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The present invention uses a center speaker to correct the asymmetry of stereo broadcasting? di
regular dress In a car stereo reproducing apparatus, it is general that the listening point is in
relation to the seat position, and is asymmetrical with respect to the R2 reproduction speakers.
For example, when the driver's seat and the passenger's seat each become listening points, two
speakers are usually installed at a position symmetrical with respect to the center position, so
that mechanically speaking both listening points have two speakers It will be in an asymmetric
position. When listening to 2-channel stereo broadcasting at such an asymmetrical position, it is
electrically different by giving a volume difference to two speakers if it is limited to one of the
channels (for example, the driver's seat) or by delaying one channel. The asymmetry can be
corrected. However, this further promotes the asymmetry of the other listening point. According
to the present invention, by arranging a center speaker in the middle of the R2 speakers and
devising a method for reproducing L + R signals by this center speaker, it is possible to listen to a
stereo broadcast having symmetry at two listening points. It is According to the present
invention, the center speaker is disposed between the L channel speaker for reproducing L signal
and the R channel speaker for reproducing R signal, and the (L + R) signal obtained by combining
L signal and R signal is delayed and the volume Forming two listening points of stereo
broadcasting having symmetry between the center speaker and the L channel speaker and
between the center speaker and the R channel speaker by reproducing the corrected signal by
the center speaker. This will be described in detail with reference to the illustrated embodiment
below. FIG. 1 is an explanatory view of a stereo sound field in a vehicle cabin, where SPi and SF3
are normal (left) and R (right) signal reproduction speakers. In the case of stereo listening at an
asymmetrical position such as the driver's seat and the passenger's seat in this system, sound
field correction has conventionally been considered for the driver's seat only or the passenger's
seat only. For example, in order to add sound field correction to the driver's side, the signal input
to the speaker SP2 is delayed to apparently put the speaker SP2 backward, and the time
difference and level difference from the speaker SPI and the SF3 are eliminated. However, in this
case, when viewed from the front passenger side, both the time difference and the level
difference are larger than the relationship between SPI and SF3 of the original asymmetric
position, and good stereo listening can not be expected at all. Therefore, in the present invention,
a method of correcting both seats simultaneously is considered. Conventionally, it has been
known that the time and intensity exchange action (time-1 ntenstty trading) of both ears is
known, and in the experiment using two speakers of L and R, it is possible to correct the
difference in intensity by the time difference.
Therefore, paying attention to that point, the center speaker SP3 is placed between the sumi
force SPI and SP2, a signal of L + H is added to this, and delay is applied to correct the volume.
FIG. 2 shows an embodiment of the present invention based on the above findings. AMP I ′ ′
AMP 3 is a power amplifier for the speakers SP1 to SP3, DLY is a delay circuit for delaying a
signal given to the center speaker SP3 by time τ, ATT is its Attenuator that attenuates the
output level (volume correction) MIX is a mixer that mixes the left signal Lin and right signal Rin
and gives it to the delay circuit DLY. DI and C2 prevent reverse routing of the signals Rin and Lin
to the opposite side. Diode. Consider the sound field correction of the left asymmetric position
(closer to SPI) in the above system. In FIG. 3 (al is a case where a signal L (e) for the L channel is
added to the L channel, but at this time the speaker SPI is e, and the sound of e from SF3 with
delay and volume correction added thereto. Out. Since e 'is delayed by a time difference τ
compared to e, the sound sounds close to SPI. FIG. 3b) does not hear sound from the speaker SPI
because there is a diode R2 at this time (in the case where the signal D is added to the R channel
((when the resistance is added, the sound is heard only from the speaker SP3). Therefore, the
sound sounds close to SF3. FIG. 3 (C1 shows a case where a signal of e is added to both R
channels, but at this time, a sound of e is produced from the speaker SPI. Also, the signal of 2 e is
added to S I) 3 in the previous stage to which delay is applied, but if delay is applied and sound
volume correction is performed, the sound is apparently localized between SPI and SF 3.
Therefore, the sound field at this asymmetrical position can be corrected. The same applies to the
opposite side (closer to SF3). That is, in FIG. 3 + a +, the sound of the sound source located on the
left side of the listener is heard offset to the left speaker SPI, and the sound of the sound source
located on the right side of the listener is heard from the right speaker SP3 side. Further, (C1
indicates that the sound of the sound source facing the listener is heard equally from the left and
right side speakers SPI, SP3 and hence at the middle portion thereof. This enables good stereo
listening. In the case of (b) and (C), the sound is also emitted from the speaker SP2, but since the
position is far, it can be ignored. If you don't ignore it, use it as part of the sound to the right. The
same applies to the right listening point (for example, the driver's seat). Therefore, it is possible
to listen to a stereo broadcast having symmetry at the two listening points shown in FIG.
FIG. 4 is a specific example of FIG. 2; buffer amplifier for the BUFI, BUF2 HaLin, Rin input, L out.
Rou, t passes through the buffer amplifier, each signal of H, R1, R2 composes the mixer MIX to
obtain L + R signal, BUF3 and the CR circuit around it pass low-pass filter to pass only audible
sound LPF + consists of BASFOO, AMP, BUFa. The buffer amplifiers BUFa and the CR circuits
around them and the similar low-pass filter LPF 2 are also used, and the BBD1 and BBD2 are the
delay circuits described above, and the HAKE Soto Bricate devices forming LY. Attenuator ATT is
a variable resistance, that! It is possible to take out the signal CENout of H motion y ++, l to L + R.
As described above, according to the present invention, since the center speaker for delaying the
L + R signal and performing volume correction and reproducing is provided between the L and R
two speakers, between the center speaker and the L-side speaker, There is an advantage that it is
possible to form two listening points which can listen to symmetrical stereo broadcasts
respectively between the left and right speakers.
Brief description of the drawings
1 is an explanatory view of a stereo sound field, FIG. 2 is a block diagram showing an
embodiment of the present invention, FIG. 3 is an operation explanatory view thereof, and FIG. 4
is a circuit diagram showing a concrete example.
In the figure, SPI is an L channel speaker, SF3 is an R channel speaker, SF3 is a center speaker,
MIX is a mixer, DLY is a delay circuit, and ATT is an attenuator. Applicants Attorney Attorney
Atsushi Aoyanagi
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