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Description t name of the invention
Multi-dimensional signal reproduction system
The present invention relates to a multiple stereo signal reproducing apparatus, and more
particularly to a distortion correction apparatus for musical tones in which a carrier wave at the
time of multi channel reproduction is modulated by a direction information signal and included
in a carrier disc. Modulated with the direction information signal and modulated onto the
modulated signal t--, and when the signal level is higher than a predetermined level, the
demodulation signal level detection means 1 demodulates to the sample hold voltage obtained by
the detection signal level detection means The level control is performed to reduce the noise
during reproduction by 41 level control. Conventionally, various systems have been proposed as
a multi-dimensional three-dimensional signal reproducing apparatus, but the applicants of the
present applicant and Shuang, Etch, and Cooper have proposed 7 as disclosed in Japanese Patent
Application Laid-Open Nos. 45-46320 and 45. The publication No. 46501 is already public. In
the present invention, in the case of reproducing a multi-dimensional signal by using an en: I
signal described in the above-mentioned publication, it is modulated with a carrier iIT Tg (CB et
al. Signal will be described later) particularly for 30 KH. In order to prevent an increase in noise
in the case of the effective S / N deterioration at the time of a short leg, in the above-mentioned
gazette, the above-mentioned publication is disclosed to facilitate the understanding of the
present invention. A brief description of the 37t engineering code idioms listed. Now, assume a
reference point o-ot- as shown in FIG. 1 in the sound field, and let the sound source at the point
of the angle θ 'from there be a day (' EndPage: 1θ '). When expressed as a function of the
localization accuracy all azimuth angle θ ′, it is expanded into a missing Fourier mantissa. s (0
')-? + a1CxlA?' +% ax2? '+------b! Blood θ ′ +% sh + 2θ ′ +. 1 °°°°°. The localization
accuracy of the above-mentioned BCD ') can achieve a Niji-accurate expression by taking many
coefficients of the above equation. The encoded signal of the Kacono system has the same f [O
phase angle as the azimuth angle θ' of equation (2) The electric signal t ′ ′ 4 represented by
the following equation with respect to θ is That is, S (<7) = ζ + 81. jθ + to j2θ + ..... -jo-j2σ0. .
0 # + C4 + ······················ 18 (11) In equation (18) 11 (3), all coefficients according to the channel
number are transmitted according to the channel number, and for n channel transmission, the
nth signal in equation (4) Transmission is necessary. These respective signals are expressed as
follows with respect to a plurality of sound sources S, S, S3. For example, in order to transmit
four channels, it is necessary to transmit a coefficient of four terms in the coefficient shown in
equation (4). The above-mentioned equation (4a) is a phase-independent fu signal, which is called
T.SIGMA. And corresponds to a difference signal of n + CrFiT.DELTA. And a stereo signal.
So where is it compatible with traditional stereo? #たせるために41. The signals of the
second channel are determined as follows. Substituting equations (4a) and (4b) into equation (4a)
and equation (4b) for Tj = T.SIGMA. + TA, kidney = T.SIGMA.-T.DELTA.1..1- (5) and considering
only one sound source (S +), 5t = 1 and ff ' Since L-B 51 = 1 and n-BK, it is referred to as 2BMX
reproduction when transmitting with two Tg + TLfiJ etc. and performing 4-channel reproduction
on the reproduction side, but in this case the 4-channel reproduction sound field is stable There
is a bad drawback of separation. (V this (4C) human blood T child signal? In addition, when TL
and T1 times are transmitted to T and 4-channel reproduction is performed on the reproduction
side, it is called ITMX reproduction, but in this case, BMX reproduction exparate,-/ yon is
improved. -(4d) When 9 channels of TQ, T, TT, and TQ signals are transmitted for 4-channel
regeneration, this is called iQMX regeneration, and separation is further improved than 7MX
regeneration. It has been confirmed by the inventors. In the present invention, the abovementioned T A, T (5 signals, 9 levels of the localization information signal mixed with the T2 2 T
Δ signal to create a 4-channel reproduction sound field, separation falls in comparison with
QMX reproduction but at the center JjlTt reproduces the tnfc sound field QMX included in the
noise due to the S / N deterioration of the demodulated signal. Reproduction of 4-channel sound
