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JPS4835301

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DESCRIPTION JPS4835301
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a conventional signal
transmission apparatus, FIGS. 2a and 2b are diagrams for explaining FIG. 1 respectively, and FIG.
3 is an embodiment of the present invention. 4 is a block diagram showing an encoder in the
embodiment, FIG. 5 is a phase characteristic diagram of a phase circuit used in the encoder, and
FIG. 6 is a block diagram showing a decoder in the embodiment. FIG. 7 is a phase characteristic
diagram of a phase circuit used for the above decoder. DESCRIPTION OF SYMBOLS 10 ........
Original sound field, 11 ..... Encoder, 12-17 ..... Phase circuit, 18, 19, 21.22 ..... Mixing circuit, 28.
29 ... Transmission system. Fig. 2 (&) SFLSFR '@ one ") 1 / \ x ● \ no P ~. One SR L SR R (b) 1
° ′ ′ ′ ′ df \ X \ 5 0 188 188 = 1 昭 48-35 301 (2) Fig. 4 Fig. 4 狂 s. 13 ′ ′ 12, 15, IG,
17141010′10 · 10 ′ ′ “number 2-actual opening 48-35301 (3) FIG. 6 FIG. 7 FIG. 0 One
round Tomako 5, 33.3 (5” ”-34-3 -
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal
transmission apparatus used, for example, when performing broadcasting, recording and
recording on a record board, recording and reproduction on a tape recorder, and wired / wireless
transmission. Recently, for example, in stereo broadcasting, a system is considered in which a 4channel signal is converted into a 2-channel signal and transmitted, and this is received and
converted into the original 4-channel signal to be retransmitted. That is, as shown in FIG. 1,
microphones NFL at the four corners of the original sound field l. MFk, MILL, MRR are
distributed and collected, respectively, and 4 channel signals PL, FA, RL. Get this RR 4? Yannel's
signal PL, FR. In particular, the RR is led to the encoder 2 and converted to the following twochannel signal and tool, respectively. Ll−PL+7FR−BL−48m1&、
−FA+iPL+Bl+JAL3−L−∼21. snow. 35.3E11. -, Q break 2. . 1
However, said signal no FR, no RB, dPL. Each of the RLs is the above-mentioned 嶋 channel signal
FL. It is a minute signal proportional to FB, RL, and RR. Then, the above-mentioned 3 channel
signal, ja, is transmitted to a predetermined part by @ transmission S system J, 4 respectively.
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This transmission system 1112 * 4 comprises, for example, a broadcast line or a recording /
reproducing system to a record board. The signal of 8 channels transmitted by this transmission
system M'S 'and R are led to the decoder 5 respectively, and each of the following signals is sent
to the decoder 7 (7) signals J'L, FIL, RL +, haRM. Convert. PL, -L 十 JR-J? LC1 + 4 ′ ′) + FR (24)
−RL (1−j ′ ′) FR, −R + 7L−FR (147 ′) + FL (BJ) + RR (1−j ′ ′) ML, mL−Δ 凰 1−RL (1 +
j−−1) LIL (BJ) + FL (1-jB 鵬 m wing-jLjLjL (1 + jj + RL (sj) + pi (1-j), where the above-mentioned
signals -L and In are respectively the above-mentioned-$-48-35301-043 channel signal H, a
small signal proportional to H, and the signal FL (1 + NORI is PL + (jPL)), t, T, T, signals PL, RL,
PR, of the four channels. In the case where the RR, is reopened 6, the microphones MFL, MPR,
MAL, M and B of the original sound field 1 are respectively enclosed and speakers 8FL disposed
at the four corners. It is intended to carry out 3D reproduction of the threat in addition to 8FB,
8L, 8BB. However, in the above scheme.
