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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an on-vehicle acoustic
signal amplifier according to the present invention, FIG. 2 is a block diagram showing another
embodiment of the present invention, and FIG. FIG. 6 is a circuit diagram of a mixing amplifier to
be 1.5: stereo signal input terminals 2, 6 and 11: first to third volume adjusters 3, 7, and 12: first
to third power amplifier circuits, 4, 8 and 13 ... first to third speakers, 10 ... mixed amplifier.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to an acoustic signal
amplifier for a vehicle, and more specifically, a left side) e stone fR) a stereo signal of each
channel is reproduced so as to obtain a sense of presence by a 3-speaker system The present
invention relates to an on-vehicle acoustic signal amplifier. In the past, as a single-mounted 2channel playback device, it was common to separately reproduce the acoustic signals of L and R
channels individually through two speakers arranged at the left and right positions of the rear
barrel tray in the vehicle compartment. It is However, this conventional device has a
disadvantage that a large difference in sound pressure level occurs between the front seat and
the rear seat in the vehicle compartment, and the sound effect differs depending on the seat
position & of the listener. On the other hand, recently, 7 front? -P and power G) Played with four
speakers placed at the left and right positions respectively, to give listeners a sense of presence
(like an atmosphere) in a concert hall. Le-regeneration devices have been proposed and adopted
in automobiles. However, when i adopt this in a car, the number of speakers placed in front will
be a big problem 2, in this case each speaker will take the driver's seat in this case It must be
installed, and some vehicles do not have enough space for installation and some can not be
installed. In addition to the speakers corresponding to the left and right channels, a third speaker
is provided which combines and reproduces the signals of both channels and reproduced, and an
apparatus for reproducing a stereo signal using these three speakers is basically already II. !
Although applied to cars, there are still many difficulties in creating an optimum sense of
presence at each seat position in a vehicle cabin having front and rear seats. Therefore, the
present invention reproduces stereo signals of left and right channels in a single room having
front and rear seats so as to take a plurality of seats so that an optimum sense of reality can be
obtained with ninety three speakers. It is an object of the present invention to provide a novel onvehicle reverberation signal amplifier for a vehicle. In brief, the present invention is arranged in a
vehicle interior having a front and a rear seat and at the left and right positions of the single
room. The first and second amplification circuits are provided to separately supply stereo signals
of left and right channels to the ninety-two speakers, and each one speaker disposed in front of
each other A third amplifier circuit provided to supply a composite signal of the left and right
channels, and including a third volume adjustment means, wherein the three speakers surround
the plurality of seats Thus, according to the volume of the first and second amplifier circuits at
the time of stereo reproduction, the volume of the third amplifier circuit can be adjusted to create
a powerful acoustic effect at each seat position Hereinafter, the embodiment of the present
invention will be described in detail with reference to the drawing. (FIG. 1 is a block system
diagram showing this projection -5 = J "-, the stereo signal input terminals 1 and 5 have variable
resistors 2 for adjusting the volume of the L channel (1) at Ill. And the first amplifier circuit
consisting of the power amplifier circuit 3 and is arranged at the left position of the mans bar cell
tray in the car, and is connected to the speaker 4 VC of @@ l or 9 R channel “5) or the second
volume @ phasing Town?
A second speaker circuit Vc connected to the right of the tS bar cell tray through a second
booster circuit consisting of a resistor 6 and a power amplifier fc + j & @ 7, and a series T #
between the stereo signal input terminals 1 ° 5. A variable resistor 9 is inserted for balancing
the signal input to the D first and second variable resistors 2 °. Furthermore, the stereo signal
input terminals 1 and 5 are disposed under the front Barceltoni or Dansch board through a third
amplification circuit for synthesizing and amplifying both L and R channel signals. It is linked to
13. The third amplifier circuit comprises a mixing amplifier 10 coupled to both L-1 channels to
amplify and output the combined signal, a third volume adjustment iT variable low resistance 11
and a third power amplifier circuit 12 It is composed of: Said mixed amplification 410! -I% As
shown in FIG. 3, L · R channel combination φ 101, 102, a pair of transistors 103, 104 for each of
the terminals 101, 102, load resistances LO 5, 106, a storage capacitor IC! It comprises 79108
and an output terminal 109 connected to the variable resistor 11. Here, it goes without saying
that the mixing amplifier 10 is configured not to reduce the portion 11 [− between L−R
channels, and (the voltage gain of the third power boosting Iii circuit is It has been
experimentally found that about 10 dE can be obtained with the same standard. Is determined by
the gain of the third amplification circuit required to increase the volume lj # ll of the third
speaker 3 to produce an optimum acoustic field, where these listeners are located at the rear
seat. Therefore, in the above configuration 5i, VC, variable resistors 2 and 6 for the 12th and
second volume M% and the third variable resistor 11 for volume adjustment are completely
independent of # adjustment. Form. On the other hand, Fig. 2 is 11! FIG. 17 is a block diagram
showing a block diagram in which the third amplification circuit is indirectly connected to the
stereo input terminal 1.5 via the first and vJ2 amplification circuits in the modification of FIG. .
