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JPH0383492

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DESCRIPTION JPH0383492
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
car audio apparatus capable of realizing good sound image localization, stereo feeling and
wideness feeling in the interior of a car. 2. Related Art Conventionally, technological
developments such as speaker arrangement and audio signal processing for realizing a sense of
sound localization as in home audio and stereo feeling in a car audio apparatus have been made.
(For example, see JP-B-67-202200 and JP-B-63-173500. A problem to be solved by the
invention: In the conventional car audio apparatus, the speaker arrangement as viewed from each
seat serving as a listening point is uninteresting, and the sound image is localized at a biased
position. Furthermore, since the mounting position of the speaker is biased to the rear or lower
part of the vehicle interior, the sound is heard from the rear or lower part and the naturalness is
lost. In order to improve this, some have placed a center speaker in the center of the front of the
vehicle interior, but since the signal is supplied to the center speaker by adding the audio signal
of both left and right channels, the sense of stereo is impaired Had the problem of ! In addition,
an auxiliary speaker is disposed at the left and right of the center of the vehicle interior or at the
rear, and an audio signal with delay processing added to this is supplied to try to realize a sense
of space expansion. Had the problem of causing Furthermore, it was a fact that measures were
not taken against the problem that sound was heard from the back or the lower part. In view of
the above problems, the present invention provides a natural sound image localization feeling
and stereo feeling in the rear left and right seats as well as a natural sound image localization
feeling and stereo feeling in the front left and right seats in a button in the vehicle compartment.
The present invention provides a car audio device that can Means for Solving the Problems In
order to solve the above problems, the car audio apparatus of the present invention arranges the
speakers for middle and high-pitched sound reproduction of the main speaker system in the
front, rear, left and right at a high position in the vehicle interior Place the center speakers for
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the front right seat, front left seat, rear right seat, and rear left seat near the center of the car and
near the center of the cabin, and for each seat at the rear end of each door It has a configuration
in which side speakers are arranged. Further, the input signal to the center and side speakers can
be added with a transcoding circuit, and has a circuit configuration capable of performing phase
correction to the main speaker system. According to the configuration described above, for the
front right seat, the main speaker system disposed on the front right in the front of the passenger
compartment and the side speakers at the rear end of the front right door transmit the right
channel audio signal to the front of the passenger compartment. The left channel audio signal is
reproduced from the main speaker system disposed on the left side of the and the center speaker
installed toward the front right seat near the center of the front of the vehicle interior.
For the front left seat, the main speaker system disposed on the left front of the vehicle interior
and the left channel audio signal from the side speaker at the rear end of the front left door are
disposed on the right front of the vehicle interior The right channel 1 audio signal is reproduced
from a center speaker installed toward the front left seat near the center in front of the
passenger compartment. Also, for the rear right seat, a rear main speaker system in which the
right main channel audio signal from the rear main speaker system disposed on the right in the
middle of the vehicle interior and the rear side speaker at the rear end of the rear right door is
arranged on the left in the middle of the vehicle interior The left channel audio signal is
reproduced from a rear center speaker installed toward the rear right seat near the center of the
system and in the middle of the passenger compartment. For the rear left seat, the left channel
audio signal from the rear main speaker system disposed on the left in the middle of the vehicle
interior and the rear side speaker at the rear end of the rear left door is disposed on the right in
the middle of the vehicle interior. The right channel audio signal is reproduced from the IJ Amain
speaker system and the rear center speaker installed toward the rear left seat near the center of
the middle of the vehicle interior, without loss of stereo feeling in all four seats in the vehicle
interior The sound image can be localized at the center of the front of the seat. The signals
supplied to the front and back center and side speakers in the above-mentioned speaker system
can be incorporated with a transcoding circuit so that the amount of phase change of the input
signals to the buttons and the speakers can be adjusted. It becomes possible to divide the sound
source evenly to the left and right for each seat, and it is possible to provide a natural stereo
feeling and wideness that does not make the glass on the side of the vehicle interior conscious.
Embodiment A car audio apparatus according to an embodiment of the present invention will be
described with reference to the drawings. FIG. 1 shows the arrangement of speakers in a vehicle
cabin of a power-audio apparatus according to an embodiment of the present invention, and FIG.
2 is a perspective view of the right side thereof. In FIG. 1, 1 is a front right seat, 2 is a front left
seat, and 3 is a rear seat. The reference numeral 4.6 denotes a main speaker for the right channel
and a main speaker for the left channel disposed on the left and right of the front of the vehicle
interior, respectively. 6.7 and 8.9 are a mid-range speaker for the right channel, a high-range
speaker, a mid-range speaker for the left channel, and a high-range speaker, which are attached
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to, for example, the upper end of the dash board or the front pillar. A front right seat center
speaker 1o is disposed near the center of the front of the vehicle interior and is attached to, for
example, a dashboard of a car at an angle directed to the front right seat 1.
A front left seat center speaker 11 is disposed near the center of the front of the vehicle interior
and is attached to, for example, a dashboard of a car at an angle directed to the front left seat 2.
