JPS5145503

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 JPS5145503
· · · · · · · · · · ·. 1, title of the invention 2, inventor, 3. Patent applicant 4, agent [phase] Japan Patent
Office ■ Japanese Patent Application Publication No. 51455030 published Japanese Patent
Application No. 51. (1976) 4.19 Japanese Patent Application No. 4 '? − / 18 g 1 1 g Office serial
number 346 231, title of the invention 1, title of the invention matrix decoder for 4 channels
Decoder for matrix 4 channel
Detailed Description of the Invention The present invention relates to a decoder for matrix four
channels. Conventionally, two types of systems have been implemented as a matrix four-channel
system. The first method is known as regular matrix to RM (QS) method, and the second method
is known as SQ method. Also, in recent years, a four-channel system called UD-4 system is being
implemented, and this UD-4 system is called BMX, and using a two-channel transmission system,
the four types of matrix four-channel system are substantially the same. In addition to being able
to perform matrix 4-channel transmission, recording and reproduction of the -2-4 system, it is
also called TMX, and it is made into 4-8-4 system using 8-channel transmission system to obtain
better separation than the above BMX, It is characterized in that it can be referred to as a drive,
and it can be used as a discrete 4 channel of EndPage: 1 / 4-4-4 system using a 4 channel
transmission system. That is, since this UD-4 system uses 8-channel and 4-channel transmission
systems in the case of 4-8-4 direct system and 4-4-4 system, respectively, a 2-channel stereo
transmission system is used. Although there are many differences between the above-mentioned
two conventional types of I) 7-channel 4-channel system, in the case of BMX of the 4-2-4 system,
the same type as the above-mentioned two types of matrix 4-channel system It can be said that it
is the @ 80 method of matrix 4-channel method. In this UD-4 record, the above-mentioned BFilfX
encoded signal is usually used as the main signal for both left and right channels, and the other
two encoded signals f according to the above-mentioned frequency: frequency modulation is
10-05-2019
1
performed on both left and right channels as FM subcarrier signals In addition, it is recorded by
taking out only the above-mentioned main signal and demodulating the FM subcarrier signal by
5BMX and adding it to the above-mentioned BMX reproduction signal enables performing
"discrete reproduction" by QMXK. It is like that. Therefore, at present, a large number of records
recorded by the above eight types of systems have become commercially available, so that the
reproducing apparatus should be able to reproduce any of these records in accordance with the
respective appropriate systems. Not--it would be very uneconomical if the playback device had to
have separate decoders suitable for each of the above schemes. Therefore, the object of the
present invention is to provide a decoder for matrix 4 channel which can be compatible with 8
kinds of matrix systems of RM (QS) system, SQ system and BMX according to UD-4 system by
sharing most circuit configurations. And
Before describing the decoder * vi according to the present invention, various signals related to
the RM ('QS) system, the SQ system and the BMX system according to the UD-4 system will be
described. Assuming that the 4-channel original signal is respectively LF (forward left), RFC
forward right square LB (back left) and RB (i square), 2-channel signals LT1 and RT1 encoded by
RM (QS) scheme respectively It is indicated as follows. 4-channel reproduction signal LF obtained
by deconiding these 2-channel signals; LB 'and RB1 are usually indicated as follows. ··· (2) In
addition, a 2-channel engineering code signal LT2 and R, R,. Each is shown as follows. Fourchannel reproduction signal LF ′ 2 obtained by decoding these two-channel signals. RF /, LB'2
and RB6 are usually indicated as follows. On the other hand, the BMX2 channel engineering code
signals LT5 and RT3 according to the UD-4 system can be expressed as follows. L、
