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JPS5276001

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DESCRIPTION JPS5276001
(4, 0bO (7) + 9 Patent Office Secretary Hideo Saito 4; Agent Clouding 160 [Phase] Japan Patent
Office 0 JP-A 52-76 0010 Published Japanese Patent 52. (1977) 6. 25. Japanese Patent
Application No. JP-A to 24.03. (Application) Title of the Invention 4-channel stereo playback
device With respect to the listening position, the voice generator is disposed at the left front, the
left back, the right front and the right back. 4 channel audio based on level difference localization
and converted to 2 channel audio signal and R to 4 channel audio signal to be supplied to the
above left front, left back, right front and right back audio generators. The signals LP% L13 ° Rp
and RB are respectively LF "aLF'LbIJ" RLB-alB ° LbLB ° RRF "aRF" R-bRF "LRB" aRB'R-bRB "L,
said aLF, aLB, aR11 '," RB, bLF, bLB, by. And bRB, when the sound image is between the left front
and the left back, respectively, RF = O, RB = O, Lp becomes larger as it gets closer to the left front,
and LB becomes larger as it gets closer to the left rear. The sound image is between the right
front and right rear so that LB = O 1 RB = O when between left front and right front, LF が
becomes large as LW approaches and Rp becomes larger as right front approaches. Sometimes
Lp = 0 A four-channel stereo reproducing apparatus characterized in that LB = O, R and p
become large as approaching to the right front and RB becomes large as approaching to the rear
right.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a 4-channel stereo
reproduction apparatus in which 2-channel audio signals based on level difference localization
are converted into 4-channel audio signals and reproduced, and in particular, the sound image
can be well localized. The same is true. In the following, an embodiment of the present invention
4 channel 會 オ オ オ 装置 装置 装置 装置 し な が ら will be described with reference to the
drawings. In FIG. 1, (1) shows a listener who exists in a listening position, and a voice generator
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is disposed in front of this listener (1), left back, right front and right back. In this example, the
speakers (2a), (2b), (2c) and (2c) in the front center CF of the listener (1), in the direction of −45
°, −135 °, 45 ° and 135 ′ respectively. Distribute (2d), and add four output terminals of the
2-channel to 4-channel converter circuit (3) (3LP input (1)) to the EndPage: 1-force (2a), (2b),
(2C) and (2d). 3 LB (3 w) and (3 RB) K are obtained. The left front signal LP, the friend rear signal
LB, the right front signal RF and the right rear signal RBt are respectively supplied. The 2-channel
to 4-channel conversion circuit (3) has two input terminals (3L) and (3R) K shown in FIG. 2 and
the left and right signals of the two chicken speech signals based on the level difference
localization. These four output terminals (31F), (3LB), (3RF) and ((3IIB) K, as shown in FIG. 3K.
The right front signal R1i 'and the right rear signal RB are obtained. In the present invention, the
relationship between the 2-channel audio signal and B and 4-channel audio signal based on this
level difference localization, that is, the left front signal LF, the left rear signal LB, the right front
signal RF and the right rear signal RB. LP = aLF-L-bLF-R (1) LB = aLB-L-bLB-B (2) 顯 = aR11iI-R-b
藺 L ... (3) and, this zero coefficients aI, F, aLB, "RF," RB, 'IJ', bLB. When the sound image is
between the left front and the left back of bRF and bRB, respectively, RF = 0, RB = O, Lp becomes
larger as it approaches the left front, and LB becomes larger as it approaches the left rear. When
the sound image is between left front and right front, LB = 0, RB = O, LP becomes large as it gets
closer to the left front, <-tc so as to make it close to the right front IC and sound image Lp = 0 if
there is VC between right front and right back LB=0. RF is large as it approaches to the
right front, and RB is selected to become large as it approaches to the rear right.
