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JPS50134606

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DESCRIPTION JPS50134606
Patent application (19) April 10, 1974 2 Inventor Sugi name Yukio Sugimoto (1 other person) 3'l
'! J'K'l applicant i 1 place Osaka Prefecture Kadoma city Oza Kadoma 1006 address name ('!
(582) Representative Matsushita Electric Industrial Co., Ltd. Representative Masaharu Matsushita
4 Agent ? 517 Address Osaka Prefecture Kadoma City Ogata Kadoma 1006-5 List of
Attachments 1-1 ? Specification [Facial] Japan Patent Office ? JPA 50 The present invention
relates to a 4-channel stereo re-insect device of the CD-a type, and the present invention relates
to a 4-channel stereo re-insect device according to the present invention. In general, the noise
canceller in the CD-a type 4-channel stereo reproduction apparatus is composed of a field effect
transistor Q5, resistors R1b, Rly, Rla, R19 and capacitors Cy, CB as shown in FIG. Noise detecting
switching circuit 11, transistor Q1, resistor RO and capacitor C5 for detecting excessive deviation
A triangular wave generation circuit 14 for generating a triangular wave train, and the transistor
Q2 resistor R? , Rla and Ih2, and the excessive deviation detection circuit 16 and the transistor
Q3. Q4 and resistor 1 (+1. A switching pulse generation circuit 17 formed of R + s, R + a, R + s
and core C7, a transistor Q6, a resistor Rzo, i (z +, a capacitor C + o, C11 and a diode D2. It
consists of a DA and a long time muting circuit 19 muting over a long time EndPage: 1 when
switching pulses occur frequently. In the noise canceller having such a configuration, the pulse
train from the detection circuit S is applied to the base of the transistor Q1 constituting the
triangular wave generation circuit 14 and is applied to the base of the transistor Q2 constituting
the resistor R8 and the pulse of the pulse train. The switching pulse generation circuit 17 is
operated with the detection output to control the switching circuit 11 for noise cancellation by
the output of the switching pulse generation circuit 17. The muting circuit 18 is operated for a
long time by the output of the circuit 17 and the switching circuit 11 for noise cancellation is
controlled by the output of the muting circuit 1B for a long time ? As described above, the
present invention 4 channels of & CD-4 system The present invention K takes a line or less with a
simple circuit configuration. In the figure, which is a block diagram of channel stereo redrawing
0, 1 is an amplifier for Ji + J, 2 is a low pass filter for extracting only the main channel signal
from the output amplified by preamplification 1, VR is a separation adjustment. Variable resistor
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for amplification, 3 is an amplification circuit for amplifying the main channel signal, 4 is a
matrix circuit, 5, 8 matrix, and low frequency #!
J @ circuit, 7 is a band pass filter circuit for extracting a subcarrier signal including a subchannel
signal from the output amplified by the preamplification circuit 1, 8 is an amplifier circuit for
amplifying the subcarrier signal passing through the band pass filter circuit 7 , 9 is a detection @
path consisting of a pulse count detection circuit including an FM detection circuit or a pulse
shaping circuit and an integration circuit, 10 is a low pass filter circuit for extracting only
subchannel signals included in I carrier signal, 11 is noise cancellation Switching circuit, 12 is an
acid alpha equalizer circuit, 13 is an automatic noise reduction circuit, 14 is a triangular wave
generation circuit formed by detecting excessive deviance noise, 15 is an output obtained by the
triangular wave generation circuit 14 as an input for noise cancellation Switching pulse
generation circuit for generating switching pulses for controlling the switching circuit 11 6 2 rl! J
is a diagram specifically showing the main part of the image shown in FIG. 1. In the figure, Q1 * R
+ * C + Fi The transistors, resistors, capacitors, C2.degree. R2, R1! I, R4, C2, I) I are transistors,
resistors, capacitors, diodes constituting the switching pulse generation circuit 16, Qs, R6, R7,
CA, C4, C2 are field effects constituting the switching circuit 11 for noise cancellation It is a
transistor, a resistor, and a capacitor. In the above embodiment, the CD-4 signal amplified by the
preamplification circuit 1 is separated from the main channel signal by the low pass filter circuit
2 and the band pass filter circuit 7 from the subchannel signal including the subchannel signal.
