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JPH05301542

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DESCRIPTION JPH05301542
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
body sensation sound apparatus, and more particularly to a body sensation sound apparatus for
use in a car.
[0002]
BACKGROUND OF THE INVENTION In addition to the acoustic effect of an acoustic device that
transmits musical tones by air propagation like a speaker, a body sensation acoustic device
converts low-frequency component signals extracted from an audio signal into mechanical
vibration, which is converted into a body vibration. It is intended to enhance the sense of realism
by making people directly
[0003]
FIG. 1 shows the configuration of a conventional in-vehicle body sensation sound system.
The volume adjustment means 1 performs manual volume adjustment of the input tone signal,
and supplies the adjusted tone signal to the compressor 2 and the amplifier 3. The tone signal is
amplified by the amplifier 3 and reproduced by the speaker 4. The speaker 4 is disposed at an
appropriate position in the vehicle compartment. The compressor 2 applies the gain conversion
as shown by the solid line in FIG. 2 to the tone signal in accordance with the magnitude of the
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input level of the tone signal, and compresses and converts the level, and supplies the
compressed tone signal to the low pass filter 5. Do. The compressor 2 keeps the level of the tone
signal at a level at which human can feel a comfortable low tone. The low pass filter 5 supplies
only the low frequency component signal of the compressed tone signal to the amplifier 6. The
cutoff frequency of the low pass filter 5 is, for example, about 120 Hz, about -12 dB / oct. The
amplifier 6 amplifies the low frequency component signal and supplies the amplified signal to the
body sensation sound unit 8 built in the chair 7.
[0004]
In the in-vehicle body sensation sound system having such a configuration, the passenger adjusts
the volume adjustment means 1 to obtain reproduction sound and body sensation sound of any
size. However, in a vehicle that is susceptible to external vibration, there is a problem that the
low frequency due to the sensational sound is masked by the traveling vibration of the car, and
the original sensational vibration can not be obtained. Further, as a method of eliminating the
masking, there is a method of adjusting the level of the sensational sound device in accordance
with the traveling vibration of the vehicle. Conventionally, the level adjustment of the sensational
sound device has been performed by manual volume adjustment means. However, in manual
volume adjustment, it is impossible to perform level adjustment in a timely manner, and there is
a problem that a sense of discomfort sound is generated.
[0005]
SUMMARY OF THE INVENTION The present invention has been made to solve the above
problems, and it is possible to quickly release masking of body sensation sound due to vibration
during traveling of a car, and obtain in-vehicle sensation sound without discomfort. It aims at
providing a body sensation sound apparatus.
[0006]
According to the present invention, there is provided a car body sensation system according to
the present invention, comprising: a low pass filter for extracting only a low frequency
component of an input signal; amplification means for amplifying an output of the low pass filter
and transmitting an amplification signal; And a vibration unit disposed in the interior to convert
the amplified signal into mechanical vibration, wherein the vibration sensor generates a vibration
signal having a magnitude corresponding to the vibration of the vehicle body, and And level
adjusting means for adjusting the level of the input signal according to the average level.
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[0007]
According to the above-mentioned configuration, the input signal level to the vibration unit of the
body-sensing apparatus is automatically adjusted in accordance with the magnitude of the
traveling vibration of the car.
[0008]
EXAMPLES Examples of the present invention will be described below.
FIG. 3 is a view showing the configuration of the in-vehicle body sensation sound system of the
present invention.
The volume adjustment means 1 adjusts the volume of the input tone signal and supplies the
adjusted tone signal to the compressor 2 and the amplifier 3.
The tone signal is amplified by the amplifier 3 and reproduced by the speaker 4. The speaker 4 is
disposed at an appropriate position in the vehicle compartment. The compressor 2 applies a gain
conversion as shown by the solid line in FIG. 2 to the tone signal in accordance with the
magnitude of the input level of the tone signal, and compresses and converts the level. Supply.
