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JPH0678392

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH0678392
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
construction of a multi-channel audio reproduction system for improving sound image
localization.
[0002]
2. Description of the Related Art FIG. 42, no. 6 is a block diagram showing the configuration of a
conventional multi-channel audio reproduction apparatus for reproducing high-definition audio
signals described in 6, for example, the configuration of Cinema Nouveau 36 manufactured by
Mitsubishi Electric Corp. described in catalog S-C4141-A. is there. In the figure, 1 is a parabola
antenna for receiving radio waves (12 GHz) transmitted from satellites and converting it into a 1
GHz signal, 2 selects a necessary channel from the signals converted by the parabola antenna 1
and outputs a MUSE signal A tuner 3 decodes the MUSE signal into the original audio signal and
video signal. A MUSE decoder 4 outputs a right channel audio signal output from the MUSE
decoder 3. A center channel audio signal 5 outputs the MUSE decoder 3. 6 is a left channel audio
signal output from the MUSE decoder 3, 7 is a rear channel audio signal output from the MUSE
decoder 3, 8 is an amplifier circuit for amplifying the right channel audio signal 4, and 9 is a
center channel audio signal. An amplification circuit for amplifying the signal 5, 10 is the above
left channel sound An amplifier circuit for amplifying the signal 6, an amplifier circuit 11 for
amplifying the back channel audio signal 7, a right speaker 12 driven by the amplifier circuit 8, a
center speaker 13 driven by the amplifier circuit 9, 14 is a left speaker driven by the amplifier
circuit 10, 15 is a rear speaker driven by the amplifier circuit 16, 16 is a video signal output
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from the MUSE decoder 3, and 17 is a CRT for reproducing the video signal 16. And the like, and
18 is a viewer.
[0003]
First, the operation of each part will be described. The radio wave received by the parabola
antenna 1 is converted into a MUSE signal by the tuner 2 and passes through the MUSE decoder
3 to obtain audio signals 4 to 7 and a video signal 16 for high vision. The audio signals 4 to 7 of
each channel output from the MUSE decoder 3 are amplified independently by the amplifier
circuits 8 to 11, respectively, and are converted to audio by the right speaker 12, the center
speaker 13, the left speaker 14 and the rear speaker 15. It is converted and perceived by the
viewer 18. Further, the video signal 16 output from the MUSE decoder 3 is converted into a
video by the video display device 17 and perceived by the viewer 18.
[0004]
Also, there are several types of audio signals for high vision, and the types of audio signals and
the number of channels to be reproduced differ depending on the mode. For example, when the
mode of the audio signal is a 3-1 system 4-channel stereo, audio signals of four channels for
right, center, left and rear are reproduced. In addition, when the mode of the audio signal is 2channel stereo, audio signals of 2 channels for right and left are reproduced.
[0005]
Next, the arrangement of the center speaker will be described. FIG. 4 is a diagram showing a
general arrangement of center speakers in a conventional multi-channel audio reproduction
apparatus. In the figure, reference numeral 13a denotes a speaker unit of the center speaker 13,
17a denotes a cathode ray tube of the video display device 17, and 19 denotes a TV stand for
mounting the video display device 17 and accommodating AV equipment such as VTR.
[0006]
In FIG. 4, the center speaker 13 is disposed forward on the lower side of the screen of the image
display device 17.
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2
[0007]
FIG. 5 is also a diagram showing a general arrangement of center speakers in the conventional
multi-channel audio reproduction apparatus.
In the figure, 20 and 21 indicate first and second amplification circuits for amplifying the
distributed center channel audio signal, 22 indicates a first center speaker disposed on the upper
side of the screen of the video display device 17, and 22a indicates the above-mentioned A
speaker unit of the center speaker 22, a second center speaker 23 disposed on the lower side of
the screen of the video display device 17, and a speaker unit 23 a of the second center speaker
23 are disposed.
[0008]
The center channel audio signal 5 is divided into two, one of which is amplified by the first
amplifier circuit 20 and converted into audio by the first center speaker 22. Further, the other is
amplified by the second amplifier circuit 21 and converted into voice by the second center
speaker 23.
[0009]
In FIG. 5, the first center speaker 22 is disposed forward on the upper side of the screen of the
image display device 17, and the second center speaker 23 is disposed forward on the lower side
of the screen.
[0010]
Furthermore, FIG. 6 is also a diagram showing a general arrangement of center speakers in the
conventional multi-channel audio reproduction apparatus.
[0011]
Since the casing of the image display device 17 is formed along the shape of the Braun tube 17a,
a recess is formed on the upper surface.
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In FIG. 6, the first center speaker 22 is disposed upward in the recess.
The other parts are the same as in FIG.
[0012]
As shown in FIG. 4, the sound image of the center speaker 13 is localized below the image of the
video display 17. As a result, there is a problem that the position of the sound image and the
position of the image shift, resulting in unnatural sound image localization.
[0013]
On the other hand, in FIG. 5, the sound images of the center speakers 22 and 23 are synthesized
and localized between the two speakers. As a result, the position of the sound image matches the
position of the image, and natural sound image localization can be obtained. However, since the
first center speaker 22 is mounted on the image display device 17, it is necessary to secure an
extra space for that amount, and there is a problem that the installation becomes worse.
[0014]
Also, in FIG. 6, the installation is improved as compared with FIG. However, since the first center
speaker 22 is disposed upward, the sound of the first center speaker 22 is radiated upward. As a
result, the sound pressure level can not be increased at the position of the viewer 18, and there is
a problem that the sound image of the center speakers 22 and 23 approaches the second center
speaker 23.
[0015]
The present invention has been made to solve the above-mentioned problems, and an object of
the present invention is to realize a multi-channel audio reproduction apparatus capable of
obtaining natural sound image localization and having good installation.
