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JPS4922901

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DESCRIPTION JPS4922901
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram of an example of a 4-channel
stereo decoder, FIG. 2 and FIG. 3 are vector diagrams of its explanation, FIG. 4 is a waveform
diagram of its explanation, FIG. FIG. 6 is a system diagram showing an example of the circuit of
the present invention as a whole of the decoder, FIG. 6 is a connection diagram of an example of
its main part, and FIG. 7 is a waveform diagram for explaining the same. 17, 18, 23 and 24
double wave rectification circuits, 21 and 22 arithmetic units, 19 and 25 comparison circuits, -37
and 38 their input terminals, 39 and 40 their integration circuits, 36 their differential amplifiers
The separators 46 and 47 are rectifier circuits, 48 and 49 are output terminals, 20 and 26 are
combiners, 27 is a subtractor, and 28 is a polarity inverting circuit. Fist-i- real opening 49-22901
(2) Fig. 1 Fig. 2 Fig. 3 one-theta 韓 Y-2 real opening 49-22901 (3) Fig. 4-3- actual opening 4922901 (4) Fig. 6 Fig. 7 "S" s "/ 'S-4-
[Detailed description of the invention] Matrix channel 4 channel stereosis? As one of the systems,
there is an I- thing called a so-called SQ universal system, but its decoder has a phase shift circuit
(11 and (2) that shifts the phase of the composite signal LITt as shown in FIG. 1) · Phase shift
circuit (3) and (4) for shifting the phase of the 49-22901-02 to .11 component signal loss, · ·
Arithmetic unit (5) for computing the outputs of the circuits (1) I and (3) , And an arithmetic unit
(6) for calculating the outputs of the circuits (2) and (4), to obtain four demodulation signals LF'LB ', RB' and RF 'as shown in the figure. ing. In this case, gain control multipliers (7) to cI5 are
inserted in the transmission lines of the respective demodulated signals, and for example, they
are obtained from the synthesized signal and the phase shift circuit (3) obtained from the phase
shift circuit +1). To the logic circuit a ', and in the circuit 0' on the basis of the two synthesized
signal characteristics and RT, the magnitude of the signal LP corresponding to the left front and
the signal 几 F corresponding to the right j front It is detected which one of the difference
between the magnitude and the difference between the magnitude of the signal LB
corresponding to the left rear and the magnitude of the signal RB corresponding to the right rear
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is how thick [phi], and when the former difference is large, the demodulated signal LF 'And RF'
levels are large p, and conversely, when the difference between the latter is large, the gains of the
multipliers (7) to aa are controlled to increase the levels of the demodulation signals LB 'and 几 B'
I try to give a feeling. In the prior art, specifically, as shown in FIG. 2, let the signal obtained from
the circuit (1) '1 (2) 49-22901-03 be LT' and the signal f obtained from the circuit (3): RT /
When the binary signal LT 'and RT & are separately double-wave rectified to obtain the
difference between the 11-rectified output, the difference between the magnitude of the signal
Lp and the magnitude of the signal Rp is detected, while the combined signal LT / and As shown
in Fig. 3 by computing RT ', another two synthetic signals X and Yt and two equal signals X and Y
are separately double-wave rectified, and the signal is obtained by taking the difference between
both rectified outputs. The difference between the magnitude of LB and the magnitude of signal
RB is detected. That is, as apparent from the solid line in FIG. 2, the signal RB in the signal LT
'and the signal RB in the signal RT / are in phase and at the same level, and the signals I and B in
the signal Li2 and the signal 几 T' Since the signal LB is in antiphase and at the same level, the
components of the signals RB and LB are canceled by taking the difference between the twowave rectification output of the signal LT 'and the two-wave rectification output of the signal RT'.
The difference between the output and the two-wave rectification output of the signal RF, that is,
the difference between the magnitude of the signal Lp and the thickness of the signal RF can be
detected. If the difference from the output is taken, the components of the signals Rp and LP are
canceled and the difference between the double-wave rectified output of the signal LB (3) 4922901-04 and the double-wave rectified output of the signal RB, ie, the signal LB And the
difference between the magnitude of the signal hB and the magnitude of the signal hB.
However, it is possible to detect in this way if the signals LB and) LB and the signals LP and Rp
do not contain any cross-talk components relative to one another and are not correlated with one
another. is there. That is, in many cases, the signals LB and RB, and the signals Lp and RF each
have a crosstalk component on the other side 9, thus the signal periods and signals in the signal
LTI as shown by the broken lines in FIG. At the same time, 傷 BU in RTZ. And the phase
difference between the signal LB in the signal Li2 and the signal LB in the signal Li2 is smaller
than 180 °, and the signal in the signal X is shown by a broken line in FIG. The same applies to
Rp and Lp and the signals kLp and Lp in the signal Y. Therefore, even if the difference between
the double-wave rectified output of the signal LT 'and the double-wave rectified output of the
signal RT' as described above, the components of the signals RB and I, B are not canceled out.
