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DESCRIPTION JPS61238197

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DESCRIPTION JPS61238197
[0001]
INDUSTRIAL FIELD OF INVENTION The present invention relates to television broadcasting and
video tape recorders. The present invention relates to a speaker system for reproducing audio
such as a video disk. 2. Description of the Related Art In recent years, loudspeaker systems have
increasingly been used with video as their audio output. Hereinafter, an example of the abovementioned conventional speaker system will be described with reference to the drawings. FIG. 2
shows a circuit diagram of a conventional speaker system. In FIG. 2, 1 is an input terminal and 2
is a speaker. The two speakers are directly connected to the input terminal 1. The operation of
the speaker system configured as described above will be described below. First, the signal
applied to the input terminal 1 is added to the speaker 2, and a sound wave proportional to the
signal is reproduced. Problems to be solved by the invention However, in the configuration as
described above, when the noise of 15 or 75 KHz, which is the horizontal oscillation frequency of
the television, is mixed in the signal to be added, a sound wave proportional to the applied signal
is generated As a result, the 15.75 KHz noise is reproduced as it is, and there is a problem that
the S / N ratio is deteriorated. In view of the above problems, the present invention provides a
speaker system which reproduces a high S / N ratio by removing this noise even if 15.75 KHz,
which is the horizontal oscillation frequency of a television, is mixed in an input signal. It is a
thing. Means for Solving the Problems In order to solve the above problems, the speaker system
of the present invention comprises a coil and a capacitor connected in parallel thereto, and the
resonance frequency thereof is 15.75 K) z. It has a configuration. In the present invention, even if
a noise voltage of 15.75 KHz is applied to the input terminal according to the above-described
configuration, the resonance of the coil and the capacitor connected in parallel with it causes a
high impedance, and hence 15.75 K) The noise voltage of z drops, and the noise of 15.75 KHz is
hardly reproduced from the speaker, allowing a high S / N ratio reproduction. Embodiment A
speaker system according to an embodiment of the present invention will be described with
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reference to the drawings. FIG. 1 is a circuit diagram of a speaker system according to an
embodiment of the present invention. In FIG. 1, 1 is an input terminal, 2 is a speaker, 3 is a coil
connected between the input terminal 1 and the speaker 2, and 4 is a capacitor connected in
parallel to the coil 3. The operation of the speaker system in which (H) and the capacitor value c
(ir) are configured as equation (1)% equation% or more will be described below with reference to
FIG.
The impedance of the speaker 2 as viewed from the input terminal 1 is a very small arrow at
15.75 KHz which is the resonance point due to the parallel resonance of the coil 3 and the
capacitor 4, and the input terminal 1 has 15.75 K) 72 Even if a noise voltage is applied, almost
no current flows in the speaker 2, so that the noise of 15.75 K) h from the speaker 2 is hardly
reproduced. Further, at frequencies other than the resonance point, the parallel impedance of the
coil 3 and the capacitor 4 has a small value, and the voltage applied to the input terminal 1 is
directly applied to the speaker 2 and hence reproduction can be performed in proportion to the
input signal. As described above, according to the present embodiment, the coil 3 and the
capacitor 4 connected in parallel to the coil 3 have a resonance frequency of 16 ░ 75 K h, which
is the horizontal oscillation frequency of the television. 15.75 K) 4z noise can be removed to
achieve high S / N ratio reproduction. Although the speaker 2 is a full range type in the
embodiment, the speaker 2 may be a multiway of two or more slots. Also, in the case of the multiway, the coil 3 and the capacitor 4 connected in parallel to it may be inserted in series or in
parallel just before the unit that regenerates a moth at 15.75. Effect of the Invention As described
above, the present invention eliminates the noise of 15.75 K) lz, which is the horizontal
oscillation frequency of the television, by providing a coil having a resonance frequency of 15
and 75 KHz and a capacitor connected in parallel thereto. , High S / N ratio can be reproduced.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a circuit diagram of a speaker system according to an embodiment of the present
invention, and FIG. 2 is a circuit diagram of a conventional speaker system.
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