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DESCRIPTION JPH07245798

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DESCRIPTION JPH07245798
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
car audio system of a motor vehicle.
[0002]
2. Description of the Related Art FIG. 2 shows an example of a conventional car audio installed in
a car, and an electric signal output from a sound source 1 such as a tuner, a cassette deck or a
CD player is an amplifier 2 for a speaker. The sound is converted to sound by the speaker 3 and
output. In addition, a manual variable resistor 4 is connected to the sound source 1, and the
resistance value of the manual variable resistor 4 is manually changed to divide the output of the
sound source 1 and output it to the amplifier 2. Adjust the volume.
[0003]
In general, the magnitude of the noise in a car is different between running and slowing or
stopping. That is, since the number of revolutions of the engine increases during traveling, the
engine noise increases, and the number of revolutions of the engine decreases during slowing or
stopping, so the engine noise decreases. For this reason, in the above-mentioned conventional car
audio, when the volume of the speaker 3 is set to an optimal level during traveling by the manual
variable resistor 4, the speed becomes too high during slowing or stopping, and conversely,
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1
slowing Or when it is set to the optimal size at the time of stop, it becomes difficult to hear when
driving. Therefore, in order to always set the volume of the speaker 3 to an optimum level, it is
necessary to adjust the manual variable resistor 4 in accordance with the noise in the car, that is,
the traveling state of the car, which is a very troublesome operation. It becomes. Therefore, the
present invention is designed to be able to automatically adjust the volume of the car audio at the
time of traveling and at the time of traveling or stopping of the vehicle.
[0004]
According to the car audio apparatus of the present invention, a noise sensor for detecting noise
in a car and a low frequency component of an electrical signal outputted from the noise sensor
are extracted. If it is determined that the filter and the low frequency component output from the
filter are greater than the preset value, and if the determination determines that the filter is large,
the car audio volume is increased. And when it is determined that the volume is small, a volume
switcher is provided to restore the original volume. In the car audio apparatus of the invention of
claim 2, the volume switch is a resistor connected in series to a manual variable resistor for
manually adjusting the volume of the car audio, and a relay connected in parallel to this resistor.
It consists of a relay circuit which has a contact.
[0005]
In the car audio apparatus according to the first aspect of the invention, when the car is
traveling, the noise in the car becomes large, so the low frequency component of the electric
signal detected by the noise sensor and extracted by the filter is determined by the determiner. It
is determined that the value is larger than the preset value, and the volume switch increases the
volume of the car audio. Further, when traveling slowly or at a stop, the noise in the car
decreases, so it is determined that the low frequency component of the electric signal detected by
the noise sensor and extracted by the filter is smaller than the value preset by the determiner.
The switcher restores the car audio volume to its original level. Accordingly, the volume of the
car audio is automatically adjusted during running and during slowing or stopping. In the car
audio system of the second aspect of the invention, since the volume switch is formed of the
resistor and the relay circuit, the structure is simple and the miniaturization can be realized.
[0006]
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2
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows an embodiment of a
car audio system according to the present invention. A noise sensor 5 such as a microphone for
detecting noise in a car converts the detected noise into an electric signal. The filter 6 extracts
low frequency components that are mainly caused by engine noise and road noise caused by
tires, of the electrical signal output from the noise sensor 5. The determiner 7 determines
whether the low frequency component output from the filter 6 is larger than a preset value, and
outputs the determination result to the volume switch 8. The volume switch 8 is formed of a
resistor 8a connected in series to the manual variable resistor 4 and a relay circuit 8b having a
relay contact 8c connected in parallel to the resistor 8a. Further, when it is determined that the
low frequency component output from the filter 6 is larger than the preset value by the
determination unit 7, the relay circuit 8b puts the relay contact 8c in the "on" state, and is
determined to be small. Sometimes, the relay contact 8c is turned off.
[0007]
In the car audio system of the present invention, the volume of the speaker 3 is set to an
optimum level by the manual variable resistor 4 when the vehicle is traveling slowly or stopped.
In this case, the noise in the vehicle is detected by the noise sensor 5, and the low frequency
component of the electric signal is extracted by the filter 6 and output to the determination unit
7. At this time, since the vehicle is traveling slowly or at rest, the judging unit 7 judges that the
output from the filter 6 is smaller than a preset value, and the relay contact 8c of the relay circuit
8b is in the "off" state. When the vehicle travels, engine noise and road noise due to tires
increase, and the increased noise is detected by the noise sensor 5, and the low frequency
component of the electric signal is extracted by the filter 6 and output to the determiner 7. The
determination unit 7 determines that the output from the filter 6 is larger than a preset value,
and the relay contact 8c of the relay circuit 8b is in the "on" state. Accordingly, in the circuit from
the sound source 1 to the amplifier 2, the resistor 8a is bypassed and the resistance value is
reduced, so that the voltage applied to the amplifier 2 is increased, and as a result, the volume of
the speaker 3 is increased.
[0008]
In addition, when the vehicle travels slowly or stops from traveling, the relay contact 8c of the
relay circuit 8b is switched from the "on" state to the "off" state exactly contrary to the above
operation. As a result, in the circuit from the sound source 1 to the amplifier 2, the resistor 8a is
inserted, and the volume of the speaker 3 returns to the original level, which is lower than the
volume at the time of traveling.
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[0009]
As described above, according to the invention of claim 1, if the number of revolutions of the
engine during driving is increased and the noise in the vehicle is increased, the volume of the car
audio is automatically raised, and conversely, the vehicle is slowly driven or If the noise in the car
decreases at the time of stop, the volume is automatically reduced. Therefore, it is not necessary
to adjust the manual variable volume of the car audio one by one at the time of driving and at the
time of stopping or advancing. According to the second aspect of the present invention, since the
volume switch is formed of the resistor and the relay circuit, the structure is simple and
miniaturization is possible.
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