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JPS62257208

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DESCRIPTION JPS62257208
[0001]
TECHNICAL FIELD The present invention relates to an automatic noise compensation device that
is advantageously implemented, for example, in mounted sound tube substitutes such as
Carlanoo and car stereo. BACKGROUND ART During driving of a vehicle, the noise in the cabin is
relatively large. Therefore, the acoustic signal of the 1'tI on-board equipment is masked by the
noise. A typical prior art solution to this problem is to detect the level of the WJ in the cabin, the
sound level, and the level over the entire frequency band of the blind 1 signal from the sound π)
fixtures, the greater the gain as the noise burns up Configured to amplify at Problems to be
Solved by the Invention In such prior art, since the volume of the entire frequency band of the
sound signal is controlled according to the noise level, the Q person in the vehicle cabin feels
unnatural. Also, in order to output the sound π signal at a large volume, a large aperture speaker
and an input / output amplifier circuit are required. It is an object of the present invention to
provide an automatic system capable of enabling comfortable listening without noise that the
sound is masked by noise in a vehicle interior where noise is generated, and further miniaturizing
the configuration. It is to provide noise compensation vc. SUMMARY OF THE INVENTION The
present invention provides an acoustic signal source, a means for detecting the level of noise, an
acoustic signal from the acoustic signal source, and a large gain in the frequency band where the
second harmonic of noise is present. And in response to the detection output from the noise level
detection means! Means for increasing the gain over the entire frequency band of the acoustic
signal as the J sound level increases. Operation According to the invention, the acoustic signal is
amplified to a large gain in the frequency band in which the second harmonic of noise is present.
The sound No. 13 such as music generally includes the double overtone of an instrument or the
like. Generally, noise in a single car room is widely distributed in a frequency band of less than
100 Hz, and a noise level of, for example, about 40 Hz is large in 1). Therefore, an acoustic signal
in the losing band is masked in the presence of such noise. Therefore, in the present invention,
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amplification is performed so as to obtain a large gain as described above in the frequency band
in which the second harmonic of this noise exists. This makes it possible to listen to the second
harmonic of the acoustic Ini in the frequency and frequency range where there is no @ blindness
or a low noise level. This makes it feel as if listening to an acoustic signal in a frequency band
where noise is present.
Further, according to the present invention, as the noise level is increased, the gain over the
entire frequency band of the acoustic signal is increased. Therefore, masking of the acoustic
signal by the @ sound is prevented more surely. Embodiment 1 FIG. 1 is a block diagram of an
embodiment of the present invention. A sound π signal from an acoustic signal generating
source 1, which is an acoustic annizer for mounting a J1 such as a radio receiver and a magnetic
tape reproducing apparatus, is given to an amplifier circuit 3 from a line 2. This amplification
circuit 3 is flat over the entire frequency band of the acoustic signal as shown in FIG. And the
gain can be controlled by a control signal from line 4). The acoustic signal from the amplification
circuit 3 is provided to the filter 5. The filter 5 has the characteristics shown in FIG. This filter 5
j'-waves the sound I2J signal at a frequency m band where the second harmonic of noise in the
vehicle compartment of the car exists, that is, for example, around 80 Hz in this embodiment, and
the remaining circumference i Have a predetermined damping ratio. As shown in FIG. 4, the noise
level in the passenger compartment is widely distributed in the frequency band below 100 Hz,
generally, for example, the noise level around 4011 z is large. The filter 5 j5 waves of the
acoustic signal with a large gain around the second harmonic of such 40 Hz noise, that is, around
80 Hz. The gain of the filter 5 and the frequency at which the gain is large can be controlled by
the control signal from the line 6. The sound f3 from the filter 5 is amplified by the amplifier
circuit 7 and sounded by the speaker 8. rI! The level of noise in the wealth is detected by the
noise level detection means 9. This noise level detector 〇 9 may have a configuration for
actually detecting a noise level such as a microphone provided in a vehicle compartment, or a
speedometer for detecting the speed of an automobile, a single room window Like a detector that
detects the open / close state, and a detector that detects the operating state of the air
conditioner, it may be configured to predict the generation of noise and the level of the noise.
The output from the noise level detection means 9 is given to a processing circuit 10 realized by
a microcomputer or the like. Processing circuit 10 provides control signals on lines 4 and 6. The
processing circuit 10 is self 9! When the speed of the II car is low, the window is closed, or the
air conditioner is at rest and therefore the noise level is low, its gain is reduced by the entire
frequency band, and vice versa When the noise level is high, the gain of the amplifier circuit 3 is
controlled to a large extent.
Also processing times' v! 110 activates the filter 5 and controls the filter 5 so as to obtain a large
gain in the frequency band where the second harmonic of noise is present as described above,
that is, 8011 z. In this way, is the second harmonic of the instrument etc. included in the acoustic
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signal source 1? As well as being able to listen to J9i tone, the sound signal level of all frequency
bands is increased as the noise level is increased. Therefore, it is possible to listen comfortably
without causing a sense of incongruity over the entire frequency band, without the sound signal
being masked by noise. As described above, according to the present invention, in a place where
noise is generated, such as a car cabin of a car, the user can listen comfortably without causing a
sense of incongruity without masking an acoustic signal by the noise. It becomes possible.
Therefore, in the prior art described above, it is not necessary to use a large-aperture speaker, a
high-power amplifier circuit, etc. in order to amplify an acoustic signal over its entire frequency
band with the increase of g to generate a large sound. , The configuration is miniaturized.
[0002]
Brief description of the drawings
[0003]
1 is a block diagram of an embodiment of the present invention, m2 is a graph for explaining the
operation of the amplifier circuit 3, FIG. 3 is a graph for explaining the operation of the filter 5,
and FIG. It is a graph which shows the frequency distribution of the noise in a vehicle interior.
DESCRIPTION OF SYMBOLS 1 ... Sound signal generation source, 3, 7, ... Amplification circuit, 5 ...
Filter, 8 ... Speaker, 9 ... Noise level detection means, 10 ... Processing circuit agent Patent
attorney Some of the figures Fig. 1 Fig. 2 Ame anti t's Fig. 3 same wave number (Hz) Fig. 4
number of inter-tables (Hz)
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