Similarly, the difference between the two-wave rectified output of the signal X and the two-wave
rectified output of the signal Y is obtained, but the components of No. 46 RP and LP are not
killed by phase (4). For example, signal 1. If the same signal components in the signals TI and TI
and in the signals X and Y have a phase difference of 90 ° as shown in FIG. 4A, the difference
between the respective two-wave rectified outputs is as shown in FIG. As shown by Mlml, the
triangular wave does not become p zero. Therefore, the above-described method can not reliably
detect the difference between the magnitude of the signal LF and the magnitude of the signal 几
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F or the difference between the thickness of the signal thin and the magnitude of the signal 几 B.
The present invention is able to reliably detect the difference between the magnitude of the
signal LP and the magnitude of the signal RF and the difference between the magnitude of the
signal Lf3 and the size of the signal RB from these points. An example of the circuit of the
present invention will be described below with reference to FIG. FIG. 5 shows an example of the
circuit of the present invention together with the part of the decoder, and Qz as a whole is .sigma.
In the present invention, the two composite signals described above. -Rl and RTI are also twowave rectified each of two other composite signals X and Yl, and each rectified output is
integrated respectively to obtain a difference signal of opposite polarity to each other of this each
integrated output, this reverse to each other 7) Rectify the difference signals of the '49 -2290161 I polarity respectively, combine the respective rectified outputs, and make ii. More
specifically, the synthetic signal LTp obtained from the phase shift circuit (1) described above
and the synthetic signal 几 T 'obtained from the phase shift circuit (3) are connected through the
equalizers Q3 and I, respectively, and the automatic gain control amplifier a $ and ae are
respectively taken out and supplied to the two-wave rectifier circuit Q7) and Qe, respectively, the
output thereof is supplied to, for example, a special comparison circuit 0 of the two-handed-twooutput type, and the two outputs to the combiner. Synthesize.
One hand amplifier (1! The synthesized signal LT / and the suppression obtained from 9 and Qe
are respectively calculated by the operation unit c! ll and s to obtain the other two composite
signals X and Y mentioned above, respectively, which are supplied to the double wave
rectification circuit, on the path and on the-respectively, and the output thereof is compared with
the comparison circuit (2). It is supplied to a comparator circuit of the same configuration, and
the two outputs are synthesized by a synthesizer @. Then, at the subtracter @, for example, the
output of the combiner-is subtracted from the output of the combiner ·, and the outputs thereof
are controlled by the amplifiers (7) and (1 (Ik supply to control the gain of the The output of the
circuit is supplied to amplifiers (8) and (9) through a polarity inverting circuit @ to control its
gain. Note that the outputs of (6) 4g-22901-07 @ of the both-wave rectifier circuit anas and (6)
4g-22901-07 are synthesized by the synthesis circuit 411, and the gains of the amplifier aS and
Qe are controlled by the output. Here, the comparison circuit The alpha field and the shadow are
configured as shown in FIG. That is, a series circuit of a resistance island and a bird is connected
between the transistor (2) and the glossy emitter, and the connection point of the equal
resistances R1 and R3 is further variable resistor via the collector / emitter of the transistor C11
+ as a constant current source. Connected to the negative power supply, and the collectors of the
transistors (Su) and (ii) are connected to the positive power supply through the resistance port
and (Su) respectively, and a constant voltage circuit (T) is connected to the base of the transistor
C311. Connect to form a differential amplifier country. Then, the input 趨 67) and (接 続) are
connected to the bases of the transistor and ■ via an integrating circuit (2) composed of a
resistor R1 and a capacitor C1 and an integrating circuit composed of a resistor R4 and a
capacitor C 夫 respectively. And collector (t) and collector t-F of ω) JPF *) through the bases e-
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collector of Lansister 2 and I respectively NPFJ) 57) xl '41 B- and (c) 0'-'・ 2t transistor and (ha)
emitter IIJII! i! Deriving outputs mw and-respectively through circuit 1, self-and-, respectively
"(7) 49-22901-08. Note that the resistor and 6 ト ラ ン ジ ス タ are connected between the
emitter of the transistor and the base of the transistor 帥 and between the emitter of the
transistor (3) and the base of the transistor ■, respectively, The feedback is applied to the base
of the transistor (2) from the collector of the transistor 2 respectively. Accordingly, in the
comparison circuit block 9, the double-wave rectified output of the signal LT / obtained from the
circuit aD is supplied to the human power unit 69, and the double-wave rectified output of the
signal rod 'obtained from the circuit u8 is supplied to the input ys. In this case, each rectified
output is integrated as shown by the integration circuit (2) and the curve indicated by the solid
line in the off state, and the respective integrated output is supplied to the transistor and the
base of the mountain. The integrated output (LT ', l is subtracted (RT')-(LT ') of the double-wave
rectified output of the signal LT' from the integrated output (pieces') of the double-wave rectified
output of the signal RT / The signal of (LT ')-[suppression] of the opposite polarity is obtained at
the collector of the transistor glazing.
