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JPH03212000

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DESCRIPTION JPH03212000
[0001]
[Industrial field of application] The present invention reproduces an audio signal output from an
audio reproducing apparatus such as a CD player, a radio, a cassette deck, etc., by a pair of front
and rear speakers disposed in the front and rear of a vehicle compartment. Vehicle acoustic
system. SUMMARY OF THE INVENTION The present invention extracts the low band side and
high band side signals of the audio signal from the sound reproducing apparatus, and when the
respective signals exceed a predetermined level, the extracted low band side and the high band
side are extracted. It is characterized in that the high band side signal is added to the signal from
the sound reproduction device and supplied to a pair of front and rear speakers disposed in front
and rear of the vehicle interior. 2. Description of the Related Art In a conventional on-vehicle
audio apparatus, an audio signal from an audio reproducing apparatus is reproduced by a pair of
front and rear speakers disposed in front and rear of a vehicle interior. The rear speakers are
embedded in or fixed to the rear parcel tray, and the front speakers are embedded in the front
door or the instrument panel. [Problems to be Solved by the Invention] When the interior of a car
is viewed as a sound field space, the volume is small, so the distance between a listener such as a
driver and a speaker is short, and objects such as window glass with high reflectance and sound
are Surrounded by absorbing seats etc., the condition is extremely bad. Also, due to the nature of
the car, as shown in FIG. 4, noise such as engine noise with a low frequency of 500 Hz or less
(during idling) is transmitted to the passenger compartment, so a digital audio device such as a
CD has a dynamic range. The characteristics of a large sound reproduction device have not been
fully utilized. Therefore, there is also a woofer system that enhances the bass by adding signals in
the bass range, but also in this case there is a disadvantage that the sound gets stuck. Also, as
described above, the installation locations of the speakers are (1) embedded in or fixed to the
rear parcel tray (rear speakers), (2) embedded in the front door or instrument panel (front
speakers) 3) The combination of the two is extremely limited. And in the case of (1), a speaker
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with a relatively large aperture can be used, so while the low band can be reproduced
sufficiently, on the other hand, in the case of 6 (2) where the sound image is localized backward,
the listening position is localized Because they are asymmetrically close to the speaker. The
sound image is offset. Also in the case of (3), a rich and wide sound field is not formed, for
example, the sound image is localized around the head. [Object of the invention] The object of the
present invention is to increase the dynamic range in the bass range of the reproduced sound
from the front speaker by using a conventional speaker system in the vehicle interior, and to
emphasize the sense of rhythm, thereby enhancing the bass range in the reproduced sound. It is
an object of the present invention to provide an on-vehicle acoustic device which gives a listener
a sense of wideness by making the dynamic range in the high range of the reproduced sound
from the rear speaker.
[Means for Solving the Problems] In order to achieve the above object, according to one aspect of
the present invention, there is provided a low-pass signal extracting means and a high-pass signal
passing each of the low-pass side and the high-pass side signal among Signal extraction means
and first and second gate circuits for passing the low band signal and the high band signal when
the low band signal and the high band signal passed by one exceed a predetermined level; The
low-pass signal and the high-pass signal passing through the gate circuit are added to the signal
from the sound reproducing apparatus and supplied to the front and rear speakers, respectively.
