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JPH06178379

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH06178379
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
video viewing system applied to a television receiver or the like, and more particularly to an
audio reproduction technique.
[0002]
2. Description of the Related Art When viewing a television broadcast or a video program in
which the audio is converted to stereo by a television receiver, a plurality of speakers are
arranged around the video display unit of the television receiver to provide a three-dimensional
effect. A certain sound is made to be reproduced. As such a reproduction method, there is a
method called surround stereo. In this surround stereo, an acoustic effect (this is called a
surround effect) accompanied by a sense that the sound source surrounding the listener exists
and a sense of expansion is obtained while the sense of direction of the sound source of the
original signal is preserved in the reproduction sound field. Playback method.
[0003]
An example of a conventional configuration for reproducing the surround stereo is shown in FIG.
3. In the drawing, reference numeral 1 denotes a television receiver, and an image displayed on
the screen of the television receiver 1 is located substantially at the center of the room. The
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viewer a who is watching is watching. Then, the left and right speaker devices 2L and 2R for the
front are disposed on the left and right sides of the television receiver 1, and the respective
speaker devices 2L and 2R are connected by the front speaker connection terminal of the
television receiver 1 and the signal line 3. Let In addition, rear left and right speaker devices 4L
and 4R are disposed at the left and right corners of the room behind the viewer a, and the rear
speaker devices 4L and 4R are used as rear speaker connection terminals of the television
receiver 1. And the signal line 5. Then, reverberation components and the like of the original
signal are output from the rear speaker devices 4L and 4R so that a surround effect in which a
sound source surrounding the viewer a exists is obtained.
[0004]
SUMMARY OF THE INVENTION By performing such surround stereo reproduction, reproduction
of realistic sound is performed. However, arranging the speakers in this way causes various
inconveniences. That is, since the rear speaker devices 4L and 4R are disposed at the corners of
the room apart from the television receiver 1, it is necessary to make the signal lines 5 to be
connected longer, which makes the wiring operation complicated and also aesthetically the room
Therefore, it is not preferable that the wiring be present along the wall for a long time.
[0005]
SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention
to facilitate installation of a rear speaker when performing this type of reproduction method.
[0006]
According to the present invention, for example, as shown in FIG. 1, a video display unit 1 and a
plurality of speakers for outputting audio matched to the video displayed on the video display
unit 1 are provided. In the video viewing system, the front speakers 2L and 2R are disposed on
the left and right sides of the video display unit 1 as speakers, and a rear having a sharp
directivity in the vicinity of the front speakers 2L and 2R. The speakers 6L and 6R are disposed,
and the acoustic reflection plate 10 for reflecting the sound output from the rear speakers 6L
and 6R is disposed behind the viewer of the video displayed on the video display unit 1. .
[0007]
Further, in this case, the mirror 12 is attached to at least a part of the acoustic reflection plate
10.
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[0008]
Further, in this case, the acoustic reflection plate 10 is configured by a curved surface.
[0009]
In this case, a sound absorbing material is disposed on the back surface of the acoustic reflection
plate 10.
[0010]
[Operation] According to the present invention, the sound output from the front rear speaker is
reflected by the rear acoustic reflector and reaches the viewer, so the same acoustic effect as that
of the rear speaker is provided. can get.
[0011]
In this case, by attaching a mirror to the acoustic reflection plate, the rear reflector can be seen
through the mirror from the position where the viewer is located, so that the arrangement state
of the acoustic reflection plate can be optimized. it can.
[0012]
Further, by forming the acoustic reflection plate as a curved surface, the sound output from the
rear speaker can be efficiently reflected to the viewer side.
[0013]
Further, by arranging the sound absorbing material on the back surface of the acoustic reflection
plate, it is possible to eliminate the adverse effects such as the vibration of the acoustic reflection
plate itself.
[0014]
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
be described below with reference to FIGS.
In FIG. 1 and FIG. 2, parts corresponding to FIG.
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[0015]
This example is applied to a system that reproduces stereo sound of a surround system, and FIG.
1 is a diagram showing an arrangement state of speakers and the like.
In this example, the front speaker devices 2L and 2R are disposed on the left and right sides of
the television receiver 1, and the rear speaker devices 6L and 6R are also disposed in the vicinity
of the front speaker devices 2L and 2R.
In this case, as the rear speaker devices 6L and 6R, a speaker device using a directional
directivity sharp speaker unit is used.
For example, a horn-type speaker unit is used as the directional sharp speaker unit.
The front speaker connection terminal of the television receiver 1 is connected to the front
speaker devices 2L and 2R through the signal line 3, and the rear speaker connection terminal of
the television receiver 1 is connected through the signal line 7 to the rear speaker device 6L,
Connect with 6R.
