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JPS5146301

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5146301
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block circuit diagram for explaining the prior
art and the present invention, FIG. 2 is a circuit diagram showing one embodiment of the present
invention, and FIG. is there. In the figure, 5 is a low pass filter circuit, 6 and 7 are high pass filter
circuits, 10 is a composite circuit, 13.14 is a frequency detection circuit, 15.16.18 is a gate
circuit, and 17 is a muting signal generation circuit The reference numeral 19 denotes a lance 25
an input terminal, 26 denotes a transistor, 37.44 denotes a capacitor forming a time constant
circuit, 42 denotes an output terminal, and 43 denotes a resistor forming a feedback circuit. 1-15 1-46 301 (2) Fig. 2 (Fig. 3) (A) I rule (B) "K" = "j" at city m ... ■■ 什 0 → t → (C) ÷ 舟 (D ) (◆)
■. l, +1 '· · Iυ2-
DETAILED DESCRIPTION OF THE INVENTION In this study, the transmission path of the signal is
made conductive only when the signal to be reproduced arrives, and in other cases the signal for
generating the transmission path is generated. The present invention relates to a switching signal
generation circuit. In recent years, different signals belonging to the audio frequency band are
placed on the two transmission paths to obtain so-called two-channel stereo effect, and one of the
two transmission paths also belongs to the sound WR local frequency band. The signal plus
another signal that belongs to the audio frequency band is a signal obtained by adding the audio
frequency band to the nadir, 111 ["tl14 L'ft-@ @ & '* * A (D # 1. mlEMlffm & + lil for the signal A
stereo reproduction apparatus can be seen that can obtain a four-channel stereo effect by
performing f / number detection at a later stage. A schematic block diagram of this stereo
reproduction system is as shown in FIG. 1 (2). That is, in FIG. 1, 1 is a turntable, 2 is a record
board for stereo mounted on the turntable 1, 3 is a signal recorded on the record board 2
converted into an electric signal to be two pieces. Of the signal components supplied from
transmission @ LL and L 2, the hitch-up sent to the transmission paths L 1 and L 2 sounds the
equalizer characteristic for frequencies below IKH 2, and for frequencies above I KHz, commuting
to work as it is First equalizer circuit. 5 is a low pass filter circuit, 6 and 7 are high pass filter
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circuits respectively, and the low pass filter circuit 5 passes a frequency of 20 KHz or less among
the output signal components of the first equalizer circuit No. Band filter circuit6. In each case,
the frequency of at least 20 KH2 is allowed to pass. Accordingly, here, the two output
transmission lines L1 and L2 of the first equalizer circuit number are divided into four
transmission lines 11 ° 12.15.14. 8 is the transmission line / l. Among the signal components
supplied from 12, the equalizer characteristic is shown for (3) frequencies higher than rKlIZ, and
the Aff numbers smaller than IKHjl are allowed to pass as they are, and all are combined with the
first equalizer circuit number. It is a second equalizer circuit that obtains equalizer characteristics
with respect to the frequency mK. 9 is an amplification circuit for amplifying the signal from the
second equalizer circuit 8, and 10 is a composite circuit to which a signal is supplied from the
amplification circuit 9 through a separation-adjustment variable resistor 11.12. 13.14 is the high
frequency band circuit respectively 6. When a frequency modulated high frequency signal is
supplied from the Z frequency signal, the signal is subjected to frequency f I number detection
and converted to a voice frequency band signal) @ wave number detection circuit, 15.16 are
respectively supplied from the frequency detection circuit 13.14 Do you want?
