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JPS6384400

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DESCRIPTION JPS6384400
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
rear speaker system for reproducing a sound field of a sound field reproduction having realism
by arranging speakers at the front and back. In recent years, with the spread of high-fidelity
video tape recorders and video disks, sound field reproduction having a sense of reality has been
attracting attention. As a prior art, there is a sound field reproduction technology as shown in
FIG. (For example, "Technics 5 H-AV 22 Technical Guide"). The above-mentioned conventional
sound field reproduction will be described with reference to FIG. 2 with reference to the
drawings. In FIG. 2, reference numeral 1 denotes a differential amplifier for obtaining a
difference signal between stereo L channel and R channel. A phase shifter 2 generates a time
delay to the obtained difference signal. An inverting amplifier 3 inverts the polarity of the timedelayed difference signal. An amplifier 4.5 power-amplifies the obtained signal. 10.11 is an
output terminal for the front speaker, 12 ░ 13 is an output terminal for the rear speaker, and
16.17 are 3 Beno L channel, R channel signal input terminals. The sound effect reproduction
apparatus 18 (in the broken line in FIG. 2) configured as described above, the front L channel
speaker 8 and the front R channel speaker 9. Conventional sound field reproduction is
configured by the rear L channel speaker 6 and the rear R channel speaker ?. The operation will
be described below. In FIG. 2, the stereo original signal from the signal input terminal 16.17 and
R become a signal of (R?L) in the differential amplifier 1 and ? (R?L) is signal processed in the
phase shifter 2 and the original After being added to the signal (L ▒ ? (R?L)), the signal is led
to the speaker 8 through the amplifier 4 and the left signal output terminal 1 ░. On the other
hand, the stereo original signal R passes through the phase shifter 2 and is then inverted by the
inverting amplifier 3 to become a signal of -? (R-L), and is further added to the original signal R
(R-? (R-L)) And is led to the speaker 9 through the right signal output terminal 11. Here, the
signal 6 + ? ? of the rear speaker 6.7 is represented by the difference between (R?? (R?L) 1
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and (L + ? (R?L)). That is, the signal of the rear speaker 6.7 becomes (R?L?2? (R = L)), and
the signals generated from the front speakers 8 and 9 are emphasized by emphasizing the signal
having no correlation between the R signal and the L signal. To pronounce. (The signal currents
flowing to the rear speakers ? and 7 are the same.
By the above-described configuration and operation, the sense of direction of the sound source in
a program source such as a tape or a record is preserved, and an acoustic effect with nine senses
of realism and expansion can be obtained. This is defined as a sound effect, and the abovementioned sound effect is simply called a sound effect. Problems to be Solved by the Invention
However, in the conventional configuration, although two speakers for front reproduction and
two for rear reproduction are required to obtain a sound effect, as described above, the same
signal current is applied to the rear speakers. However, in the case of one speaker, there is a
problem that the sound generation position becomes one place and the feeling of spreading is
lost. SUMMARY OF THE INVENTION In view of the above problems, the present invention
provides a rear speaker system for sound field reproduction without losing a feeling of expansion
even if the rear speakers have one page and five pages. Means for Solving the Problem In order
to achieve the above purpose, the rear left signal output of the device reproducing sound effects
(surround device) is connected to the speaker positive direction input terminal, and the rear right
signal output is speaker negative. By connecting to the direction input terminal ?, the surround
back signal (R?L?2? (R?L)) is produced by one speaker, and the sound produced by the
speaker is directed to the right by the sound reflector. It is configured to sound in the sound field
from the leftward sound groove. Operation With the above-described configuration, the present
invention can realize the surround effect without causing deterioration of the sense of expansion
with one rear speaker. Embodiment A rear speaker system for sound field reproduction
according to an embodiment of the present invention will be described with reference to FIG. FIG.
1 a is a front view of the rear speaker system for sound field reproduction according to the
present invention, as viewed from the front (6 faces showing a partially cut surface). Fig. 1 is a
perspective view of a rear speaker system for sound field reproduction as viewed from the rear.
In FIG. 1, a signal of (R-? (R-L)) is applied to the speaker terminal 23a from a surround
equipment and a rear signal output terminal, and a signal of (L + ? (R-L)) is applied to the
speaker terminal 23b. Is applied. The speaker 21 generates a signal of (R?L?2? (R?L)). The
signal produced from the speaker 21 is radiated from the side surface of the speaker box to the
sound field by the sound reflecting plate 24 in the front of the speaker 21 and the sound grooves
20a and 20b. Effects of the Invention As a result of the above, the same surround effect as in the
case of driving by two rear speakers isometrically obtained by emitting one speaker from both
sides of the speaker box to the sound field even when driven only .
[0002]
Brief description of the drawings
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[0003]
1a is a partially cutaway perspective view of a rear speaker system for sound field reproduction
according to an embodiment of the present invention as viewed from the front, and FIG. 7 shows
a rear speaker system for sound field reproduction according to an embodiment of the present
invention. FIG. 2 is a block diagram showing an acoustic effect reproduction apparatus and a
configuration for obtaining a conventional surround effect, as viewed from the rear surface.
20a, a sound track for guiding the side surface of the 2OB и и и и и sound, 21 ...... speaker, 22 ......
sump enclosure for sealing for operation of the speakers, 23a, 23b и и и? ? ? Speaker terminal,
24 ииииииииии Sound reflector
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