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JPH0670393

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH0670393
[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, a conventional multi-channel audio reproduction
apparatus for reproducing a 3-1 high-definition 4-channel stereo system, for example, the
configuration of Cinema Nouveau 36 manufactured by Mitsubishi Electric Corp. described in
catalog S-C4141-A. Is a block diagram showing FIG. In the figure, 1 is a 4-channel audio source
such as a MUSE decoder, 2 is a right-channel audio signal output from the 4-channel audio
source 1, 3 is a center channel audio signal output from the 4-channel audio source 1, 4 is The
left channel audio signal output from the four channel audio source 1, the back channel audio
signal 5 output from the four channel audio source 1, the amplifier circuit 6 amplifying the right
channel audio signal 2, and the center signal 7 An amplifier circuit for amplifying the channel
audio signal 3, 8 an amplifier circuit for amplifying the left channel audio signal 4, 9 an amplifier
circuit for amplifying the rear channel audio signal 5, 10 for the right driven by the amplifier
circuit 6 A speaker 11 is a center speaker driven by the amplification circuit 7 12 is a speaker
Left speaker driven by the serial amplifier circuit 8, 13 rear speaker which is driven by the
amplifying circuit 9, 14 denotes an image display device such as a CRT for reproducing video
signal, 15 is a viewer.
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1
[0003]
First, the operation of each part will be described. The audio signals 2 to 5 of each channel
output from the four-channel audio source 1 are amplified independently by the amplification
circuits 6 to 9, respectively, and the audio from the right speaker 10, the center speaker 11, the
left speaker 12 and the rear speaker 13 And is perceived by the viewer 15.
[0004]
Next, the arrangement of the center speakers will be described. FIG. 6 is a diagram showing a
general arrangement of center speakers in a conventional multi-channel audio reproduction
apparatus. In the figure, 11a is a speaker unit of the center speaker 11, 14a is a cathode ray tube
of the video display device 14, and 16 is a TV stand for mounting the video display device 14
and accommodating AV equipment such as VTR.
[0005]
In FIG. 6, the center speaker 11 is disposed on the lower side of the screen of the image display
device 14 in a forward direction.
[0006]
FIG. 7 is also a view showing a general arrangement of center speakers in the conventional multichannel audio reproduction apparatus.
In the figure, reference numerals 17 and 18 denote first and second amplification circuits for
amplifying the distributed center channel audio signal, 19 denotes a first center speaker disposed
on the upper side of the screen of the video display device 14, and 19a denotes the abovementioned first center speaker. A speaker unit of the center speaker 19 of 1, a second center
speaker 20 disposed on the lower side of the screen of the image display 14, and a speaker unit
20a of the second center speaker 20 are provided.
[0007]
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2
The center channel audio signal 3 is divided into two, one of which is amplified by the first
amplifier circuit 17 and converted into audio by the first center speaker 19. Also, the other is
amplified by the second amplifier circuit 18 and converted into sound by the second center
speaker 20.
[0008]
In FIG. 7, the first center speaker 19 is disposed forward on the upper side of the screen of the
image display device 14, and the second center speaker 20 is disposed forward on the lower side
of the screen.
[0009]
Furthermore, FIG. 8 is also a diagram showing a general arrangement of center speakers in the
conventional multi-channel audio reproduction apparatus.
Since the housing of the image display device 14 is formed along the shape of the Braun tube
14a, a recess is formed on the upper surface. In FIG. 8, the first center speaker 19 is disposed
upward in the recess. The other parts are the same as in FIG.
[0010]
In FIG. 6, the sound image of the center speaker 11 is localized below the image of the video
display device 14. 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.
[0011]
On the other hand, in FIG. 7, the sound images of the center speakers 19 and 20 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 19 is mounted on the image display device 14, it is necessary to secure an
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3
extra space for that amount, and there is a problem that the installation becomes worse.
[0012]
Further, in FIG. 8, the installation property is improved as compared with FIG. However, since the
first center speaker 19 is disposed upward, the first center speaker 19 sound is emitted upward.
As a result, the sound pressure level can not be increased at the position of the viewer 15, and
there is a problem that the sound image of the center speakers 19 and 20 approaches the second
center speaker 20.
[0013]
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.
[0014]
SUMMARY OF THE INVENTION A multi-channel audio reproduction apparatus according to the
present invention uses an oblique speaker as a first center speaker disposed upward on the
screen of a video display apparatus.
