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JPS5648194

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DESCRIPTION JPS5648194
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a control circuit diagram according to the
present invention. VH1 is a first variable resistor, VH2 is a second variable resistor, 81 to S is a
changeover switch, C1 is a capacitor for high frequency signal grounding, 1 is a low frequency
sound quality or volume adjustment circuit, 2 is a high frequency component Sound quality or
volume control circuit.
[Detailed description of the invention] 詔? / F '(J42 The present invention relates to a control
circuit of an audio signal, and in particular, a variable resistor for adjusting the tone of high
region at the time of 2 channel signal reproduction, and for volume adjustment of the high region
at the time of 4 channel signal reproduction. It is configured to be used as a variable resistor, and
similarly to use a variable resistor for tone adjustment in the low range as a variable resistor for
volume adjustment in the high range. The details will be described below with reference to the
drawings. The figure shows a signal transmission path for one channel. (1 / RO) is a main volume
1 adjustment variable resistor for adjusting the volume of the entire frequency range of the
signal. (1) is a control circuit for sound quality adjustment or volume adjustment of the low band,
and (2) is a control circuit for sound quality adjustment or volume adjustment of the high band.
(A1) is an amplifier, and (Ax) is an amplifier for tweeter. Now, when the changeover switches (Sl)
to (S4) to be interlocked are set to the 2 channel side, the control circuit (1) becomes a wellknown low-pass sound quality adjustment circuit, and the control circuit (2) is a well-known highpass It becomes a circuit for sound quality adjustment. Then, five speakers (not shown)
connected to the output side of the amplifier (A1) are driven. During two-channel reproduction,
the tweeter amplifier (A2) is not equally driven. Next, when the changeover switches (Sl) to (S4)
are set to the 4-channel side, the control circuit (1) becomes a circuit for adjusting the volume of
the low band, and only the low band signal whose level is adjusted is input to the amplifier (A1)
Be done. Further, the control circuit (2) serves as a volume adjustment circuit for high frequency,
and only the high frequency signal whose level is adjusted is inputted to the tweeter amplifier
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(A), and the tweeter (not shown) is driven. More specifically, the capacitor (Cs) (Cs) is
disconnected from the signal line and the one end of the first variable resistor (YR +) is grounded
since the switch (S +) (am) switches to the four channel side. The first variable resistance in
history! The other end of I (VR +) is grounded via a capacitor (C1). Therefore, the high frequency
signal is reduced, and only the low frequency signal whose level is adjusted is taken out from the
output side of the first town variable resistor (VR,), and the lowest level becomes 0 level. That is,
the control circuit is a circuit for adjusting the sound volume of 4 low bands. The resistor (R +) is
for gain adjustment. On the other hand, when the switch (Ss) (S4) is switched to the 4 channel
side, the high band signal whose level is adjusted from the output side of the second town
variable resistor (VR,) is input to the tweeter amplifier (At). Since one end of the second variable
resistor (VR,) is grounded, the lowest level of the high frequency signal is zero.
The low band signal is cut off by the capacitor (C4). That is, the control circuit (2) is a volume
adjustment circuit for high frequency band. According to the present invention described above,
one control circuit can be used for tone control at the time of 2-channel signal playback and for
volume control at the 4-channel signal playback, which is practical.
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