Reference numeral 12 denotes a front right seat side speaker installed toward the side of the
front right seat 1, for example, attached to the upper end of the front seat right door. Reference
numeral 13 denotes a front left seat side speaker installed toward the side of the front left seat 2,
for example, attached to the upper end of the front seat left door. 14.15 are main speakers for
the right channel and main speakers for the left channel installed at the left and right,
respectively, in the middle of the vehicle interior, and attached to the front lower ends of the left
and right doors for the rear seats, for example. 16.17 are speakers for high-pitched sound
reproduction of the rear main speaker system, and are installed, for example, on the center pillar
toward the rear right seat and the rear left seat. Reference numeral 18 denotes a rear left seat
center speaker installed toward the rear right seat near the center of the middle of the vehicle
room, and is mounted, for example, in the center of the ceiling. Reference numeral 19 denotes a
rear left side seat center speaker installed toward the rear left seat near the center of the middle
of the vehicle room, and is mounted, for example, in the central portion of the ceiling. Reference
numeral 2o denotes a rear left seat side speaker installed toward the right side surface of the
rear seat 3, for example, attached to the upper end of the rear seat right door. Reference numeral
21 denotes a rear left side speaker installed at the side of the rear seat 3, for example, attached
to the upper end of the rear left door. FIG. 3 shows a system diagram for the front seat in one
embodiment, and in FIG. 3, 22 is a signal source such as CD, deck, etc., and the right channel
signal is divided into three paths for speakers Supplied to One of them is from the amplifier 23
for the main speaker system through the band dividing circuit 24 to the right channel main
speaker 4, the middle sound speaker 6 and the high sound speaker 7, and the other one is from
the high pass filter 25 to the transposition circuit 26. The signal is supplied to the front left seat
center speaker 11 via the amplifier 27, and the other one is supplied from the high pass filter 28
to the transposition circuit 29 and the front right seat side speaker 12 via the amplifier 3o. . The
left channel signal is also supplied to the left channel speaker through the same path as above,
31 is an amplifier, 32 is a band dividing circuit, 33 is a high pass filter, 34 is a transposition
circuit, 35 is an amplifier, 36 is high. A band pass filter, 37 is a transposition circuit, and 38 is an
amplifier. FIG. 6 shows a system diagram for the rear seat in the same embodiment. In FIG. 6, 22
is a signal source such as CD, deckle etc. The right channel signal is divided into three paths and
supplied to the speaker One of them is from the amplifier 39 for the rear main speaker system
through the band dividing circuit 40 to the rear right channel / remaining speaker 14 and the
high sound speaker 16, and the other one is from the high pass filter 41 to the transposition
circuit 42. The other one is supplied from the high pass filter 44 to the transposition circuit 45
and the amplifier 46 to the rear left seat side speaker 20 through the amplifier 43 and the rear
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left seat center speaker 19 respectively.
The left channel signal is also supplied to the left channel speaker through the same path as
described above, 47 is an amplifier, 48 is a band dividing circuit, 49 is a high pass filter, 60 is a
transposition circuit, 61 is an amplifier, 52 is high. Reference numeral 53 denotes a transposition
circuit, and 64 denotes an amplifier. The operation of the front right seat will be described with
reference to FIGS. 3 and 4 for the car audio apparatus configured as described above. One of the
right channel signals output from the signal source 22 is supplied from the amplifier 23 through
the band dividing circuit 24 to the main speaker system 4.6.7 to reach the front right seat 1.
Further, it is supplied from the band division filter 28 to the speaker 12 through the
transposition circuit 29 and the amplifier 3 o to reach the seat 1. The right channel signal in the
front right seat 1 is reproduced from the two speakers. The audio signals arriving from two
points different in distance and angle from the listening point include a phase difference and the
unnatural sound field is reproduced. However, by adjusting the amount of phase change in the
transposition circuit 29, it is possible to form the virtual sound source 66 stably with the right
channel 7. Also, one of the left channel signals output from the signal source 22 is supplied from
the amplifier 31 through the band dividing circuit 32 to the main speaker system 5.8.9 to reach
the front right seat 1. Further, it is supplied from the band dividing filter 33 through the
transposition circuit 34 and the amplifier 36 to the speaker 1 o to reach the front right seat 1.
The left channel signal in the front right seat 1 is reproduced from the two speakers, and the left
channel virtual signal is adjusted as in the case of the right channel signal to adjust the phase
change amount in the transposition circuit 34. The sound source 66 can be stably supplied. Next,
the operation of the car audio apparatus of the present configuration in the rear left seat will be
described with reference to FIGS. One of the right channel signals output from the signal source
22 is supplied from the amplifier 39 through the band dividing circuit 40 to the speaker 14.16
and reaches the left side of the rear seat 3 which is the listening point. Further, the signal is
supplied from the high pass filter 41 through the transposition circuit 42 and the amplifier 43 to
the speaker 19 to reach the listening point. The right channel signal in the left seat of the rear
seat 3 is reproduced from the two speakers. The audio signals arriving at two points different in
distance and angle from the listening point contain a phase difference, and an unnatural sound
field will be reproduced. However, by adjusting the amount of phase change in the transposition
circuit 42, it is possible to form the right channel virtual sound source 57 stably.
