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DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a matrix four
channel stereo reproduction apparatus. The conventional matrix 4-channel stereo reproduction
apparatus mixes completely separated (separate) two transmission system signals (No. 2) LT, RT,
and the signals LF, RF, LB, 4-direction according to their blending ratio Synthesize and take out
RB, and input them to speakers arranged in 4 directions to reproduce a 3D reproduction sound
field. That is, FIG. 1 is a cutting vector diagram of a so-called 45-45 system disc record, and in
the figure, CL and CR are vector diagrams of binary signals similar to those for conventional twochannel stereo reproduction, The CL is recorded at an inclination of + 45 ° and the CR at an
angle of 45 ° with respect to the horizontal axis, and the sound image is localized at the left
center and the right center of the listener, respectively. Then, CF is a vector of signals recorded
by inputting the cutting input in phase and at the same level in the horizontal direction, and this
signal localizes the sound image in the front center of the listener. Further, CB is a vector of a
signal recorded by inputting the cutting input in the reverse phase and at the same level in the
vertical direction, and this signal localizes the sound image to the rear center of the listener. A
disc record subjected to such cutting is used as a signal source, and one of the methods (3)
(hereinafter referred to as matrix method (1)) for extracting signals in four directions is as
follows. That is, Lf is a signal taken out to the left front, right front, left back, and right back fourway channel. The structures of Rf, Lb and Rb are expressed by the following equations. Lf =
0.92LT + 0.38RTRf = 0.92RT + 0.38LTLb = -jO, 92LT + jO, 38RTRb = jO, 92RT-jo, 38LT This can
be represented as a vector diagram as shown in FIG. That is, Lf and Rf are taken at + 22.5 ° and
-22,5 ° respectively with respect to the reference horizontal line OG (so that the included angle
between Lf and Rf is 45 °), Lb is further + 45 ° from Lf, Rb Are positioned respectively in the
direction of 45 ° from Rf. Therefore, the included angles between Lf and Rf, between Rf and Rb,
between Rb and Lb, and between Lb and Lf are constant at 45 °. Assuming that this included
angle is θ, the separation S between each channel is (4) ′ ′ (dB) −2010 F (QOs 45 °) −− 3
(dB), and the separation is not sufficient between any of the channels . There is another example
of the above-mentioned matrix system (hereinafter referred to as matrix system (2)).
FIG. 3 is a vector diagram of this method, and as can be seen in comparison with FIG. 1 and FIG.
2, four signals in the original sound field are converted (encoded) into binary signals LT and RT
completely separated. The method and the decoding method for extracting signals in four
directions from this binary signal are different from the matrix method (1). That is, the left front
signal LP of the original sound field and the right front signal RF are cut as orthogonal vectors in
the 45 ° direction as in the conventional two-channel stereo reproduction, and the left rear
signal LB1 right rear signal RB is 45-45 It is cut with a 90 ° phase difference on both walls. Due
to this Phase difference, the left rear signal LB is turned in the clockwise direction,
and the right rear signal RB is turned in the direction of the 7-piece clock tI 'IE (helical
modulation). The binary signal LT, RT encoded in this manner (5) is expressed by the following
equation. LT =-jQ 707 LB + LP + α 707 RBRT =-0, 707 LB + RF + j (1 707 RB A binary signal LT
obtained using such a cut disk record as a signal source, left front and right front extracted from
RT (using basic decoder) The left rear and right rear signals are represented as Lf, Rf, Lb and Rb,
respectively, and their configurations are represented as follows. Lf = LTRf-RThb = 5C, o 7 o 7
LT-0, 707 RTRb = Q 707 LT-jO, 707 R 1 From this, the seven valleys between the front left and
right channels (Lf and Rf) and between the rear left and right channels (Lb and Rb) are good ( It
is theoretically infinite, but the separation between left bank front and rear channels (1, f and Lb,
R character correction f and Rb) and diagonal channels (Lf and Rb, Rf and Lbilj) is 3d (·) B and not
enough. As described above, the two different matrix systems have been described, or, currently,
separation improvement measures (dedicated) adapted to the respective matrix systems are
taken, and crosstalk between each channel is not disturbed at all. It is pressed down. However,
since the two methods differ in encoding method and decoding method, they are not compatible
with the program source, especially with regard to backward sound. That is, as can be seen from
the cutting vector diagrams of FIGS. 1 and 3, both cutting vectors are similar with respect to the
signal located between the front left signal and the front cloth signal and the rear center signal.
(In the same plane), it is recognized whether temporary compatibility. With regard to the rear
signal, in matrix method (1), the movement (cutting direction) of the reproducing needle is
longitudinal, while in matrix method (2), the movement of the reproducing needle is rotational
movement in clockwise and counterclockwise directions. (Helical modulation) and both methods
are not compatible since they are completely different in this respect.
For example, when there is a signal of 1.0 (7) value as the left rear signal LB. (A) A binary signal
L〒l encoded with matrix method (1), RTI, a signal in four directions (to be synthesized by the
decoder of matrix method (1)) LP (1) 4) signals synthesized by the decoders of RF (1), LB (1), RB
(1) and matrix method (2) are LF (2) IRF '(2) ILB (2) IRE (2) And its value (! Bell and phase) are LB
(1) -1,00LLF (1) = j0.707RF (1) -o, o.