Since the sum and difference of the respective signals are 15 as appropriate, the sound-signal to
the substantially middle point X between the speakers 8FL and 8BL is canceled in the encoder 2
according to the third reed). Therefore, even if the signal of the above-mentioned three channels
is R, mFL + ΔFjL + RL−no [LR, −FR + Δ1 / L + RR-4 & Xa. 4B-353 [) 1-[) 5 and 1 ', the sound
and electric signal for the approximately middle point X between the 8F and the 811 as shown in
the encoder 2 of the encoder 2. Attenuation in the inside, the original localization can not be
obtained, moreover, the four channels of signals PL, 7B, j4L, AR are in phase and at the same
level, and four speakers JIFL, 8Fj J8iL, JIB 烏The place where you rang If these signals can be
transmitted properly, one can not perform normal recovery. This device was made in the light of
the above ◆ information. The purpose of this is to provide a signal transmission system capable
of reliably transmitting blue-blue signals at arbitrary positions and capable of transmitting well
even if all the channels have the same human power at the same time. It is Hereinafter, an
embodiment of the present invention will be described with reference to WJWJ. As shown in FIG.
8, microphones NFL and VFR are placed at the front left side, the front right side 1wk, the left
side, and the rear right side at the original bookstore io. The MRL and M1 winds are arranged
and collected to obtain 4-channel "4B-35301-06-black ink" signals FL, F and KL, R, respectively.
Further, the central left side microphone MOL and the central right side microphone MOR are
disposed corresponding to the middle between the microphones MFL and MRL and the MPR and
MAR, respectively, and the sound is collected for the front and the rear. Two left center and right
middle channels, that is, center channel signals OL and 0 C are obtained respectively. Thus, the
6y-channel signals PL, FB, RL, RR, OL, and OR of the 6y-channel described above are led to the
encoder 11, respectively, synthesized in a fixed phase relationship, and selectively selected from
the following 5fils 2-channel signals: Convert to and B, respectively. Uz knee pn + 1pL-<g (pmm +
onwFL + 7FB + / 9Q "RL + 0LCLtb-PL + / 9fiL + Z9fjBIL + OLR * i +-FIL-Z90" RR-j9G @ j island L +
OR6-1 + 2.4., Yyy "mze, 24.4 The, , 3530..1.7 [17, iC: C-PL + 19 (f "BL + 0 LC-FR-/ 9 (rj LR + OR
where the above signal is 10/90" Ls "190 'JRR is the signal ML, RR, etc. Shows the signal
advanced by 90 "with respect to the signal of"-/ 90 @ RB ".
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-Z9f-8L indicates a signal wind R and a signal obtained by delaying the signal RL by 9 de with
respect to other signals. Thus, the upper encoder 1 is, for example, as shown in FIG. 4) in the 1st
6th channel signal FL, FR, RL, RR $ Yohi OL, OR each broadband phase circuit 12 to JF. Apply.
The phase circuits 12.16, 1g, and IF make the phase characteristic short as shown in FIG. 5, and
the phase circuit JJ makes one phase amount 12.11 and 1g, 1F (0 position 111 IIII characteristic!
l) Those having a 90 @ phase shift phase characteristic, that is, the phase amounts are the phase
circuits 11, Ig and 1g, The phase 4 @@ path 14 uses the phase circuit 1 M, IM, J #, and JF 90 °
far out of phase from the phase circuit 1 M, using one having a phase characteristic 9 CIh more
than the phase amount of r. 35301-08, the output signals of the phase circuit 11.11 are
respectively applied to the mixing circuit l # and mixed, and the signal obtained from the mixing
circuit II together with the output signal of the phase circuit l #. The signal is applied to the
mixing circuit l # and mixed, and the signal or signal obtained from the mixing circuit l # is
applied to the output terminal 2 °. Further, each output signal of the phase circuit 14.11 is
applied to the mixing circuit 2 to be stable, and the signal obtained from the first mixing circuit is
also supplied to the mixing circuit 22 together with the output signal of the phase circuit JF. The
signal is applied and mixed, and the signal obtained from the mixing circuit 22, that is, the signal
B is applied to the output terminal 2J. On the other hand, a variable attenuation fence I5 is
provided between the input terminals of the phase circuits JJ and 14 via the switch 24 via the
variable attenuation all, and the minute signal line BL proportional to the signal through the
variable attenuation all is switched by switching the switch 24. Selectively in addition to the
phase circuit J4, also a minute signal j & 比例 proportional to the signal l 選 択 is also selectively
applied to the phase circuit 11. 661, ° "" 5 "" "-" "°" 1 "14, 7 'Ml' ::, j) 1.7, island L-4 f%-S" M 2 "
':! ': BS'! :: F 1 ′ ′ ′: A variable attenuator 2 r is provided to the 9 z 4 □ via the switch 7 g. A
minute signal proportional to the output signal of the phase circuit 12 is selectively added to the
mixing circuit 2 by the switching operation of the switch 26 through the variable reduction a771
and a minute signal proportional to the output signal of the position 41 circuit 71 is also
Selectively add to mixing circuit II. Therefore, with the encoder 11 having such a configuration,
the signal PL passes through the phase circuit 12 and the mixing circuit 18.19 when the switch
24 is turned off and the switch IC is turned on as shown in the figure. And the phase circuit 11.
