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DESCRIPTION JPS58124314

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DESCRIPTION JPS58124314
[0001]
The present invention relates to an automatic volume control apparatus which prevents sound
volume rise of a sound device even if a certain level of noise is generated in a car when an alarm
sound (a horn) of a self-pity or a storm is generated. FIG. 1 is a block diagram of a conventional
automatic sound 1-adjusting device of an automobile audio system. According to the first
embodiment, the output d from the sound device 1 and the speaker 2 all valves L2 are radiated
to the outside, and the detector 3 detects the power and inputs it to the adder 5 via the phase
inverter 4. . On the other hand, the micro collects the noise and the sound from the speaker 2,
amplifies its output by the amplifier 7, then detects it by the detector 8 and manually operates
the adder 5. The adder 5 adds the output of the detector 8 and the output of the phase inverter 4
and inputs the addition result to the filter 9 to extract only the noise signal. This noise signal "i +"
is detected by the wave detector 10, passes through the time constant circuit 11, and is judged
according to the level of the electronic volume 12 total noise signal. The noise signal is added to
the filter 9 according to the sense of human being, and the time constant circuit 11 is also made
to change gradually against the rapid change of the noise. In such a conventional automatic lf
sound @ device automatic sound 1.1 adjustment device, when the VC1 late-in-coming person
sounds a horn to prevent danger, in the conventional automatic volume control device, There is a
drawback that the microphone picks up the sound of the horn and the driver has to concentrate
on the nerve to avoid danger, and the sound of the acoustic device is increased. In tfc, the
conventional automatic volume control product, if there is a noise in the car, there is a drawback
that the volume increases without restriction, and it is not preferable 1- <for traffic safety. This
invention is intended to eliminate the above-mentioned conventional defects Z, and it is possible
to make a horn sound fc if it is possible to increase the volume of the sound device without
restriction even if the noise rises, traffic safety The purpose is to provide an automatic volume
control device that is favorable from the point of view. An embodiment of the automatic volume
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control device according to the present invention will be described below with reference to the
drawings. FIG. 2 is a block N showing the configuration of that embodiment. In FIG. 2, in order to
avoid duplication, the same reference numerals are given to g + 'ib and the same autopsy partial
pressure [, and the explanation thereof is omitted, and parts different from FIG. I will say. As
apparent from FIG. 2 and the comparison 1- also in FIG. 2, the switch 21 is provided between the
detector 8 and the adder 5 in FIG. When the horn switch 22 is on, the switch 21 is off.
Conversely, when the horn switch 22 is off, the switch 21 is on. The horn switch 22 is connected
in series with one of the noise generating elements and the horn 24 of the fifth via a power
supply 23. The other configuration is the same as that of FIG. Next, the automatic sound note (the
operation of the adjustment device of the present invention configured as described above will be
described. When the horn 24 is not sounded, the horn switch 22 is off and therefore the switch
21H is on. When the switch 21 is on, the normal operation similar to that of the brush 1 is
performed. Further, when the horn 24 is sounded, the 4 = 1 degree horn switch 22 is turned on,
and the switch 21 is turned off interlockingly therewith. As a result, the detector 8 and the adder
5 are disconnected, and the micro output is not input to the adder 5. That is, the input level of
the micro system adder 5 becomes 0, the output of the acoustic device 1 is detected by the
detector 3, and the phase inverter 4 performs phase inversion 1. Signal is input to the adder 5.
The output of the adder 5 depends only on the output of the acoustic device 1, and the output of
the adder 5 is filtered. Detector 10, time constant circuit 11 '(R through electronic volume 12 is
fully controlled, but at this time only the output of phase inverter 4 is skewed to adder 5 and this
tl is output. The output of the unit 5 operates in the direction of decreasing the volume level of
the electronic volume 12 and the acoustic device 1 when the unit 5 is negative. At this time, since
there is the time constant circuit 11, the volume level gradually decreases and finally the sound!
# Volume level from device 1 will be 0. FIG. 3 is a block diagram showing a second embodiment
of the present invention. In the case of FIG. 13, a hold circuit 25 is provided between the output
end of the adder 5 and the filter 9, and when the horn switch 22 is turned on, that is, when the
horn 24 sounds, the horn switch 22 is turned on. The output level of the adder 5 at that time is
held, and the volume level of the audio device 1 is fixed. FIG. 4 is a block diagram showing an
embodiment of the automatic volume control apparatus F3 according to the present invention. In
FIG. 4 also, the same parts as in FIG. 2 and FIG. The description will be omitted altogether, and
the characteristic features will be described in FIG. In the case of FIG. 4, the output end of the
time constant circuit 11 shown in the block diagram of FIG. 1 is connected to one input end of
the newly added adder 26 with the switch Sl connected to one end of the adder 26 The output
end of the setting storage circuit 27 is connected to the other input end of the adder 26.
