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2. Inventor k ? ? ? ? -Wit ? 3. Patent applicant, Isseisho 8221, Kanagawa Prefecture
Yokohama city, Yokohama city, Yokohama city, 3 districts, 12th Moriya-cho, ?? (432) Japan
Victor, Inc. ?, President sound president and president, Kitano Yoshiro 4, agent [phase] Japan
Patent Office и published patent gazette ?? JP 49-4 0002 Request for examination (all 6 pages
in total), Office serial number 0 Japanese classification specification 4 title of invention
Muting circuit
3. Detailed Description of the Invention The present invention relates to the mini-ting circuit used
in a multi-channel disc reproducing apparatus, the random noise component K in the
reproduction input signal, without malfunction due to the momentary carrier wave. The purpose
is to provide a circuit for performing muting in a good and reliable manner without
discontinuously performing miniaturizing metal by discontinuity of components [generally, in a
multi-channel disc reproducing apparatus As one muting path, a muting control circuit capable of
reliably detecting the presence or absence of an angle-modulated carrier wave and a muting gate
circuit whose gate operation is controlled by a detection signal thereof are required. The
conventional shooting circuit can not reliably detect the presence of the angle modulated carrier
wave but can not reliably detect the absence of the angle modulated wave transmission. For
example, even if there is no angle modulated wave in the reproduced signal, within the J angle
modulated carrier band. Even if there is a high EndPage: 1 harmonic of the audio frequency band
that occurs during tracing of one channel record with no carrier at all, the conventional
minimizing circuit operates with uncertain operation due to this modulated wave. There was a
drawback of doing and playing noise in the playback sound. The following is a more detailed
description with reference to the drawings. FIG. 1 and FIG. 2 respectively show a system diagram
of a conventional miniature circuit and a circuit diagram of an example of the circuit. A
reproduction signal from the record disc reproduced by the pickup p is supplied to an input
terminal l and an amplifier 1 and a carrier amplifier J from an input terminal l. If the
reproduction disc is a multi-channel disc, out-of-band noise is removed by selection of a center
carrier by reference to a central carrier selection circuit consisting of a transistor Tr and a
resonant circuit of a coil IAI and a capacitor O ?. Will be issued. This carrier taken out via the
coil L2 is a rectifier circuit like a diode "11D2! The output signal is rectified and level detected,
and then the carrier frequency component is removed from the integrating circuit including the
capacitor 0 ? and converted to direct current. The switching circuit 7 formed of the transistor
Tr2 performs switching at a certain DC level, and the switching circuit 7 necessary for driving the
gate circuit t turns on / off the signal from the amplifier 1 to turn on the gate operation of the
signal from the amplifier 1 and performs # 7t-multi When channel disc playback is on, all signals
are sent to the output terminal de, and when multichannel disc playback is off, signal is off ? ?
? ? ?? ?? ?? ?? ?? ??If a noise component comes in (for example, noise due to the
presence of a modulation wave generated from the pickup cartridge in the carrier band when
reproducing a ? channel disc, noise due to a modulation wave such as hum), etc. Is the average
voltage and above the switching circuit 70 on level When it becomes, the gate circuit t is turned
on, resulting in malfunction of the muting.
The present invention eliminates the above-mentioned drawbacks 69 and will be described
hereinafter with reference to its embodiment. FIG. 3 shows a block system diagram of an
embodiment of the mute ink circuit according to the present invention. The reproduced signal
from the record disc reproduced by the pickup is picked up by the input terminal l and an input
amplifier l and a carrier amplifier and carrier selection circuit J (0 circuit J ($) supplied to l). The
carrier is a rectifier circuit! , And supplied to the time constant circuit 10 to be integrated. Here,
the carrier component has a waveform shown in FIG. (M) and the envelope on one side thereof
has a waveform shown in FIG. On the other hand, irregular noise components other than the
carrier have the waveform shown in FIG. 3 (m) and the envelope on one side has the waveform
shown in FIG. 3 (B), or 0 if the carrier is instantaneously interrupted. The waveform shown in Fig.
