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JPH05344600

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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 JPH05344600
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of the sound field effect of a multi-channel audio reproduction system.
[0002]
2. Description of the Related Art FIG. 4 is a block diagram showing the configuration of a
conventional multi-channel audio reproduction apparatus for reproducing high-definition audio
signals, such as Cinema Nouveau 36 manufactured by Mitsubishi Electric Corporation. 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 a right channel audio signal output
from the MUSE decoder 3, and a center channel audio signal 5 output from 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 An amplifier circuit for amplifying the channel audio 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 A speaker 14, a left
speaker driven by the amplifier circuit 10, a rear speaker 15 driven by the amplifier circuit 16, a
video signal 16 output from the MUSE decoder 3, and a video signal 17 reproduced the video
signal 16. A video display unit such as a CRT is shown, and 18 is a viewer.
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[0003]
Next, the function 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 19. Further, the video signal 16 output from the MUSE decoder 3 is converted to a video
by the video display unit 17 and perceived by the viewer 19.
[0004]
Problems to be solved by the invention: For audio signals for high vision, 2-channel stereo (audio
signals: for right and left), 3-1 system 4-channel stereo (audio signals: for right, center, left and
rear) There are many modes, etc.). For this reason, a multi-channel audio reproduction apparatus
for reproducing high-vision audio signals is required to obtain a natural sound field effect for all
modes.
[0005]
5 and 6 are diagrams showing a general speaker arrangement of the conventional multi-channel
audio reproduction apparatus. In the figure, 12a is a speaker unit of the right speaker 12, 13a is
a speaker unit of the center speaker 13, 14a is a speaker unit of the left speaker 14, and 19 is a
cabinet for housing the center speaker 13 and the like. In the conventional multi-channel audio
reproduction apparatus, the center speaker 13 is housed inside the cabinet 19, and the right
speaker 12, the left speaker 14 and the video display unit 17 are set in the upper part of the
cabinet 19.
[0006]
In the case of FIG. 5, the speaker unit 12a of the right speaker 12 and the speaker unit 14a of the
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left speaker 14 are equal in height to the center of the screen of the video display unit 17 in
order to reduce the deviation between the position of the sound image It is arranged at the
position. Similarly, the speaker unit 13 a of the center speaker 13 is disposed at the closest
position to the video display unit 17. When the two-channel stereo is reproduced by the speaker
arrangement of FIG. 5, the positions of the sound images of the right speaker 12 and the left
speaker 14 coincide with the positions of the image of the video display unit 17, and a natural
sound field effect is obtained. However, when the 3-1 system 4-channel stereo is reproduced, the
positions of the sound images of the right speaker 12 and the left speaker 14 deviate from the
positions of the sound image of the center speaker 13, resulting in an unnatural sound field
effect. .
[0007]
Further, in the case of FIG. 6, in order to improve the problems of FIG. 5, the speaker unit 12a of
the right speaker 12 and the speaker unit 14a of the left speaker 14 are disposed closest to the
speaker unit 13a of the center speaker 13. Yes. When the 3-1 system 4-channel stereo is
reproduced by the speaker arrangement of FIG. 5, the deviation between the position of the
sound image of the right speaker 12 and the left speaker 14 and the position of the sound image
of the center speaker 13 becomes small and natural Sound field effect is obtained. However,
when two-channel stereo is reproduced, the positions of the sound images of the right speaker
12 and the left speaker 14 deviate from the positions of the image of the video display unit 17,
resulting in an unnatural sound field effect.
[0008]
As described above, the conventional multi-channel audio reproduction apparatus can not obtain
a natural sound field effect for all modes of the reproduced audio signal. In addition, in order to
correspond to all modes, there is a problem that the speaker arrangement has to be changed
each time the mode changes.
[0009]
The present invention has been made to solve the above-mentioned problems, and provides a
multi-channel audio reproduction device capable of obtaining a natural sound field effect for all
modes of an audio signal to be reproduced.
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3
[0010]
SUMMARY OF THE INVENTION A multi-channel audio reproduction apparatus according to the
present invention comprises a plurality of speaker units attached to the right speaker and the left
speaker at different heights, as well as a switch for switching the speaker units, and reproduction.
And a control circuit for controlling the changeover switch in accordance with the mode of the
audio signal to be
[0011]
The electronic control apparatus further comprises a lifting device for moving the right speaker
and the left speaker up and down, and a control circuit for controlling the lifting device according
to the mode of the audio signal to be reproduced.