3−6 LF+QA。 WRF+el− LB+0,4 3− #RB)・・・
(5)RT3=+3− TRF+046− %LF+。 "RB + Q4 ej TLB" The four channel
reproduced signals LFQ, RF'5, LB'5 and RB'3 fi obtained by decoding these two channel signals
can be expressed normally as follows. EndPage: 2] Next, with reference to the drawings, the basic
configuration of the decoration according to the present invention will be described. In the
figure, 11 and I2 are input terminals to which 2 panel signals, r (i.e., LT1 + L-r2 or 3) and RT (i.e.,
"TI" T2 or R) according to the above-mentioned respective systems are given, respectively. 14.15
and 16d are first to fourth changeover switches interlocking with each other with the
corresponding push contacts 1, 2.3. And I2 and 18? · When the contacts 13 are switched on the
basis of the input signals 9 LT and RT respectively, when the contacts 13 are switched, the sum
signal LT + RT is outputted upon receiving the signals LT and RT, and the changeover switch 13
receives the contacts 2 and 3 The first matrix circuit which receives the signal RT ヲ and outputs
O + RT, ie, R1 when switched to the output signal of the first matrix I) circuit 19 is supplied to the
.phi .. ± .00 phase shifter Iff, 1g. On the other hand, the signal is fed to the φ + 90 ′ phase
shifter 20 having a +90 ′ (= j) phase shift 4I and is advanced in phase 900.
On the other hand, when the second changeover switch 14 is switched to the contacts 1 and 2,
10-05-2019
2
the signal 21 receives the signals LT and RT through the .phi .. ± .0 phase shifter 11.18ff,
outputs the sum signal LT and RTi, and The signal LT obtained through the .phi .. ± .0 DEG
phase shifter 17 when the changeover switch I4 is switched over by the contact 3 # / c and the
.phi .. ± .900 transfer device 20, ': at 900 for the signal LT. In response to the output signal of
the advanced IIEI matrix circuit 19, ie, JR a, sum signal LT + JR? A second matrix circuit for toutput, 22 is the above-mentioned signals LT and R? when the second changeover switch 14 is
switched to the contact 1.2 as described above. ヲ receive both Ki! The above signals LT and JR
when switched to point 3? , And an eighth matrix circuit that outputs a difference signal, r−R,
and LT−j ˜. Further, 23 is composed of a resistor 24.25 and the eighth changeover switch 15,
and when the switch 15 is switched to the contact point 1, the output signal of the eighth matrix
circuit 22 is received when the switch 15 is switched, and this is output as it is And the level
variable switching circuit of 1, which divides the output signal of the Ix circuit 22 by the resistors
24 and 25 and outputs it when the contact point 2 ° 3 is switched, and 26 is a resistor 21 28
and the fourth changeover switch 16 described above, and when the switch 16 is switched to the
contact 1, it receives the output signal of the .phi. + 90.degree. This is a second level variable
switching circuit which receives the output signal of the second matrix circuit 2.1 when it is
switched to 3 and divides it by resistors 27 and 28 to output. Further, 29 is a fourth matrix
consisting of a summing circuit in which resistances 30.31 of equal values are connected in
series and a subtraction circuit in which resistances 32.33 and inverters 34 of equal values are
connected in series. Receiving the outputs of the matrix circuit 21 and the first level variable
switching circuit 23 described above, and outputting the reproduction signal LF ′ from the
connection point of the resistors 30 and 31 and reproducing from the connection point of the
resistors 32 and 33 Output signal RF '. Reference numeral 35 denotes a summing circuit in which
resistors 36.31 of equal values are connected in series, and resistors 88. of equal values. . 99 is a
fifth matrix circuit comprising a subtraction circuit in which an inverter 40 and an inverter 40
are connected in series, and receives the outputs of the eighth matrix circuit 22 and the level
variable switching circuit 26 of? The reproduction signal LB 'is output from the connection point,
and the reproduction signal RB' is output from the connection point of the resistors 38 and
39EndPage: 3 '.
