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JPS566190

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DESCRIPTION JPS566190
? Stereophonic sound reproduction device App. Akira A.S. No. 51-243 ? Special lighting 48137186 [phase] Application A. S. 45 (1970) April 21 [A. 22nd No. 22 Sharp Co., Ltd. ? Applicant
Sharp No. 22 Nagaike-cho, Abeno-ku, Osaka, Japan [Phase] Agent Attorney Attorney Fukushi
Aihiko [Fa] Cited Reference Special Publication 38-427 (JP, Bl)
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a conventional threedimensional sound reproducing apparatus. FIG. 2 is a plan view of an embodiment of a threedimensional sound reproducing apparatus according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a threedimensional sound reproducing apparatus that performs stereo reproduction with three speakers
arranged in close proximity. As described above, as an apparatus for performing stereo
reproduction with speakers arranged close to each other, the one shown in FIG. 1 is
conventionally known. In this device, three speakers 2 and 3. 4 are arranged side by side in one
speaker pock 1, and the right speaker 2 is provided with a left signal (L 1 and a right signal
(difference signal of 8 (LR), center speaker 3 Add the sum signal m (L + R) to. However, m is a
positive constant. The left speaker 4 is supplied with a difference signal (RL) opposite in phase to
the above difference signal. Therefore, in the space on the left side of the speaker box 1, there
are reproduced sound (LR) from the speaker 2 and reproduced sound m (L + R) from the speaker
3, and these signals are acoustically synthesized in the space ( L?R) + m (L + R) ? ? ? ? = (1)
[111111] Similarly, in the space on the right side, (R?L) + m (L + R) ? ? (2). When the equation
(1) or the equation (2) is modified and divided by (1 + m), the left side is LR ((1-m) / (1 + m)) ?
? иии (3) the right side is R?L ((1?m) m) / (1 + m)) "" (4). Now, if m> 1, the second term becomes
positive, and there is positive crosstalk between the left and right signals, and there is crosstalk
between the narrow speaker interval and the three-dimensional effect is impaired. Next, when m
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= 1, the second term becomes O, and only the left and right signals are reproduced. However,
since the speakers are in proximity, a three-dimensional effect can not be obtained. Further, in
the case of m-) 0, () in the second term approaches 1 and only the difference signal is outputted
from the left and right, and the three-dimensional feeling is disturbed conversely. As a result of
the above, m must be 1 or less. That is, the left signal (L) and the slightly opposite phase right
signal (-?R) are obtained on the left side, and the right signal (R) and the slightly opposite phase
left signal (-?L) are outputted on the right side You can get the most stereo feeling when you
are. Since stereo reproduction with this device uses only one speaker system, it is excellent in
compactness and cost, and it requires a large room as in the case of arranging the speaker
systems on the left and right sides of the prior art. Also, there is an advantage that the spacing of
the speaker system does not limit the spread of sound in the case of stereo reproduction, and
that the sound in the central portion is not dropped. However, with this speaker system, the
difference signal (LR)? A dedicated one for producing (R?L) and a sum signal (L + R) is
necessary, and in the low frequency band, two speakers with long wavelengths close to each
other function as one sound source.
In the prior art shown in FIG. 1, the signals reproduced in opposite phases are added to the left
and right speakers 2 and 4 respectively. The sounds reproduced from the speakers 2 and 4
cancel each other at [111111] EndPage: 1 Does not contribute to bass reproduction at all. The
bass is reproduced only by the central speaker 3. Therefore, the reproduced sound pressure of
the bass decreases, and a powerful stereo feeling can not be obtained. The structure of an
embodiment of the three-dimensional sound reproducing apparatus according to the present
invention is as shown in FIG. 2, in which two speakers 14 and 15 are respectively disposed at the
center of the speaker 12 housed in the speaker box 11 via the buckle plate 13. Attach and
configure in the wrong direction in the opposite direction. The left signal (9) is applied to the
right speaker 14 and the combined signal m (L + R) is applied to the right speaker (FO1 and the
speaker 12 to the left speaker 15). However, m is a positive constant. And the outlet of the sound
of the speaker is provided in one of the places indicated by a broken line in the space on the left
side with the baffle plate 13 at the center, and the place indicated by the broken line in the space
at the right side with the panfull plate 13 at the center It is set up either. Thus, the left and right
sides form separate sound outlets. In addition, it is desirable that the attachment position of the
sound outlet on each side be a position facing the speaker 12 in parallel in the broken line.
According to this configuration, in the space on the left side of the buckle plate 13, the left signal
by the speaker 14 (? and the right signal (?R) in reverse phase from the back side of the
speaker 15 and the composite signal m (L + R) by the speaker 12 ), And these signals are
acoustically synthesized in space to become (L) + (? R) + m (L + R) ? и (1) ?, and similarly on
the right side is (R) + (? L) + m It becomes (L + R). = (2) '. The equations (1) 'and (2) 7 are
substantially the same as the equations (1) and (2) of the conventional example described in FIG.
1, and the same applies (10-: WN,:,: r) When W1?: engineering signal (l, slightly opposite phase
right signal (-?R), right signal at right side (seasonal and slightly opposite signal left signal (-?L)
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is output, An effective stereo feeling is obtained. Here, the present invention only adds normal
stereo signals, left signals (?, right signals (f ()) to create a sum signal (L + R), and a threedimensional effect that can easily obtain an effective stereo feeling. An audio player can be
provided. Also, even if two speakers 14 and 15 close to each other act as one sound source in the
low frequency range, the left signal (L) and the right signal (R) can be reproduced individually
without being canceled each other. The reproduced sound does not decrease and a powerful
stereo feeling can be obtained.
That is, in the space on the left side, the m (L + R) signal of the speaker 12, the left signal of the
speaker 14, and the antiphase right signal of the speaker 15 are present. , The left signal of the
speaker 14 is in phase and is added to the in-phase left signal mL of the speaker 12, and only the
left signal is emphasized, while in the right space, only the right signal is emphasized, the stereo
You can get a feeling. It is apparent from the structure of the speaker 14 attached at the
boundary of the baffle plate 13 that the speaker 14 supplies the in-phase left signal to the space
on the left side and the anti-phase left signal to the space on the right side. The same applies to
the speaker 15. Of course, the fact that the speakers 14.degree. 15 are attached to the baffle
plate in a staggered manner, as described above, does not interfere with outputting sound to
each other.
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