スイッチ26. The usable attenuator sr and the mixing circuit 11.11 are respectively output as
an output terminal, and 2J is derived as a no FL, and the signal RL is respectively transmitted
through the phase circuit IJ and the mixing circuit 18, 1m to the output terminal 20 + z 90 @ RL
It is derived as II, the signal R is derived as -190 "llt at the output terminal 1- through the phase
circuit 14" and the mixing circuit sr, xz, respectively, ... -0-48-35301-103 .. jk, j (, ::::, j, “,”,. The
signal r & is led to the output terminal 2J as PR through the phase circuit IJ and the mixing
circuit 11.degree. Variable damping a22. Switch 2- and mixing circuit l #. Each of the output
terminals 20 is led out as a signal FR through an output terminal 20. 8らにまた。 Signal OL is
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derived as OL at output terminal 2 # through phase circuit J # and mixing circuit 71,
respectively, and signal O 轟 is phase circuit 1! And through the mixing-path 22 and is derived as
an OR at the output 2J. Next, when switch 24 is turned on and switch 2 # is turned off, the
signal! L is the phase circuit 12 and the mixing circuit 18. The signals are respectively derived as
j 'L at the output terminal 2 # through III, and the signal components are the phase circuit IJ and
the mixing circuit 18. Each of the switches 24 and 7 which are respectively derived by + iev
around the output terminal 2 # through III. Over the variable attenuator Ig, the phase circuit 14
and the mixing circuit 11.11, 1-121 "-" "" ':', a, m'4 hW-, a + 1, 2 terminals It is derived | led-out
as -z90 (degree) JRL to 2J. Furthermore, the signal 88 is variable. It is derived as + 290011M to
the output terminal 20 through the switch 24, the phase circuit IJ and the mixing circuits 1M
and III, and is derived to the output terminal 71 as -j90 @ R1L through the phase circuit 14 and
the mixing circuit 27.71 respectively. The signal FR is also derived as FB at the output terminal
23 via the phase circuit 15 and the mixing circuit xi, xz1, respectively. Furthermore, the signals
OL4 and OR are respectively OL at the output terminals so and zs as described above. It is
derived as OR. Next, when the switches 24 and 211 are turned off respectively, the signal PL is
derived as FL through the phase circuit 12 and 湧 8.1. # To the output terminal 20 °-ゝ ′ ′ ′
′ ILL is derived at the output terminal 20 as + Z90 @ lL via the phase circuit IJ and the warming
circuit 11, 1m, respectively.
Further, the signal R wind is supplied to the phase circuit 14 and the mixing circuit 11. : II), and(弄 one side, ',-: ",---, P, 1 J-j 90 ° It is derived as と し て 8, and the signal r bird swings to the
phase circuit 15 and the mixing circuit 11.111 respectively to the output terminal 2J! It is
derived as a tool. Furthermore, the signals OL and 0 are respectively OL at the output terminals
go and zx as described above. It is derived as C8. Therefore, the signal of 8 channels of 2
channels selectively obtained from each output terminal 20.22 of the above encoder 1; The
transmission system R2 #. Transmit to a predetermined place with j #. The transmission systems
za and zm are composed of, for example, a broadcast line or a recording / reproducing system to
a record board. This transmission system [7 #, 3 channels of signals transmitted by ffi #, and R,
are respectively led to the decoder SO. 4 channel signal pL, of slI class as follows. Convert FR, BL,
1B, 1: respectively. L! a ′ ′-L 黛 畠 +) ′ ′ ta − FL (1 10 j FR (! J) + j 9 ON j LT − − 鎚) +
OL + OB OB + ′ ′ “k”: “′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′: r, −s −
−,“, − − y, + Yo =? “* A−R * a + jLta−yB1 + /) + ttpL <xi, JQjRjL−JAL) + OMjOL”
ta−−j9f4L summer−no B1. )-5f (fL (1 + /) + aO "(RL-JRR) + 0L-jOR) iLRH-+ 190" (R 舖 j Lta)-m +
j 90 @ (FQI + 15jcf '(Bjj--JRL) 〇 &-jOL) “Lwb−L * b + IR1b−FX1 + 7F 訃 bQ” RL (1 − /) + 01.