That is, this issue! As shown in FIG. 4, the relationship between the magnitudes of the two equal
coefficients aLF, LB, R1 ′, R8, 緘 bu, by, by and bRB and the front center CF of the sound
image is shown in FIG. It is related. Based on the level difference localization as shown in FIG. 2,
the left front signal LP, the 2E rear signal LB as shown in FIG. 3 and the right front signal Rp and
the right as shown in FIG. A backward signal 'RB can be obtained. The left rc2 channel-4 channel
conversion circuit (3) for obtaining such left front signal L1% master post signal LB, right front
signal, RF and right rear signal RB is configured as shown in FIG. 5, FIG. 6 and FIG. . From the
relationship of the coefficients shown in FIG. 4, aLP = "-bLFaLB" '-bLB "RF ="-bR1i' 喰 B = 1-bRB,
and the coefficients bLF, bLB, bRF and bRBft are respectively given by the following equations
Try to approximate. bR, B-(+ iLI + I (L + R month) .IRI, ie, the coefficients bLF and bLBt 'are
obtained as shown in FIG. A two-channel audio signal based on level difference localization
supplied to input terminals (3L) and (3R), that is, a left signal and a right signal Rt-a rectifier
circuit (7a) that respectively performs voltage control at automatic gain control times * tSa. And
(7b) It is respectively supplied to the input side of the adder circuit (6) through It, and the output
signal of the adder circuit (6) is supplied to the gain control terminals of the voltage controlled
variable gain amplifiers (4) and (5). To make the level of the added value of the left signal and the
right signal obtained at the output side of each of the voltage controlled variable gain amplifiers
(4) and (5) constant. In addition, a left signal Lt shown by a curve (4a) VC shown in FIG. 8A
obtained at the output @ of this voltage controlled variable gain amplifier (4) is an actuator (8)
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for making a pulse 11- To the output side of the attenuator (8), and the left signal i as shown in
FIG. 8A shown by the curve (8a) 4C shown in FIG. 8A to the negative terminal of the subtraction
circuit (9). The right signal R is supplied to this subtraction circuit li! As shown in FIG. 8 curve
(5a) which is supplied and obtained on the output side of the voltage control variable gain
amplifier (5). ! It is supplied to the plastic terminal of (9) and supplied to the output side of this
subtraction circuit (9) to the 8th EndPage: 2 way aD, obtained on the output side of this twowave rectifier circuit I, and a voltage control variable gain amplifier. The output signals (4 turtle)
and (5 sl) of (4) and (5) are respectively supplied to the input lIl of the addition time wr (d), and
the curve of FIG. 1! As shown in It), a signal L + R obtained by adding the left signal and the right
signal R to one is obtained, and the output signal (13a) of the adding circuit 3!
The signal level is set to i. The curve of FIG. 8B obtained on the output side of the double-wave
rectifier circuit αS is supplied to the double-wave rectifier circuit (d) for obtaining its absolute
value signal via the attenuator 4a4. 15a) As shown in FIG. 8 Co curve (12 m) obtained as shown
in FIG. 8 Co curve (12 m) obtained by adding the ll (R + I) signal as shown in FIG. 10 + i (R + L) l
signal is supplied to one input terminal of a multiplier 224 circuit, and the output signal (4 K) of
the voltage controlled variable gain amplifier (4) is double wave rectified to obtain an absolute
value signal It is supplied to the other input terminal of the multiplying circuit μQ through the
circuit aa, and the signal b of the coefficient bLP is given by the signal (7m) as shown by the
curve (16m) in FIG. I3- <n-"=> ++ 1- (R + L) III LI signal is 224 is obtained. a 鵠 bL? It is a signal
output terminal. Also, the output signal (5a) 1 curve (19a) IIC of the voltage control variable gain
amplifier (5) is shown! 1 1 signal addition circuit 1 1 signal. , Kayuko, supply, f, co-op, acalculation, oh. . A double-wave rectifier W & (R) for supplying an R + L signal as shown by a
curve (13a) vc obtained on one side to the other input terminal of the adder circuit and an output
signal of the adder circuit to obtain an absolute value signal. 21), and the + i [+ () L + L) l signal as
shown by the curve (21a) in FIG. 9B obtained on the output side of the double-wave rectifier
circuit (21) Supply to the input terminal, or both wave rectification circuit (1? Signal to the other
input terminal of this multiplication circuit [stock], and the output side of this multiplication
circuit (c), ie, bLB signal output terminal (c) FIG. It may depend on i (8) shown in curve (22a) of B.
