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Specification '1, Title of the Invention
Sound reproduction device
7'3, Detailed Description of the Invention Fig. 1 is a conventional car sound reproduction device
for automobile? In the figure, 1 is a car, 2.3 are front and rear seats respectively disposed in the
room of the car 10, and 4.4 'is a speaker 51-t handle located at the rear of the rear seat 3. . When
a stereo signal of 2 channels is applied to the speakers 4 and 4 'shown in FIG. 1 and listened in
the car room, the sound field is broken, and it is limited to the range A- shown in 4; I was not
beaten. Generally, when a person listens to the sound emitted from a sound source, the sound
energy ratio of 4 degrees between the direct sound that reaches M close-up from the sound
source and the indirect sound that is emitted from the sound source and reflected by the floor,
wall, etc. reaches the ear The distance to the sound source is judged, and if the indirect sound is
small, the sound source is close <(y is felt, and if the indirect sound increases, the sound source is
felt far. When listening in a small room such as the car room shown in Fig. 1, the distance
between the speaker and the listening department is short, and the delay time of the indirect
sound is short, so there is little substantial indirect sound 1, so death 1 The sound field was felt
in the narrow range shown in A of the figure. EndPage: The present invention eliminates the
above-mentioned conventional drawbacks, and one embodiment of the present invention will be
described below with reference to FIGS. In FIG. 2, the same reference numerals as in FIG. 1
denote the same parts. 6ij is a speaker, located at the front of the vehicle compartment of the car.
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,
and left and right stereo multiplication signals are applied to the input terminals 7 and 7' of this
Ic '. 8 and 8 'are amplification circuits, 4 and 4' are the above-mentioned speakers, and 9 is an
adder. The left and right stereo signals are added by the adder 9, and the boosting signal is added
to the reverberation device 1o. To generate a reverberation signal added with reverberation. For
example, the reverberation apparatus 1o can be constituted by four delay circuits (delay times
6m5ec to 20m5'ec) and a feedback circuit which feeds back the output of the delay circuit to the
input terminal. One output is applied to the speaker 6 through the amplifier circuit 12. The other
output of the above-mentioned phase shifter publication is applied to the amplification circuits 8
and 8 '. The phase shifter 11 is preferably a phase shifter having an in-phase in the low band and
an anti-phase in the high band, specifically at a boundary around 400 Mz. 13 is a subtractor,
which is the difference between the left and right stereo signals. A signal is to be applied to the
phase shifter 14. Similar to the phase shifter 11, this phase shifter 14 generates all two signals
which are in phase in the low band and in antiphase in the high band, and these two signals are
output to the amplifiers 8, 8 'respectively. It is.
In FIG. 3, the stereo signal on the right applied to the input terminals 7, 7 'is applied to the
speakers 4, 41 through the amplifiers B, Blf, and the speakers 4, 4/75, etc. It is emitted. Further,
the reverberation signal obtained through the adder 9 and the reverberator 10 is transmitted
through the phase shifter 11 to the speaker 4. . The difference signal applied to 4 'and 6' and
obtained by valley spin is applied to the speakers 4 and 4 'through the phase shifter 14, and a
sound corresponding to the difference signal of the left and right stereo signals is emitted. As
described above, three kinds of sounds are emitted at the above-mentioned smiley, and both
direct and indirect sounds are emitted (. 'I feel the sound source (“speaker”) far away and
expand the sound field! It's something you feel. ° Always two channels Nergurogu: the source
also contains the remaining 4 components, the difference signal of the left and right stereo signal
has a large amount of this residual component, ° above 萼 @; Since the reverberation
component is also reproduced, the expansion of the sound field is an increase in the effect. Note
that if you listen in a large room, you will hear different indirect sounds that are different in
phase, so in order to obtain a listening state in such a large room and the listening state of a
colleague, the above-mentioned example is necessary In the above, the phase shifter 11.14 is
used. , 6 sounds like R, R /, and Fi, respectively, and the sound field can be expanded to the range
indicated by -A '. The arrangement of the speakers is not limited to the arrangement shown in
FIG. 2. The arrangement of the front and back may be reversed, or three speakers may be
arranged forwardly, and other arrangements may also be used. The effects of field expansion can
be obtained. Further, the device according to the present invention is not limited to that for
automobiles, and can be used as a sound reproduction device for use in a relatively narrow room.
As apparent from the above examples, according to the present invention, even when listening in
a relatively narrow room, an effect of obtaining a wide sound field can be obtained.
4. Brief description of the drawings 図 1 is a schematic view of a conventional sound
reproduction apparatus for a car, FIG. 2 is a schematic view of the sound reproduction apparatus
according to an embodiment of the present invention applied to a car, and FIG. 0EndPage: 21 o · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Ie path, 13 · · · ·. ... Subtraction 3),
14 ... Phase shift -Name of the attorney, Toshio Nakao and others 1 person Figure 1 Figure 2
EndPage: 3
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