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JPH07236194

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DESCRIPTION JPH07236194
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
video and audio reproducing apparatus having a center channel speaker.
[0002]
2. Description of the Related Art FIGS. 11 and 12 show a conventional video and audio
reproduction apparatus disclosed in, for example, Japanese Patent Laid-Open No. 5-49093. FIG.
11 is a top sectional view and FIG. 12 is a right side sectional view. . In the figure, 1 is a television
case, 2 is a CRT attached to the inside of the television case 1, 3 is a left channel speaker
provided on the left side of the CRT 2 and inside the television case 1, 4 is a CRT 2 Right channel
speaker provided inside the television case 1 on the right side, 5 is a center channel speaker
provided inside the television case 1 at the lower center of the CRT 2 in the left-right direction, 6
is the front of the television case 1 The audience is in the standard listening position of.
[0003]
Next, the operation will be described. An audio signal of the left channel is applied to the left
channel speaker 3 through the amplifier for the left channel to generate a sound. This sound
reaches the viewer 6 and the sound image is localized in the left direction of the viewer 6.
Similarly, the right channel audio signal is applied to the right channel speaker 4 via the right
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1
channel amplifier to generate a sound, the sound image is localized to the right of the viewer 6,
and the center channel audio signal is amplified. A sound is generated by being applied to the
center channel speaker 5 via the center channel, and a sound image is localized in front of the
viewer 6.
[0004]
Thus, the stereo sound field can be reproduced in front of the viewer 6 by reproducing the left
and right and center channel sounds. Assuming that the distance from center channel speaker 5
to viewer 6 is dc, and the distance from left channel speaker 2 and right channel speaker 3 to the
listener's ear is dlr, left channel speaker 3 and the right from the front center of CRT 2 Since the
distance to the channel speaker is longer than the distance from the center of the front surface of
the CRT 2 to the center channel speaker 5 and the front surface of the CRT 2 is a convex curved
surface, dlr> dc.
[0005]
Since the conventional video and audio reproduction apparatus is configured as described above
and dlr> dc, the audio generated from the center channel speaker 5 and the left channel speaker
3 and the right channel speaker 4 are obtained. There is a problem that a time difference occurs
in reaching the viewer 6 with the generated voice.
[0006]
This problem will be described based on the prior art.
Assuming that the sound velocity is c, the difference Δt between the time for the sound
generated from the center channel speaker 5 to reach the viewer 6 and the time for the sound
generated from the left channel speaker 3 and the right channel speaker 4 to reach the viewer 6
is It is expressed by equation (1). Δt = (dlr−dc) / c (1)
[0007]
Since the inside of the CRT 2 is vacuum, atmospheric pressure is applied to the entire surface of
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the CRT 2 from the outside. In order to suppress the generation of distortion due to the
atmospheric pressure and to suppress the weight increase of the CRT 2 itself, the whole is
formed by a smooth convex curve. For this reason, the center channel speaker comes out to the
front. For this reason, the problem of the time difference becomes remarkable in the video and
audio reproduction apparatus using the CRT.
[0008]
FIG. 13 is a diagram showing the time characteristic of sound pressure indicating the arrival time
difference of sound of the conventional video and audio reproduction apparatus. In the figure,
the curve A represents the sound pressure from each of the speakers received by the viewer by
the center channel speaker 5 and the curve B by the left channel speaker 3.
[0009]
For example, assuming that the left channel speaker 3 and the center channel speaker 5 generate
sound pressure having the same absolute value and phase, a sound image is localized in the
middle between the left channel speaker 3 and the center channel speaker 5 if there is no time
difference. There must be. However, when the time difference Δt is 2 milliseconds or more, the
sound image is localized at the position of the center channel speaker 5, and the sound of the left
channel speaker 3 is perceived as reverberation. Even in the case where the time difference Δt is
2 milliseconds or less, localization is performed by the center channel speaker 5 as compared
with the position to be originally localized, and there is a problem that the original stereo sound
field can not be reproduced.
[0010]
The present invention has been made to solve the above-mentioned problems, and by making the
audio of the center channel speaker and the audio of the left and right channel speakers reach
the viewer simultaneously, the original stereo reproduction can be performed. An object is to
obtain a video and audio reproduction apparatus.