That is, (4b) and (8b) are respectively supplied with the output signals (4a) and (5a) of the
voltage control variable gain amplifier (4) and (the group, respectively) at the stone input
terminal. The signal is supplied to the minus terminal of the (d) and the L signal 4m supplied to
the input terminal (4b) is supplied to the plus terminal of the (d) subtraction circuit, and is
obtained at the output side of the subtraction circuit (d). R38 (L-7) signal to signal level 'tT times
through i amplification circuit @ to obtain an absolute value signal, supply to the input side of the
both-wave rectification port W & と, and both-wave rectification The + u and -B month signals
obtained at the output side of the circuit are supplied to one of the two input terminals of the
adding circuit (c), and 'L obtained at each of the input terminals (4b) and (5b) A signal and an n
signal are supplied to one and the other input terminals of the addition time + 1 co respectively.
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The L + R signal obtained by the output 1lIIIC of the addition circuit (2) is supplied to the input
side of a double wave rectification circuit G1 for obtaining an absolute value signal by making
the signal level and an attenuator [phase] un. The 1τ (L + R month signal is supplied to the other
input terminal 2 of the addition time W & (d)) obtained on the output side of the wave
rectification circuit 6D, and obtained on the output side of the addition circuit (d): L-January + 17
(L + present! The signal is supplied to the 2 璽 EndPage of the multiplying circuit (至): to the
three input terminals, and the output side of the multiplying circuit (至), ie, the bRB signal output
terminal (至) as bR and B signals (1 ÷ Ll + l A (L-1-R) l) .IR + signal is obtained. In order to obtain
the left front signal Lp, the 'EE after signal LB, the right front signal RF and the right rear signal
RB using the bLF signal, bLB signal, bRF signal and bRB signal thus obtained, as shown in FIG. It
depends on you. That is, the L signal supplied to the input terminal (3L) is supplied to one input
terminal of the adding circuit 、, and the L signal is input to the voltage controlled variable gain
amplifier Supply to the input side of Q, and also to the control signal supply terminal of this
voltage controlled variable gain amplifier (42) via the bLF signal input terminal (the bLF signal
supplied to 43 is the time constant circuit 04), The voltage controlled variable gain amplifier (one
bLyL signal obtained at the output side of the 4'4 is supplied to the other input terminal of the
adder (40 and the output side of the adder (40 , P) Supply an L signal to one input terminal of
the adder circuit (45). Also, the R signal supplied to the input terminal (3R) is supplied to the
input side of a voltage control variable gain amplifier (47) via an inverter circuit for polarity
inversion (through 襖. The bLli 'signal obtained at the output side of the time constant circuit
(44) is supplied to the control signal supply terminal of the voltage controlled variable gain
amplifier (47), and the voltage controlled variable gain amplifier (47) A circuit (4! This addition
circuit (4! Supplied to the other input terminal of 9) A left front signal LF of (1bLp) LbI, pR = aLpLbLp-R is obtained at the 19 output side, that is, the left front signal output terminal. Also, an L
signal obtained at the input terminal (3L) is supplied to one input terminal of the adder circuit
(41 and the inverter circuit f41), and an L signal voltage control variable gain amplifier (50
Supply the bLB signal supplied to the bLB signal input terminal 6]) through the time constant
circuit to the gain control terminal of the voltage controlled variable gain amplifier (a), and this
voltage controlled variable Gain amplifier (One bLB-L signal obtained at the output side of 5G is
supplied to the input terminal of the addition circuit (the other terminal of four lines, and this
addition circuit is obtained at the output side of 4 坤 (Ib I, B) • Supply the L signal to one input
terminal of the adder circuit (to).
