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JPS59107700

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DESCRIPTION JPS59107700
[0001]
The present invention relates to an on-vehicle acoustic reproduction device used in a vehicle
compartment of a vehicle, and provides an on-vehicle acoustic reproduction device with a simple
circuit configuration that can obtain a sense of spread even when listening in a narrow vehicle
interior. Hereinafter, an embodiment of the present invention will be described with reference to
the drawings. FIG. 1 shows an outline of a cabin of a car. The speakers 2 and 3 are disposed on
the left and right of the front of the cabin 1, and the speakers 4 and 6 are also disposed on the
left and right of the rear. 6 is a driver (listener), L. R is the left and right ears of the listener 6, and
the listener 6 listens to the sound radiated from the speaker 2.3.4.5. 7A and 7B are electric
circuits, and two-channel signals 42. r is applied to the speakers 2 and 3 and the speaker 4.6 via
the two electric circuits 7A and 7B. FIG. 2 shows a circuit for making it feel as if it were emitted
from the speaker arranged at point P while listening to the sound emitted from the speakers 2
and 3. In FIG. 2, H1R2H1L is the transfer function between the speaker 3 and the listener 6 on
the left and right, transfer function between R, H2R2H2L is the transfer function between the
speaker 2 and the listener 6 on the left and right, transfer function between R and HφR2HφL to
the point P Arrange the speakers 3 Beko! This speaker and the left and right ears of the listener 6
when you The transfer function between R, radiated from the speakers 2 and 3, through the
transfer function HIRIHILIH2RIH2L, the left and right ears of the listener 6, the sound pressure
of -tj to R, and the spies y arranged at the point P1, 1: Emitted transfer functions H, t, L. If the
sound pressure given to the left and right of the listener 6 through H, t, R is equal to the sound
pressure given to H, do not listen to the sound radiated from the speakers 2, 3 l) The conception
person 6 starts from the point P It feels as if it is listening to the sound of V. It can be achieved
by connecting the circuit block shown in FIG. 2 to the front stage of the speaker 2.3. 8i1 is a
delay (b) path for correcting the difference in distance between the speakers 2 and 3 and the
listener 6. According to the inventor's experiment ": It was found that the above effect can be
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obtained by the circuit block in FIG. As described above, in connecting the circuit block and the
delay circuit 8 to the front stage of the speakers 2 and 3, ": hear the sound from the listener 6d
and the point P while listening to the sound radiated from the speaker 2.3 Yes J: It is something
that can make you feel uneasy. The present invention is based on the above principle, and one
embodiment of the present invention will be described below with reference to FIG. In FIG. 3, 8 is
the delay circuit, 9 is an iser, 11 is an adder, and the left and right channel signals added by the
adder 11 are added with reverberation by a reverberation adding circuit 12 including a delay
element such as BBD. .
This reverberation signal is added to the right channel signal r and the left channel signal l in
adders 13.14, respectively. The signal added by the adder 14 is divided into two through the
equalizer 1 o, and one of the signals is applied to the speaker 3 through the delay circuit 8 and
the amplifier 6 page 16. The output of the equalizer 10 is added to the output of the adder 13 by
the adder 17 through the equalizer 9 and is applied to the speaker 2 through the amplifier 15.
When two channel signals r and l are applied to the speakers 2 and 3 through the electric circuit
7A shown in FIG. 3, the speaker 3 is moved to the point P in FIG. The same listening condition
can be obtained, and a feeling of spread can be obtained even in a narrow room. In particular, in
the present example, since the reverberation signal also passes through the equalizers 9 and 1 o,
the reverberation is also radiated from the direction of the point P and the direction of the
speaker 2, and the sense of spread is further increased. The electric circuit 7B in FIG. 1 has the
same configuration as the circuit 7A, and when the left and right channel signals r and l are
applied to the speakers 4 and 6 through the electric circuit 7B, the listener 6 sets the speaker 5
at point Q. The same effect as moving is obtained. As described above, since the equalizer for
converting the transfer function between the speaker and the listener into the transfer function
between the speaker and the listener is provided in this embodiment, this is equivalent to
widening the speaker interval. Also, since the two-channel signal and the reverberation signal are
radiated from the speaker via the equalizer, a wide sense can be obtained. As described above,
according to the present invention, an effect equivalent to that of widening the speaker interval
can be obtained, and a sense of wideness can be obtained even when listening in a narrow
vehicle interior. Because the light is emitted from the speaker, the spreading effect has a great
advantage.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a schematic view of a vehicle-mounted sound reproducing apparatus according to an
embodiment of the present invention, FIG. 2 is a block diagram of the main part of the apparatus,
and FIG. 3 is a block diagram of the apparatus.
1 · · · Vehicle compartment, 2, 3, 4.5 · · · · · · · · Speaker · · · · · · · · · listeners, L · R · · · · · · · · Ear, 7A,
7B · · · ... · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · 13 7-14 Adder, 15.16 Amplifier, 17 Adder. Name of agent Attorney Nakao Toshio Other 1
person Figure 1 Figure 1 ˜
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