41.degree. 42.43 and 44 are output terminals for outputting the reproduction signals LF ', RF',
LB 'and RB' respectively to the outside. The contacts 1.2 and 3 # 'i of the first to fourth
changeover switches 13, 14.15.16 correspond to the SQ system, the RM (QS) system and the UD4 system (BMX), respectively. Next, the decoding operation in the above configuration will be
described sequentially for the SQ system, RM (QS) system and UD-4 system (BMX). First, in the
case of performing SQ system reproduction, that is, the first to fourth changeover switches Z,? ,
74, 15 and 16 are switched to the contact point I, the signal and RT are input to the first I) I
circuit 19 and this output signal LT + RT is phase advanced by 900, j (LT + R, r ) To the fifth
matrix circuit 35. Further, the signals LT and R7 are inputted to the second matrix circuit 21 and
the output signal LT + RT is given to the fourth matrix circuit 29. Further, in the eighth matrix
10-05-2019
3
circuit 2.2K, signals are similarly applied to the fourth and fifth matrix circuits 29 and U35,
respectively. Further, in this case, the input 2-channel engineering code signal LT and RT are LT2
and RT2 shown in the equation (3). Therefore, it will be apparent that the front reproduction
signal LF'f1 output from the output terminal 41 is expressed as follows. LF '= v2 (LT 2 + Ft) +
172 (LT 2-RT 2)-= LT 2-(7-]) The forward reproduction signal RF' output from the output
terminal 42 is shown as follows: RF '= 14 ( LT2 + RT2)-112 (t, -Ra2) = RT2 ... (7-2) LF5 and BF
obtained by the conventional SQ decoder shown in the above-mentioned forward reproduction
signal LF 'and RF'Hl respectively. It is exactly the same as /. Next, in relation to the rear channel,
the rear left reproduction signal LB'H output from the output terminal -43 is indicated as follows.
LB '= ■ (LT2-RT2) Tomachi (LT2 + RT2)-children "r2" T2 "T2-jLY2) = children-j1, 4f, B + LF +
JRF-(-1 ALB-j LF + RF)) water 1 = h <2e-4 LB + 1 .484 LF. □、、、jvRF)=。 − tLB。
。、qe *Lv。。、7 jイRF=e−j′T(LB。 j(L7LF+Q、7RF)00.
−11. (7-8) The rear right reproduction signal RB 'output from the output terminal 44 is
expressed as follows. RB ': 碓 (L? 2- to 2)-Tumor j (LT 2 + RT 2) = 〒 2-j "y 2-(R 72" j L 72)) (2 °).
8.□4 −jへ、。 14 ° -j (圃 = 6-jtRB; 67 ° -j ¥ RF + OJ. -Nine.
=e−4(FLaga7ar+B7i、F)0. The above-mentioned rear channel reproduced
signals LB 'and RB' are LB 'obtained by the conventional 8Q decoder shown in the equation (4),
and aB', respectively, by -i, that is, -46. This corresponds to the phase shift, and the above LB 'and
RB' are slightly different in phase but completely the same in signal configuration and separation.