The compressor 2 keeps the level of the tone signal at a level at which human can feel a
comfortable low tone. The sensor 10 is, for example, a vibration sensor directly connected to the
vehicle body, generates a vibration signal according to the magnitude of the vibration of the
vehicle, and supplies the vibration signal to the integration circuit 11. The integration circuit 11
supplies, for example, an 8-bit control signal corresponding to the average value of the vibration
signal to the level adjustment means 9 and the low pass filter 5a. The level adjustment means 9
performs level adjustment according to the control signal to the compressed tone signal, and
supplies the level-adjusted compressed tone signal to the limiter 12. The limiter 12 applies a
limiter to the amplifier 6 so as not to cause clipping by the compressed tone signal whose level
has been adjusted, and supplies it to the low pass filter 5a. The low-pass filter 5 a supplies to the
amplifier 6 only the low frequency component signal of the cut-off frequency determined by the
control signal among the signals from the limiter 12. The amplifier 6 amplifies the low-pass
component signal supplied and supplies the amplified signal to the bodily sensation sound unit 8
built in the chair 7.
[0009]
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Since the magnitude of the vibration of the vehicle is approximately proportional to the traveling
speed of the vehicle, the sensor 10 may be a speed sensor that generates a speed signal of the
vehicle and replaces this with a vibration signal. Next, the operation in the above configuration
will be described. As the vehicle starts to move and the vibration of the vehicle increases, the
level of the output signal of the sensor 10 increases. In response to the level increase of the
output signal, the integration circuit 11 performs control to lower the attenuation amount of the
level adjustment unit 9 and to increase the signal level input to the low pass filter 5a.
Furthermore, the integration circuit 11 performs control so as to raise the cutoff frequency of the
low pass filter 5a. Therefore, since the signal level input to the amplifier 6 is increased,
somatoacoustic vibrations generated by the somatoacoustic unit 8 are also increased. Therefore,
the sensational acoustic vibration level also increases automatically as the vibration level of the
vehicle increases.
[0010]
FIG. 4 is a view showing the configuration of a car body sensation type sound sensor as another
embodiment of the present invention, and the same functional blocks as in FIG. 3 are assigned
the same reference numerals. The compressed tone signal from the compressor 2 is supplied to
the level adjustment means 9 and the level adjustment control circuit 11a. The sensor 10
generates a vibration signal according to the magnitude of the vibration of the vehicle, and
supplies the vibration signal to the level adjustment control circuit 11a and the low pass filter
control circuit 11b. The level adjustment control circuit 11a subtracts the average value of the
vibration signal and the average value of the compressed tone signal, and supplies, for example,
an 8-bit control signal representing the result of the subtraction to the level adjustment means 9.
The level adjustment means 9 performs level adjustment according to the supplied control signal
to the input compressed tone signal, and supplies the level adjusted compressed tone signal to
the low pass filter 5a. The low-pass filter control circuit 11b analyzes the frequency of the
vibration signal and supplies, for example, an 8-bit control signal to the low-pass filter 5a to
lower the cut-off frequency of the low-pass filter 5a when the frequency component is low. When
the frequency component includes many high frequency components, a control signal for
increasing the cutoff frequency of the low pass filter 5a is supplied to the low pass filter 5a. The
low-pass filter 5 a supplies to the amplifier 6 only the low frequency component signal of the cutoff frequency determined by the control signal among the signals from the level adjustment unit
9. The amplifier 6 amplifies the low frequency component signal and supplies the amplified
signal to the body sensation sound unit 8 built in the chair 7.
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[0011]
Since the magnitude of the vibration of the vehicle is substantially proportional to the traveling
speed of the vehicle, the sensor 10 may be a speed sensor that generates a speed signal of the
vehicle.
[0012]
According to the present invention, the on-vehicle body sensation system of the present
invention employs a construction for detecting the vibration during transmission of the vehicle
and amplifying the low-pass component signal from the low pass filter with a gain corresponding
to the detected vibration level. Therefore, the input signal level to the vibration unit of the bodily
sensation sound system is automatically adjusted in accordance with the magnitude of the
traveling vibration of the car.
Therefore, masking of body sensation sound due to traveling vibration is quickly released, and
body sensation sound without discomfort can be obtained.
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