Also, the -R signal obtained on the output side of the inverter circuit section is supplied to the
input side of the voltage controlled variable gain amplifier (2) 54], and the bLB signal obtained
on the output side of the five time constant circuits is This signal is supplied to the gain control
terminal of this voltage controlled variable gain amplifier 64), and one bLB-R signal obtained on
the output side of this voltage controlled variable gain amplifier 54 is supplied to the other input
terminal in the addition circuit. The left rear signal LB of (1-bLB) -LbLB "" "aLB'L-bLB-R is
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obtained at the output side of the addition circuit 5J, that is, at the pressure-removal signal
output terminal (551). Also, the R signal supplied to the input terminal (3R) is supplied to one
input terminal of the adder circuit 66), and the inverter circuit (one R signal obtained on the
output side 1 of the candle is a voltage controlled variable gain amplifier) 57) supply to the input
side and '! The bRF signal supplied to the signal input terminal (5B) is supplied to the gain
control terminal of the voltage control variable gain amplifier r5η through the time constant
circuit 69, and the output side of this voltage control variable gain amplifier 57) The obtained
one bR1i ′ ′ ′ ′ signal is supplied to the other input terminal of the adding circuit (g), and
the (1-bRF) · R signal obtained at the output side of the adding circuit (d) is one of the adding
circuits (60) Supply to the input terminal of. Further, one L signal obtained at the output side of
the inverter circuit ΩB is supplied to the input side of the voltage controlled variable gain
amplifier 611, and the bRP signal obtained at the output side of the time constant circuit member
is this voltage controlled variable gain amplification. One bBp-L signal obtained at the output side
of the voltage controlled variable gain amplifier is supplied to the other input terminal of the
summing circuit, and supplied to the other gain terminal of the summing circuit. A right front
signal RF of (1-bHP "" '-bRF "" = "RF-"-bRF "L is obtained at the output side, that is, the right front
signal output terminal 62. In addition, the input terminal (3 R signals supplied to one input
terminal of the adder circuit (63) is supplied to the input circuit, and the inverter circuit (one R
signal obtained on the output side is supplied to the voltage controlled variable gain amplifier
64), and the bRB signal supplied to the bRB signal input terminal 651 is supplied to the gain
control terminal of the voltage controlled variable gain amplifier (64) through the time constant
circuit 6G), and this voltage control is performed. One bRB-R signal obtained on the output side
of the variable gain amplifier (64) is added, supplied to the other input terminal of the circuit Q,
and obtained on the output side of the addition circuit Q33i (1-bBB) · R Add signal circuit [?
Supply to one of the input terminals of Also, an inverter circuit (L-fold signal voltage control
obtained at the output side of 411: EndPage: 4 variable gain increaser 1) is supplied to the input
side of the unit (good).
Also, the bRB signal obtained on the output side of the time constant circuit can is supplied to the
gain control terminal of this voltage controlled variable gain amplifier, and one bBB-L obtained
on the output side of this voltage controlled variable gain amplifier H A signal is supplied to the
other input terminal of the adder circuit (67), and the output side of the adder circuit (67), that is,
the right rear signal output terminal (1) is (1-bBB) R-bRB-L = aB, B- The right rear signal RB of
RbB and B-L is obtained. As described above, according to the present invention, the audio signal
of two channels based on level difference localization is represented by the audio signal L1 of the
four channels of the relationship as shown in FIG. LB、 RF。 And since it converts to RB,
good four-channel stereo reproduction, that is, sound image can be well done. Further, according
to the present invention, since the audio signal of two channels based on the level difference
localization is directly converted to the audio signal of four channels, there is no need for a
phaser and there is no deterioration of the sound quality due to this phaser. Also, according to
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the 4-channel stereo reproduction equipment according to the present invention, there are good
benefits with the conventional two-channel one as a source. Also, in the above-described
