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JPS4945503

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DESCRIPTION JPS4945503
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are each a circuit diagram of each
example of a conventional signal separation device, and FIG. 3 is a circuit diagram of one
embodiment of the device of the present invention. 1 · · · Input terminal, 2 · · · L channel output
terminal, 3 · · · R channel output terminal, 4 · · · Switching circuit, 5, 6 · · · ... Resistor filter, Tr1,
Tr2 ..... L and R channel signal amplifier, Tr3, Tr4 ..... Isolation control transistor, vR3, ■ R4 .....
Adjustable resistance for adjustment. Di figure na Zf) -5-49-49 503 (2) years of age 5 figure-6-
The present invention relates to a stereo signal separation apparatus in a stereo demodulator of
switching type, wherein an L channel signal and an R channel signal passed through a switching
circuit are used as a seventh amplifier. After amplifying and guiding to the output terminal, the
signal of each channel is amplified by the λth amplifier, and a part of it is added to the first
amplifier of the different channel to remove the crosstalk component and to separate. It is an
object of the present invention to provide a stereo signal separation device which can perform
stereo signal separation at a high frequency. First, a conventional example of this type of
apparatus will be described with reference to FIGS. 1 and 1. In FIG. 7, reference numeral 1
denotes a signal input terminal, and the signal applied to the terminal is added to the switching
circuit, where an L channel signal (hereinafter referred to as signal) and an R channel signal
(hereinafter referred to as R signal) And separated. The L signal is applied to the transistor T, 10
base through the low pass p wave j, and the amplified signal is taken out from its collector and is
conducted to the L signal output terminal via the coupling capacitor C □ ( 2) Apply 49-4550303. Similarly, the R signal is applied to the base of the transistor T2 @ 0 through the low-pass pwave circuit, the amplified signal is taken out from its collector% 2, and the R signal output
terminal 3 via the coupling capacitor C2. Led to なおR□∼R4はトランジスタT、□。 The bias
resistance of T, 'Rf, + R7 is an emitter resistance, and 2R5 # Rs is a load resistance. In this circuit,
the stomach stalk component of the L signal and the R signal is largely canceled by the variable
resistor VR. If the crosstalk ratio in the input signals of the transistors Trl, Tf, 2 is different from
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each other, the variable resistance VRt-adjustment is made so as to minimize the crosstalk
occurring in the transistor T2 □, and the cross talk component of the transistor T2 □ is
minimized. Conversely, if the IIC adjustment is made to minimize the four-stalk that occurs in the
transistor .tau.r2, the transistor T, .quadrature.-stole component of the transistor T, .quadrature.
It's hot. Also, a circuit for eliminating four-strokes or a low-pass p-wave device The input / output
impedance "49-45503-04 of the p-wave device is cold depending on the frequency, and
cancellation of crosstalk can not be sufficiently performed at the post-stage of the p-wave. It is
difficult to obtain high separation due to the influence of
Thus, in this conventional circuit, the entire audio frequency range FEE2) It is difficult to obtain
high resolution in both L and R channels over K. The first figure of ti shows another conventional
example, the collector of the transistor τ2 □ is connected to the emitter of the transistor T, 2
via the variable resistor VR, and the collector of the transistor T, 2 is via the variable resistor VR2
It is connected to the emitters of the transistors T, l. Low-pass p-wave devices are the R and R
signals obtained from the sliding terminals of the variable resistors VR1 and VB2. , 6 to the
output terminals-and 3 respectively. なお#! The same reference numerals as in FIG. 7 denote
the same parts in FIG. In this circuit, a high degree of separation can be obtained by adjusting the
variable resistors VR □ and VB2, but there is a drawback that the output signal can not be large
when the input signal is small. (4) 49-45503-05 The present invention eliminates the abovementioned drawbacks, and will be described with reference to the accompanying drawings. FIG.
3 shows a circuit diagram of an example of the circuit of the device of the present invention. In
the figure, the L signal from the switching circuit is amplified by the transistors r and
.quadrature., And then all the low band p wave (or band off wave) S is led to the terminal-, and
the R signal is the transistor Tr2. , And then led to the terminal 3 through the low pass offshore
wave (or building p wave) 6. At the same time, the L signal from the switching circuit l is
separated by the capacitor C5. An output applied to the transistor T, 30 base constituting the
tuning circuit and taken out from the collector thereof is applied to the transistor T, 20 base for
amplifying the R signal through the capacitor C6 and the variable resistance VR4 for adjusting
the isolation. Ru. Similarly, the R signal from the switching circuit 41 is applied to the base of the
transistor T0 which makes the isolation adjustment circuit * g via the capacitor 04, and the
output taken from the cholera is a capacitor C5 and a variable for isolation adjustment. A resistor
VR is added to the pace of (5) 49-45503-06 transistor T, □ for L signal amplification. R9 to R12
are transistors T75. The bias resistance of τ 74, R and R are its emitter resistance, and
R15e11415R is the load resistance. In the above configuration circuit, a transistor? , □) A signal
of L + ΔR and a signal of R + ΔL are respectively added to the base of Tr2, and since ΔR and
ΔL can be independently adjusted by the variable resistor VR3yvR1, sin is performed to
minimize each stomach stalk component be able to.
That is, the crosstalk (R channel) appearing on the base side of the transistors T and □, the
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crosstalk appearing on the collector side of the transistor Tr5, the four strokes (L channel), and
the crosstalk appearing on the pace side of the transistor T The L channel) and the crosstalk
component (R channel) appearing on the collector side of the transistors T and 4 are added to
each other, and the crosstalk components can be canceled each other by the voltage dividing
ratio of the adjustment variable resistor VR3rVH2. In the circuit of the first figure, the input /
output impedance of P wave device 3 ° '49-45503-07 is changed by the frequency, so there is a
defect that the frequency characteristic is affected, according to the circuit of the present
invention Are in the post stage, and variable resistors VR, VR. Is inserted in the output circuit of
the transistor T'r and another part molecule 1 * r2, such a drawback is eliminated. In addition,
low-pass single wave! The insertion characteristic of the single wave device does not affect the
degree of separation because it is inserted in the subsequent stage of the degree of separation
adjustment circuit. Since the above circuit takes out the L signal and the R signal directly from
the collector of the amplifying transistor TT at t ±, the sufficiently large output signal can be
taken out even when the input signal is small. As in the above Y, according to the stereo signal
separation device of the present invention, stereo signal separation can be performed with high
φ separation without changing the frequency characteristics due to input / output impedance,
and a good output signal can be obtained even with a small input signal. It has the features of
being obtained. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are each a circuit
diagram of (7) 49-45503-08 of the conventional signal separation device, and FIG. 3 is a circuit
diagram of an embodiment of the device of the present invention. It is. /-· Medium input terminal
1.2 轡 · · L channel output terminal, 3 ·-Rf canle output terminal, t · · · switching circuit,! , 6 o low
pass P wave device, TrllT, 2 ++ ee L and R channel signal amplifiers, Tr5. Trll · · 9 isolation
adjustment transistors, VR, VR4 · 0 · isolation adjustment variable resistor. Utility model applicant
applicant Victor Company of Japan Victor Co., Ltd. Attorney Attorney Ito Tadahiko (8's 49-4553109 B S B 45 Rs C, 4 g., Trf 2 Tr 15, RIR 2 c R 2 R 2 CC 2 R 7 R Toro "B 26 J 10 Be 10 B R + T ? t
Heart f6 / VR 5754 4 RI 6 'J Tr 2 C! B49-45503-10,-rz / '= 1 (J'J, l <q471-(rHy, thousand)
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