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Specification 1, Title of the Invention 1% Claims Modulating the difference and difference signals
between the first and second direct wave signals TL, TR · and the third and fourth localization
information TT, TQ as localization information An angle-modulated wave, which is anglemodulated as a signal, is superimposed on the direct wave signal, and the recording equalization
curves of the fifth and fourth localization information signals are different for each other in the
multi-dimensional reproduction apparatus. The amplitude suppression device t-is added only to
the fourth localization information signal TQ in order to prevent the deterioration of
reproduction quality due to
Noise suppression circuit
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a noise
suppression circuit for use in the backward iIIgl path of a multiple stereo reproduction device,
wherein 1? In order to suppress the amplitude of the disturbance included in the TQ system in
the jLth order system proposed as UM, the invention relates to a noise suppression circuit 7. The
applicant of the present invention has previously proposed a multi-dimensional stereo
reproduction apparatus as a 0M system in Japanese Patent Application Laid-Open No. 45-46520
and Japanese Patent Application Laid-open No. 45-46301, and four channels are transmitted to
the above system. In multi-dimensional stereo reproduction called UD-4, transmission signals
called TR, TL, TT · and TQ are used. The above-mentioned TR signal and TL scratch signal A
signal having the same property as an audio signal for conventional stereo reproduction, or a
fifth signal TT signal steepness for enhancing localization information at the time of multichannel reproduction The digit TQ signal passes through one equalizer with different recording
equalization curves, and further passes through the sum-and-difference circuit, and the
calculation father # calculates. The digital carrier is modulated to the TT signal text and the TQ
signal 411 difference signal, and these signals are superimposed on the TL signal and the TR
signal respectively and recorded in the sound groove of the right side of the disk. When playing
back a signal recorded in the sound groove of this disc, use 1 Correla with reproduction
equalization characteristic opposite to the recording equalization characteristic, and use those
characteristics as before TT signal call and TQ double signal recording. The above-mentioned
recording equalization characteristics are shown in FIG. 1 in order to avoid the distortion due to
the crosstalk of the carrier waves recorded in the left and right sound grooves of the disc. 2048
level difference is to be waited at the low frequency of the characteristic. Therefore, in many
cases, the royalties of the frequency spectrum of musical tones are generally concentrated on the
low frequency frequencies. 2 When recording, the TT signal text and the TQ signal band are
limited to attenuate high frequency components during recording. In consideration of the angle
modulation of the carrier wave, the TT signal will be called as a king. The demodulation part of
the multi-channel disc reproducing apparatus in the conventional UD-4 system will be described
with reference to FIG. 1c, and is formed into a form of an encoded TT double signal and TQ
double signal (TT + TQ) signal. This signal t? Corner the carrier as a modulation signal! A
modulated modulation wave is taken out from a carrier disk (not shown) and applied to an input
terminal A. On the other hand, in the form of a difference between an encoded A2TT signal and a
TQ signal 2 (TT-TQ) signal, this signal is used as a modulation signal to angularly modulate a
carrier wave to obtain a modulation signal tI1. Is added to the input terminal B from the carrier
disk (not shown).
In addition to the terminal m, the 7t1 modulated wave is added to the demodulator 4) via the
band amplification 5 (1) to obtain its output terminal CK'J adjusted r'L statement (TT + TQ)
signal. On the other hand, he-modulation wave applied to the terminal B is applied to the
demodulator 4 via the band amplifier (2) to obtain a signal tl, 7t (TT-TQ) demodulated at its
output terminal. In addition to these demodulated signals (TT + TQ) and (TT-TQ) @ + 11 circuit,
5), its output part KKTT signal is obtained and the demodulated signals (TT + TQ) and (TT-TQ) t-8
times M (6) K7Jll Esono Ltl force terminal 11'1 fCT q Get polarization. 4 children and PK TT TT
double signal and TQ double signal respectively Reproduction equalization amplifier (7) and (8 J
卯 再生 reproduce * I'mli 'iii box d) It amplifies and corrects each signal level, and is respectively
obtained by the TT level signal and the TQ signal output terminal G and H of the same level.