+7QBfR,bswR,>+ノL、
b−yn+4iL+/e(IRR<1−/)+oi+7oLRLlb−−、? 90 @ (Lb-7R, b)aO "fFL-FR +, JCfRL (1-19 + 0L-) OR) BjL,>-+ 190" (4b-) L 冨,)-+, aO @ (PR-ilL -21 G% B (1-/ +) + 0
B-JOL) r L c-L m 41 + j "1 g-FL + 41 n + 75 f ML-417 m) + OL + 7 o R 18-column ... ... (, IQI
pregnancy · 4 B-35301-14 Flmc" Jhc " L Yukiichi! Tori Tenno FL-, JO "(R1 + 7) LL) + OR + 7 OL
Xaz C-290" (L * c-) 8! c) -1 and pOo (FL-ijiR + / 90 '(RL-) * R + 0L-4oi) BJLHm + / 90' ('1 qc-) LIC),
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+ / 9 (1' (FR-) PL- / 90 '(Approx. 8-) l) + 0 roots OL) However, the value of-in each of the above
dilations can be optionally oscillated in the range of IIi of 0 ≦ Δ × l, and the values of the
encoder 11 and the decoder 30 are also The signals PL, PR and RL can take different values.
Each one of four can also take different values. Thus, the decoder 10 can obtain, for example, an
in-phase output and a phase-inverted output as shown in the sixth F11, respectively, with the
phase inverting circuit sr, the sz1 phase circuit II, 14. Ig、1g。 The variable phase azr, zz, zz
and the resistors 16 ° 4J, 47, 4J are respectively used, and as shown in FIG. :, 9, 5. Machi, 3 ′
′ 8-35301 = 1 !, 1 用 い る uses the phase characteristics reverse to the phase characteristics of
the phase circuit 11 ′ ′-15 of the encoder 11. Therefore, in the case of the decoder J0 having
such a configuration, when the signals L □ and R 1 are transmitted first, the signal Lt & is
transmitted to the phase inverting circuit J1. Through the resistor 40 and the phase circuit JJ,
respectively, to the output terminal 44, the second phase inverter circuit 37 is derived. It is
derived as I'l'90'Lea at the output terminal 4M through the resistor 4 and the phase circuit 14
respectively, and the phase inverting circuit 31.I. Variable capital reduction l! It is derived as-(+ /
90 "ΔL snow a) at output terminal 4 # through 13 # and phase circuit S5 respectively, and
phase inversion circuit JJ, resistance 40, 1q variable resistance 32 and phase circuit 3C
respectively It is derived as an L1 m through the output terminal 4 r. Also, the signal R theory is
a phase inversion circuit 32. Resistance 42. Derived from the variable attenuator Jr and the
phase circuit JJ as an output node 44 as a node −, one phase inversion path XZ, a variable
attenuation @Xa and a phase circuit J4 respectively to the output terminal 41 − (− 2QO @)
derived as bird-4B-35301-1615-, and 1 phase inverter circuit 32. The resistor 43 and the phase
circuit J5 are respectively led to the output terminal 4d as +79 (f '' & l), and the phase inverting
circuit 77, the resistor 42 and the phase circuit Jl are respectively led as the. Next, when the
signals L * b # Rib and LfceR * e are transmitted, they are decoded by the same operation as
described above, and the signal FL! Of the channel number is output from the output terminals
44 to 4r. , J'R,. BL □, RR, are obtained. Therefore, the explanation of the operation is omitted.