field with no change in localization at the center with little noise is made in view of the fact that
nil tone reproduction can be performed, and that one is As a method, effective S / Ni low tone
and bell time are demodulated and stored in memory at the demodulation level, and the memory
period T or the level of Tg is controlled according to the memory n'tt level to improve Sβ In the
conventional multi-stereo signal reproduction system [1 II Vc, the 8 / Nt-improved amplitude of
the demodulated signal is adjusted according to the variable n-wave level according to the
variable n-wave level. Lock range or apparent VJi tone band narrowly <L 4. A method is
employed in which the demodulation signal gold level is controlled according to the wt
modulation wave level. EndPage: A method of narrowing the 2 lock range is hardly noiseimproved in the case of the scheme proposed by the inventor of the present invention as
described above which band-limits g ++. Further, the phase shift n of the demodulated signal due
to the band limitation occurs and the phase relationship with the main signal becomes worse and
the separation becomes worse. The S / N at the time of FM demodulation is determined by the
northern part C / N of the carrier level C and the noise level N of the modulated wave band, and
when the noise spectrum of the record does not change In the remarkable inner circumference,
the day / Nft judgment of the demodulated signal is performed only with the modulated wave
level, and the noise is improved by the recovery 14 (No. ii t-band limitation or level control, but
in practice the record cutting, record manufacturing etc. It works on good or bad.
If the noise spectrum is changing due to the quality of the record and the noise in the modulated
wave band is increasing, the noise improvement is over! llしくならない。 That is, it is not
necessary for El / N to reduce the level of the recovered fA signal even at the inner circumference
of the quality pui record, while the noise spectrum of the modulated wave band is increased at
the outer circumference of the poor quality record. Even though the level of the modulated wave
is large, the 87M is bad, and it may be better to reduce the level of the demodulated signal. Also,
when the level of the demodulation key is directly controlled at the modulated wave level, the a
@@@ code may be modulated by the envelope of the modulated wave. The object of the invention
is to provide a multi-dimensional signal reproducing apparatus free from the above-mentioned
harmful effects. The embodiments of the present invention will be described in detail with
reference to FIGS. Fig. 2 is a system diagram of one embodiment according to the present
invention. 9 in Fig. 2 7c <1) is a carrier desk, (2) is a pickup 6v + record (1) recorded in 45-45
system in sound groove of record (1) ing. The TZ + (TV + TQ) '(' d and TR + (TT-TQ) 'signals are
multiplexed as shown in FIG. The low pass F wave device (5R) (SL) of the 2 multiplex signals
reproduced from our pickup (2), that is, the 'rL + (T-d + Tg)' signal and the T * + (T-ar Ta) 'signal.
And the band-pass F wave device (4R) (4L), and the TpJ number is added to the equalization
circuit (5R) of the 5th to 5th characteristics of R, and the equalization circuit (5R) is also added.
The output of) is fed to the decoder σp. A Tc signal is added to the t7tR circuit characteristic
equalization circuit (5L), and the output of the equalization circuit (5L) is supplied to the decoder
(ii). Furthermore, for the demodulator (6R), (T'T-? lTg) 'signal is supplied to the demodulator (6L)
(T'C signal To> 1 signal respectively, and is demodulated by the demodulator (6R) (6L). n 几 TT +
TQ, TT-TG Ig TT and T19 <w clamps are obtained at the output of the sum / difference circuit
through the sum / difference circuit (7), and are added to the decoder circuit (b) via the deemphasis circuit (8M) (8L) to the left front of four speakers. ' ) R left backward (BL) l right
forward (? R) and the right rear (ER) signal, and the like are regenerated: f17t is the QMX
regenerator. In the non-invention, the circuit shown by the dotted line is attached to the abovementioned circuit configuration shown in FIG. 2 and the control voltage detection circuit v (10R)
(IOL) is a level control circuit 6t). The level control 3 circuit (10R) (10L) is connected between the
de-emphasis circuit (8R) (8L) and the decoder circuit (11), and the control voltage detection
circuit is the output of the equalization circuit (5R) (5L) F De-emphasis (5R) or (5L) F's input VC
is processed to obtain a control voltage 1c, and the control voltage is configured to control the
wholesale circuit (10R) (10L) by level control.