These TTgT and TQ-fold signal output terminals G and H are supplied to the decoding matrix (not
shown) connected to water together with the fL tangential wave signal TL and TR, and the output
is added to the speaker to form a reproduction signal. There is. In the above-mentioned
configuration, the above-mentioned modulated wave is disturbed by jAAs2 and (in extrinsic state
other than the state required for demodulation in season [demodulator 13) and the output of b. It
becomes 411 with a disturbance wave unlike the signal. Even if the amplitude of this disturbing
fresh wave is in a state where the amplitude of the disturbing wave is small (17+, iita, 3) and (4)
of the demodulation signal (TT + TQ) and digging (TT-TQ) 1; The amplitude L of the TQ4 @
obtained as the output of the 篭 circuit (6) connected to the next stage of) increases by a large
amount when it generally increases. It becomes a fault. One of the above-mentioned disturbance
wave generation will be further described in FIG. In the figure,-) are the demodulated signals (TT
+ TQ) and (TT-TQ) obtained at the output terminal of the demodulator '3) i4), respectively, and L
is mixed in, for example, the ylJ4 signal (TT-TQ) It will be a disturbing signal. In the figure (6)
t65, there are a TT @ signal and a TQ signal which can be calculated by calculating the two
demodulated signals with the sum and difference circuit <5) (6). As mentioned above, the main
component of the modulation signal which is angle-modulating the carrier wave is TT @ kj, and
therefore, it is shown in (&) of Fig. 3. qTT signal ri demodulation signal (TT + TQ) father (TT-TQ>
q It is common for the disturbance wave shown in one of the figures to be doubled in time, and
the disturbance wave shown in M in the figure (6) in the TT code.
The amplitude ratio of the TT signal to the interference wave in the figure also shows that the
amplitude ratio of the TT signal to the interference wave is approximately Rty and is not
approximately Rty as indicated by N in q. This masking does not affect the reproduction quality
due to @@ feeling. On the other hand, during the TQ double signal which is sunk at the output
end of the work 9 difference circuit field to reduce the wages, the disturbance wave in the same
figure is the TQ double signal to the M 'in the cave 5 (b). The amplitude is relatively large in
comparison. The TQ signal regeneration equalization amplifier 18) including this v3 harmful
wave compares the TT signal by 20 JB 曽 1 with LQTQf! 吟 is at level 1 V with T'T signal and
interference wave in TQ signal is larger than TQ signal amplitude and TT signal amplitude as
shown in N 'in 1g3 figure kcJ Significantly affects reproduction quality. The present invention is
intended to provide a multi-objective three-dimensional reproduction apparatus by adding two
paths to the noise suppression cycle EndPage: removing the harmful effects as described above.
The characteristic is that the phase of the gl and the second transmission signal and the
difference signal of the second transmission signal are the modulation signal in modulation and
equalization characteristics of the fifth and the fourth transmission signals TT and TQ in the UD4 system. When the angle modulation is performed on the carrier, the noise is based on the
disturbance that is superimposed on the demodulation signal from the point that the signal
toning the carrier f is a TT signal to the king. By suppressing the amplitude, it is possible to
improve the disturbance due to the reproduction deterioration due to the noise of the
demodulation circuit to a point where there is no problem in hearing. Hereinafter, the present
invention will be explained with reference to FIG. The same reference numerals as in FIG. 2 in
FIG. The AfcTT signal obtained at the output terminal E in FIG. 4 dives the output terminal GICTT
signal via the regenerative equalization amplifier 1) as in FIG. On the other hand, the TQ-fold
signal amplitude limitation obtained at the output terminal 1-! After (9), the reproduction
equalization equalization amplification Q (sent to 81). Next, the recommendation f of the
amplitude MJ limiter (9) will be described with reference to the first failure. The n'ICTQ signal
obtained at the output terminal F of the difference circuit 16) has a frequency 橡 1 @ distribution
according to the TQ times signal reference spherical sound equalization curve shown in FIG. J'L
shown in JK, J'L's output amplitude upper limit M passing through the pregnancy site j
constrictor (9) and superimposed on the L5TQ signal. It is suppressed to n amplitude. On the
other hand, as described above, the TQ signal has 1T &, and the earth distribution of its spectrum
is 1T & low frequency, so it can pass through without being exposed to the upper limit of the
output amplitude of the field.