Here, as is apparent from FIG. The integral output of TI's two-wave rectified output [(8) 4922901-09 is the sum of the integral outputs of the two-wave rectified output of signals Lp, RB,
LB, and the same applies to the integral output. The signal R in signal and the signal R in signal
are at the same level, and the same applies to signal LB. The integration output of the both-wave
rectified output of the signal RB in the signal LTj and the integration output of the both-wave
rectified output of the signal in the signal control are equal and signaled regardless of the phase
difference with RB. Similarly, in the collector outputs of the transistors (2) and (7), the
component due to the #i signal kLB and the component due to the signal LB are offset, and
eventually the collector of the transistor 4 integrates the two-wave rectified output of the signal
顯Output (RF) to signal LP The integral output (LP) of the wave rectified output is subtracted
["P"-(LF) to obtain a difference signal, and the collector of the transistor フ タ has an opposite
polarity (LP)-["F". Signal is obtained. Therefore, a signal of (LP)-(BP) is obtained at the emitter of
the transistor, and (? )-(LP) is obtained. That is, signals of opposite polarities are obtained at the
transistor and the four emitters, which indicate the difference between the magnitude of the
signal '4g-2290'1-10 Lp and the magnitude of the signal. Therefore, when the magnitude of the
signal LP is larger than that of the signal 几 F, that is, when (LF)-(RF) is positive, a positive signal
having a magnitude corresponding to the difference is obtained at the output end through the
circuit. Conversely, when the magnitude of HF is larger than that of the signal LP, that is, when
(RF)-(LP) is positive, a thick stone positive ( No. 8 is obtained. Therefore, the signal obtained from
the two output ends 14 & of this comparison circuit U and the old is threatened in the
synthesizer (d) by the difference between the magnitude of the signal Lp and the magnitude of
the signal Rp rather than the synthesizer @. A signal of magnitude corresponding to the value is
obtained. On the other hand, the same applies to the comparison circuit 6 and the synthesizer ω
side, and in the comparison circuit □□□, a double-wave rectified output of the signal X
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obtained from the circuit is supplied to one input end face, and the other input end @ By
combining both waves of the signal Y to be obtained by t-complementing the combiner Y, the
signal (1) A signal having a magnitude corresponding to the absolute value t149-22901-11 of
the difference between the magnitude of H and the magnitude of the signal 顯 is obtained.
Therefore, when the absolute value of the difference between the magnitude of signal Lp and the
magnitude of signal RF is larger than the absolute value of the difference between the magnitude
of signal LB and the magnitude of signal RB, the output of the subtractor surface becomes
positive and the output of circuit @ is ^ Amplifier (7) and (1 (the gain of l is large and the gains of
Isf 81 and (9) are small and the levels of signals LF 'and .F') are large, and conversely the
magnitude of signal LB is large. When the absolute value of the difference between the
magnitude of the signal RB and the magnitude of the signal RB is larger than the absolute value
of the difference between the magnitude of the signal Lp and the magnitude of the signal
distortion, the output of the subtractor surface becomes negative and the output of the circuit 4
becomes positive and the amplification (7) and the gain of Ql is small and the gain of amplifiers
(8) and (9) is large, so that the levels of signals LB 'and Sho' become large.] It will be. In the
comparison circuits 0 and G, the signal obtained at the transistor battle and the four emitters is
sliced by the Ill channel and the +471 diode and (4), so that the variable resistor − is IIII. By
adjusting the level of the signal obtained at the transistor and the emitter of the transistor by
m1ll, when there is a monaural signal of 49-22901-12. The synthesizers 7 and 7 can be designed
so that no output can be obtained. As described above, according to the circuit of the present
invention, the difference between the magnitude of the signal LP corresponding to the left front
and the magnitude of the signal Rp corresponding to the right front and the magnitude of the
signal LB corresponding to the left rear and the signal 14 corresponding to the right rear The
difference between the magnitude and the magnitude can be detected with certainty, and the
level control of the y4 signal is performed stably.
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