The bite ICs 11, 102 for R channel coupling are connected to the output stages of the first and
second volume control variable resistors 2 and 6, respectively. Therefore, in this configuration,
the volume of the third amplifier circuit is arbitrarily adjusted depending on the volumes of the
first and @ 2 amplifier circuits. Here, it is convenient to operate the volume 'IIa11 so that not
only the listeners in the front seat but also the loser of the rear cloth can be operated remotely.
Now, the operation of the in-vehicle acoustic signal amplifier according to the present invention
will be described. That is, now, the volume of the first and second amplifier circuits is at an
appropriate position and the volume of the third amplifier circuit is at zero value. If the stereo
signal is input to the stereo signal input dialer 1.5, the L-R channel signals are individually
amplified by the first and second amplification circuits, and the first and second As in the prior
art, stereo reproduction is performed from the speaker of
Here, assuming that the listener is, for example, in the front seat, when the volume is slowly
increased by controlling the variable resistor 11 of the third amplification circuit, the ones that
had been stereo reproduction up to this time are arranged in a curved portion As the volume of
the speaker 13 of the speaker 13 is sequentially increased, the rear sound source spreads in the
forward direction sequentially, and when it reaches a certain point, it seems as if these sound
sources are one sound source, and the entire single direction is a concert It becomes an acoustic
field (4 atmosphere) such as a hall. Furthermore, when the volume of the front-located speaker is
increased, the volume of the speaker is prioritized, and the sense shifts to seven aural sense. Also,
if the ah person is, for example, in the rear seat VC, the volume resistance of the third amplifier
circuit is controlled by increasing the volume of the third speaker 13 in the same manner as
described above. The same phenomenon (sound effect) as described above can be obtained. Thus,
by setting the volume of the third speaker in the front arrangement to a certain value VC, the
volume of the first and second speakers in the rear arrangement is set extremely. A suitable
acoustic field can be created, but in this case, the volume relationship between the front speaker
and the rear speaker with respect to the listener's seat position is that the volume of the 1If J
section speaker is greater than the volume of the rear speaker at lIO seat priority. At the time of
small rear seat priority, the volume of the front speakers is in a larger relationship than the
volume of the rear speakers. As apparent from the above-mentioned town, this device adds one
speaker to the conventional two-speaker system, arranges the additional speaker at the front, and
synthesizes the signals of the left and right channels. The third amplifier circuit is connected to a
third amplifier circuit for amplification, and the third amplifier circuit can independently adjust
the volume of the first and second amplifier circuits for rounding in stereo reproduction. The
listener's position and the speaker attachment are extremely effective when applied to an onvehicle acoustic apparatus that is greatly restricted by the position and the like, since the
presence as if in a hall can be obtained. In particular, when this is applied to an FM multiplex
stereo communication device, it is effective in eliminating unnaturalness when it is automatically
transferred from stereo broadcasting to seven aural broadcasting and vice versa. By the way, in a
car equipped with both AM radio receiver and stereo tape player device in the past, there are
also some that have installed three dedicated speakers for Eleven and selectively switched and
used. In the case of (9), by adding only the third amplification circuit, a sense of realism can be
obtained, which is very economical. Further, as shown in FIG. 3, a balance adjustment resistance
resistor 20 is inserted in the mixing amplifier 10 to change the mixing ratio of the third power
and the synthesis signal of the L-R channel input to the amplification circuit 12 by a factor of It is
also possible to create all the various acoustic fields by supplying different signals t- of the same
wave number and phase に to each amplification circuit. Of course, the acoustic signal amplifier
of this invention is applicable not only to the above-described in-vehicle use but also to general
household use.
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