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[0016]
SUMMARY OF THE INVENTION A multi-channel audio reproduction apparatus according to the
present invention comprises an open / close reflector capable of arbitrarily adjusting an angle of
a first center speaker disposed upward on the upper side of a screen of a video display
apparatus. It is attached.
[0017]
In addition, an opening / closing reflector is attached to the first center speaker, and an opening
/ closing device for opening / closing the reflection plate, and a control circuit for controlling the
opening / closing device according to the mode of the audio signal are provided.
[0018]
In the multi-channel audio reproducing apparatus according to the present invention, the first
center speaker disposed upward on the upper side of the screen of the video display device is
attached with an open / close reflection plate capable of adjusting the angle arbitrarily to
forward the sound. Make it emit.
[0019]
EXAMPLES Example 1
FIG. 1 is a diagram showing the configuration of a multi-channel audio reproduction apparatus
according to a first embodiment of the present invention.
In the drawing, reference numeral 22 b denotes a baffle surface of the first center speaker 22,
and 24 denotes an open / close type reflector which can adjust the angle arbitrarily.
The other parts are the same as those of the conventional example (see FIG. 6), so the description
will be omitted.
[0020]
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Next, the configuration and operation of each part will be described.
An open / close reflecting plate 24 is attached to the baffle surface 22 b of the first center
speaker 22. The opening / closing reflective plate 24 can be arbitrarily adjusted in angle with the
baffle surface 22 b.
[0021]
For example, when the mode of the audio signal is a 3-1 system 4-channel stereo, since the
center speakers 22 and 23 are used, the open / close reflector 24 is opened.
[0022]
As a result, the sound radiated upward from the first center speaker 22 is reflected by the open /
close reflector 24 and emitted forward.
Therefore, since the sound pressure level can be increased at the position of the viewer 18, the
positions of the sound images of the center speakers 22 and 23 and the positions of the image of
the image display device 17 coincide, and natural sound image localization can be obtained.
[0023]
On the other hand, the effect of the open / close reflector 24 varies depending on the angle, and
the amount of sound reflected forward is maximized at an angle of 45 °. Accordingly, the angle
of the opening / closing reflector 24 is suitably about 45 °.
[0024]
Further, when the mode of the audio signal is a two-channel stereo, since the center speakers 22
and 23 are not used, the open / close reflector 24 is closed to improve the installation.
[0025]
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Example 2
FIG. 2 is a diagram showing the configuration of a multi-channel audio reproduction apparatus
according to a second embodiment of the present invention. In the figure, 25 is a discrimination
signal for sending information on the mode of the audio signal from the MUSE decoder 3 to the
control circuit 26, 26 is a control circuit for controlling the switching device 28, 27 is a control
signal output from the control circuit 26, Is an opening / closing device that opens / closes the
opening / closing reflector 24. The other parts are the same as those of the conventional example
(see FIG. 6), so the description will be omitted.
[0026]
In the first embodiment, the opening and closing of the opening / closing reflector 24 is
manually performed, whereas in the second embodiment, the opening and closing of the opening
/ closing reflector 24 is automatically performed according to the mode of the audio signal.
[0027]
Next, the operation of each part will be described.
Information on the mode of the audio signal is sent from the MUSE decoder 3 to the control
circuit 26 by the discrimination signal 25. Based on this information, the control circuit 26
controls the opening / closing device 28 by the control signal 27 to open / close the open / close
reflector 24.
[0028]
For example, when the mode of the audio signal is a 3-1 system 4 channel stereo, since the
center speakers 22 and 23 are used, the control circuit 26 operates the opening and closing
device 28 by the control signal 27 to open the openable reflector 24. It opens up to a preset
angle, for example 45 °.
[0029]
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As a result, the sound radiated upward from the first center speaker 22 is reflected by the open /
close reflector 24 and emitted forward.
Therefore, since the sound pressure level can be increased at the position of the viewer 18, the
positions of the sound images of the center speakers 22 and 23 and the positions of the image of
the image display device 17 coincide, and natural sound image localization can be obtained.
[0030]
When the audio signal mode is 2-channel stereo, the center speakers 22 and 23 are not used, so
the control circuit 26 operates the opening / closing device 28 with the control signal 27 to close
the opening / closing reflector 24 and installability. Improve
[0031]
Example 3
In each of the above embodiments, the case of reproducing the audio signal for high vision has
been described. However, the present invention can be applied to the Dolby Surround system
having the same channel configuration, and the same effect can be obtained.
[0032]
As described above, according to the present invention, since the sound of the first center
speaker disposed upward on the upper side of the screen of the image display device is radiated
forward by the reflector, Natural sound image localization can be obtained without impairing the
installation.
[0033]
Brief description of the drawings
[0034]
1 is a diagram showing the configuration of a multi-channel audio reproduction apparatus
according to a first embodiment of the present invention.
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[0035]
<Figure 2> It is the figure which shows the constitution of the multi channel sound playback
device in the execution example 2 of this invention.
[0036]
3 is a block circuit diagram showing a configuration of a conventional multi-channel audio
reproduction apparatus.
[0037]
4 is a diagram showing a first example of the arrangement of the center speaker in the
conventional multi-channel audio reproduction apparatus.
[0038]
5 is a diagram showing a second arrangement example of the center speaker in the conventional
multi-channel audio reproduction apparatus.
[0039]
6 is a diagram showing a third example of the arrangement of the center speaker in the
conventional multi-channel audio reproduction apparatus.
[0040]
Explanation of sign
[0041]
20 first amplifier circuit 21 second amplifier circuit 22 first center speaker 23 second center
speaker 24 open / close reflector 25 identification signal 26 control circuit 27 control signal 28
opening / closing device
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