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JPH0662489

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DESCRIPTION JPH0662489
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of a multi-channel audio reproduction system for improving sound image localization.
[0002]
2. Description of the Related Art FIG. 42, no. 6, based on a conventional multi-channel audio
reproduction apparatus for reproducing a high definition 3-1 system 4-channel stereo described
in 6, for example, Mitsubishi Electric Corp. described in catalog S-C4141-A It is a block diagram
showing composition of cinema Nouveau 36. 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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[0003]
Next, 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]
FIG. 5 is a diagram showing a general arrangement of center speakers in a conventional multichannel 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. 5, the center speaker 11 is disposed below the screen of the image display device 14.
[0006]
FIG. 6 is also a diagram showing a general arrangement of center speakers in the conventional
multi-channel 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]
Next, the operation and configuration of each part will be described. The center channel audio
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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. 6, the first center speaker 19 is disposed on the upper side of the screen of the image
display device 14, and the second center speaker 20 is disposed on the lower side of the screen.
[0009]
In FIG. 5, 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.
[0010]
On the other hand, in FIG. 6, 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
extra space for that amount, and there is a problem that the installation becomes worse.
[0011]
In addition, since two center speakers are used, if there is a difference between the distance from
the first center speaker 19 to the viewer 15 and the distance from the second center speaker 20
to the viewer 15 There is also a problem that the sound quality is deteriorated.
[0012]
The present invention has been made to solve the above-mentioned problems, and it is an object
of the present invention to realize a multi-channel audio reproduction apparatus which is good in
installation and has little deterioration in sound quality.
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[0013]
A multi-channel audio reproduction apparatus according to the present invention is provided
with a high pass filter (hereinafter referred to as "HPF") in front of a first center speaker disposed
on the upper side of a screen of a video display apparatus. It is
[0014]
In addition, the first center speaker is configured by a speaker suitable for high-pitched sound
reproduction.
[0015]
In the multi-channel audio reproduction apparatus according to the present invention, the first
center speaker is miniaturized by providing the HPF in the front stage of the first center speaker
disposed above the screen of the video display apparatus. Improve the sound quality degradation
due to the difference in distance from the center speaker to the viewer.
[0016]
Further, by configuring the first center speaker with a speaker suitable for high-pitched sound
reproduction, the first center speaker is miniaturized, and the sound quality deterioration due to
the difference in distance from each center speaker to the viewer is improved.
[0017]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a diagram showing
the construction of a multi-channel audio reproduction apparatus according to a first
embodiment of the present invention.
In the figure, 21 is an HPF for passing only high-range audio signals, 22 is a first center speaker
disposed on the upper side of the screen of the video display 14, and 22a is a unit for high sound
of the first center speaker 22. It is.
The other parts are the same as those of the conventional example (see FIG. 6), so the description
will be omitted.
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[0018]
Next, the operation and configuration of each part will be described.
The center channel audio signal amplified by the first amplifier circuit 17 is separated into high
frequency audio signals by the HPF 21 and converted into audio by the first center speaker 22.
[0019]
As described above, when the HPF 21 is provided at the front stage of the first center speaker
22, the high sound unit 22a can be used for the speaker unit, and the first center speaker 22 can
be miniaturized.
As a result, the first center speaker 22 can be incorporated in the video display device 14.
Therefore, it is not necessary to secure an extra space for the first center speaker, and the
installation is improved.
[0020]
Further, since only the high-range audio signal is reproduced by the first center speaker 22, the
distance from the first center speaker 22 to the viewer 15 and the distance from the second
center speaker 20 to the viewer 15 The difference in the distance between the two causes less
sound blurring and improves the sound quality deterioration.
[0021]
Embodiment 2 FIG. 2 is a diagram showing the configuration of a multi-channel audio
reproduction apparatus according to Embodiment 2 of the present invention.
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In the figure, reference numeral 23 denotes a speaker suitable for high-pitched sound
reproduction, for example, a first center speaker composed of a piezoelectric speaker.
The other parts are the same as those of the conventional example (see FIG. 6), so the description
will be omitted.
[0022]
First, the operation principle of the piezoelectric speaker constituting the first center speaker 23
will be described (see FIG. 3). In the figure, reference numeral 101 denotes an alternating current
power source, 102 denotes a metal electrode, and 103 denotes a polymeric piezoelectric
material, for example, a polymeric piezoelectric film in which polyvinylidene fluoride is formed
into a film, and generates stress when a voltage is applied. Metal electrodes 102 are attached to
both sides of the polymeric piezoelectric film 103. When an AC voltage output from an AC power
supply 101 is applied to the metal electrode 102, the polymeric piezoelectric film 103 expands
and contracts in a direction perpendicular to the electric field (= X direction in FIG. 3). Therefore,
when the polymer piezoelectric film 102 is curved or fixed at both ends, the expansion and
contraction movement is converted to the up and down movement to operate as a speaker.
[0023]
Next, the configuration of the first center speaker 23 will be described. The first center speaker
23 is formed of a piezoelectric speaker. On the other hand, the reproduction band of the
piezoelectric speaker is determined by the area, and the smaller the area, the higher the shift.
Therefore, in order to improve the sound quality deterioration due to the difference in distance
from each center speaker to the viewer, when only the high frequency audio signal is reproduced
by the first center speaker 23, the first center speaker 23 is used. Are small. As a result, the first
center speaker 23 can be incorporated in the video display device 14 and the installation is
improved.
[0024]
As described above, when the first center speaker 23 is formed of a piezoelectric speaker, the
HPF 21 can be omitted, so the cost can be reduced as compared with the first embodiment. In
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addition, since a normal speaker uses a magnet, it is necessary to shield the screen so as not to
be magnetized when it is incorporated in the video display device 14. On the other hand, since
the piezoelectric speaker does not use a magnet, there is no need for magnetic shielding, and the
cost is further reduced.
[0025]
Third Embodiment In the second embodiment, the first center speaker 23 is a piezoelectric
speaker. However, other speakers suitable for high-pitched sound reproduction, for example, a
ceramic speaker may be used.
[0026]
Embodiment 4 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 the same channel configuration, and the same effect can be obtained. Be
[0027]
As described above, according to the present invention, the first center speaker disposed on the
upper side of the screen of the image display device is miniaturized and incorporated in the
image display device. Natural sound image localization can be obtained.
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