[0011]
According to the first aspect of the present invention, in the audiovisual reproduction apparatus
according to the present invention, the acoustic distance from the left and right channel speakers
to the viewer and the acoustic distance from the center channel speaker to the viewer are equal.
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By arranging the front of the driver of the center channel speaker to the rear using the sound
conducting speaker as the center channel speaker, the difference in arrival time of the sound
from the left and right channel speakers and the sound from the center channel speaker to the
viewer can be obtained. It was intended to eliminate it.
[0012]
According to the second aspect of the present invention, a center channel speaker is used as a
center channel speaker so that the acoustic distance from the viewer is equal between the front
of the driver of the left and right channel speakers and the front of the driver of the center
channel speaker. By arranging the driver front of the speaker to the rear, the difference in arrival
time to the viewer between the sound from the left and right channel speakers and the sound
from the center channel speaker is eliminated.
[0013]
In claim 3, the driver of the center channel speaker using the sound conducting speaker in the
center channel speaker so that the acoustic distance from the viewer between the front of the left
and right channel speakers and the front of the driver of the center channel speaker is equal. By
arranging the front on the rear, the difference in arrival time of the sound from the left and right
channel speakers and the sound from the center channel speaker to the viewer is eliminated.
[0014]
According to the fourth aspect of the present invention, the center channel speaker is provided
with a sound conducting speaker so that the acoustic distance from the viewer between the front
of the driver of the left and right channel speakers and the front of the driver of the center
channel speaker is equal. By arranging the driver front of the speaker to the rear, the difference
in arrival time to the viewer between the sound from the left and right channel speakers and the
sound from the center channel speaker is eliminated.
[0015]
In the video and audio reproduction apparatus according to the present invention, since the
sound conduction type speaker is used for the center channel speaker in claim 1, the driver front
surface of the center channel speaker recedes and the acoustic distance from the viewer is
increased. And the acoustic distance from the left and right speakers to the viewer can be made
the same, and the sound image can be prevented from being concentrated at the center.
[0016]
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In the second aspect of the present invention, since the sound conduction type speaker is used
for the center channel speaker, the driver front of the center channel speaker recedes so that the
acoustic distance seen from the viewer and the driver front to the viewer It is possible to make
the acoustic distance of the same, and to avoid concentrating the sound image in the center.
[0017]
Further, in claim 3, since the sound conduction type speaker is used for the center channel
speaker, the driver front of the center channel speaker is retracted, and the acoustic distance
from the viewer and the acoustic distance from the left and right speakers to the viewer And the
sound image can be avoided from being concentrated at the center.
[0018]
In the fourth aspect of the present invention, since the sound conduction type speaker is used for
the center channel speaker, the driver front of the center channel speaker recedes so that the
acoustic distance seen from the viewer and the driver front to the viewer It is possible to make
the acoustic distance of the same, and to avoid concentrating the sound image in the center.
[0019]
Example 1
Hereinafter, the present invention will be described based on the drawings.
1 and 2 show a video and audio reproduction apparatus according to a first embodiment of the
present invention. FIG. 1 is a top sectional view, and FIG. 2 is a right side sectional view.
In the figure, 11 is a television case, 51 is a center channel speaker provided inside the television
case 11 at the center in the horizontal direction of the CRT 2, 51a is a driver of the center
channel speaker 51, 51b is a center channel speaker 51 It is a horn.
[0020]
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Next, the operation of this embodiment will be described.
An audio signal of the left channel is applied to the left channel speaker 3 through the amplifier
for the left channel to generate a sound.
This sound reaches the viewer 6 and the sound image is localized in the left direction of the
viewer 6.
Similarly, an audio signal of the right channel is applied to the right channel speaker 4 via the
right channel amplifier, and a sound is generated to reach the viewer 6 and the sound image is
localized in the right direction of the viewer 6, center channel The audio signal is applied to the
driver 51a of the center channel speaker 51 via the amplifier and a sound is generated to reach
the viewer 6 via the horn 51b of the center channel speaker 51 and the sound image is localized
on the front of the viewer 6 Do.
[0021]
The center channel speaker 51 has a shape in which the horn 51b is provided at the front of the
driver 51a, and the distance from the viewer 6 at the standard listening position to the left
channel speaker 3 and the right channel speaker 4 and the viewer 6 It is possible to adjust the
length of the horn 51b so that the sum of the distance to the opening of the horn 51a of the
center channel speaker 51 and the distance from the opening of the horn 51a to the driver 51a
is the same.