[Operation] According to the present invention, the low band side signal of the audio signal from
the sound reproduction apparatus is extracted, and when the signal becomes a predetermined
level or more, this signal is added to the normal sound reproduction signal, Because it is supplied
to a pair of front speakers arranged, the sharpness and rhythmic feeling of the bass range in the
reproduced music are emphasized, and a crisp and crisp reproduction is possible without the
bass range being full. Also, the high band side signal of the audio signal from the sound
reproducing apparatus is extracted, and when the signal becomes a predetermined level or more,
this signal is added to the normal sound reproduction signal and arranged at the rear of the
vehicle compartment The output of the high range from the rear speaker is increased compared
to the front speaker when the music source contains a large level of the high range to supply to
the pair of rear speakers, and the high range for the listener The movement of the sound image
in the forward and backward direction of the image takes place, and a feeling of spatial spread is
obtained. Embodiments of the present invention will be described in detail with reference to the
drawings. FIG. 1 shows a block diagram of an embodiment of the vehicle-mounted acoustic
device according to the present invention, wherein 1 is an audio reproducing device such as a CD
player, radio or cassette deck, 2 is a low pass filter with a cutoff frequency of about 500. , 3 is a
bypass filter having a cutoff frequency of 3 k Tz, 4 and S are gate circuits, 6 to 9 are attenuators,
10 to 13 are addition circuits, 14 to 17 are amplifiers, 18 and 19 are front speakers (shown
Reference numerals 20 and 21 denote output terminals to a rear speaker (not shown). In the
figure, each of the audio signals L ch and R ch output from the sound reproducing apparatus 1 is
branched into two, one of which is passed through the low pass filter 2, and only its bass range
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component is sent to the gate circuit 4. The second @ is a block diagram showing an example of a
specific configuration of the gate circuit 4. 41 is an adder circuit, 42 is a level detector, 43 is an
arbitrary level setting volume, and 44 is a switch circuit.
As shown in FIG. 2, the signals L ch and R ch from the low pass filter circuit 2 are branched into
two again, one of which is added by the adding circuit 41 and sent to the level detector 42. In
this level calibration unit 42, when this addition signal becomes equal to or higher than the level
set in the setting volume 43, the switch circuit 44 is operated, and the audio signal Lch inputted
to the switch circuit 44. Output Rch. The output signal of the gate circuit 4 is dropped by about 3
dB by the 7 sonetator 6.7 compared with before the input of the low pass filter 2 and added to
the audio signal from the sound reproducing device 1 by the adder circuits 10 and 11 and
amplified by the amplifiers 14 and 15 , And then supplied from the output terminals 18 and 19
to the front speakers. On the other hand, the other of the audio signals Lch and Rch from the
sound reproduction device 1 is passed through the bypass filter 3, and only the high range
component is sent to the gate circuit 5. As in the case of the gate circuit 4, the gate circuit 5
outputs the input signal as it is when the input signals L ch and Rah reach the set level or more.
The output signal of the gate circuit 5 is dropped by about 5 dB by the attenuators 8 and 9,
added to the audio signal from the sound reproducing apparatus 1 by the addition circuits 12
and 13, amplified by the amplifiers 16 and 17, and then output terminals 20 and 21. To the rear
speakers. FIG. 3 is a waveform diagram for explaining the operation of FIGS. 1 and 2. As shown in
FIG. 3 (a), in gate circuits 4 and 5, any level at which the level of the addition signal is As a result,
an input signal as shown in FIG. 3 (b) is outputted as a signal as shown in FIG. 3 (c). In addition,
the user can freely set the arbitrary levels described above in accordance with the music source.
Moreover, in the example mentioned above, although cut-off frequency was about 500 Hz and 3
kHz, it is not limited to it. As described above, according to the present invention, the following
effects can be achieved. (1) When the low frequency side of the normal playback signal exceeds
the setting level, the low frequency side signal is added to the playback signal, so the sharpness
of the low frequency range in the playback music and the sense of rhythm are emphasized and
the low frequency range is full It is possible to make good reproduction without any trouble. (2)
When the high frequency side of the normal playback signal exceeds the setting level, the high
frequency side signal is added to the playback signal, so if the music source contains a large
treble level, the front speaker In comparison, since the output of the high range from the rear
speaker is increased, movement of the sound image in the front-rear direction of the high range
occurs to the listener, and a feeling of spatial spread can be obtained.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a block diagram of an embodiment of a vehicle-mounted acoustic device according to
the present invention, FIG. 2 is a block diagram of an example of the gate circuit of FIG. 1, and
FIG. 3 explains the operation of FIGS. FIG. 4 is a diagram showing an example of engine noise.
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· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Gate circuit, 10 to 13...
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