6 (m) and the one-sided envelope have the waveform shown in Fig. 6 (B). Therefore, it is
necessary to detect each input envelope as faithfully as possible whether the input signal is a
carrier of a continuous signal or discontinuous noise, and the time constant circuit 10 performs
this. In addition, it is necessary to attenuate the carrier ripple as much as possible. The output of
the time constant circuit io is supplied to the inverter l. The inverter ti performs on / off
switching each time a certain level is switched according to the magnitude of the envelope of the
input signal, and the next inverter performs waveform shaping and phase inversion. The time
constant circuit 13 and tS, unlike a general integration circuit, show an integration time constant
in the on level direction together with the inverter of the previous stage, and the time constant is
small for the off level and ideally becomes zero. Do the action. Here, the time constant circuit 13
and the time constant in the on-level direction of lj are respectively represented by h, and the
time constant circuit / jt is connected to the constant number circuit 13 with a phase relationship
of ltO. . If the inverter / J is on in the presence of a carrier and off in the absence of a carrier, and
the envelope of the noise in the carrier band is discontinuous as shown in FIG. If it is more than
off for the next stage, it is on. Therefore, the above time constant Th? Carry out multi-channel
discs by setting them to appropriate values. EndPage: 2 O Multi-channel disc playback is
normally performed, and carriers do not generate discontinuities in the normal state, but dust is
found on the disc surface. If there is a defect in the pick-up card cartridge trace, the carrier may
be interrupted.
In this case, the time constant circuit 13 reacts, muting is turned off by the time ': 1 and H' 7
times when the carrier is interrupted, and the reproduced sound is discontinuous. Therefore, in
order to prevent the occurrence of the discontinuity of the reproduced sound, the time constant
circuit tsft has a margin for the period of 7 for the discontinuity of the carrier. The output of the
time constant circuit is applied to the gate circuit IVC via the terminals 1 and G and 17Yr to
control its gate operation ? Depending on the 11 classes of the gate circuit 1 used, the time
constant circuit /! It is also possible to provide a waveform shaping circuit that follows the
inverter it and / or decipher, and applies the output to the signal circuit t from the output
terminal l. Next, respective embodiments of the specific electric circuit of the main part of the
block system shown in FIG. 3 are shown in each of the embodiments ts7 and FIG. The differential
signal carrier component taken out in this stage is amplified to obtain the specified mini-timing
operation sensitivity in the Im1 circuit J, which is directly connected to the stage of the transistor
Qi * C2. , D2 and the voltage is rectified by the rectification circuit j, and the envelope detection is
performed at 0, ie, when a DC output corresponding to the carrier level is taken out. Here, the
commutation time constant is set as small as possible in order to detect the envelope properly
and indeed. The definition of time constant force is from the off of the input signal (carrier) to the
transistor of the next inverter ll, until C3 is off (Table 1, Carrier on to transistor Q,? The time
constant until it is turned on is generally strictly different from Z, but for the sake of explanation,
it is assumed that Y) 9) This time constant 7. Is determined by the resistance Rc% diode DI, D2,
the capacitor / source O1, C2, and the resistance R @. Although the time constant conviction has
a small delay in detecting the t 'yo envelope, but the ripple effect of the carrier frequency
requires the smoothing action that the transistor q4 of the inverter 12 is not affected by the on
and off time constants. There is a lower limit on For the carrier, the envelope (7, is also included)
shown in FIG. The output waveforms of the transistors Q and ? are as shown in FIG. ?????
???? The time constant circuit 13 is connected to the output circuit of the circuit and has a
time constant of only the output waveform ?on direction. If there are no carriers at the input or
below the mute level, then transistor Q3 is off, so transistor Q4 is on and the charge on capacitor
C3 is discharged by the on resistance of transistor Q1.
At this time, the on-resistances of the transistors Q and 4 are several plus ohms, and it is possible
to make the fall time due to discharge on the order of ?sep. Conversely, if the input is above the
muting level, transistor cLl. Is cut off, but the transistor Q5 of the next stage is turned on via the
time constant 72 determined by the resistor R2tR5t '% 1 and the transistor Qp input resistor and
the capacitor C5. (Lc) shows that the transistor Q5 is turned on with a delay of m. However, in
the same figure (D), when the capacitor 04 of the time constant circuit is taken into
consideration, the same figure (In) shows a waveform when the capacitor 04 is taken into
account. ON of the ring 1. Indicates an off waveform. Next, a discontinuous noise boop as shown
in FIG. Io (m) is as shown in FIG. (B), and an output waveform of the transistors Q and 4 is as
shown in FIG. (0). Therefore, discontinuous carriers below the time constant are below the on
level of the next stage, and mirroring is kept off. This is performed utilizing the property that the
time constant circuit 13 operates only when it is on and the time constant of the off time is very
small. Also, the transistor Q ? is in the cutoff position when the carrier input is present, and this
property is utilized. The main feature of the muting circuit according to the present invention is
that the time constant circuit / J of the time constant has the above property as an automatic
switching circuit of multichannel disc and 2-channel disc EndPage: 3; This is that 7? is selected
to satisfy the relation of 'Z /' <<. Noise components that fall within the carrier band during disc
playback are always in the discontinuous wave i shown in Fig. 10 (B) K for audio signals, and p
good results can be obtained by the circuit with the circuit constants shown in FIG. . FIG. 11 (A)
shows a wave form when there is a dropout associated with the input carrier at the time of multichannel disc reproduction. The envelope is as shown in (B), and the transistor Q4 is a dropout
capacitor C3? After discharging, the output of the next stage becomes an intermittent waveform
shown by (D) in the figure, and the reproduced sound becomes unnatural. However, the time
constant 7 after the inverter / l. If the time constant circuit lj is provided and the duration of the
dropout is 73 or less, the on level does not become higher as shown in (1) of the figure, and
muting is maintained in the on state. In the practical example, the time constant 7. Select ffio * to
Q, Jsec or so.