It is a gate circuit for muting to control the turn 4 of No. 1. The output signals of these gate
circuits 15.16 are supplied to the composite circuit lO. Reference numeral 17 denotes a muting
signal generation circuit for turning on the gate circuit 15.16 and the four-channel display lamp
19 when a signal is supplied from the high-pass filter [8iJ path 6]. Each gate circuit 18 is
supplied with a gate signal. Reference numerals 20, 21 and 22.23 denote output terminals of the
complex times & lO, respectively. In the circuit of the above configuration, if the record board 2
is for two-channel stereo, the audio frequency band signal generated in the transmission paths
L1 and L2 is the first equalizer circuit number, the low pass filtered U path 5 , The second
equalizer, & 8, the field line circuit 9, and the variable resistor 11.12, respectively, and then the
composite circuit 10 is supplied to the composite circuit 10. I corresponding to the left and right
amount is output. In this case, high frequency 18! The circuit 6 avoids all the signals supplied
from the first Nocolaris circuit number, so that the gate circuits 15, 16 and 18 are not supplied
from the muting signal generation circuit 17 and noise is not generated. If the signal is prevented
from being input to the composite circuit 10, the lamp 19 is not turned on also in (5). Somehow,
there are not a few high frequency components of 20 kHz combined with the book in the signal
for two-channel stereo, and the frequency characteristic of the high-pass filter circuit 6 is ideal
also for signal frequency components below 20 KHz Can not be obtained, so a high signal level
passes through the high-pass filter circuit 6, and at that time, the gate signal is supplied to the
gate circuits 15 and 16 ° 18 from the mutein code generation circuit 1 w Since the signal is
output, a noise signal may be supplied to the composite circuit 10 or the lamp 19 may be turned
on, which may cause a desirable operation. Also, if the record board 2 is for four channels, the
people of the transmission paths Li and L2 may use one signal belonging to the audio frequency
band and another signal belonging to the voice cancellation / disappearance signal with the
signal of 30 KH 21. After the frequency-modulated signals are generated and the signals
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respectively pass through the first equalizer circuit number, the high-pass filter circuit 6.7 (6)
detects the frequency 18! The circuits 13 and 1 are detected and then supplied to the gate circuit
15.16. On the other hand, since the output signal of the cylindrical filter circuit 6 is also supplied
to the muting signal generation circuit K17, the muting signal generation circuit & 41'7 outputs a
cut signal to the cut circuit 15 or 16.18, The detected signal passes through gate circuits -15 and
16 to be supplied to the composite circuit 10, and the run 119 is also displayed as a four-channel
display.
By the way, the above-mentioned 301 EsVC signal-a signal is inscribed in the groove of the
record board 2 together with the signal of the voice frequency empire, for example, the record
board 2 is curved and is lost, or the autopsy voice Mltl band In the case where the signal A has a
large amplitude, the momentum of the trace needle becomes unreasonably large, and it may not
be possible to trace the signal which has been changed at 1c3 oxHz. Therefore, the signal level
output from the high-pass filter circuit 6 is bored at this i-time, and the muting signal generation
circuit 17 is a gate circuit 15, The gate signal can not be supplied to 16.18, and the detected
signal can not pass through the gate circuit 115.16, and the lamp 19 does not light. An object of
the present invention is to provide a muting signal generation circuit l #-/ il- which eliminates the
above-mentioned conventional drawbacks. Hereinafter, the present invention will be described
with reference to FIG. 2 showing one embodiment of the present invention and FIG. 31 showing a
holed gage 1 used for the combination 1 thereof. The circuit of FIG. 2 corresponds to the muting
signal generating circuit 17 in FIG. 1, and the reference 25 is an input terminal, the reference 26
is a transistor, and the source is an input terminal via a capacitor 2'7. 25 is connected to the
collector via a resistor 28, and the emitter is grounded. 29.degree. 30 is the resistance of the
base nose piece of the transistor 26 and is connected in series to the dark of the power supply (g)
and ground (pruning). The reference numeral 31 denotes a transistor, the base of which is
connected to the collector of the transistor 26 via a capacitor 32 and a diode 33 in series, the
collector is connected to a power source (t) via a resistor 34, and the emitter is grounded. Also,
the diode 35 is connected to the dark of the connection point between the capacitor 32 and the
diode f-33 and the ground, and is the paste of the transistor 31? A series circuit of a resistor 36
and a capacitor 37 is continued between the ground and the ground. Reference numeral 38
denotes a transistor, the base of which is connected to the collector of the transistor 31, the
collector is connected to a power source (t) via a resistor 39, and the emitter is elongated. The
reference numeral 40 denotes a transistor, the base of the source is connected to the collector of
the transistor 3 and the collector is a resistor 41, and the collector is .quadrature. 4 !
Reference numeral 42 denotes an output terminal derived from the collector of the transistor 40.
The output terminal 42 is connected to the base of the transistor 26 through the resistor 43 to
form a return circuit (9i).
A parallel circuit of a capacitor 44 and a resistor 45 is connected between the output terminal 42
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and the ground. The capacitor 31 and the resistor 28.36 constitute a large-scaled constant circuit
by the capacitor 44 and the resistor 41.45. Next, in the above configuration, the combination will
be described. When the record performance is not performed and the signal is not reached to the
input terminal 25, the transistor 2 does not output an AC signal if it has 7 collectors, so that the
transistor 31 is nonconductive and the transistor 38 is conductive. In the state, the transistor 40
is non-41 MIabK. Therefore, the collector potential of the transistor 41 is still 1 °, and the
output terminal No. 2 does not output a cut signal to the gate circuits 15 and 16. 18 shown in
FIG. On the other hand, the collector potential of the transistor 41 is supplied to the base G1 of
the transistor 26 via the resistor 43 constituting the feedback circuit, and the transistor 26 is in a
sufficiently conductive state. At the above-mentioned ta, it is assumed that a four-channel record
performance is started, and a signal having a waveform shown in FIG. 3 (A) comes back to the
input terminal 25. In this signal waveform, the signal in the voice station waveband is frequencydivided at 30 KH 2 and there is a portion with a low signal level 11 in the portion shown by ▪.