J Next, the case of performing RVI (QS) playback will be described. In this case, the @ 1 to the
fourth changeover switches 13, 14.15 and I6 are switched to the contact 2, and the first switch is
disconnected from the I.sup.k circuit 19 and the .phi. + 900 phase shifter 20u circuit system,
Signal circuits LT and RT are both applied to matrix circuits 21 and 22 vc of 2 and @ 8. The
output signal LT + RTIfi of the @ 2 matrix I circuit 21 is supplied to the fourth matrix circuit 291
C and the voltage is divided by the second level variable switching circuit 26 and supplied to the
fifth matrix circuit 35. Further, the output signal LT-RTu of the eighth matrix +7 circuit 22 is
supplied to the fifth matrix circuit 35 and divided by the first level variable switching circuit 23
and supplied to the fourth matrix circuit 29. Ru. Here, the resistance value of the first resistance
24.25), the second level allowance f 911, and let 27'R 28 be the resistance EndPage of the
resistance 24.25 (4 resistance value), respectively. Further, in this case, the input 2 channel
engineering code signals L and RT are LT shown in the equation (1). And RTl. Therefore, in the
case of the RM (QS) system reproduction, the front left reproduction signal LF 'outputted from
the output terminal 4 is expressed as follows. LF two% 4 (LT1 + FtT, + f (LTl-Rtl)) motorcycle C1 +
f) LT1 + μ (1-f) R? ,... (8-1) Also, the forward cloth return signal RF 'output from the output
terminal 42 is shown as follows. 8F ′ = 澗 (LT, + RT, −f (LTl−RT,):) = A (1 + f) RT, +% (1−f) L,
1,...,-, (8-2) In this case, (1 + f) :( 1-f) 2 x: o, 4r are added, that is, when the voltage division ratio f
is set to about 0, 4, the reproduction signals LF 'and RF' are respectively LF '. = LT, + 0.4 RT, ... (81 ') RF' two RT, + 0.4 LT, ... ... (8-2 ') (2) exactly the same as LF ′ and RF ′ obtained by the
10-05-2019
4
conventional aM (QB) decoder shown in FIG.
Next, the rear left reproduction signal LB 'output from the output terminal 41 in relation to the
rear channel is shown as follows. LB '2 (LTl-RT, + b (La 1 + RT1)) 2 (1 + b) LTl-' A (1-b) RTl ... (88) Also, the output terminal 44 The rear right reproduction signal RB 'output from the signal is
shown as follows. RB ′ = 捧 (LT, −aT1-Mt, T1 + gT1)) = − (′ A (1 + b) RT − ′ ′ A (1-b) L,
r,),... (8−4) In this case, if (1 + b) :( 1-b) = 1: 0.4, that is, if the voltage division ratio is set to about
0.4, the reproduction signals LB ′ and RB′H1 can be respectively LB ′ = LT1−. 04R ,. = E ′
′ r (−j3LTj−a4IRa,>) −−−− cs−8 ′> EtB ′ knee (RT, −ALTALT) == e3Σ (j (RT1−0, 4L))
····· --- --- --- (8-4 ') becomes LB'1 and RB'1 obtained by the normal RM (QS) decoder shown in
equation (2) 2-(= j), that is, +90. It corresponds to the phase-shifted one, which is slightly
different in phase from the LB1 and RB ', but the signal configuration and separation are
completely the same. Next, the case of performing UD-4 8MX reproduction will be described. In
this case, the first to fourth switching switches yf13, 14.15 and 16 are switched to the contact 3,
and the φ ± θ ° phase shifter 18 connected to the input terminal 12 is disconnected from the
circuit system, Only the signal RT is input to the first matrix circuit 19, and this signal is
advanced by 90 ° by the φ + 90 ° phase shifter 20 and is sent to the second and eighth mad
circuits 2 and 22 together with the signal LT as the signal j〜. Supplied. The output signal LT +
JRT of the second matrix circuit 21 is supplied to the fourth matrix circuit 29 and divided by the
second level variable switching circuit 26 as in the case of the RM (QS) system, so that @ 5 It is
supplied to the matrix circuit 35. The output signal LT-j of the eighth matrix Ux circuit 22 is
supplied to the fifth matrix circuit 35 and divided by the first level variable switching circuit 23
and supplied to the fourth matrix circuit 29. Be done. Here, it is assumed that the voltage division
ratios f and b in the first and second level variable switching circuits 23 and 26 are both set to
about 0.4, as in the case of the RM (QS) system. Also, in this case, the input 2-channel
engineering code signal, and RT are "T3" and "T5" shown in the equation (5).