[0015]
In addition, a diffuser for diffusing sound is attached to the first center speaker.
[0016]
The multi-channel audio reproduction apparatus according to the present invention radiates
sound forward by using an oblique speaker for the first center speaker disposed upward on the
upper side of the screen of the image display apparatus.
[0017]
Also, by attaching a diffuser to the first center speaker, the sound is emitted forward.
[0018]
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DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a view showing the
configuration of a multi-channel audio reproduction apparatus in Embodiment 1 of the present
invention.
In the figure, 21 is an oblique speaker.
The other parts are the same as those of the conventional example (see FIG. 8), so the description
will be omitted.
[0019]
First, the difference between a general cone speaker and an oblique speaker will be described.
FIG. 2 is a cross-sectional view showing the configuration of a general cone speaker.
In the figure, 101 is a magnet, 102 is a bottom yoke, 103 is a top yoke, 104 is a voice coil, and
105 is a diaphragm.
[0020]
In a general cone speaker, the voice coil 104 is disposed in the magnetic field of the magnetic
circuit composed of the magnet 101, the bottom yoke 102, and the top yoke 103, and the driving
force generated by flowing an audio signal to the voice coil 104. The diaphragm 105 is vibrated
to convert an audio signal into audio.
On the other hand, since the drive portion of a general cone speaker is at the center of the
speaker unit, the sound radiation pattern is as shown in A of FIG.
[0021]
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5
FIG. 3 is a cross-sectional view showing the configuration of the oblique speaker. The diaphragm
104 of the oblique speaker has an obli shape (= shape obtained by cutting a cone at an angle),
and the drive part is offset from the center of the speaker unit. For this reason, the sound
radiation pattern is offset in the long side direction as shown in B of FIG.
[0022]
Next, the configuration and operation of each part will be described. An oblique speaker 21 is
used as the first center speaker 19 and attached so that the long side direction is directed to the
front side.
[0023]
As a result, the sound of the first center speaker 19 is emitted forward. Therefore, since the
sound pressure level can be increased at the position of the viewer 15, the positions of the sound
images of the center speakers 19 and 20 coincide with the positions of the image of the image
display device 14, and natural sound image localization can be obtained.
[0024]
Embodiment 2 FIG. 4 is a diagram showing the configuration of a multi-channel audio
reproduction apparatus in Embodiment 2 of the present invention. In the figure, 21 is a diffuser
for diffusing sound. The other parts are the same as those of the conventional example (see FIG.
8), so the description will be omitted.
[0025]
Next, the structure and function of each part will be described. A diffuser 22 is attached to the
first center speaker 19. The diffuser 22 has, for example, a conical shape, and diffuses the sound
radiated upward from the first center speaker 19.
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[0026]
As a result, the sound of the first center speaker 19 is emitted forward. Therefore, since the
sound pressure level can be increased at the position of the viewer 15, the positions of the sound
images of the center speakers 19 and 20 coincide with the positions of the image of the image
display device 14, and natural sound image localization can be obtained.
[0027]
Embodiment 3 In the above embodiment, the case of reproducing a 3-1 system 4 channel stereo
for high vision has been described, but the present invention can be applied to a Dolby Surround
system having a similar channel configuration, and the same effect can be obtained. Be
[0028]
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 apparatus is
radiated forward, the installation property is improved. Natural sound image localization can be
obtained without loss.
[0029]
Brief description of the drawings
[0030]
1 is a diagram showing the configuration of a multi-channel audio reproduction apparatus
according to a first embodiment of the present invention.
[0031]
2 is a cross-sectional view showing the configuration of a general cone speaker.
[0032]
3 is a cross-sectional view showing the configuration of the observer of FIG.
[0033]
<Figure 4> It is the figure which shows the constitution of the multi channel sound playback
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device in the execution example 2 of this invention.
[0034]
5 is a block diagram showing a configuration of a conventional multi-channel audio reproduction
apparatus.
[0035]
6 is a diagram showing a general arrangement of the center speaker in the conventional multichannel audio reproduction apparatus.
[0036]
7 is a diagram showing a general arrangement of the center speaker in the conventional multichannel audio reproduction apparatus.
[0037]
<Figure 8> It is the figure which shows the general arrangement of the speaker for center in the
conventional multi channel audio playback device.
[0038]
Explanation of sign
[0039]
17 first amplifier circuit 18 second amplifier circuit 19 first center speaker 20 second center
speaker 21 oblique cone speaker 22 diffuser
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