In FIG. 7, a resistor R6 is inserted as a capacitor C4 in order to prevent a large transient current
from flowing due to discharge by a 10 .mu. Is used. The transistor Q6eQ7 constitutes a waveform
shaping circuit necessary for driving the gate circuit. The resistor R9 is connected between the
collector of the transistor Q7 and the base of the transistor Q6 to form a positive feedback
circuit, and has a short rise and fall time of the waveform. The embodiment circuit shown in FIG.
7 is a further improvement of the embodiment circuit shown in FIG. 7, and only the
improvements will be described. The rectifier circuit S is a double-wave rectifier circuit and is
selected to have a smaller time constant Zk of the time constant circuit IO. Also, in order to set
the time constant when the time constant circuit 13 is off to zero regardless of the value of the
capacitor C5 and the value of the on resistance of the human body resistor Q5, it is connected to
the rear stage of the n / dogade / gold time constant circuit 13. . Therefore, the time constant
plating can be set to a very large value, and the ratio of ? can be made larger than in the circuit
of the above-described embodiment, so that a more reliable muting operation can be performed.
In the practical example, the time constant {circle over (1)} is selected to be several tens ?mg,
and ? is selected to be approximately Q, 2 aa. As described above, according to the muting
circuit of the present invention, the muting can be intermittently performed by the instantaneous
interruption of the carrier component in the input signal without malfunctioning due to the
irregular noise component in the input signal. It has a feature that muting can be performed well
and reliably without making the playback sound discontinuous.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an example of a
conventional muting circuit, FIG. 1 is a circuit diagram of its electric circuit, and FIG. 3 is an
embodiment of the muting circuit according to the present invention. Block diagram of Fig. Da
'(A), (B)%' Fig. J (M), (B) and #! 6 (m) and (B) show the waveforms of the carrier, noise, and
momentary interruption, respectively, and the carrier 'waveform and its one side envelope
waveform, and FIGS. 7 and 1 respectively show FIG. Fig. 9 (A) to (F), Fig. 10 (m) to (F) and Fig. 1 /
A (A) ) To (F) are waveform diagrams relating to carriers, noises, and carriers having momentary
interruptions in respective portions of the circuit shown in FIG. ? иии Amplifiers, 3 и и и Carrier
amplifiers, l и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и center carrier selection circuit Inverter,
1311 ... time constant circuit, 14! --- Inverter, / j * ee 79 time constant circuit, it. 19 и и и, inverter,
? 0 и и и bypass or HA band bus filter, J и и и и и и и и и Nanto gate. Patent applicant Nippon Victor Co.,
Ltd. Attorney Attorney Tadohiko Ito End Page: 4-J Procedure Amendment Letter A 961 / Jan. 1
Display of the case, Showa-annual patent application number 1 / ?? 1 No. 2 * Name of @ @
Selotainda am 3 A person who makes correction ? ? Applicant address и 2221 2 3 ? ? ? ?
Kanagawa Prefecture Yokohama City ?? ?? Name ? 432) Japan Victor Co., Ltd. Director
president Yoshiaki Kitano 4, agent address 8105 Shinbashi 1-chome, Minato-ku, Tokyo No. 18
19 Kimuraya Otsuka bi J le 3rd floor Name (7015) ? m Territories Ito Tadahiko, '\\, t'; Tatsumi:
Go six, target of correction
Muting circuit
Column 7 of the detailed description of the invention in the specification, contents of correction
('/) In the specification, in the specification, J: [/ 4] is corrected as "shooting" ? "muting"
described in the row. 0) In the same manner, correct the "change in angle" described on page 2 /
line j as "change in angle". 0) In the same way, on page 3, line 3, "to put out" is compressed as "to
occur." (The ?modulated wave? described on page 44, page 1 // N / J and line 13 is corrected
to ?harmonic?. (Insert ?Vc 2? between ?Period period?? Described in 1g page 6/4 lines
and ?The following? and ?-in the same way, page 7 line 7? At this time, when ToIN ?Tz-1 is
1? ': off. ff and the time of the sum of time constant circuit 130 time constant 7 ?. Correct with
ff + "j-2-1. EndPage: 6 Warning: Page Discontinuity
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