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JPH0354993

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DESCRIPTION JPH0354993
[0001]
FIELD OF THE INVENTION The present invention relates to a loudspeaker system having
bidirectionality. 2. Related Art In recent years, with the improvement of video imaging
technology, it has become possible to perform movie screening using a large screen even at
home. Accompanying this, acoustic devices are also required to have the power and sound
quality appropriate for a large screen. From such a background, as shown in FIG. 4, the audio
device combined with the home video player fit i 4 has two or three skica systems 9 in front of
the viewer 1l, and 2 in the side or back. It is often a so-called surround sound field reproduction
apparatus using a book or more speaker system 12. The front channel of this surround sound
field reproduction device is a signal such as soft audio to be reproduced and background music,
and the rear channel is a signal related to indirect sound and reverberation synthesized by using
a special processing device of the front channel signal. We are dealing. The Sbika system of each
channel is basically required to have the performance corresponding to the signal to be handled,
but if the timbre of the direct sound component coming from the front and the indirect sound or
sound component coming from the back is different, the viewer may feel discomfort. The front
and rear skier systems should preferably be of the same type. In addition, since the rear channel
handles indirect sound, it is desirable from the point of raising a good surround effect to install a
skier system so that the sound from the speaker system does not reach the viewer directly and
sound localization does not occur. For example, as shown in FIG. 4, there is a method of achieving
the above-described effect by dispersing the sound source by using a large number of rear skir
systems to surround viewing consideration. However, on the other hand, it is required to be
effective by using as few skier systems as possible because of the problem of installation location
and cost. From the above points, a skier system as shown in the cross-sectional view of FIG. 5 has
been proposed as a rear skier system. In FIG. 5, reference numerals 1 and 2 denote speaker units
having the same performance, and 3 denotes a cabinet. 2 are electrically connected to operate in
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reverse phase with each other. 6 shows sound pressure frequency characteristics in front of the
speaker unit 1 or the speaker unit 2 of the speaker system shown in the cross sectional view of
FIG. 5, and FIG. 7 shows the scieker system shown in the cross sectional view of FIG. Speaker unit
1. This is an example of polar coordinate directivity characteristics when the front side of the
speaker unit 1 is 180 ° at the front side of the speaker unit 1 in a band above the frequency at
which the equivalent distance between the two sound sources is a half wavelength. , Sound
pressure maximum in front of 2, speaker unit! , 2 from equidistant positions, i.e., both directions
with minimum sound pressure at the side of the cabinet.
Problem to be Solved by the Invention FIG. 8 is an example of an audio apparatus combined with
a home video reproduction apparatus using the Sveker system shown in the cross sectional view
of FIG. 5 as a rear speaker system. As shown in FIG. 7, the directional characteristics of the rearside skier system 13 are bi-directional as shown in FIG. 7, so the sound pressure is minimized
near the viewing position. The sound of the fork system 13 does not reach the viewer 11 directly,
and a good surround effect can be given to the viewer while using a small number of speakers.