By performing such adjustment, the distances from the viewer 6 to the sound sources of the
respective channels become equal, and the time for the sound to arrive can be made to coincide.
Thereby, the sound field at the time when the signal source is created can be reproduced by the
present video and audio reproduction apparatus.
[0022]
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Example 2
3 and 4 show a video and audio reproduction apparatus according to a second embodiment of
the present invention. FIG. 3 is a top sectional view, and FIG. 4 is a right side sectional view. In
the figure, 12 is a television housing, 32 is a left channel speaker provided inside the television
housing 12 on the left side of the CRT 2, 32a is a driver of the left channel speaker 32, 32b is a
horn of the left channel speaker 32, 42 Is a right channel speaker provided inside the television
housing 12 at the right side of the CRT 2, 42a is a driver of the right channel speaker 42, 42b is
a horn of the center channel speaker 42, 52 is a television housing at the center of the CRT 2 in
the left and right direction. A center channel speaker provided inside the body 12, a driver 52 a
for the center channel speaker 52, and a horn 52 b for the center channel speaker 52.
[0023]
Next, the operation will be described. The audio signal of the left channel is applied to the driver
32a of the left channel speaker 32 through the amplifier for the left channel to generate a sound.
This sound reaches the viewer 6 through the horn 32b of the left channel speaker 32, and the
sound image is localized in the left direction of the viewer 6. Similarly, the audio signal of the
right channel is applied to the driver 42a of the right channel speaker 42 via the right channel
amplifier to generate a sound, which reaches the viewer 6 via the horn 42b and reaches the
viewer 6 right The sound image is localized in the direction, and the center channel audio signal
is applied to the driver 52a of the center channel speaker 52 through the amplifier to generate a
sound, which reaches the viewer 6 through the horn 52b of the center channel speaker 52 for
viewing The sound image is localized in front of the person 6.
[0024]
The sum of the distance from the viewer 6 to the opening of the horn 42b of the right channel
speaker 42 and the distance from the opening of the horn 42b to the driver 42a is dlr2. The
distance from the viewer 6 to the opening of the horn 52b of the center channel speaker 52
Assuming that the sum of the distance and the distance from the opening of the horn 52b to the
driver 52a is dc2, the sound of the right channel is set by setting the length of the horn 52b of
the center channel speaker 52 so that dlr2 and dc2 become equal. There is no difference in
arrival time to the viewer 6 between the voice of the center channel and the voice of the center
channel. Thereby, the sound field at the time when the signal source is created can be
reproduced by the present video and audio reproduction apparatus.
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[0025]
Example 3 5 and 6 show a video and audio reproduction apparatus according to a third
embodiment of the present invention. FIG. 5 is a top sectional view, and FIG. 6 is a right side
sectional view. In the figure, 13 is a television case, 33 is a left channel speaker provided inside
the left side of the television case 13, 43 is a right channel speaker provided inside the right side
of the television case 13, and 53 is Reference numeral 53 a denotes a driver of the center
channel speaker 53 and reference numeral 53 b denotes a horn of the center channel speaker
53.
[0026]
Next, the operation will be described. The audio signal of the left channel is applied to the left
channel speaker 33 through the amplifier for the left channel to generate a sound. This sound
reaches the viewer 6 via the front left corner of the television case 13 and the sound image is
localized in the left direction of the viewer 6. Similarly, the audio signal of the right channel is
applied to the right channel speaker 43 via the right channel amplifier to generate sound and
reach the viewer 6 via the front right corner of the television case 13 The sound image is
localized in the right direction of the viewer 6, and the center channel audio signal is applied to
the driver 53a of the center channel speaker 53 via the amplifier to generate a sound, and the
viewer via the horn 53b of the center channel speaker 53 At 6, the sound image is localized in
front of the viewer 6.
[0027]
The sum of the distance from the viewer 6 to the front right corner of the television housing 13
and the distance from the front right corner of the television housing 13 to the right channel
speaker 43 is dlr3; the viewer 6 to the center channel speaker 53 When the sum of the distance
to the opening of the horn 53b and the distance from the opening of the horn 53b to the driver
53a is dc3, the length of the horn 53b of the center channel speaker 53 is set so that dlr2 and
dc2 become equal. By setting, the difference in arrival time to the viewer 6 between the sound of
the right channel and the sound of the center channel is eliminated. Thereby, the sound field at
the time when the signal source is created can be reproduced by the present video and audio
reproduction apparatus.