Thus, the four channel signals FL □ FB, ML, RR, derived from the output terminals 44 to 47 of
the decoder jO, are microphones on NFL in the original sound field l # in the reproduction 堝 se.
It is applied to x Bees hspx, spB, snx and anm, which are respectively arranged in correspondence
with MFR, MAL and MJL 轟 respectively, to perform the stylistic reproduction of the f sound.
As described in detail above, in the case of dysentery, signals of 4 channels consisting of at least
2 forward channels and 3 backward channels at least in front of one another are provided
respectively corresponding to these in a difference mode In addition to the phase circuit
described above, each signal-has a predetermined phase relationship, and these are mixed into a
signal of at least 2 channels by the mixing circuit, and the signals of this 3 channels and the
respective front and rear channel signals are further added. The signal of at least 2f channel
obtained from the approximate center of the signal is mixed and converted into a signal of at
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least 2 channels and transmitted, and this 2+ channel signal is recombined and converted to a
signal of at least 4 channels Therefore, according to this invention, the loss of information in the
pigeon that converts the signal of the ataz channel to the signal of four channels It is possible to
reliably transmit to the backpost at any position in the original sound field, and at the same time
to all the channels at the same time, and at the same time, at least in one direction. In addition to
the six channel signals consisting of channels, at least two left and right channel signals are
obtained from the approximate center of each of the front and rear channels, so separation
between the left and right channels between the front and rear is extremely high. When such a
channel signal is stored in the decoder, the signal localized in the approximate center between
each of the front and rear channels obtained by the encoder can be reproduced as it is. There is
no loss of indirect sound even if it is a blend (mixing) It is possible to obtain a sound field and f11
effect substantially equal. That is, when the signal can not be obtained from the approximate
center between the 11111 side and the rear channel, the respective channels are blended at the
encoder side. The separation between the left and right channels between the front and the back
becomes much narrower than that of the front and rear. When such a channel signal is
reproduced on the decoder side, the signal 21 containing one phase 葺 component Indirect loss
is lost to cause internal loss W, ==: == ;; 7 I child shock j, □ *, ', + j', ('l'-1 !,] 255..70. 1116 g-You
can not get enough of the spread of t, but in this invention, as described in 1 above, I made it
possible to obtain the center channel signal to compensate for the lack of this indirect sound, so
The sound will be localized between the left and right channels in the central part, and the feeling
of the spread of responsibility can be sufficiently given.
Moreover, in the present invention, since the blending between each channel in the encoder can
be performed alternatively by the true pitch, the position of the sound image can be arbitrarily
moved and the localization can be performed. The degree of freedom can be further improved.
That is, in general, each studio's lIl table is equipped with a pan pot (blend adjustment equipment
Wt), which allows the position of the sound image to be moved arbitrarily, but the blending in the
encoder and that of the adjustment car However, the program source may cause inconvenience.
In addition, if the blend in the encoder is Iil, then I l l l l l; -48 "" "35301-20--1? Even if the sound
image is moved arbitrarily as 4 pseudo 意味-□, its meaning is lost, but since selective blending
can be performed as Fi punctuation in this invention, for example, the above mentioned on the
input side of the encoder When there is an electrical or WII-like blending element such as a sin
table, zeroing the blend (that is, the value of-) between each channel by switching the switch
allows arbitrary positioning and localization of the sound image with the external blending
element. Can be moved to Therefore, by selectively performing blending between each channel in
the encoder, a snow tatami effect or presence feeling more equivalent to the jl Ifl field can be
obtained. In the fII example, Mike Mitsuon MOL. The signals OL and OR from the MO wind are
respectively added to the mixing circuit 19.11 through the phase circuit 16.1F, but this is the
phase circuit 1g. Alternatively, they may be added to the mixing circuits zm and xx directly
without passing through the IF. · Also, in the above embodiment, the signal of 4 channels is S?
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″2ネ7. (D, Qf; l, ..., 7 and transmitted again: '--55 :, 4%--,-, 48-353 p 172 151, the case of
converting to a 4-channel signal) However, the present invention is not limited to this, and the
signals of other multiple channels can be similarly converted into the signals of the minority
channel, transmitted, and converted again to the signals of multiple channels.
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