The output of the adder 26 is supplied to the electronic volume 12. Furthermore, the horn switch
22 and the switch SI interlock with each other. Next, the operation will be described. A
predetermined volume level is stored in the initial setting storage circuit 27 first, and the stored
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content is added to the other input terminal of the adder 26. On the other hand, the noise level
picked up by the micro is amplified by the amplifier 7, detected by the detector 8 and added to
the input end of the adder 5, and the output of the acoustic device 1 is detected by the detector 3
in the adder 5. The signal detected and phase-inverted by the phase inverter 4 is also added. The
adder 5 filters the addition result of the output of the detector 8 and the output of the phase
inverter 4. The entire detector 10 is added to the time constant circuit 11. In this case, if the horn
24 is not sounded, the horn switch 22 is off, and the switch S1 interlocking with it is on.
Therefore, at this time, the output of the time constant circuit 11 is connected to one input
terminal of the adder 26 via the switch sI. When the horn 24 sounds, the output of the time
constant circuit 11 (noise level picked up by the micro) and the initial setting volume level set in
the initial setting storage circuit 27 are added by the adder 26. [2, the addition result is Supply
electronic volume 12 to electronic volume 12 When the horn 24 is to be sounded, the horn
switch 22 is turned on and the switch S is turned off. As a result, the output of the time constant
circuit 11 is supplied to the adder 26 (and only the initial setting volume level set by the initial
setting storage circuit 27 is added to the adder 26, and when the horn 24 sounds, At an instant
this preset volume level is applied to the electronic volume 12 through the adder 26. Therefore,
the output of the acoustic device 1 is adjusted to this default volume level. In addition, since the
temporary constant circuit 11 is connected to the adder 26 through the switch S1 when the horn
24 sounds, even if the output of the micro circuit is sharply increased, the acoustic device is
more gently than the time constant circuit 1117 m. When the output of 1 changes and the horn
24 is sounded, it returns to the initial setting volume instantly. FIG. 5 is a block diagram showing
a fourth embodiment of the automatic volume control according to the present invention. In the
case of FIG. 5, a control circuit unit 28 is provided between the output terminal of the detector 8
and the adder 5 to control opening / closing control of the switch S ? between the time constant
circuit 11 and the booster 26. This is performed by the circuit unit 28.
That is, when the volume of the sound collected from the micro becomes equal to or higher than
a predetermined level, the control circuit unit 28 turns off the switch SI. When the switch S1 is
turned off, the output of the time constant circuit 11 is not added to the adder 26, and the adder
26 receives the "i" L "fc initial setting volume level stored in the initial setting storage circuit 27.
The electronic volume 12 is controlled at this default volume level. That is, when the switch SI is
turned off, the output of the audio device is automatically returned to the default volume level.
By doing this, the sound volume of the acoustic device 1 is lowered even if the interior of the
vehicle is more noisy than necessary due to noise generating elements such as horns and
conversations, and the noise in the vehicle can be reduced even a little to prevent the accident. It
is. Further, the switch s1 in FIG. 5 is turned on by the horn in addition to the control circuit unit
28. Even if it is turned off, as described in more detail than 0, the automatic volume device
mounting device of the present invention detects the noise from the noise generating element of
the automobile and detects the noise even if the noise exceeds a predetermined level. As a result,
the volume level of the acoustic device is not increased when the horn is sounded to prevent
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danger in operation. In addition, even if the noise in the car rises above a certain level, the sound
volume of the sound device does not increase, and it is possible to remove the obstacle of safe
driving.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of a conventional automatic volume control device for a car audio
system, FIG. 2 is a block diagram of an embodiment of the automatic volume control device
according to the present invention, and FIGS. It is a block diagram of another Example of the
automatic volume control apparatus of this invention.
1 ...... acoustic device 2 ...... speaker 3.8.10 ...... detector 4 ...... phase inverter 5,26 ...... addition 6 и и
и Microphone 9 и и и Filter 11 и и и Time constant circuit 12 и и и Electronic volume 21, Sr и и и и и и и и и и и
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