The signal shown in FIG. 3 is inverted by the transistor 26 and the signal waveform shown in FIG.
After this signal is swept back by the diode 33.35, it is half-turned through a capacitor 37 V and
applied as a DC voltage to the base of the transistor 3. Thus, transistor 31 is inverted, transistor
38 is turned off, transistor 40 is turned off, and the collector potential of transistor 40 is lowered,
the gate circuit 15, 16.18 shown by @@ VIK. The gate signal is increased in strength and
detected by the detection Q filter circuit 13.14 (the signal is supplied to the composite circuit 10,
and the four-channel non-use lamp 19 is turned on). Also, the collector potential of the F
transistor 40 is also supplied to the base of the transistor 260 through the resistor 43, and the
potential of the base of the transistor 260 is lowered to raise the sensitivity of the transistor 26.
In part, due to the drop of the base potential, the transistor 26 is in the class iJA amplification
operation state, one side of its collector output waveform is not clipped due to saturation, and the
apparent amplification に 対 す る for input haiku is Increase.
Therefore, as shown in FIG. 3, the signal known at the input terminal 25 is polished for a certain
period of time by passing through a time constant circuit including capacitors 3 and 44, etc., and
reaches the output terminal 42. No. 9 and it is returned to the input side, and the sensitivity
increases more than that of B11 with respect to nine and nine signals at its auxiliary input
terminal 25. The thick line shown in FIG. 3 (B) indicates the DC potential of the □□□ i collector
of the transistor 26. Thus, in the case of four-channel stereo record playing, even if there is a
portion where the signal level shown in the zero portion of FIG. 3 is low in the input signal, that
portion is sufficiently amplified as shown in FIG. As a result, the signal sensitivity of the muting
signal generator 17 is high. Next, when the two-channel record Ill is performed, it is assumed
that the signal of the waveform shown in FIG. 3C arrives at the input terminal 25. This signal is a
signal which can pass through the high-pass filter 1 & circuit 6 shown in FIG. 1 among the
signals belonging to the voice band and there is a signal level control part in the part shown by
▪. The signal type shown in FIG. 3 (C) is amplified by the transistor 26 and becomes a waveform
in which one side 1 is clipped as shown in FIG. 3 (D). This 1g is rectified by the diodes 4yF-33,
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35, smoothed by the capacitor 37, and applied to the base of the transistor 31 as a DC voltage.
The high part O of the signal level shown in the third section 1 (D) occurs only rarely, and it is
still low because the transistor 260 is low, so that the DC voltage applied to the base of the
transistor 31 is low. The level is not sufficient to render transistor 31 conductive. Accordingly,
the transistor 31 is nonconductive, the transistor 38 is conductive, the transistor 40 is
nonconductive, and the output terminal 42 remains at the negative potential. Therefore, no gate
signal is given to the gate circuits 15, 16 and 18 shown in the first point, so that the @ sign
shown in FIG. The lamp 19 is also not starved. Also, since the output terminal 42 is still at the
potential, the potential is also supplied to the base of the transistor 260 via the resistor 43, and
the sensitivity of the transistor 26 remains low. Thus, in the case of two-channel stereo record
playing, even if there is a portion where the signal level is instantaneously high as shown in the 0
portion of FIG. 3 (C) in the input signal, that portion is a time constant circuit Since the 賜 Q し か
も and the transistor 26 maintain the low state, the 慇 艮 of the muting signal generation circuit
17 is low, and no circuit signal is output from the circuit 1′F.
As described above, in the muting signal generation circuit of the present invention, a feedback
circuit for feeding back the output of the muting signal generation circuit to its input node is
provided, and the time constant circuit is internally bored, and signals belonging to the audio
frequency band are "Fb1E [") when the signal over the audio frequency band comes in, the
frequency with the signal beyond the audio pigeon wave band. ′ ′ Fb! 5KLl)r・
=x−f47. -The reliability of the operation of Rika No. light production 鮎 is extremely high,
and its 5IIJ nest is large.
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