Further, one of the left channel signals output from the signal source 22 is supplied from the
amplifier 47 through the band dividing circuit 48 to the rear main speaker system 15.17 to
reach the left listening point of the rear seat 3. Further, it is supplied from the high pass filter 52
through the transposition circuit 63 and the amplifier 64 to the speaker 21 and reaches the left
listening point of the rear seat 3. The left channel signal on the left side of the rear seat 3 is
reproduced from the two speakers, and the left channel virtual sound source is adjusted by
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adjusting the amount of phase change in the transposition circuit 63 as in the case of the right
channel signal. 68 can be supplied stably. The left and right virtual sound sources can be stably
provided in the same manner as described above for the right side of the front left seat 2 and the
rear seat 3 as well. Effects of the Invention As described above, the car audio device according to
the present invention is, for the front right seat, a main speaker system disposed on the right
front of the vehicle interior and a side speaker from the side speaker at the rear end of the front
right door The left channel audio signal is reproduced from the main speaker system located on
the left side in front of the vehicle interior and the center speaker installed toward the front right
seat near the center on the front side of the vehicle interior, In other words, the main speaker
system located on the left side in front of the vehicle compartment and the left channel audio
signal from the side speaker at the rear end of the front left door, the main speaker system
located on the right side in front of the vehicle interior The right channel audio signal is
reproduced from the center speaker installed near the front left seat in the vicinity, and the
center - by adjusting the amount of phase change in Utsuriwa circuit provided in the signal
system to the side speakers it is possible to localize a sound image in the front center of each seat
without impairing the stereo. Furthermore, by adjusting the phase change amount, it is possible
to divide the virtual sound source equally to the left and right with respect to each seat, and to
provide a natural stereo feeling and wideness b not to be aware of the glass on the side of the
vehicle interior. Is possible. ! For the rear right seat, the rear main speaker system disposed on
the right in the middle of the vehicle compartment and the rear channel speaker from the rear
side speaker at the rear end of the rear right door are disposed on the left in the middle of the
vehicle interior The left channel audio signal is reproduced from the rear center speaker installed
toward the rear right seat near the center of the middle of the vehicle system and the speaker
system. For the rear left seat, a rear main speaker system in which a left main channel audio
signal from the rear main speaker system disposed on the left in the middle of the vehicle
interior and the rear side speaker at the rear end of the rear left door is disposed on the right in
the middle of the vehicle interior And the right channel audio signal of the rear center speaker
installed toward the rear left seat near the center of the middle of the vehicle interior is
reproduced, and the amount of phase change in the transposition circuit provided in the signal
system to the center side speaker The adjustment allows the sound image to be localized at the
front center of each seat without losing the sense of stereo.
Furthermore, as with all seats, by adjusting the phase change amount, it is possible to shake the
virtual sound source evenly to the left and right with respect to each seat. It becomes possible to
provide a feeling.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a schematic view showing a speaker arrangement of a car audio apparatus in a vehicle
compartment according to an embodiment of the present invention, FIG. 2 is a perspective view
of a right portion thereof, and FIG. 3 is a front seat for the same embodiment. Fig. 4 is an
explanatory diagram for explaining the virtual sound source in the front right seat, Fig. 5 is a
system diagram for the rear seat in the embodiment, and Fig. 6 is an explanatory drawing for the
virtual sound source in the rear left seat FIG.
1 ...... right front seat, 2 ...... front left seat, 3 ...... rear seats, 4 ...... right channel main speaker, 6 ...
.... the main speaker for the left channel, 6 ...... right channel midrange speaker, 7 ...... left channel
midrange speaker, 8 ...... right channel treble speaker , 9 ...... left channel l and treble for speaker,
10 ...... front right seat for the center speaker, 11 ... mountain-front right seat for the center
speaker, 12 ..... - the front right seat side speakers, 13 ...... front right seat side speakers, 14 ......
rear right channel main speaker, Mein'nupika for 16 ...... rear left channel и и и и и и и и и и и и и и и и и и и и и и
Rear right channel treble speaker 17 ... rear left channel treble for speaker, 18 ...... rear right seat
for the center speaker, 19 ... rear right seat for the center speaker, 2o ииииии rear right seat side
speaker, 21 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Signal source,
23.27. ????????????????????? 47.51. 54 ииииииии Amplifier, band splitter for
24.32 иии, 25.2 B, 33.36.144.49.52 иииииииииииииииииии High pass filter, 26? 29.34.37.42.45.50.53
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии For the front right seat right channel virtual sound
source, 56 ...... front right seat of the left channel virtual sound source, 67 ...... rear left seat right
channel virtual sound source, 58 ...... left of the rear left seat Channel virtual sound source.
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