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BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an
automatic volume control device for a vehicle-mounted audio device. Applicants, already
proposed as an automatic volume control device as shown in FIG. In the figure, 1 is an on-vehicle
acoustic device, 2 is a speaker, 4 is a phase converter, 5 is an adder, 6 microphones, 12 is an
electronic volume. ! The noise is added to the O reproduction sound and the noise of the car etc.
from the speaker 2 which is dyed inside or outside of the Ichlo ySIIi car and driven by the sound
device l to detect the volume. The volume is amplified by the amplification unit 7 and input to the
adder 5 through the detection rjIg while the phase is inverted by the phase inverter 4 through
the reproduction sound detector 3 from the acoustic device 1 and the post-post adder SK input
Do. Only the noise signal is extracted by the signal including the noise and the reproduction
signal expansion / addition wb5 from the acoustic device 1, and the noise signal is filtered by the
filter 8. The time constant circuit 11 is inputted through the liquid detector 10. If it is assumed
that the noise signal is large at a whistle, the electronic polyme of the acoustic device l is
gradually increased. The lower the noise level, the louder the electronic polymime can be. That is,
the sound volume of the sound device 1 increases as the noise increases in the device 9 shown in
FIG. 1, and the sound volume of the sound device 1 decreases as the noise decreases. However, in
the automatic volume control device of FIG. 1, the volume increases as the external noise
increases, so the volume is increased in response to the alarm sound of emergency vehicles and
other vehicles, and the bell cut off of the turning off. have. In particular, since an emergency car
or the like travels on a general road at a considerable speed, even though a general vehicle must
travel slowly, etc., the reproduced sound from the acoustic device is increased and it can not be
noticed. This is undesirable for safety. The present invention solves the above-mentioned
drawbacks of the conventional devices, and is a book which automatically reduces the sound
volume of the sound device when necessary for traffic safety. One embodiment of the present
invention will be described based on FIG. First, a detection unit 21 includes a microphone or the
like, and the detection unit 21 is connected to the NoTCH circuit 22. A level detector 23 is
disposed downstream of the NoTCkI circuit 22, and a comparator 24 is disposed in the level
detector 23OI & stage to compare a reference circuit generating a reference voltage with a
voltage generated from the level detector 23. ing. The output from the comparator 24 is
branched into a circuit passing through the 08M (one-shot multi) circuit unit 26 and the pulse
generation circuit unit 28 and those directly input to the AND circuit 27.
An O8M circuit 29, a control unit 30, and an ATT circuit unit 31 are disposed downstream of the
AND circuit 27. Reference numeral 32 denotes an audio device such as a car stereo. Next, the
operation will be described. An external noise is picked up by the detection unit 21. Here, a
specific frequency may be output as a special pilot signal to make special the frequency of the
alarm sound generated by the emergency automatic force. And the characteristics of the NoTCH
circuit 32 are set to pass the frequency person. The signal of the specific frequency which has
passed through the NOTCH circuit 32 is level-detected by the level detector 23 and converted
into a DC voltage. The comparator 24 compares the level-detected signal with the reference
electrons generated from the REF 25. According to the above-described configuration, a signal is
generated from the comparator 24 when the emergency vehicle approaches or is traveling at the
same speed in the same direction. (This is a so-called doppler effect, which is due to the fact that
the frequency goes up as the sound source approaches and the frequency falls as it goes away K.
Next, the output signal from the comparator 24 branches into a circuit consisting of the 08M
circuit unit 26 and the pulse generation circuit unit 28 and a circuit directly inputted to the
comparator 27. The O8 Mfi path unit 26 detects the rising of the signal generated from the mach
comparator 24 and generates a pulse for a fixed time. The pulse generator that generates a pulse
when the pulse generated by the 08M circuit unit 21B is generated is input to the master NDI
circuit 27 after a predetermined time has elapsed by the 08M circuit unit 26. Here, ANDla ? 27
is applied with a signal directly input from the comparator 24 and a signal input from the pulse
generator. According to the above configuration, the signal is delayed for a predetermined period
of time to compare the current signal with that of the current signal and to operate when the
signal is continuously input for a predetermined period of time. In other words, it does not
operate unless the emergency automatic force approaches continuously for a certain period of
time. Further, the signal from the gate ND circuit 27 is input to the O8M circuit unit 29, and the
control unit 30 is operated by the pulse generated by the 08M circuit unit 29 to turn on and off
the switch TTC. This attenuates the acoustic device 320 output. Fig. 3 shows the timing
waveform of the expansion operation 9, 9 (1), <2), (3) show a state in which the 08M 29 operates
to attenuate the signal, Fig. 4 (4), ( 5) I (a) shows a state where it is not attenuated. Although the
comparison is made according to the voltage in the embodiment of the present invention, the
comparison of the frequency may be made.
Furthermore, although ATT was operated by the control unit, electrons and if volume may be
operated by the control unit via a time constant circuit. According to the present invention
having the above-described configuration, the volume of the in-vehicle acoustic device can be
automatically reduced by the approach of an emergency vehicle or the like, which helps prevent
a danger.
Brief description of the drawings
FIG. 1 shows a device which has already been proposed, FIG. 2 shows a device according to the
invention, and FIG. 3 is a timing chart showing the output of the main tatami block shown in FIG.
21 иииииии Detection unit 22 иииииии N0 TCH23 иииииииии Level detection 24 ииииии Comparator 25 иииииииии
Reference signal 26. 29 08M27 ииии AND 28 ииииии pulse generator 30 ..... control - road 31 ......
attenuator 32 ...... audio equipment applicant Pioneer Corporation second Fig. 3
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description, jps58150314
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