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Description or title of the invention
Sound equipment
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an audio device,
mainly mounted on a car, for reproducing music tape during radio broadcasting. Conventionally,
the volume control of the in-vehicle acoustic device is difficult to hear while traveling or when
the noise inside and outside the single base is highly respected, so it must be performed
manually by humans and the volume is optimally adjusted in that state Stopped at a quiet place,
the volume is too loud, and the volume tll again! There was a drawback that it had to be IL. In
order to eliminate the above-mentioned drawbacks, for example, in the case of in-vehicle use, 1 (a
method of changing the volume according to the speed of the carriage, α) a method of changing
the volume using low frequency sound in the vehicle compartment ing. However, in any of the
above methods (υ, I), for example, the volume changes independently of other tracks running in
parallel in a car or noise from a bus etc., and the volume is automatically adjusted according to
the surrounding environment The present invention was made to eliminate the above-mentioned
drawbacks of the prior art, and according to the ambient noise, the sound volume can be
properly adjusted by KI #. It is an object of the invention to provide EndPage: 1 or less, one
embodiment of the present invention will be described based on the drawings. 1 and 2 show an
example of an audio apparatus according to the present invention. In FIG. 1, (1) receives and
demodulates a radio broadcast and reproduces a cassette tape to reproduce an audio signal. Is a
voltage control gain adjustment circuit which is a control amplification circuit, (3) is an audio
amplification circuit, (4) is a switching circuit, and (6) is a speaker which is an electric-voice
conversion means, (6) detects the level of the audio signal from the audio signal generation
source (1), and when this level falls below a predetermined value, that is, when a zero signal is
detected, detection that outputs a switching signal consisting of pulses The circuit (7) is a noise
amplifier, (8) is a detection circuit, (@) is an integration circuit, and these (7) to (9) constitute a
control means. In FIG. 2, @, (Q, (Di,... Indicate the operation waveforms of each block in FIG. 1). In
the audio apparatus configured as described above, when the audio signal a as shown in FIG. 2
(2) is output from the audio signal generation source (1) in FIG. 1 (9), the detection circuit (-) in
FIG. When the level of the audio signal island becomes lower than a predetermined value, for
example, substantially zero, a switching signal of positive pulse shown in FIG. 2 is generated. Due
to this switching signal, the amplifier circuit (3) and the speaker (5) are disconnected and
engaged in the switching circuit (4) shown in FIG. 1 and the speaker (5) and control means (6)
are connected.
By this, the speaker (6) detects the noise, for example, as shown in FIG. 2 in the vicinity when
there is noise, and obtains the noise signal dt- shown in FIG. This signal is amplified by the noise
amplification circuit (7) and detected by the detection circuit (8), and the integration circuit (9)
generates a control signal e consisting of voltage signals as shown in FIG. When a high level
voice signal island is output from the voltage control source (1) in the figure * # i, that is, the
detection circuit (6) does not generate switching signal at all times, therefore the switching
circuit (4) Connects the audio amplification circuit (3) and the speaker (6), and audio is generated
from the speaker (5). As described above, according to the present invention, when the audio
signal becomes substantially zero, the audio signal output is switched and the speaker is used as
a noise detector. There is an effect that it is possible to automatically control the sound volume of
the above-mentioned single mount acoustic device according to the noise cover without taking
positive feedback.
4. Brief description of the drawings # i1 Figure is a system diagram showing an embodiment of
the present invention, Figure 2 is a signal waveform diagram of each part of Figure 1 0 (1)-· ·
audio signal generation source ( 2) ... control amplification circuit, (3) ... speech amplification
circuit, (4)-... switching circuit, (5) ... electricity-to-speech conversion means% (6)-... detection
circuit, ( 7)-noise amplification circuit, (3) detection circuit, (9) integration circuit, (2) control
means, a: audio signal, b, switching signal, d ... noise signal, e ... control signal. In the drawings,
the same reference numerals indicate the same or corresponding parts. Agent Shino Shinno-(1st
person) 1st 閏 θ / EndPage: 2
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description, jps57186900
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