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[0028]
Example 4 7 and 8 show a video and audio reproduction apparatus according to a fourth
embodiment of the present invention. FIG. 7 is a top sectional view, and FIG. 8 is a right side
sectional view. In the figure, 14 is a television housing, 34 is a left channel speaker provided
inside the television housing 12 on the left side of the CRT 2, 34a is a driver of the left channel
speaker 34, 34b is a horn of the left channel speaker 34, 34c. Is the left side opening to the left
side of the television housing 14 provided in the middle of the horn 34b of the left channel
speaker 34, and 34d is the front of the television housing 14 provided at the tip of the horn 34b
of the left channel speaker 34. The front opening provided, the right channel speaker 44
provided on the right side of the CRT 2 and provided inside the television chassis 14, the driver
44 a for the right channel speaker 44, the horn 44 b for the center channel speaker 44, and the
right channel speaker 44 c In the middle of the 44 horn 44b Right side opening to the right side
of the television housing 14 provided, 34d is a front opening provided on the front of the
television housing 14 provided at the tip of the horn 34b of the right channel speaker 34, 54 is
the left and right of the CRT 2 In the center of the direction, a center channel speaker provided
inside the television chassis 14, 54a is a driver of the center channel speaker 54, and 54b is a
horn of the center channel speaker 54.
[0029]
Next, the operation will be described. The audio signal of the left channel is applied to the driver
34a of the left channel speaker 34 via the amplifier for the left channel to generate a sound. This
sound passes through the horn 34b of the left channel speaker 34, a part of which reaches the
viewer 6 through the left side opening 34c and a part thereof through the front opening 34d,
and the sound image is localized in the left direction of the viewer 6 Do. Similarly, the audio
signal of the right channel is applied to the driver 44a of the right channel speaker 44 via the
amplifier for the right channel and a sound is generated to pass through the horn 42b and a part
thereof passes through the left side opening 44c. The part reaches the viewer 6 through the front
opening 44d and the sound image is localized to the right of the viewer 6, and the center channel
audio signal is applied to the driver 54a of the center channel speaker 54 through the amplifier
to generate a sound Then, the viewer 6 is reached via the horn 54b of the center channel speaker
54, and the sound image is localized in front of the viewer 6.
[0030]
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The sum of the distance from the viewer 6 to the front opening 44d of the right channel speaker
44 and the distance from the front opening 44d of the horn 44b to the driver 44a is dlr 4 S, the
distance from the viewer 6 to the right front corner of the television case 14 The sum of the
distance and the distance from the right front corner of the television chassis 14 to the right side
opening 44c of the right channel speaker 44 and the distance from the right side opening 44c of
the right channel speaker 44 to the driver 44a is dlr4L from the viewer 6 Assuming that the sum
of the distance to the opening of the horn 54b of the center channel speaker 54 and the distance
from the opening of the horn 54b to the driver 54a is dc4 and the average of dlr4S and dlr4L is
dlr4a, dlr4a and dc4 become equal. The length of the horn 54b of the center channel speaker 54
Setting the arrival time difference of the viewer 6 of the right-channel sound and center-channel
sound is eliminated by, it becomes possible to reproduce the original stereo sound field.
[0031]
Example 5
9 and 10 show a video and audio reproduction apparatus according to a fifth embodiment of the
present invention. FIG. 9 is a top sectional view, and FIG. 10 is a right side sectional view. In the
figure, 15 is a television case, 35 is a right channel speaker provided on the left side of the CRT
2, 35a is a driver of the right channel speaker 35, 35b is a horn provided on the front of the
driver 35a of the left channel speaker 35, 45 is Right channel speaker provided on the right side
of the CRT 2, 45a is a driver for the right channel speaker 45, 45b is a horn provided on the
front of the driver 45a for the right channel speaker 45, 55 is a center channel speaker provided
below the CRT 2, 55a Is a driver of the center channel speaker 55, 55b is a horn provided on the
front of the driver 55a of the center channel speaker 55 and bent along the CRT 2.