Therefore, in the case of the 8MX reproduction of the UD-4 system of the present invention, the
front left reproduction signal LF 'outputted from the output terminal 41 is shown as follows. LF
'= 腋 (LT5 + JRT3 + f (LT3-JRT3)) = 鼾] + f) LT3 + marine (1-f) RT3 where (] + f) :( 1-f) two]: 0.4, so
LF' = LT, + JOA + R. Also, it is indicated that the front right reproduction signal RF'll''lt output
from the output terminal 42 is missing, ie, e-'rL, + o4e'sa,> ..-.- <9-1>. RF "two" (LT3 + jaT3-fcLT3JRT31) = 'Aj (1 + f) R, deca (1-f) LT3 where (1 + f): (1-f) = 1: 0.4, so RF' "JRy5 "(M! LT3=。
jイ。 jl :, -jl, (aT5 + o, + e8T, T)---------(9-2) Next, the rear left reproduced signal LB 'output from
the output terminal 43 in relation to the rear channel is Indicated as follows: EndPage: 5. LB '2%
(L,-JRT 5- + b (L D + JRT 3)) 2 μ (] + b) LT,-bar j (1- b) R. Here, N + b): (1-b) = 1: 0.4, so LB '= LT3JOART3 = 8-jt (e'tL, 3 + 0Ae- "fR,)-----(9-8) The rear right reproduction signal 8B 'output from the
output terminal 44 is shown as follows. RB /: 1 (L, r3-JRT, -b (Ly3 + JR, r5)) =-'Aj (1 + b) R, +% (1b) L, r3 where (1 + b): (1-b) = Since it is 1: 0.4, RB ′ = − J ′ ′ r 5 + prefecture L □ 4-j
10-05-2019
5
(difference e (6 R, + OA e LT 3)... (9 4) Therefore, the above four channel reproduction signal LF
′, RF ". LB 'and RB' are respectively LP ', RF', LB'3 and RB'3 '! Obtained by the normal 8MX
decoder in the UD-4 system shown in equation (6). This corresponds to the phase shift of the
above-mentioned LF′3 * RF ′, LB′3 and RB, corresponding to eg ITSI 8 and phase 1, ie, +
22.5 °, + e 7.5 ′, −22, 508 ′ and −67, 5 ′. Although the phase is slightly different from '3',
the signal configuration and separation are exactly the same. From the above description, the
decoder shown in the figure is effective as an SQ matrix decoder, an RM (QS) decoder and an
8MX decoder of the UD-4 system from the first to fourth switching switches 13.1.4 and 15.16. It
will be understood that it works. In the above description, the decoding operation in each matrix
system is substantially the same as the decoding operation by the basic matrix, but a variable
gain amplifier, for example, is used instead of 1g1 and the second level variable switching circuit
23 in the above configuration. It is used as a level varying means, and in conjunction with the
first and second changeover switches 13.14, the bias of the variable gain amplifier is changed to
amplify luml!
A determination circuit is provided which changes the range t- and determines the direction
component of the input 2-channel signal, and is output from the determination circuit. The
matrix variable control method or # -1. Gain logic control method control is better as a decoding
operation is performed to obtain better separation * a. It is needless to say that the minute
invention can be implemented with various modifications without departing from the scope of
the invention. As described above, according to the present invention, most circuit configurations
are shared, and it is possible to adapt only by switching the switch to eight types of matrix
systems of RM (QS) system, SQ system and UD-4 system (BMX). Can provide a decoder for the
matrix 4 channel.
4 is a circuit diagram showing an embodiment of the present invention. 13.14, 15.16-· · First to
fourth changeover switches, 17.18 · · · φ ± θ ° phase shifter, 19 ° 21.22, 22. 35 · · · 1 to 5
Matrix circuit, 20 ... φ + 90 ° phase shifter, 23. 26 ... first and second variable level switching
circuits. EndPage:6− 。 1 1S,-: 1 □ -5, List of Appendices 6, Inventors other than the
above, patent applicants and Rema agents, JP-A-51-45503 (7) 'EndPage: 7
10-05-2019
6