embodiment, although an example in which the sound image is localized over the 270 ° range
in the range of -135 ° to 135 ° has been described, the sound image over the 360 ° range in
the range of -180 ° to 180 ° Can be localized. That is, in this case, a 4-channel audio signal,
that is, a left front signal. The relationship between the signal levels of the pressure drop signal
LB, the front right signal Rp and the rear right signal RB and the direction of the sound image is
as shown in FIG. 1θ. In this case, two channels of audio signals, ie, pressure signals and right
signals R, are obtained as shown in FIG. 11 in the relationship between the signal level and the
direction in which the sound image is to be localized, and these are used as input terminals (3L)
and Convert to (3R) into a relation as shown in the following equation by means of the & fL, 2channel to 4-channel converter (3) respectively. LF = aLF1-L-bLF ′ · RLB == aLB′′LbLB ′ ′
RRp = aRF′′RbBp′′L′′B = CR8′′R−bklB ′ ′ ′ In this formula, the coefficients aLF
′, aLB ′, bLF ′ And the relationship between the magnitude of each of bLB 'and the direction
of the sound image is as shown in FIG. 12, and the coefficients al (, f8.', A .quadrature. 8 ', b
formula' and bR8 ' The relationship between the sound image direction and the sound image
direction is assumed to be symmetrical with respect to 06 in FIG. That is, in the first range of 135
° to 135 °, aLF ′ ′ = aLF ′, aLB ′ = aLB (aRF′′7′aR1 + ′, R8 ′ = aRBbLF ′: bLF,
bLB ′: bLBbRF ′ ′ bRF, bRf3 "" bRB, and in the second range of 135 DEG to 180 DEG, it is
approximated by the following equation.
aLF '= 1-(+-5-R-L. aLB' =-(1-(+-5.R-L1)) aRF1 '' ''-(IR-L1) bH, B '= (liL1 + IR + LI) .IRI In the third
range of -135 ° to -180 °, Q 瑠 is approximated by the following equation. a,:, = 1-4 L 'Lla' = 11
1 LB 2 L b L F = (1 (R-January 1. (R+L)I)・IL+bL′B=(1−!
−R1+lL+TLl)・IL+3B。 B: F '=-11- (L-Janun + 17 (L-1-R Mon 1. IRIb,...: B =-++, L
++ 1n + L +) IRI This first range, second range and third It is obtained as shown in FIG. 13 to
obtain the switching signals CF, CL and CR for switching the range and the signal d = 1-5 R-Lle =
1-R-L1 for obtaining the above-mentioned coefficient. That is, in FIG. 13, (4b) and (5b) can be
obtained at the respective outputs of the 'voltage controlled variable gain amplifier (4) and (5) of
the circuit as shown in FIG. The left α end page as shown in the figure shows the input terminal
to which the 5 signal and the right signal R are supplied, and the L signal and R signal
respectively supplied to the input terminals (4b) and (5b) The (R + L) signal obtained at the
output side of the adder circuit ffl is supplied to one input terminal and the other input terminal,
and is supplied to one input terminal of each of the two multiplier circuits συ and a 4b) and
(Sb) respectively supply the L signal and the R signal respectively supplied to the other input
terminals of the multiplication circuits σ and ffa, respectively, and are obtained at the output
side of the multiplication circuit rIJ) (R + L) .Shutdown circuit f which forms a waveform shaping
circuit for L signal 3 through the signal obtained at the output side of the Schmitt circuit ff rapid
supplies to the first control signal output terminal σ4 via the inverter circuit σ9 supplied to the
second control signal output terminal [sum] Q. In this case, the fifth control signal output
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terminal (a first control signal CR obtained at r41 and a second control signal CR obtained at the
second control signal output terminal .sigma.e are signals whose phases are mutually inverted. A
third control signal output terminal ffgjvc is supplied via a certain oI, and a signal obtained on
the output side of the Schmitt circuit ση is supplied to a fourth control signal output terminal
via an inverter circuit ff1t. In this case, the third control signal output m-r-a * tc * cyh; bti + °
010 and the fourth control signal CL obtained at the control signal output terminal 114
are signals inverted in phase with each other. is there. Further, the signal CB obtained at the
output side of the Schmint circuit σJ is supplied to one input terminal of the AND gate circuit
C15B), and the signal CLf obtained at the output side of the Schmint circuit surface: the other of
the AND gate circuits (15B) The signal CF is supplied to the input terminal and supplied to the
output side of the AND gate circuit (15B) to the fifth control signal output terminal (159).
