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JPH02257798

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DESCRIPTION JPH02257798
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker system built-in television
set which simultaneously realizes video and audio reproduction. 2. Related Art In recent years,
television sets with built-in speaker systems have been designed to increase the size of video
reproduction screens and improve the sound quality of audio reproduction. Also, in recent years,
in television broadcasting or video images, audio signals are made stereo, and in a television set,
built-in speakers are provided on the left and right sides of a cathode-ray tube to cope with
stereosizing of audio. An example of the above-described conventional speaker system built-in
television set will be described below with reference to the drawings. FIG. 4 shows a conventional
speaker system built-in television set. In FIG. 4, 101. 103 reproduces a stereo audio signal by a
front speaker. 4 is a cathode ray tube, which reproduces an image, 3 is a cabinet, which
incorporates a speaker and a cathode ray tube therein. The video signal to be reproduced is one
obtained by demodulating a television broadcast, or a video input power from the outside, and
the audio signal is also demodulated or input from the outside in synchronization with the video
signal. Video and audio are played simultaneously, and stereophonic audio reproduces powerful
scene effects. When stereo broadcasting is played back with a conventional television set, the
center of the front of the television set is at the same distance from the left and right speakers,
and the reproduced sound pressure levels are the same. A nearly satisfactory stereo feeling can
be obtained. However, when the speaker is biased to the left or right, the sound pressure of the
biased speaker is high, and the distance is short, so that the balance between the left and right is
broken, and the stereo feeling is reduced. In addition, there is also a problem that the spread of
reproduced sound is small because the reflected sound that strikes the side wall of the room is
hardly generated when placed in the actual room to radiate forward. In view of the above
problems, the present invention realizes sound pressure directivity characteristics that make the
reproduced sound pressure of the biased speaker smaller than when listening to it at the center
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when viewing a television biased to the left or right. The present invention provides a speaker
system built-in television set which has a wide listening range in which the sense of stereo is not
impaired and further increases the reflected sound of the side wall to improve the spread of
reproduced sound. Means for Solving the Problems In order to solve the above problems, the
speaker system built-in television set of the present invention is provided with front acoustic
emission surfaces on the left and right sides substantially the same plane as the CRT display
surface for reproducing images. A side acoustic emission surface is provided at a position deeper
than the display surface of the cathode ray tube on both sides of the set side.
Operation According to the above-described configuration, in the center of the television set, the
sound pressure from the side acoustic emission surface is hardly affected because it is blocked
due to the side wall, and the sound pressure from the front acoustic emission surface is well
controlled. You can get a sense of stereo. In addition, in the position that is biased to the left or
right, the sound pressure from the side acoustic radiation surface on the side that is biased and
the sound pressure from the front acoustic radiation surface cancel each other so that the sound
pressure becomes smaller than the central position The sound pressure on the opposite side is
not affected by the sound pressure from the side acoustic radiation surface, so the sound
pressure does not rise due to the approach to the acoustic radiation surface and does not occur
at the off center position. Also good stereo feeling is realized. In addition, the sound radiated
from the side acoustic radiation surface strikes the side wall of the room to create a reflected
wave, and the spread of sound is improved. Embodiment A speaker system built-in television set
according to an embodiment of the present invention will be described with reference to the
drawings. FIG. 1 shows a speaker system built-in television set in an embodiment of claims (1)
and (2) of the present invention. In FIG. 1, 101 ░ 103 are left and right front speakers for
emitting sound forward, and 102 and 104 are side speakers for emitting sound laterally. The
operation of the television system built-in television set configured as described above will be
described below with reference to FIGS. 2 and 3. FIG. 2 is a view showing an acoustic wavefront
10101010 of sound radiated from the front speaker 101 and the side speaker 102 on the right
side, and the side speaker 102 is separated by an angle indicated by a two-dot broken line in the
direction of watching the television set. Range A and B which are not affected by the sound from.
In the range B, the respective phase relationships are adjusted such that the sound pressure from
the front speaker 101 and the sound pressure from the side speakers 102 cancel each other and
the sound pressure in the range B becomes smaller than the range A. Conventionally, when
viewing a television biased to the right, the sense of stereo sound is greatly impaired by the fact
that the sound pressure of the right sound signal is larger than the sound pressure of the sound
sound of the left side. The phenomenon that the sound signal sound pressure is larger than the
sound signal sound pressure on the right side compensates for the decrease in the stereo effect
caused by the rightward bias, and a better stereo feeling can be obtained compared to the prior
art. FIG. 3 shows how the sound emitted from the side speakers 102 strikes the side wall of the
room and reaches the listening position when the television set is placed in an actual room,
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where 10 is the room. The side wall 1021 is a side wall reflected sound by the side speaker.
In addition to the effect of keeping the sense of stereo good by the increase of such reflected
sound, the effect of improving the sense of spread of stereo reproduction sound is obtained. FIG.
