Patent Translate Powered by EPO and Google Notice 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 financial decisions, should not be based on machine-translation output. DESCRIPTION JPS5327001 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 10-05-2019 1 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 10-05-2019 2 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. 10-05-2019 3 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. 10-05-2019 4 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 10-05-2019 5
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