[0012]
In the multi-channel audio reproduction apparatus according to the present invention, a plurality
of speaker units are attached to the right speaker and the left speaker at different heights, and
the speaker units are switched according to the mode of the audio signal to be reproduced. The
height of the sound image of the right speaker and the left speaker is changed.
[0013]
Further, the height of the sound image of the right speaker and the left speaker is changed by
moving the right speaker and the left speaker up and down by the lifting device according to the
mode of the audio signal to be reproduced.
[0014]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram
showing the structure of a multi-channel audio reproduction apparatus according to Embodiment
1 of the present invention.
In the figure, 12b is a first speaker unit of the right speaker 12, 12c is a second speaker unit of
the right speaker 12, 14b is a first speaker unit of the left speaker 14, and 14c is a second
speaker unit of the left speaker 14. A speaker unit, 20 is a first switch for switching the first
speaker unit 12b and the second speaker unit 12c, 21 is a second switch for switching the first
speaker unit 14b and the second speaker unit 14c. A changeover switch 22 is a discrimination
signal for transmitting information on the mode of the audio signal from the MUSE decoder 3 to
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the control circuit 23. A control circuit 23 controls the first changeover switch 20 and the second
changeover switch 21. Output from control circuit 23 A control signal.
The other parts are the same as those of the conventional example, so the description will be
omitted.
[0015]
First, the speaker arrangement of the right speaker 12 and the left speaker 14 will be described.
Two speaker units (a first speaker unit 12 b and a second speaker unit 12 c) having the same
characteristics are attached to the right speaker 12.
Similarly, the first speaker unit 14 b and the second speaker unit 14 c are attached to the left
speaker 14.
Among these speaker units, the first speaker unit 12b of the right speaker 12 and the first
speaker unit 14b of the left speaker 14 are disposed at positions equal to the height of the screen
center of the image display unit 17. . Further, the second speaker unit 12c of the right speaker
12 and the second speaker unit 14c of the left speaker 14 are disposed at positions closest to the
speaker unit 13a of the center speaker 13.
[0016]
Next, the function 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 23 by the discrimination signal 22. Based on
this information, the control circuit 23 controls the first changeover switch 20 and the second
changeover switch 21 by the control signal 24.
[0017]
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When the mode of the audio signal is 2-channel stereo, the control circuit 23 switches the first
changeover switch 20 and the second changeover switch 21 to the side by the control signal 24.
The first changeover switch 20 is connected to the first speaker unit 12 b of the right speaker
12, and the second changeover switch 21 is connected to the first speaker unit 14 b of the left
speaker 14. Therefore, the right channel audio signal 4 is reproduced by the first speaker unit
12b, and the left channel audio signal 6 is reproduced by the first speaker unit 14b. As a result,
the positions of the sound images of the right speaker 12 and the left speaker 14 coincide with
the position of the image of the video display unit 17, and a natural sound field effect can be
obtained.
[0018]
When the mode of the audio signal is a 3-1 system 4-channel stereo, the control circuit 23
switches the first changeover switch 20 and the second changeover switch 21 to the side by the
control signal 24. The first changeover switch 20 is connected to the second speaker unit 12 c of
the right speaker 12, and the second changeover switch 21 is connected to the second speaker
unit 14 c of the left speaker 14. Therefore, the right channel audio signal 4 is reproduced by the
second speaker unit 12c, and the left channel audio signal 6 is reproduced by the second speaker
unit 14c. As a result, the difference between the positions of the sound images of the right
speaker 12 and the left speaker 14 and the position of the sound image of the center speaker 13
is reduced, and a natural sound field effect can be obtained.
[0019]
As described above, if a plurality of speaker units are mounted at different heights on the right
speaker 12 and the left speaker 14 and the speaker units are switched according to the mode of
the audio signal to be reproduced, it is possible to cope with the change in mode. .
[0020]
Second Embodiment FIG. 2 is a block 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 first lifting device for moving the right speaker 12 up and down, 26 is a
second lifting device for moving the left speaker 14 up and down, 22 is a mode of an audio signal
from the MUSE decoder 3 to the control circuit 23 , 23 is a control circuit for controlling the first
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lifting device 25 and the second lifting device 26, and 24 is a control signal output from the
control circuit 23. The other parts are the same as those of the conventional example, so the
description will be omitted.
[0021]
Next, the function 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 23 by the discrimination signal 22. Based on
this information, the control circuit 23 controls the first lifting device 25 and the second lifting
device 26 with the control signal 24.