These control voltage detection circuits (9) will be described in detail in FIG. Now, in the
definition of the decoder circuit αp, the TΣ signal is obtained using the 'rL + T17 signal, and the
tone level is low or it is determined by the level of the fTΣ signal, as shown in FIG. A circuit (9G)
obtains a T 倍 signal, and in addition to a T 両 signal double wave rectifier circuit (9b), detects
both waves and then determines the detection voltage as a threshold and generates a level
detection circuit m (1) such as nine clippers Pulse voltage t4. The pulse 4 pressure is used as a
latch pulse of the comparison circuit (9 fl) C9 f *) (9 fs), while the demodulation signal T or the
Tg signal gold wave circuit 9 #) is arranged in parallel with the detected voltage. Comparison
circuit (9 / I) (9 /!) ) (EndPage: 39f,) to each one input terminal. Also, in the comparison circuit
(9/1) (9 / *) C9 fs, DC magnetic pressure Is +] 1 C * r Xs ("s <'I's <Flfs") corresponding to a
predetermined 8 / N at one input terminal. ) Kahara E n! When the noise level is large, for
example, the comparison circuit becomes positive when the demodulation signal level is HsLv
large and TT signal small, and vice versa when noise is small. The comparison circuit is a FIBXT
that forms a variable attenuator within the level control circuit (10R) (10L) with the output '1' of
the output voltage that holds the output voltage before the disappearance of the latch pulse as
the control voltage. Added to the gate TT 9 TQ (+ i! Control the issue level. FIG. 5 shows a system
diagram of a similar operation sound m using a soot / pull hold circuit (9σ) instead of the
comparison circuit of FIG. 4 and a TΣ signal is obtained by a sum circuit (9α), 1lli wave 倹After
wave detection with wave rotation l & (91)). The detection voltage is thresholded by a
threshold voltage detection circuit (such as a level detection circuit) to obtain a pulse to obtain a
pulse, which is used as a sample pulse of a pull / hold circuit (9g), while one detection circuit (9-)
The c season signal is level detected and added to the fc'It pressure t sample and hold circuit
(9g). The output voltage of the sample and hold circuit (9σ) is controlled by a level control
circuit (10R) (10L) vcUII as a control voltage, and the levels of TT and T91i are controlled. It is
also possible to use (TT-TG) 'tart, (Tt + Ta)' fx7 perforate detection ratio signal instead of 7 pieces
or T61 added to the comparison circuit or sample hold circuit. In the non-invention, noise
reduction is performed according to 8 / N of the demodulation signal because noise control is
performed according to 8 / N of the demodulation signal because the Tt and TQ signals are
stored at the low tone level and the T7 and TQ levels are controlled at the level of the
demodulation signal. It has the feature that it is possible to obtain an optimum reproduction
quality, and when dropout to a demodulated signal is easy, level control is performed, so that
dropout can be lightened.
As described above, the present invention has a great feature of being able to prevent the
deterioration of 13 / N at the time of low level F based on the carrier wave by the addition of a
very simple circuit.
BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is an overhead view for explaining the invention.
Fig. 2 is a system diagram of the present invention. 3 (a) and 3 (b) are explanatory diagrams of
frequency bands at the time of record allocation of the present invention. FIG. 4 is a system
diagram of the control unit of the present invention. FIG. 5 shows another control unit of the
present invention. (1) is a carrier desk, (2) U pickup, (3R), (3L) is a low pass F wave device 1 (4R),
(4L) is a band pass P wave device, (5R), (5L) I'i etc. Circuit. (6R), (6L) are demodulators, (7), (6)
are sum-and-difference circuits, (8L), (8R) are de-emphasis circuits + (9a) are rectification circuits
+ (9b) are level detection circuits (9C) Constant circuit, (10'L) (10R) is a level control circuit, CAn
is a decoder EndEndPage: 4