However, as shown in FIG. 6, the frequency of the frequency which makes the equivalent
distance between the sound sources of the speaker unit 1.2 a half wavelength as shown in FIG. In
the following bands, the sound pressures of the speaker units 1 and 2 cancel each other out to
cause a sharp drop in the sound pressure level. Since the equivalent distance between the two
sound sources is increased to lower the frequency at which the cancellation starts to occur, or a
large level correction is required on the side of the amplifier that drives the Sbeeker system, a
large problem occurs in practice. SUMMARY OF THE INVENTION In view of the above problems,
the present invention provides a speaker system that can provide a good surround effect to a
viewer while using a small number of speakers, and that does not cause a sharp drop in sound
pressure level in a low range. SUMMARY OF THE INVENTION In order to solve the above
problems, according to the present invention, a speaker unit having the same performance is
attached to both the baffle plate of the cabinet and the baffle plate opposite to each other, and
the interiors of the cabinet have different internal volumes. In such a configuration, both speaker
units are electrically connected to operate in opposite phase to each other. The present invention
can provide a good surround effect to the viewer while using a small number of the abovedescribed configuration, and does not cause a sharp drop in sound pressure level in the low
range. Embodiment An embodiment of the present invention will be described with reference to
the drawings. In FIG. 1, speaker units 1 and 2 having the same performance are attached to a
baffle plate 5 opposed to one full plate 4 of the cabinet 3 respectively. Further, the cabinet 3 is
partitioned by a partition plate 6 so that the cavities 7 and 8 of the interior have different
volumes. Further, the speaker units 1 and 2 are electrically connected in such a way as to operate
in opposite phase to each other. In the above configuration, in the band where the equivalent
distance between the sound sources of the speaker units 1 and 2 is a half wavelength or more,
the sound radiated from the speaker units 1 and 2 has the same amplitude and antiphase
characteristics, so the speaker units 1 and 2 In the front of the figure, the maximum sound
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pressure and the positions equidistant from the speaker units 1 and 2, that is, the directivity
which is the minimum in the sound pressure on the side of the cabinet.
On the other hand, since the internal volumes of the cavities 7 and 8 are different in the low
band, the speaker unit 1 is in front of the speaker unit 1 in FIG. 2 and the speaker unit 2 is in
front of the speaker unit 1 in FIG. As such, they exhibit different low-range regeneration limits.
Therefore, since the speaker unit 1.2 is in the opposite phase but the amplitude level is different,
the cancellation of the sound pressure is alleviated, and a sharp drop in the sound pressure level
as in the skier system shown in the sectional view of FIG. 5 can be prevented. . FIG. 2C shows
sound pressure frequency characteristics on the front surface of the speaker unit 1 when both of
the speaker units 1 and 2 are driven in the skier system according to the present configuration.
Although the speaker unit 1.2 having the same performance is used in the embodiment, it is also
effective to use a multi-way besker system composed of the speaker unit having the same
performance and the dividing network. Needless to say. FIG. 3 is a layout diagram showing an
example of an audio apparatus according to the present invention shown corresponding to FIG. 8
in the prior art, where the speaker system of this embodiment is the system 10 for the rear of the
audio apparatus It is an example at the time of arranging on both sides. The rear scuba system
10 can obtain a better surround effect than in the prior art because the sound pressure level
does not drop sharply in the low region. As described above, according to the present invention,
the speaker unit having the same performance is attached to both the baffle plate and the
opposing baffle plate of the cabinet, and the interiors of the cabinet are partitioned to have
different internal volumes, In addition, by electrically connecting both speaker units to operate in
reverse phase with each other, a good surround effect can be given to the viewer while using a
small number of units, and the sound pressure level drops sharply in the low range. A speaker
system that does not cause
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a skier system according to an embodiment of the present
invention, FIG. 2 is a sound pressure frequency characteristic diagram of the skier system
according to the embodiment, and FIG. 3 is a cross-sectional view of FIG. An arrangement
diagram showing an example of an audio apparatus combined with a home video reproduction
apparatus using a beaker system as a rear skier system, FIG. 4 is a home video reproduction
using a conventional skier system as a rear skier system Fig. 5 is a layout view showing an
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example of an acoustic device to be combined with the device, Fig. 5 is a cross-sectional view of a
conventional bi-directional Sbiker system, Fig. 6 is a sound pressure frequency characteristic
diagram of the Sbiker system, and Fig. 7 is FIG. 8 is a layout diagram showing an example of an
audio apparatus combined with a home video reproduction apparatus using the speaker system
as a rear skier system. .
1.2 · · · speaker unit, 3 · · · cabinet 1-, 4.5 · · · baffle plate, 6 · · · partition plate 7.8 · · · cavity, 9 · · ·
front speaker system 10: Rear skier system 11, 11: Viewer, l4: Video equipment, 16b: Internal
wiring material.
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