2 shows a specific example of a circuit portion that determines the abnormality of the
power amplifier and notifies the user of the abnormality occurrence.
As indicated by the broken line in FIG. 1 described above, in this example, the abnormality of the
power amplifier 200 can be detected for each voice system of the high tone channel and the low
tone channel. The circuit portions of the judgment and notification of the abnormality of the
power amplifier 200 have exactly the same configuration between the channel and the bass
channel.
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Therefore, FIG. 2 shows a case where the abnormality of the circuit system of the high tone
channel of the power amplifier 200 is determined by monitoring the audio signal of the high
tone channel, and the user is notified of it.
[0040]
As shown in FIG. 2, the audio signal monitoring circuit 34 of the treble channel of the channel
divider 100 includes a rectifier circuit 341, a comparator 342, and an inverter 343.
Further, the audio signal monitoring circuit 33 of the high-pitched channel of the power amplifier
200 includes a rectifier circuit 331 and a comparator 332.
[0041]
The audio signal of the treble channel of the channel divider 100 is supplied to the rectifier
circuit 341, converted into a DC signal, and supplied to the comparator 342.
The comparator 342 compares the input signal level value with a preset predetermined level
value.
Then, the comparison result is output as a binarized signal.
[0042]
In this case, the comparator 342 outputs a 0 signal when the level of the supplied signal is
equal to or higher than a predetermined level value.
In addition, when the level of the supplied signal is smaller than the predetermined value, the
signal "1" is output.
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[0043]
The comparison result of the comparator 342 is inverted by the inverter 343.
As a result, when the input audio signal of the audio signal monitoring circuit 34 is a low level
signal from the inverter 343, a signal of "0" is obtained, and when the input audio signal is a high
level signal, A "1" signal is obtained, which is obtained as an output signal from the monitoring
circuit 34 as shown in FIG.
The signal obtained from the inverter 343 is supplied to the determination circuit 35.
[0044]
On the other hand, the audio signal of the high-pitched channel of the power amplifier 200 is
supplied to the rectifier circuit 331, rectified, and supplied to the comparator 332.
[0045]
The comparator 332 compares the input signal level with a preset level value, and when the level
of the input signal is equal to or higher than the preset level value, outputs a 0 signal, and
inputs When the level of the signal is smaller than the predetermined level value, a signal of "1"
is output.
Then, the output signal from the comparator 332 is supplied to the determination circuit 35 as
the output of the monitoring circuit 33 (see FIG. 3).
[0046]
The determination circuit 35 is configured of an AND circuit 351 in this example.
This AND circuit 351 becomes 1 only when the signals from the audio signal monitoring
circuit 33 and the audio signal monitoring circuit 34 are both 1 as shown in FIG. An
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abnormality in the circuit system of the treble channel of the amplifier 200 is detected.
[0047]
Then, when the output of the AND circuit 351 becomes 1 , the transistor 371 is turned on, so
that a current flows through the LED 37, and the LED lights up, indicating that there is an
abnormality in the high tone channel system of the power amplifier 200. Display alarm.
At this time, since the transistor 372 is turned on, the signal of the output terminal 38 is 1 ,
and the occurrence of a system abnormality of the high-pitched channel of the power amplifier
200 is notified to the personal computer etc. to which the output terminal 38 is connected. Do.
[0048]
Note that, originally, when the binarized signal of the output level of the audio signal of the
channel divider 100 and the binarized signal of the output level of the audio signal from the
power amplifier 200 do not match, it is regarded as abnormal. When the output signal of the
channel divider is low in FIG. 3 and the output signal of the monitoring circuit 34 is 0 in FIG.
3, the output signal of the power amplifier 200 is high and the monitoring circuit is high. Even
when the output signal of 33 is "0", it is desirable to detect as an abnormality.
However, since such a state does not usually occur, the above state is not detected as abnormal
in the above example.
[0049]
However, even in such a case, it may be necessary to determine as an abnormality.
This can be realized by using an exclusive NOR circuit in the determination circuits 35 and 45.
[0050]
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FIG. 4 is a diagram showing the relationship between the input signal and the output signal of the
determination circuit 35 when the determination circuit 35 uses an exclusive NOR circuit. Then,
in this case, even when the level of the output signal from the audio signal monitoring circuit 34
is low and the level of the output signal from the audio signal monitoring circuit 33 is high, the
determination circuit 35 also outputs the abnormality detection signal. It can be output.
[0051]
Of course, as in the case where the AND circuit is used, the abnormality detection signal is also
obtained when the level of the output signal from the audio signal monitoring circuit 34 is high
and the level of the output signal from the audio signal monitoring circuit 33 is low. Is output.
[0052]
Even if any of the logic circuits is used for the determination circuits 35, 45, a holding circuit or a
reset circuit may be provided to hold the abnormality detection signal from the determination
circuits 35, 45.
[0053]
That is, until the abnormality of the treble channel of the power amplifier 200 is removed, the
abnormality detection signal is held in the holding circuit, and the user continues to be notified of
the alarm.
Then, when the abnormality is removed, the signal held in the holding circuit is cleared by the
reset by the user, and the alarm notification is ended.
[0054]
Thus, even when the audio signal of the channel divider 100 is not input, the user can recognize
the abnormality of the power amplifier 200 if the abnormality detection signal is output before
that.
[0055]
As described above, when an acoustic system is formed using this channel divider 100, it is
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possible to construct an acoustic system that does not use a detector or a signal distributor as
another unit device.
[0056]
In the above example, the case where only the power amplifier 200 is connected between the
channel divider 100 and the speaker 300 is described as an example, but the electronic device to
be connected is not limited to the power amplifier. The present invention is also applicable to the
case where electronic devices for processing other audio signals are connected.
[0057]
As described above, according to the channel divider according to the present invention, by
constructing an acoustic system using this, a detector and a signal distributor as a separate unit
device become unnecessary.
For this reason, it is possible to construct an audio system with simple wiring and low cost.
[0058]
In addition, since the channel divider according to the present invention can detect an
abnormality of the electronic device connected to the subsequent stage of the channel divider by
monitoring an input audio signal from a conventional input terminal, the abnormality of the
electronic device can be detected. It is not necessary to newly provide an input terminal of a
signal that needs to be monitored to detect.
[0059]
Brief description of the drawings
[0060]
1 is a block diagram for explaining an embodiment of a channel divider according to the present
invention.
[0061]
2 is a diagram for explaining a circuit portion for detecting an abnormality of the electronic
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device of one embodiment of the channel divider according to the present invention.
[0062]
3 is a diagram for explaining the determination circuit of one embodiment of the channel divider
according to the present invention.
[0063]
4 is a diagram for explaining an example of another determination circuit of one embodiment of
the channel divider according to the present invention.
[0064]
5 is a block diagram for explaining an audio system using a channel divider according to the
present invention.
[0065]
6 is a block diagram for explaining a sound system using a conventional channel divider.
[0066]
Explanation of sign
[0067]
11 input terminal 12 high pass filter 22 low pass filter 13, 23 level adjustment circuit 14, 24
equalizer 15, 25 output terminal 31, 41 input terminal 32, 42 level control signal forming circuit
33, 43 audio signal monitoring circuit 34, 44 audio signal monitoring circuit 35, 45
determination circuit 36, 46 light emitting diode 37, 47 light emitting diode 38, 48 output
terminal
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