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JPS63283393

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DESCRIPTION JPS63283393
[0001]
FIELD OF THE INVENTION The present invention relates to a loudspeaker circuit of a television
receiver. A cross-sectional view of a cabinet of a prior art television receiver is shown in FIG. 1
'and 1 are speakers, 2 and 2' are reflectors, and 3 is a cathode ray tube (hereinafter abbreviated
as CRT). Recently, in order to miniaturize a television receiver cabinet, it has become common to
attach a speaker to the side of the cabinet. In this case, since the sound is not directly radiated to
the front, the reflectors 2 and 2 'are provided to emit the sound to the front as shown in FIG. 3 in
order to improve the sound pressure and the directivity. Problems to be solved by the invention
When the speakers are provided on both sides as shown in FIG. 3, the directionality does not
matter so much for relatively low sound of about 500 Hz or less, but 500 to 1 crystal or more
There is a drawback that the sense of localization (directivity) of high frequency sound is unclear
because the sound is sensitive to relatively high sound. SUMMARY OF THE INVENTION In view
of the above-described problems, the present invention is intended to improve the sense of
localization of sound (directivity) without providing a speaker on the side to increase the width of
a cabinet. Means for Solving the Problem The present invention provides a speaker dedicated to
high-pitched sound in the front of the cabinet, and outputs only bass from the speaker dedicated
to bass from the side, and drives both with opposite polarity to define a crossover frequency. In
the above, it is possible to obtain the improvement of the localization and the improvement of the
sound pressure simultaneously. Operation According to the present invention, only the bass is
output from the side speakers, and only the high-pitched sound is output from the front, and the
both are driven in reverse polarity so that they can be heard in phase in the crossover frequency
area. It is possible to prevent a decrease in the sound quality and to improve the sense of
localization. Embodiment 1 FIG. 1 shows a speaker apparatus according to an embodiment of the
present invention. The same parts as those in FIG. Further, FIG. 2 shows the characteristics of
FIG. 1 respectively. A small-sized speaker 4, 4 'exclusively for high-pitched sound is provided on
10-05-2019
1
the front of the cabinet 8. A blocking coil 7.7 'is connected in series to the side speakers 1 and 1'
so as not to emit a high-pitched sound, and a sound of 5 oot-h or less with a small sense of
localization is produced. The front speakers 4, 4 'are connected in reverse polarity to the side
speakers 1, 1'. As a result, the output sound waves of the bass speakers 1 and 1 'are reflected by
the reflecting plates 2 and 2' in the crossover frequency area where the two sounds are summed
up, but the phases are reversed. Because it is driven with the opposite polarity, it can be heard in
phase when it is heard in front, and therefore the sound pressure will not be reduced.
Also, the high-pitched sound comes out from the front speakers 4, 4 ', so that the sense of
localization of the high-pitched sound is improved. Effects of the Invention As described above,
according to the present invention, a small-sized speaker exclusively for high-pitched sound can
be provided in the front to improve the sense of localization and increase the sound in the
crossover frequency area without increasing the cabinet width using side speakers. A constant
sound pressure can be obtained without lowering the pressure.
[0002]
Brief description of the drawings
[0003]
1 is a schematic plan view of a television receiver according to an embodiment of the present
invention, FIG. 2 is a characteristic diagram showing the relationship between sound pressure
and frequency obtained from the speaker of FIG. 1, and FIG. 3 is a conventional example. It is a
schematic plan view showing a speaker drive device.
1.1 ? иииииииииии Side speakers 2, 2 ? ииииииии Wave reflectors 4, 4 ? ииииииииии Front speakers, end 7 ? иииии
High-tone blocking coil, 8 ..... Cabinet. Name of Agent Attorney Nakao Toshio and 1 other person
Fig. 2 ?? ? ? ? 7? ? ? ? Town number chart 3
10-05-2019
2
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