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-Specification 1, title of the invention
Sound reproduction device
3. Detailed Description of the Invention The present invention relates to a sound reproduction
apparatus that listens in a relatively narrow room, such as a car cabin of a car. FIG. 1 shows a
conventional audio reproducing system for a car, in which 1 is a car, and 2 and 3 are front seats
and rear seats disposed in 10 rows of 10 cars, respectively. 6 are speakers arranged at the rear
of the rear seat 3, ????????? When stereo signals of 2 channels are applied to the
speakers 4 and 4 'shown in FIG. 1 and listened in the car room, the sound field is limited to the
range A shown by a broken line, and only a listen to feel a narrow single room is obtained The
Generally, when a person listens to the sound emitted from a sound source, the sound energy
density ratio of the sound source to the direct sound reaching the ear more directly and the
indirect sound emitted from the sound source and reflected by the floor, wall, etc. to the ear The
distance to the sound source is judged to determine the distance from the sound source. 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 a single room 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. The present invention is intended to eliminate the above-mentioned
conventional drawbacks, and a second embodiment of the present invention will be described
below with reference to FIG. EndPage: 1 In FIG. 2, 6, 6 'is an input terminal to which a 2-channel
stereo signal is applied, 7, 7' is an amplification circuit, 8, 8 / is a speaker, 9 is an addition adding
left and right stereo signals 10.10 'is a reverberation device that adds reverberation to the left
and right stereo signals to generate a reverberation signal, and this reverberation device 10, 10'
is, for example, a delay circuit (delay time 5 msec to 20 msec) and this delay And a feedback
circuit that feeds back part of the output of the circuit to the input end. The output of the
reverberator 10.10 'is applied to the amplifiers 7, 7' respectively. 11 is an adder. In the adder 11,
the phase inversion circuit 12 outputs the left and right stereo signals added by the adder 9, the
output of the reverberation device 1o, and the output of the reverberation device 10 '. The
inverted signal is added. The signal added by the adder 11 is 1. Power is applied to the phase
shifter 13 and in phase at low frequencies. Two outputs having opposite phases in the high band
are generated, and these 27 outputs are respectively applied to the amplifier circuits 7 and 7 '. It
is to be noted that, as the phase shifter 13, two or more of the same phase in the low band and
the opposite phase in the high band at the boundary of 4QQ??tK, in the sound reproducing
apparatus of the present invention, left and right stereo signals Is applied to the speakers 8, 8 'to
radiate as direct sound, and the left and right stereo signals are applied to the speaker 8.8'
through the reverberators 10, 10 'to emit indirect sounds, and The addition signal of the stereo
signals and the difference signal of the reverberation device 10, 1? are applied and applied to
the phase shifter 13, and this output is applied to the speakers 8, 8 'to be radiated. Since the
listener hears the direct sound 1 indirect sound and the sound corresponding to the difference
component, it becomes possible to carry out the same listening as if the sound was divided into a
wide sound field and reproduced, and the sound field is expanded.
In the case of reproducing and listening in a wide room, various indirect sounds different in
phase are to be heard, and in order to realize the listening state in such a narrow room, the phase
shifter 13 is used in the present invention. Are used. The sound reproducing apparatus according
to the present invention is configured as described above, and according to the present invention,
has the advantage that the sound field can be expanded even when listening in a relatively
narrow room. The sound reproducing apparatus of the present invention is not limited to the one
for automobiles.
4. Brief Description of the Drawings FIG. 1R is a schematic view of a car audio reproducing
apparatus, and FIG. 2 is a block diagram of the sound reproducing apparatus according to an
embodiment of the present invention. 6.6 ? ииииииииииииииии Input terminal 7, 7 ? иииии Amplifier circuit, 8
░ 8 ? иииииииии Speaker, C иииииии Force a'-X , 10 "10" ░ "░ -3 reverberation device, 11 ... adder ... 12 ...
phase inversion circuit, 13 ... phase shifter. Name of agent Attorney Nakao Toshio 1 other 9-1st
fI! ????????? ?
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