In addition, even if there is a possibility that a single county is clipped at the time of TQ sake
when touching a one-width upper slope of a 10,000-ai width limiter, 9), the reproduction
equalize throat unit of FIG. In the 19th clip lr, the unnecessary high frequency components
generated in the smooth 9+ clip are attenuated and there is no problem with the start of the
reproduction quality vcii. The amplitude limiter (9) may be a diode-provided limiter or a limiter
amplifier having f4 as well as a limitability, or a differential circuit f6) using a seven-speak
differential amplifier of the embodiment described later and a tremor-limiter Of course, it is also
possible to make the ′ 4 'of 9) go. The above-mentioned disturbance M No. 1 suppression is
described in detail in FIG. In the figure, ...-)-y are the demodulated signals (TT + TQ) and (TT-TGt)
(!!) obtained at the output terminals C and D of the demodulated ρ, 3) and (4) in Fig. 4
respectively. It is assumed that an interference signal indicated by 0 is superimposed on the TTTQ signal indicating the signal. {Circle over (5)} FIG. 6 (6) shows that 2 i% − (TT + TQ) and
(TT−TQ) are difference circuits! 6) The TQ signal obtained at the output terminal via 1ft and the
interference signal indicated by P in the same figure is much larger in vibration, Ig, and rJ than
the TQ signal. The redundant 51A (C) has an amplitude limiter (9-obtained through the amplitude
limiter (n7 +: signal in the same figure as the QQ signal), and the # signal in the figure shown by
Q in the same figure approaches the amplitude d compared to the TQ signal. Fig. 5 (d) shows that
the 'rQgi' is passed through the regenerative equalization amplifier (8) to obtain the regenerative
signal which is shown by R in the same signal line by 9 TQ times. To work! The effect of masking
by the TQ signal can be exhibited sufficiently, and the presence of the disturbing signal can be
side-viewed because of ItI sensitivity. The effects of the present invention vary depending on how
much the upper limit of the output amplitude given by the fc 工 bandwidth limiter provided in
the above-mentioned process is set, though! ! It is desirable to set the Iifz of the line segment JK3
to 3 to 20j from the cough on the TQ times signal reference recording equalization curve at the
modulation frequency KH2 as shown in FIG. It is a matter of course that the r4J result may be
obtained by manually detecting the value of 2 or detecting the musical tone level and converting
it to 6 as the detection signal. FIG. 6 shows one embodiment of the digging device according to
the present invention, and the above-mentioned value of X is set to approximately 12jI3 to obtain
a good effect. In the figure, at the input terminals C and D, respectively, the A signal (TT + TQ),!
The transistor TR + TR2TR3 to which T.T. (TT-Tq) is added constitutes a differential amplifier
yJJfIIJ @@, and the output image shown in FIG. Garbage difference 1. ! !
Path 16) and width control j temporary (also serves as a force. As shown before TQ signal
recording as 4T-reproduction purification @ 4t- consisting of a 7tT (j signal is a resistor R11
capacitor C4) lander TR4TR5 suppressed 4v output n block J resistance across the collector
resistance RIO of the transistor TR3 With the property set to 1000, the output 1 child EndPage:
3H is a signal to be sent to the n decoder matrix (not shown). In the present invention, as
described above, it is possible to suppress the noise appearing in the processing vTQ signal to the
interference signal due to various causes included in 1 (31 tone signal (TT + TQ) sentence (TTTQ). Due to the masking effect by TQ @, it is possible to make the 4-noise of Eri noise be
audiblely negligible, while the TT signal is inherently resistant to the same kind of noise, so the
carrier disk of Eri UD-4 system is reproduced in the present invention. The noise problem based
on the disturbance signal at the time of the noise has all the features that become to be solved.
4. Brief description of the drawings. FIG. 1 is a reference recording equalization curve in the UD4 system. FIG. 1M2 is a block diagram of a conventional multi-channel disk reproducing
apparatus, and FIG. 3 is a conventional diagram. Signal waveform diagram of the valley portion of
the reproducing apparatus, 4X4 is a block M diagram vf of the multi-channel reproducing
apparatus according to the present invention, and FIG. 5 is a signal waveform diagram of each
part of the reproducing apparatus according to the present invention. FIG. 1 is a circuit diagram
showing an embodiment of an amplitude limiter for a multi-channel disc reproducing apparatus
according to the present invention. +1) · (2) · · · Band amplifier, (3) · (season · · · · · demodulator.
(5) ... Sum circuit, (6) ... Difference circuit or (7) Out ... ... Reproduction equalization amplifier, (9)
... Image width limiter. Patent applicant Nippon Columbia Co., Ltd. Attorney attorneys Patent
attorney Kazumi Yamaguchi ・ 叡 図 Fig. 1 Fig. 2 Fig. 3 Fig. 4 End Page: 4 Fig. 5 Orim procedure
correction (self-relied 1977 17y +, 3+ 1) Indication of the incident Showa 1959 child application
number + 2'rsos 勺 · 2, 簑 B 肋 name 3 音 回路 circuit 3, person making correction 1 '1 with nie J
q q wording Noon delivery address jj F No. Li 107 Minato-ku, Tokyo Akasaka 4-chome 147 tt 144 agents! , -No; ˜, (((1..1. Dict. (4) (4) 14 'r' i order [raw 414. mg (8) J, the "bio-in. -1.8]] and
correct. Correct the same off page, line 4 "First chopsticks second" and "6" as "6 and 4". Page 10,
line 2 [Modulation frequency KH2J is corrected to [Modification 1A cycle and his number 1KH2J.
EndPage or more: 5
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