The candidate channel signal passing through the low pass filter circuit 2 is applied to the matrix
circuit 4 through the variable resistor VR and the amplification circuit 883 for the Sжvжla H aMM,
and the subcarrier signal passing through the band pass filter circuit 7 is The sub-channel signal
applied to the detection circuit 9 through the amplification circuit 8 and passed through the lowpass filter circuit 10 after being detected here is sent to the switching circuit 11 s for
cancellation of the ? tone ?M equalizing circuit # 812, automatic noise The voltage is applied
to the matrix circuit 4 via the reduction N13, and the output end of the matrix circuit 4 is turned
on. It is possible to obtain a separated audio output. By the way, in the 4-channel stereo
reproduction device of the CD-4 system, a lot of noise appears in the sub-channel signal due to
dust attached to the raid board. Therefore, in the above example, the subcarrier signal is
converted to a pulse train shaped by the detection circuit 9, and this pulse train is applied to the
triangle generation circuit 14 button, and the output of the triangle wave generation circuit 14
generates a switching pulse. The circuit 16 is operated to control the noise cancellation switching
circuit EndPage: 211 according to the output of the switching pulse generation circuit, and
configured to cancel noise 1 sound backward by noise generation l1t1Jf, 0 or less, The 4
'Japanese sound elimination operation will be described.
?? ??? The pulse train from the wave circuit 9 is normally 1 wind, a pulse train
corresponding to the transmission frequency of the yanonel signal, and [2 appears, but the
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record 0 k with M cause dust dust which is faithful 0 dwell In the case where it can not be done
and the hole appears as a form where the pulse of that period is missing 0 In such a case, the
subcarrier has received a major frequency deviance at minus ill ', K becomes that f Such a pulse
train is applied to the pace of the transistor Q1 constituting the triangular pB generating circuit
14 at a point where a large e pulse-like #fif appears when detected. Therefore, the transistor Q1
is turned on when the pulse is applied, and the capacitor Cl1C @, 17 is always turned on
instantaneously through the transistor Q1 (r. Then, when the application of the above pulse is
completed, the upper six bit transistor Q1 is turned off, and while the next pulse of ?1. Become.
The triangular wave train corresponding to the pulse train appears at the collector of the
transistor Q1 because the pulse interval becomes wide when the pulse dropout occurs, so the
triangular wave appearing at the collector of the transistor Q1 is The pulse height 11fL is
increased ? ? The collector potential of the upper Me transistor Q1 is applied to the pace VC of
the transistor Q2 constituting the switching pulse generation circuit 16f. The operating level of
the transistor Q2 constituting the switching pulse generation circuit 16 is the sum of the voltage
across the diode D1 and the voltage between the pace and the emitter of the transistor Q2, and
this one level is generated at the collector of the upper transistor Q1. When the wave value of the
triangular wave breaks down, the transistor Q2 is turned on and the collector potential of the
transistor Q2 becomes extremely low @ and this collector 18 is a field effect transistor which
constitutes the 4 Vf erasing switching circuit 11 Applied to the gate of Q5. Since the source and
drain of the charge-up ffi transistor Q5 have their ports 9-... And their resistances R6 and R7 and
the printing opening 7 'at + 1-, the field effective field is obtained by adding the above "tavw" to
the gate. Tranquisda Q5 pinched off and eri, its l! The output of the Jmy circuit e will not be
transmitted by the equalizer circuit i12 & ?. Therefore, the output of the input spring of the F% /
PM equalizer 12 becomes an output of a truncated shape only in the section where the abovementioned trouble occurs, and it is possible to grind large pulse noise f as much as possible.