[0032]
Next, the operation will be described. The audio signal of the left channel is applied to the driver
35a of the left channel speaker 35 through the amplifier for the left channel to generate a sound.
This sound reaches the viewer 6 through the horn 35b of the left channel speaker 35, and the
sound image is localized in the left direction of the viewer 6. Similarly, the audio signal of the
right channel is applied to the driver 45a of the right channel speaker 45 via the right channel
amplifier to generate a sound, which reaches the viewer 6 via the horn 45b and reaches the
viewer 6 right The sound image is localized in the direction, and the center channel audio signal
is applied to the driver 55a of the center channel speaker 55 through the amplifier to generate a
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sound, which reaches the viewer 6 through the horn 55b of the center channel speaker 55 for
viewing The sound image is localized in front of the person 6.
[0033]
The sum of the distance from the viewer 6 to the opening of the horn 45b of the right channel
speaker 45 and the distance from the opening of the horn 45b to the driver 45a is dlr5, from the
viewer 6 to the opening of the horn 55b of the center channel speaker 55 When the sum of the
distance and the distance along the horn 55b from the opening of the horn 52b to the driver 55a
is dc5, the length of the horn 55b of the center channel speaker 55 should be set so that dlr5
and dc5 become equal. By this, the difference in arrival time to the viewer 6 between the sound
of the right channel and the sound of the center channel is eliminated. Thereby, the sound field at
the time when the signal source is created can be reproduced by the present video and audio
reproduction apparatus.
[0034]
In this embodiment, although the thing with few bends inside a horn was explained, the same
way of thinking can be applied if the distance is calculated along the path of the sound of a horn
also about the thing with a large inside bend.
[0035]
In the above embodiments, it has been described that the physical distance from the viewer to
each channel speaker is the same, but a better adjustment method is the sound pressure of the
impulse response at the listening position when impulse is applied to each channel Adjust the
horn length of the center channel speaker so that the instantaneous maximum value of is the
same delay.
[0036]
In the above description of the embodiment, the audio of the right channel and the audio of the
center channel have been described. However, the video and audio reproduction apparatus is
generally made symmetrically left and right, and the same result can be obtained for the left
channel.
[0037]
In addition, although the display using a CRT as the image display device has been described, the
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same effect can be obtained with a rear projector, a projector, a liquid crystal display, a plasma
display or the like.
[0038]
As described above, according to the first aspect of the present invention, the video and audio
reproduction apparatus according to the present invention is provided with a horn on the front
of the center channel speaker, and the acoustic distance from the left and right channel speakers
to the viewer and the center Since the acoustic distances from the channel speakers to the viewer
are equalized, it is possible to inexpensively make the arrival times of the left and right channel
audio and the center channel audio equal to the viewer.
As a result, the sound field can be restored by holding the position of the sound targeted by the
software maker.
[0039]
According to the second aspect of the invention, the horn is provided on the front of the center
channel speaker so that the front of the driver of the left and right channel speakers and the
front of the driver of the center channel speaker are acoustically equidistant. The arrival time of
the left and right channel audio and the center channel audio can be made equal to the viewer
inexpensively.
As a result, the sound field can be restored by holding the position of the sound targeted by the
software maker.
Moreover, since the left and right channel speakers and the center channel speaker are the same
type of speaker, the tone can be unified.
For this reason, for example, even when a person moves from right to left while talking, there is
no discomfort due to the change in timbre.
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[0040]
According to the third aspect of the present invention, the horn is provided on the front of the
center channel speaker so that the front of the left and right channel speakers and the front of
the driver of the center channel speaker are acoustically equidistant. The arrival time of the audio
of the channel and the audio of the center channel can be made the same. As a result, the sound
field can be restored by holding the position of the sound targeted by the software maker. In
addition, there is only an opening for the center channel speaker on the front of the television
housing, and the degree of freedom in design is large.
[0041]
According to the fourth aspect of the invention, the horn is provided on the front of the center
channel speaker so that the front of the driver of the left and right channel speakers and the
front of the driver of the center channel speaker are acoustically equidistant. It is possible to
make the arrival time of the left and right channel audio and the center channel audio equal to
the viewer. As a result, the sound field can be restored by holding the position of the sound
targeted by the software maker. In addition, it is possible to match the timbres of the center
channel speaker and the left and right channel speakers while minimizing the sound quality
deterioration of the left and right channel speakers.
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