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JPH0582200

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DESCRIPTION JPH0582200
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
automotive audio equipment, and in particular, to means for improving the sense of sound field.
[0002]
2. Description of the Related Art FIG. 3 shows an example of a conventional on-vehicle audio
apparatus using a digital signal processor (DSP). As shown in the figure, the L channel and R
channel signals of the head unit 5 such as a CD player are input to the DSP 7, and a signal
obtained by delaying the input signal, a reflected wave, reverberation and the like is added to the
input signal. It generates L channel and R channel signals (FL and FR) and rear speaker L channel
and R channel signals (RL and RR).
[0003]
The output signals of the DSP 7 are amplified by power amplifiers 6a, 6b, 6c and 6d, respectively,
to drive the front speakers 2a and 2b and the rear speakers 3a and 3b.
[0004]
[Problems to be Solved by the Invention] In the above-mentioned conventional on-vehicle audio
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1
equipment, there is no signal to be input to the DSP when there is no signal from the head unit,
and there is no effect of sound field improvement. was there.
In addition, when adding delayed signals, reflected waves, and reverberations in the DSP,
properly mix the left and right sounds, adjust the frequency characteristics and phase, and give a
natural feeling by using only the DSP operation. Was difficult.
[0005]
The present invention has been made in view of the above-described point, and its object is to
provide a natural sound field feeling by performing DSP processing on the sound in the
passenger compartment and reproducing it. It is in.
[0006]
According to the present invention, there is provided an on-vehicle acoustic device having at least
one or more speakers in a vehicle compartment, wherein at least one microphone is disposed in
the vehicle interior, The signal collected by the microphone is processed by a digital signal
processor and then reproduced by the speaker.
[0007]
Further, in the above-mentioned in-vehicle acoustic apparatus, as the digital signal processor, one
using a signal obtained by delaying the input signal, a reflected wave and a reverberation sound
added to the input signal, and further adjusting the frequency characteristic and the phase
characteristic It is.
[0008]
According to the in-vehicle acoustic device of the present invention, the microphone is installed
at an appropriate position in the vehicle compartment, and the DSP adds a delay signal, a
reflected wave, a reverberation sound, etc.
[0009]
As a result, DSP processing is performed on the background noise even when music or the like is
being reproduced from the speaker or not.
[0010]
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2
Therefore, the sound in the passenger compartment is subjected to the sound field processing by
the DSP even when there is no signal.
Furthermore, the sound of the L channel and R channel is appropriately mixed in the vehicle
compartment, and the high frequency signal is attenuated in a form close to the reflected wave or
reverberation in a normal room or hall due to the transmission characteristic in the vehicle
compartment Therefore, a more natural sound field can be obtained.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An on-vehicle acoustic apparatus
according to an embodiment of the present invention will be described with reference to FIGS. 1
and 2. FIG.
FIG. 1 is a view showing the arrangement of a speaker and a microphone in the case where a
vehicle-mounted acoustic device according to an embodiment of the present invention is applied
to a sedan.
As shown in the figure, front speakers 2a and 2b are attached to the front door of the sedan car
1, and rear speakers 3a and 3b are attached to the rear tray.
[0012]
Microphones 4a and 4b are attached to the ceiling of the car so as to be located in the center and
in front of the driver's seat and the passenger's seat, and collect sounds in the passenger
compartment.
[0013]
The speaker and the microphone are connected as shown in FIG.
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3
From the head unit 5 shown in FIG. 2, the L channel signal on the front side, the R channel signal,
the L channel signal on the rear side, and the R channel signal are output and added to the power
amplifiers 6a to 6d, respectively.
[0014]
On the other hand, the signals collected by the microphones 4a and 4b are amplified by the
microphone amplifiers 8a and 8b, respectively, and then the DSP 7 adds a delayed signal, a
reflected wave and a reverberant sound, and further adjusts the frequency characteristics and
phase. It is added to the power amplifiers 6a to 6d.
[0015]
The power amplifiers 6a to 6d mix and amplify the input signals, and drive the front speaker 2a,
the front speaker 2b, the rear speaker 3a, and the rear speaker 3b by the output of the power
amplifiers 6a to 6d.
[0016]
According to the above configuration, even if there is no signal from the head unit 5, the dark
noise collected by the microphones 4a and 4b is subjected to DSP processing and reproduced, so
that the effect of sound field improvement achieved by the DSP can always be obtained. Will be
[0017]
Thus, the listener can always enjoy the sound field improvement effect by the DSP.
Furthermore, the signals of L channel and R channel are appropriately mixed in the vehicle
interior, and the high frequency signal is attenuated in a form close to the reflected wave or
reverberation in a normal room or hall due to the transmission characteristic in the vehicle
interior Therefore, a more natural sound field feeling can be obtained, and extremely natural
sound field simulation can be performed.
[0018]
According to the in-vehicle acoustic device of the present invention, since the DSP processing is
performed on the sound collected by the microphone installed in the vehicle compartment, even
if there is no sound from the head unit, the DSP can The processed background noise is
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reproduced from the speaker, and the listener can always enjoy the sound field improvement
effect by the DSP.
[0019]
Also, the signals of L channel and R channel are appropriately mixed in the vehicle cabin, and the
high frequency signal has a form close to a reflected wave or reverberation in a normal room or
hall according to the transmission characteristics in the vehicle cabin. Because of the attenuation,
a more natural sound field feeling can be obtained, and extremely natural sound field simulation
becomes possible.
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