[0016]
Then, the audio output unit is directed to the center side of the room so that the audio output
from the front speaker devices 2L and 2R can reach the viewer a located at the center of the
room directly.
The arrangement of the front speaker devices 2L and 2R is the same as in the prior art.
And for this rear so that the sound outputted from the left and right rear speaker devices 6L and
6R composed of the sharp directional speaker unit can reach the left and right corners of the
rear of the room (rear of the viewer a) The direction of the speaker devices 6L and 6R is set.
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[0017]
Then, the acoustic reflectors 10 are respectively disposed at the rear left and right corners of the
room to which the sound from the rear speaker devices 6L and 6R reaches.
The sound reflecting plate 10 is shown in FIG. 2 as a curved surface that is made of a material
that efficiently reflects sound such as wood, metal, synthetic resin, stone, etc. To do.
In this case, a relatively small mirror 12 is attached to a substantially central portion of the inner
surface 11. Further, the sound absorbing material 13 is attached to the back surface.
Furthermore, a leg 14 is installed at the lower part, and this acoustic reflector 10 is made to
stand upright.
[0018]
Two acoustic reflectors 10 configured in this way are prepared and arranged at the corners of
the room as shown in FIG. 1. When adjusting the installation position, the mirror 12 of the
acoustic reflector 10 is used. Use That is, the sound reflecting plate 10 is viewed from the
position where the viewer a views and adjusted so that the left or right rear speaker device 6L or
6R can be seen through the mirror 12 at the center. By adjusting in this manner, the viewer a can
reach the position where the sound output from the left and right rear speaker devices 6L and 6R
configured by the directional speaker units is reflected by the acoustic reflection plate 10 and
reaches. As a result, the audio output from the rear speaker devices 6L and 6R can be heard from
behind the viewer a.
[0019]
Therefore, the sound is reproduced in the same manner as the rear speaker devices 6L and 6R
are disposed behind the viewer a, and a sound field where a surround effect can be obtained is
formed. And in this example, since the rear speaker devices 6L and 6R are on the left and right
sides of the television receiver 1, the signal line 7 for connecting to the television receiver 1 can
be shortened, and the rear speaker Since the wiring work for installing the devices 6L and 6R is
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simple and there is no need to draw the signal lines long, the appearance of the room is not
impaired by the wiring of the signal lines.
[0020]
Note that if sharp directional speaker units are used as the rear speaker devices 6L and 6R as in
this example, only relatively high-frequency sound is reproduced as the reproduction
characteristic, but in surround stereo, the rear speakers There is no problem in use as the sound
reproduced from the speaker is only a relatively high frequency sound affecting the sound field.
[0021]
Moreover, in the above-mentioned embodiment, although the mirror 12 was provided in the
center part of the acoustic reflection plate 10, it is not necessary to install this mirror.
Alternatively, the entire inner surface 11 of the acoustic reflection plate 10 may be a mirror.
Further, although the sound absorbing material 13 is disposed on the back surface of the
acoustic reflection plate 10, it may be an elastic body such as rubber. Alternatively, the sound
absorbing material or the elastic body may be omitted. Further, although the acoustic reflection
plate 10 is a curved surface in the above embodiment, it may be a flat surface.
[0022]
Although the rear speaker devices 6L and 6R and the front speaker devices 2L and 2R are
separate from the television receiver 1, they may be integrated with the television receiver 1.
Further, although the above embodiment is applied to the case of performing surround stereo
reproduction, the present invention can also be applied to reproduction of a stereo system
requiring other rear speakers. Furthermore, although the viewing system using the television
receiver is configured in the above embodiment, it may be a viewing system using another video
display device.
[0023]
According to the present invention, the sound output from the front rear speaker is reflected by
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the rear acoustic reflector and reaches the viewer. Therefore, the same sound as that of the rear
speaker is disposed at the rear. An effect is obtained. Therefore, the rear speaker can be arranged
in the vicinity of the image display unit, and it is not necessary to extend the signal line for
connecting the rear speaker to the sound source long, and the wiring operation is easy and the
appearance of the wiring installation place There is no loss of
[0024]
In this case, by attaching a mirror to the acoustic reflection plate, the arrangement of the acoustic
reflection plate can be optimized by adjusting so that the rear speaker can be seen through the
mirror from the position where the viewer is. It is easy.
[0025]
Further, by forming the acoustic reflection plate as a curved surface, the sound output from the
rear speaker can be efficiently reflected to the viewer side.
[0026]
Further, by arranging the sound absorbing material on the back surface of the acoustic reflection
plate, it is possible to eliminate the adverse effects such as the vibration of the acoustic reflection
plate itself.
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