)=−jo、38RB(2)=−0,27+j0.65となる。 Considering only the absolute
value of the signal this winter, LB (1) -1, LP (1) = 0.707. Although RF (8) (1) -0 and RB (1) =
0.707 should be reproduced, LB (2) = 0.707, LP (I) when reproduced by another decoder (matrix
method (2)). 2) = 0.92. RF (2)-0, 36, RB (2)-0, 7 (17, and the reproduction level is the maximum
value of LF (2), and the phase relationship is also completely different, and as a result, the input
signal It is reproduced with a sound field pattern which is completely incompatible with the
encoding method. Of course, the localization of the sound image is not completely fixed. (B)
Conversely, a binary signal LT2. For RT2, a signal in four directions (to be synthesized by the
decoder of matrix method (2)) to be reproduced originally is LF '(2). The signals RF '(2), LB' (2),
RB '(2), and signals in four directions synthesized by the matrix-socx system (1) are LP' (1) IRF
'(1) ILB' (1) Assuming that IRB '(1), the values (level and phase) are LB' (2) -1,0 OLF '(2) =-jo, 707
(9) RF' (2)-0,707 RB / ( 2) 冨 0, 00 LB '(1) = -0, 65-jO, 27 LF' (1) =-0, 27-jo, 65 RF '(1) =-0, 65-jO,
27 RB' (1)- It becomes -0, 27-jo, 65. Originally, LB '(2) -1, LFJ (2) = 0.707. If it is regenerated with
RF ′ (2) = 0.707 ° RB ′ (2) −〇 or it reappears with matrix method (1), LB ′ (1) −LF ′ (1)
−RF ′ ( 1) -RB '(1)-0, 707. That is, since the signal of the same level is reproduced from four
directions and the phase relationship is also completely different, the pattern of the reproduction
sound field is the encoding of the human power signal as described above. Unlike the method,
there is no localization of the sound image at all.
As described above, the numerical examples for LB doubled signals have been described by way
of numerical example, and the same applies to the signals of left center CL, right center CR, and
right rear Rh, and both methods are incompatible with program sources. Therefore, in the case of
a stereo reproduction set requiring two types of decoders and having only one type of decoder
for reproduction of a matrix four-channel record, there is a drawback that the type of encoding
method of the four channel record is limited. The appearance of a 4-channel decoder capable of
sharing the program source of the system is desired, and the actual original sound field is located
at the center of the front, which is the main instrument, or the main instrument. It is common to
be located in the open. In particular, separation between front left and right, front center-back
center is required to be reproduced well. The present invention solves the above-mentioned
drawbacks, and in matrix-type 4-channel reproduction, between each channel for input binary
signals of two types (matrix types (1) and (2)) different in encoding type The cross-Z can be
reproduced equally, and the program / letter nm source of the above scheme can actually be
shared, and / or the unnecessary two channels' signals are in opposite phase and at the same
level. And a decoder matrix circuit that can be completely canceled out electrically by adding a
logic circuit, and can be reproduced with substantially the same pattern as the actual original
sound field. The invention will be described below with reference to the drawings. Two kinds of
binary signals LTI represented by the following equation. RTI (matrix method (1)) lLT2. Consider
an operation of converting (decoding) RT2 (matrix method (2)) into signals in four directions
(channels). In the matrix type (1),
-jo, 92 L , 1 ° t 92 LF + (L ° ′ ′ 1 °°°°°), 8
cycles ゎ RT 1 = −jO, 38 LB + 0.38 LF + 0.92 RF − jO, 92 R In the matrix method (2), LT2 = -jO,
707 LB + LOLF + α 707 RB-ψ) RT2 = -o7 o 7 LB + LORF + j (L 707 RB). Here, LB, LP, RF, and RB
are the signals behind the original sound field (left), left front, right front, and right rear in the
matrix system (2) decoder. The equation is expressed by the following equation. Lb! = JmlLTm2RT-working Rh '= Ill2LT-jmILT Here, the mixing ratio of the binary signals LT and RT is
defined as g / mx, and for convenience, the angle θ (-jan "(m2 / ml) corresponding to the mixing
ratio Lb '= j cos .theta. LT-sin .theta. RT-(G) Rh' = sin l ILT-j cos ORT.
