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JPS53116102

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DESCRIPTION JPS53116102
Description 1, title of the invention
Sound reproduction device
3. Detailed Description of the Invention The present invention relates to a sound reproduction
apparatus for listening in a relatively narrow room such as the interior of a car. FIG. 1 shows a
conventional audio reproducing apparatus for a car, 1 is a car, 2 and 3 are front and back seats
respectively disposed in the room of the car 10, and 4 and 4 'are on the back of the back seat 3.
Speakers placed, 5) are noodles. When stereo signals of 2 channels are applied to the speakers 4
and 4 'shown in FIG. 1 and listened in the vehicle compartment, the sound field is limited to the
range A indicated by the broken line, and only listening that makes a narrow compartment feel
The . Generally, when a person listens to the sound emitted from a sound source, the acoustic
energy density ratio between the direct sound reaching the ear directly from the sound source
and the indirect sound emitted from the sound source and reflected by the floor or wall to reach
the ear The distance to the sound source is judged, and when the indirect sound is small, the
sound source is felt close, and when the indirect sound increases, the sound source is felt far.
When listening in a small room such as the vehicle compartment shown in FIG. 1, the distance
between the speaker and the listener is short, and the delay time of the indirect sound is short, so
there is little substantial indirect sound, so FIG. I felt the sound field in the narrow range shown
in A. One of the present inventions eliminates the above-mentioned conventional drawbacks, and
one embodiment of the present invention will be described below with reference to FIGS. 2 and 3.
In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals. The reference
numeral 6 is a speaker disposed at the front end of the vehicle interior of the car, EndPage: 1.
Next, the electric circuit of the sound reproducing apparatus of the present invention will be
described with reference to FIG. In FIG. 3, reference numerals 7 and 7 'denote input terminals,
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and left and right stereo signals are applied to the input terminals 7 and 1, respectively. 8.8 'is a
delay circuit, 9, 9' is a reverberation device, 1o and 1? are amplification circuits, and the left and
right stereo signals are respectively the delay circuits 8 and 8 'and the reverberation device 9. It
is applied to the speakers 4t, 4 / via the q, amplifier circuits 1o, 1?, and emits indirect sound
from the speakers 4, 4 '. Reference numeral 11 denotes an adder, which adds together the left
and right stereo signals, is amplified by the amplifier 12, is applied to the speaker 6, and emits
and emits direct sound from the speaker 6. A subtractor 13 applies a difference between left and
right stereo signals to the phase shifter 14. The phase shifter 14 generates two outputs which
are in-phase in the low band and in anti-phase in the high band, and these two outputs are
respectively added, and the reverberators 9, 9 'are delayed if they are left A circuit (delay time 5
msec?2, omBee) and a feedback circuit that feeds back the output of the delay circuit to the
input terminal can be configured. The phase shifter 14 is preferably a phase shifter having an inphase in the low band and an anti-phase in the high band, specifically at a boundary around 4?)
Hz.
As described above, according to the present invention, the direct sound from the speaker 6 and
the indirect sound delayed with respect to the direct sound are emitted from the speakers 4 and
4 'according to the difference signal between the left and right stereo signals. In order to emit
sound, the listener feels the sound source (speaker) far and senses the spread of the sound field.
A normal 2-channel program source contains a residual component, and the difference signal
between the left and right stereo signals has a large amount of this reverberation component,
and the device of the present invention also reproduces this reverberation component. The
spreading effect is to be increased. In general, when listening in a wide room, various indirect
sounds with different phases are to be heard. In order to obtain the same listening state as in
such a wide room, in the above invention, phase shift is performed. Vessel 14 is used. When the
circuit shown in FIG. 3 is applied to the automobile audio reproducing apparatus shown in FIG. 2,
the sound field is also heard as if the speakers 4 and 4 '6 are R, R' and FK respectively. It can be
expanded to the range shown by '. The arrangement of the speakers is not limited to that shown
in FIG. 2, and the effect can be obtained even if the front and rear are reversed or three speakers
are arranged in front. Furthermore, the present invention is not limited to use for automobiles,
and can be used as a sound reproduction device used in a relatively narrow room.
4. Brief description of the drawings. FIG. 1 is a schematic view of a conventional sound
reproducing apparatus for a car, FIG. 2 is a schematic view of the sound reproducing apparatus
according to an embodiment of the present invention applied to a car, and FIG. FIG. 1 is a pnick
diagram of a sound reproduction device according to an embodiment of the invention. 4.4 ', 6
иииииииии Speaker, 7, 7 ? иииииииииииии Input terminal, 8 8 8 ? иииииииии Delay circuit, 9, 9 ? ииии и Reverberation
device, 10 ░ 1? и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и 13 'ииииии Adder. Name of
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Attorney Attorney Nakao and one other person 7EndPage: ?
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