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JP2000184491

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DESCRIPTION JP2000184491
[0001]
TECHNICAL FIELD The present invention relates to a television receiver, a display device and the
like.
[0002]
2. Description of the Related Art Recently, a sound reproducing apparatus has been proposed
which corrects an audio signal using a microphone as described in JP-A-7-22276 and JP-A-7162990. The configuration of JP-A-7-22276 detects a sound signal emitted from a speaker by a
microphone, and an output signal of a subtractor connected to an input terminal by an adder /
subtracter through a microphone amplifier and an output signal of the microphone amplifier And
adding / subtracting processing to stabilize the feedback circuit. The configuration of JP-A-7162990 is the same as the configuration of JP-A-7-22276 described above, except that the sound
conduit is connected to the front of the speaker and the microphone disposed close to the front
of the diaphragm of the speaker. It is a thing.
[0003]
However, the frequency range of the acoustic characteristic to be improved is limited by the
above technology alone, and a stable characteristic without distortions can not be realized in the
entire frequency band. Application was difficult. Further, in the television receiver, the problem
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1
of shaking the shadow mask of the CRT due to the vibration of the speaker has always been a
problem, and can not be solved only by the above-mentioned technique.
[0004]
The television receiver according to the present invention solves such conventional problems and
achieves stable characteristics without dripping in all frequency bands, and suppresses the
vibration from the speaker to the shadow mask while maintaining the sound quality. Is what
makes it possible.
[0005]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention comprises an acoustic reproduction having a microphone in a sound conduit, an
amplifier for amplifying the output of the microphone, and an adder / subtractor for adding the
signal thereof. The apparatus has a filter circuit for extracting only a specific frequency, and is
provided with means for applying only the extraction signal to a speaker attached to the center
of the cabinet.
[0006]
Furthermore, by negatively feeding back only the signal of the speaker's resonant frequency by
an acoustic reproduction device having a microphone in the sound conduit and having an
amplifier for amplifying the microphone output and an adder / subtractor for adding the signal.
It was configured to damp the vibration transmission to the cabinet.
[0007]
With the above construction, the present invention can reproduce the frequency range of the
required acoustic characteristics and prevent the CRT shadow mask from swaying due to the
speaker's vibration.
[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first invention of the present
invention is a sound reproducing apparatus having a microphone in a sound conduit and an
amplifier for amplifying the microphone output and an adder / subtracter for adding the signal
thereof, and By having a filter circuit for extracting only a specific frequency and having means
for applying only the extracted signal to a speaker mounted at the center of the cabinet, it is
possible to reproduce the frequency range of the required acoustic characteristics.
08-05-2019
2
[0009]
The second invention is a sound reproducing apparatus having a microphone in a sound conduit
and an amplifier for amplifying the output of the microphone and an adder / subtracter for
adding the signal thereof. Negative feedback can dampen vibration transmission to the cabinet.
Hereinafter, the television receiver of the present invention will be described with reference to
the drawings.
[0010]
(Embodiment) FIG. 1 shows a principle configuration diagram of a television receiver according
to an embodiment of the present invention.
In FIG. 1, reference numeral 1 is a speaker, 2 is a horn, 3 is a microphone and is fixed to the
inside of the horn 2.
The sound from the speaker 1 has the characteristic of repeating the peak and the dip by the
front room effect of the horn 2, but the output of the microphone 3 is amplified by the
microphone amplifier 6 and the characteristic necessary for the adder / subtractor 7 Is extracted
and fed back to the front stage of the power amplifier 4 to select flat characteristics, but since the
phase changes with the frequency in the microphone, correction of acoustic characteristics up to
around 1 kHz is made to correspond in the above operation.
[0011]
It is possible to improve the acoustic characteristics of the entire band by outputting the L + R
signal 10 to the center speaker 8 mounted at the center of the cabinet by emphasizing only 1
KHz or more through the filter circuit 9.
[0012]
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3
The above operation will be described with reference to FIGS. 2 and 3.
FIG. 2 shows the frequency characteristics before correction.
In the figure, reference numeral 11 represents the sound pressure characteristic, which is the
effect of the horn 2, and is a characteristic of many peaks and dips which repeat tube resonance.
Here, when looking at the frequency characteristic diagram 3 after correction, a substantially flat
sound pressure characteristic 12 is obtained. A feedback circuit corrects the output of the
microphone up to around 1 kHz so that it can be stably fed back, and a flat characteristic is
realized to the range of 12a, and the range of 12b is achieved by using a center speaker that
extracts only the midrange component of L + R. Realizes even flat characteristics.
[0013]
The arrangement of the present invention is capable of improving the acoustic characteristics of
the entire band. Also, by adding only the resonance frequency at which the vibration amplitude
of the speaker is maximum in the adder-subtractor 7, the output from the microphone 3
increases accordingly as the volume is raised, and through the adder-subtractor 7, Only the
resonant frequency can be deleted in proportion to the volume increase. FIG. 4 shows an example
of the frequency characteristic in which the vibration countermeasure is taken by the present
invention. In the figure, reference numeral 13 is a sound pressure characteristic, and the level
only in the vicinity of the point 13a of the resonance frequency of the shadow mask decreases,
and this decreases accordingly as the volume is raised. Therefore, transmission of only the
resonance frequency to the shadow mask of the CRT can be suppressed without losing the sense
of sound pressure in the low frequency range. This effect can mitigate CRT shadow mask swing.
[0014]
According to the television receiver of the present invention, it is possible to improve the
required acoustic characteristics over the entire frequency band. In addition, vibration
transmission to the cabinet is suppressed, and the shadow mask of the CRT is also relaxed.
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4
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