Here, the cross talk S (θ) between the rear right and the left is considered. For example, if there
is a signal with a value of 10 in the LB channel, (a) binary signal LTt = jo encoded by matrix
method (1) 92. The backward signal when RT1 = −JO 138 is (2) L ′ ′ = − a 92 cos # + jα 38
sin θ R ′ ′ ′ = jO, 92 sin θ + a 38 CCS 5 and therefore the crosstalk S 1 (θ) to the Rbl
channel is. :::: North e] (represented. (B) Matrix signal (2) Encoded binary signal LT2 = -jO, 707,
RT2--0.707 The backward signal is Lb '= 0.707 (cose + sin.theta.) Rh' = jO, The crosstalk s2
(.theta.) To the Rb 'channel is represented by CO8.theta.-5 in.theta.s2 (.theta.)-. Quadrature.COS
.theta. + 81 n.theta. Therefore, when the values of Sl (θ) and S2 (θ) are taken on the vertical axis
and the angle θ corresponding to the mixing ratio is taken on the horizontal axis from (a) and
(b), it becomes as shown in FIG. From this, when combining the 02 original signal L l l and RTI
and combining the backward signal, 0-00, that is, the mixing ratio a + 2 / ml = 0/1 and mixing is
good. Q41) Conversely, when mixing the binary signals LT2 and RT2 and combining the
backward signal, it is ideal to mix at θ '-45 °, that is, the mixing ratio m2 / ff1l = 0.70710.707
(S2 (45 ° )-○). In the conventional matrix method (2), a binary signal LT2. Assuming that RT2 is
to be returned again, in order to make the separation between the rear right and left good
(theoretically infinite), it is selected as θ = 45 °. However, for this reason, binary signals LT1
and RT11 any-coded in the matrix system (1) (as opposed to separation between the rear left and
right) could not be obtained. Here, the meaning of FIG. 4 is that the input binary signal LT1.
RTIおよびLT2. For both RT2, the angle θ reproduced with equal crosstalk of the
backward signals LbL, Rb 'determines the mixing ratio to make the program source compatible,
and the angle θ is sl (θ) JS2 (θ) Intersection point P of the However, if the difference between
the crosstalk S1 for the binary signals LTI and RTI and the crosstalk for the binary signals LT2
and RT2 is about 3 dB, there will be no aural problem. Therefore, the angle θ for reproducing
and compatibility in a state in which both can be satisfied should be within the range of θ = 1323 ° (mixing ratio m2 / 1111-α23 / α97-Q39 / (L92) .
An embodiment (θ = 22.5 °, + n2 / m1 = 0 ° 38.10.92) of the decoder matrix circuit satisfying
the range of θ will be described. In the block diagram of FIG. 6, in the binary signals LT and RT
inputted (1) LT, a signal Lf 'on the left front side is constituted. (2) At RT, a right front signal Rf 'is
formed. (3) After mixing the signal LT 'delayed by 90 ° phase only with another signal RT and
the other signal RT in the ratio of 0: 92: 0.38 by the matrix circuit 1, the phase is reversed and
the signal Lb' at the left rear is inverted. Configure. (4) A signal RT 'delayed by 90 ° in phase of
RT alone and another signal I%? Are mixed at a ratio of α (to) 9z: (L3Jl to form Rbl. The 90e ′
phaser is a circuit known in the prior art and the following equations (1) to (4) can be expressed
as follows: become that way. Lb '= j1192LT- + 138RTLf'-LT.div.MRf'-RTRb'-Q, 38LT-jQ, 92RT (V)
The binary signal LTI, Rτ1. LT2. Four-way signals Lfl, Rfl, Lb / obtained by inputting RT2.
The theoretical values of Rb 'are shown in Tables 1 and 2, and an example of the matrix circuits
1 and 2 is shown in FIG. As can be seen from Tables 1 and 2, signals Lb ', Lfs, Rfl and Rh' of four
directions are substantially corresponding to binary signals LTI, RTI, LT2 and RT21 encoded by
different encoding methods. It is reproduced in a well-balanced manner in terms of crosstalk,
amplitude, and phase between channels, and the salient features include (b) (a) input binary
signals L'l'l, R of matrix method (1) ? For l, the backward signals to be synthesized are in antiphase relation to each other: unnecessary two channel signals or anti-phase same level to the
front center sound CF and back center sound CB, It can be completely canceled electrically. (B) In
the matrix method (2), the rear signal uses a 90 ° phase difference to improve the separation of
the left and right rear sound, as can be seen from the (n) expression. However, the input binary
signal LT2. Also for R'l'2, the unnecessary 2 □ channel signals are in antiphase and at the same
level relative to the front center and center sound cr and the back center sound CB, so that they
are completely beaten electrically. You can erase it. And so on. Furthermore, since the signal of
the four directions synthesized in this way has features such as the above (a), l (b) etc., by adding
a logic circuit, the logic operation is ensured, and in particular There is an effect that the
separation (right and left), the rear left and right, and the front center-rear center separation is
good, and it is possible to obtain a reproduced sound field having substantially the same pattern
as the actual original sound field.
Thus, in the decoder matrix circuit of matrix system (2), the present invention actually uses two
types of binary signals (matrix systems (1) and (2)) of different encoding systems by limiting the
matrix constant. In addition, the signal is reproduced in good balance in terms of amplitude and
phase to solve the problem of program source compatibility which is a disadvantage of the
conventional decoder matrix circuit, and further an unnecessary 2-channel signal for the input
signal. It is possible to obtain a reproduction sound field of almost the same pattern as the actual
original sound field by adding a logic circuit, which has been used in reverse phase 1 [11-level
mutually or by adding a logic circuit] It is a decoder matrix circuit.
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