In this way, when subcarrier No. 18 drops out in a single-shot manner, the corresponding
deviieron (l-detects, makes one switching pulse generation circuit with this side output, and
makes the switching circuit for noise ? inside by the output By controlling 11, it is possible to
eliminate seven M1 ... M sounds. However, in the case of '3A, there is no limitation to ri if it
occurs singly in the absence of the above-mentioned additional feeding signal as described above,
and there are many cases where it is stopped in a certain manner. Subcarrier (When the drop of
No. 1 is stopped, the town field effect transistor Q5 biton-off 10 returns, but the pulse-like noise
is not generated in the output but the distortion due to on-off resuscitation 1 and air out occurs
Therefore, the collector IalBb of the transistor Q2 which forms the switching valve 64 circuit 15
is divided into two in the upper d pin name 1 (the time constant circuit by the resistance R5 and
the capacitor C2). I am in trouble. Item 1! In the case of w VC where Tjij transmission number
dropouts frequently occur, the on state of 1 6I 'transistor Q2 is 2! ! Continue to stop. Such a J9
coupling, light + B'if source is gradually accumulated in the capacitor C2, and its collector power
will be kept low even if the transistor Q2 is turned on. Therefore, when the collector noise of the
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transistor Q2 decreases, while the source drain 11411ft pressure of the field effect transistor Q5
is higher than the pin thiofull ratio VC, the destination transistor Q5 is turned off, and the
subchannel (M) Will not propagate to the equalizer + pJ path of As described above, the drop 1
wave (the drop of the drop No. 8 of the No. 8 is generated continuously, and the deviance of 16
pulses is detected, and the operation period of the switching pulse generation circuit by the
detection output in the time constant circuit Since it is arranged that only the section in which
the above-mentioned trouble of the output at the 1b VPM equalizer circuit 120 input terminal
EndPage: 3 has occurred is cut off, the distortion component in the noise cancellation switching
circuit 1511 is reduced. There are As described above, the present invention detects the
excessive de Vie V and cuts off the open channel signal path while it is extended by the one time
constant surrounding path from the above-mentioned blocking section pipe and newly generated
by blocking the compensation passage. The distortion component section is configured to divide
by four, so that four distortion components that are newly generated can be effectively
eliminated by blocking the pS signal path, and excellent reproduction sound can be obtained. Is 0
4. Brief description of the drawings Fig. 1 shows a block diagram of a 4-channel stereo Gyu W &
Ax, showing an example of the present invention, ': ir 2 shows the JM section of the same device.
-Fig. 3 shows a conventional 4-channel stereo nisei device @ electrical @ road connection! iii. 9
...... detection circuit, 11 ииииии noise cancellation switching circuit s15 "и и и и the switching pulse
generation rejuvenated Q2 ...... transistor, Dl ...... diode, Rs---------------------------------------------------------------------------------------------------------------------------------------------------------------------и и и и и и и и и и и и и Name of
patent attorney Toshio Nakao et al. ) Agent address Osaka Prefecture Kadoma city Oda Kamon
1006 Matsushita Electric Industrial Co., Ltd. Name (6152) Patent Attorney Shigeno Ogino, 1 JP
50-134 606 (5) Procedure Amendment June 2, 1955, Secretary General of Patent Office Name of
the person with the invention 2 name of the matter f'1 Patent applicant address in Osaka
Prefecture Kadoma city Ogata Kadoma address 1002 Name (582) Matsushita Electric Industrial
Co., Ltd. Representative Matsushita Shoji 4 agent address In the lower electric appliance industry
Co., Ltd. 5 banning urine 2 page 16, contents of correction 1 1'R5, J is inserted in front of "R6"
on page 6 line 12 of the specification 02 @ @ Correct "?" in lines 5 to 6 to "?". 3) Correct the
figures in Figure 1 and Figure 3 as attached. Figure 1 EndPage: ?
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