5 (a) is an overall view of one embodiment of the claim (3) term of the present invention of the
speaker system built-in type television set, and FIG. 5 (b) is a speaker 12 constituting the front
acoustic radiation surface. FIG. 6 is a cross-sectional view showing the relationship of the
acoustic tube 2; In FIG. 5, 111 and 113 are front sound radiation surfaces on the right and left
sides, respectively. Although 102 is a speaker on the right side, a similar speaker is disposed on
the left side, and the side speakers may be connected by an acoustic pipe as in the front. In the
speaker system built-in television set configured as described above, in the embodiment shown in
FIG. 5, 111 and 113 are sound emission surfaces in the same plane as the display surface of the
cathode ray tube 4 and the sound emitted by the speaker 12 Are collected by the acoustic tube 2
and radiated into space from the acoustic radiation surface 111.113. The same effect as the
embodiment shown in FIG. 1 can be obtained in this embodiment. FIG. 6 shows an embodiment
according to claim (4), in which the flow of signals applied to the front and side speakers of the
built-in speaker system television set shown in FIG. 1 is connected to the final speaker And the
indicated polarity. In FIG. 5, 5 is an antenna, 6 is a tuner, 61 is a video signal line, 62 is an audio
signal line, 8 is a CRT, 7 is a power amplifier of the audio signal, 71 is a positive side power
signal line, and 72 is a negative side power signal It is a line. The operation of the speaker system
built-in television set configured as described above will be described. As described above, it is
necessary for reducing the sound pressure that the acoustic signals emitted by the front speakers
101 and 103 are in a phase opposite to the acoustic signals emitted by the side speakers 102
and 104 at the listening position. . The positive side power signal line 71 which is the output of
the power amplifier 7 is connected to the positive side terminal of the front speakers 101 and
103 and the negative side terminal of the side speakers 102 and 104, and the negative side
power signal line 72 is connected to the opposite terminal By doing so, it is possible to fulfill the
above purpose. FIG. 7 shows an embodiment according to claim 4 and shows the flow of signals
applied to the front and side speakers of the speaker system built-in television set having the
configuration shown in FIG. In FIG. 7, reference numeral 9 denotes an audio signal delay unit.
The operation of the speaker system built-in television set configured as described above will be
described. As described above, it is necessary for reducing the sound pressure that the acoustic
signals emitted by the front speakers 101 and 103 have a phase opposite to the acoustic signals
emitted by the side speakers 102 and 104 at the listening position. .
However, as shown in FIG. 1, when the front speakers 101 and 103 are closer to the listening
position as compared with the side speaker I 02 ░ 104, the front speakers reach the listening
position earlier by a shorter distance. Even if the phases of the sounds radiated by the speakers
101 and 103 and the side speakers 102 and 104 are opposite to each other, the effect of
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reducing the sound pressure by the temporal shift is reduced. As shown in FIG. 7, by amplifying
the delayed audio signal by the power amplifier 7 and applying it to the front speakers 101. 103,
it becomes possible to improve the problem of reaching the listening position as soon as possible
by the short distance. . Note that, by reproducing the delayed signal from the side speakers 102
and 104 in the opposite manner to the present embodiment, the delay of the sound reflected by
the side wall of the room when it is placed in the actual room is further prolonged, and the side
wall is more The effect of being far is realized to increase the confusion of the sound field in the
reproduction. FIG. 8 (a) is an overall view of an embodiment according to the present invention
(6) of the speaker system built-in type television set, and FIG. 8 (b) is a sectional view of the
speaker system incorporated in this embodiment. Figure is shown. In FIG. 8, 21 is a front acoustic
pipe provided on the front of the speaker 12 and constituting a front acoustic emission surface,
and 22 is a rear acoustic pipe constituting a side acoustic emission surface. The operation of the
speaker system built-in television set configured as described above will be described. The
sounds radiated from the front and back of the loudspeaker 12 are in antiphase with each other,
so that the sounds coming from the front and side acoustic emission planes configured via the
acoustic tube 21.22 before and after that are also antiphase Relationship. Therefore, the effect
shown in FIG. 6 can be realized by only one speaker. Effects of the Invention As described above,
the speaker system built-in television set according to the present invention has the front
acoustic emission surface on the left and right sides substantially on the same plane as the CRT
display surface that reproduces an image, and further Since the side acoustic emission surface is
provided at a position deeper than that, in the center of the television set, the sound pressure
from the side acoustic emission surface is hardly affected because it is blocked by the side wall,
and from the front acoustic emission surface It is controlled by sound pressure and a good stereo
feeling is obtained. Also, in the position that is biased to the left or right, the sound pressure from
the side acoustic radiation surface on the side that is biased and the sound pressure from the
front acoustic radiation surface cancel each other so that the sound pressure becomes smaller
than the central position. The sound pressure on the opposite side is not affected by the sound
pressure from the side acoustic radiation surface, so the sound pressure does not rise due to the
approach to the acoustic radiation surface and does not occur at the off center position. Also
good stereo feeling is realized.
In addition, the sound emitted from the side acoustic radiation surface strikes the side wall of the
room to produce a reflected wave, which has the effect of improving the sense of the spread of
the sound.
[0002]
Brief description of the drawings
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4
[0003]
1, 5, 6, 7 and 8 are explanatory views showing an embodiment of a television system built-in
television set according to the present invention and the flow of audio signals applied to each
speaker, and FIG. The figure is a schematic view showing a conventional speaker system built-in
television set, FIG. 2 is an explanatory view showing an acoustic wave front of sound radiated
from front speakers and side speakers, and FIG. 3 is a television set placed in an actual room It is
the conceptual diagram which showed a mode that the sound radiated | emitted from the side
speaker at the time of hitting was reached to the listening position after hitting the side wall of a
room.
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10-05-2019
5
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