[0022]
When the mode of the audio signal is 2-channel stereo, the control circuit 23 operates the first
lifting device 25 by the control signal 24 so that the right speaker 12 is at the height of the
center of the screen of the video display unit 17 as the speaker unit 12a. Move to the equal
position. Further, the second lifting device 26 is operated to move the left speaker 14 to a
position where the speaker unit 14 a is equal to the height of the center of the screen of the
image display unit 17. As a result, the positions of the sound images of the right speaker 12 and
the left speaker 14 coincide with the positions of the image of the video display unit 17, and a
natural sound field effect can be obtained.
[0023]
When the audio signal mode is the 3-1 system 4-channel stereo, the control circuit 23 operates
the first lifting device 25 by the control signal 24 and the right speaker 12 is the speaker unit 12
a of the center speaker 13. It is moved to a position closest to the speaker unit 13a. Further, the
second lifting device 26 is operated to move the left speaker 14 to a position where the speaker
unit 14 a is closest to the speaker unit 13 a of the center speaker 13. As a result, the difference
between the position of the sound image of the right speaker 12 and the left speaker 14 and the
position of the sound image of the center speaker 13 is reduced, and a natural sound field effect
can be obtained.
[0024]
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As described above, by moving the right speaker 12 and the left speaker 14 up and down by the
lifting devices 25 and 26 in accordance with the mode of the audio signal to be reproduced, it is
possible to cope with the change of the mode.
[0025]
Embodiment 3 In the above embodiment, the case of reproducing an audio signal for high vision
has been described. However, the present invention can be applied to a Dolby Surround system
having a similar channel configuration, and the same effect can be obtained.
[0026]
FIG. 3 is a block diagram showing the configuration of a multi-channel audio reproduction
apparatus in which the first embodiment is applied to the Dolby Surround system.
In the figure, 27 is an AV device such as VDP or VTR, 28 is an audio signal output from the AV
device 27, 16 is a video signal output from the AV device 27, and 29 is Dolby Surround encoded
2 Pro Logic Dolby Surround Decoder (hereinafter referred to as "Pro Logic Decoder") that
decodes channel audio signals (right and left) into original 4 channel audio signals (right, center,
left and back) And 22) are discrimination signals for sending information on the operating state
of the prologic decoder 29 from the prologic decoder 29 to the control circuit 23.
The other parts are the same as in the first embodiment.
[0027]
Next, the function of each part will be described. The prologic decoder 29 decodes the twochannel audio signal 28 (= audio signal encoded in the Dolby Surround system) output from the
AV device 27 into the original four-channel audio signal and outputs it. However, when the
operating state is OFF, the audio signal 28 is output as it is. Further, the prologic decoder 29
sends information concerning the operation state of the prologic decoder 29 to the control
circuit 23 by the discrimination signal 22. Based on this information, the control circuit 23
controls the first changeover switch 20 and the second changeover switch 21 by the control
signal 24.
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[0028]
When the operation state of the prologic decoder 29 is OFF, the control circuit 23 switches the
first changeover switch 20 and the second changeover switch 21 to the side by the control signal
24. As a result, the positions of the sound images of the right speaker 12 and the left speaker 14
coincide with the positions of the image of the video display unit 17, and a natural sound field
effect can be obtained (for details, see Example 1).
[0029]
When the operation state of the prologic decoder 29 is ON, the control circuit 23 switches the
first changeover switch 20 and the second changeover switch 21 to the side by the control signal
24. As a result, the difference between the positions of the sound images of the right speaker 12
and the left speaker 14 and the position of the sound image of the center speaker 13 becomes
small, and a natural sound field effect can be obtained (see Example 1 for details).
[0030]
When the second embodiment is applied to the Dolby Surround system, similarly, the portions of
the parabolic antenna 1, the tuner 2 and the MUSE decoder 3 may be replaced with the AV
device 27 and the prologic decoder 29.
[0031]
Fourth Embodiment In the above embodiment, the case where the center speaker is disposed at
the lower part of the video display unit has been described. However, the present invention can
be applied to the case where the center speaker is disposed at the upper part of the video display
unit. Is obtained.
[0032]
Embodiment 5 In the above embodiment, the case where the front audio signal has 3 channels
(right, center and left) has been described. However, if the right, center and left audio signals are
included, 3 channels are used. It may be more than.
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For example, the present invention can be applied to the case of four channels (right, center, left
+ sub-woofer) as in the I-MAX 4-2 system, and similar effects can be obtained.
[0033]
Further, the audio signal for the rear may be absent or may be two or more channels.
[0034]
As described above, according to the present invention, the heights of the sound images of the
right speaker and the left speaker are changed in accordance with the mode of the reproduced
audio signal. Sound field effect can be obtained.
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