In this case, C,> o indicates that the first range is large, CB) O indicates that the second range IC
exists, and CI> O indicates the third range f (f Indicates that there is. Further, L (I No. supplied to
the input terminal (4b) is supplied to one input terminal of the multiplication circuit βυ, and the
input terminal valve is supplied to the other input terminal of the multiplication circuit 子, a
child, The multiplication circuit (1 B, -L signal obtained at the output side of 8 信, 5 times the
double width circuit (C) to make the bell t-5 times signal and double wave rectification circuit for
obtaining the absolute value signal tube- The signal is supplied to the d signal output terminal (d)
through the series circuit, and the l-5R-LIOd signal is obtained at the d signal output terminal (c),
Signal level via double-wave rectifier circuit (3) for obtaining one-pair value signal or via bothwave rectifier circuit Q for obtaining L signal tube absolute value signal supplied via input
terminal (4b) K The signal tg is supplied to the signal output terminal 1. Also, the coefficients bxz,
bLB, by and bBBBFc * fifth interval U can be applied to the circuit as shown in FIG. In this
example, in order to obtain the left front signal LF1 left rear signal hB, the right front signal RF
and the right rear signal RB, FIGS. 14 and 15! XI- Obtained as shown in FIGS. In FIG. 14, FIG. 15,
FIG. 916 and FIG. 17, (4b) is an L signal terminal supplied with L signal, C4c) is an -L signal
supplied -L signal terminal, (8b Is the R signal terminal to which the B signal is supplied, (5c) the
rC-R signal is supplied, the -R signal terminal, (18a) the bLF signal terminal to which the bIJ
'signal is supplied, and (23) the bLI3 signal is The bLI3 signal terminal supplied (34a) is the bRF
signal terminal supplied with the bBF signal, (39 turtles) is the bha signal terminal supplied with
the bRB signal, (74aJ is the CB signal terminal supplied with the CB scratch signal 1, 76a): CB,
signal is supplied #i [-signal terminal, (78a) is CL signal terminal supplied with CL scratch signal,
(80m) is CL signal terminal supplied with CL scratch signal supplied,-(85B3IIi, d signal D signal
terminal, which can be supplied (( E signal layer to which 7 signal is supplied, (90m) is f signal
terminal to which f signal is supplied, (93 is g signal terminal to which g signal is supplied,
(1R9m) 'is a CF multiplication signal It is a DC voltage terminal supplied with 1 EndPage: 6 Cp
signal terminal or 10 BFi positive DC voltage. That is, the fourteenth. In the figure, the R signal
obtained at the input terminal (5b) is supplied to the input 1IIjIC of the gate circuit (a), and the
CR signal supplied to the CR1 signal terminal (76a) is sent to the gate circuit W & (a). This signal
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is supplied as a gate signal, and this gate circuit e4) is made conductive when the t-sound image
is in the second range (13 G @-180 °) vcl, and at this time, the R signal is input to one input
terminal of the addition port and path. The R signal supplied to the input terminal (5b) is
supplied to the inverter circuit mK, and the 18 signals obtained on the output side of the inverter
circuit are supplied to the input side of the gate circuit-. The CR signal supplied to 74a) is
supplied as a gate signal to the gate circuit wI penalty, and this gate circuit W & (A) is made
conductive when the sound image is other than the second range i, and the -8 signal is added at
this time The other input end of , The output signal of the summing circuit (e) is supplied to the
input mlIC of the voltage controlled variable gain amplifier 、, and the bLF signal supplied to the
bLF signal terminal (18a) is supplied to the voltage controlled variable gain amplifier end. It
supplies as a control signal to the gain control terminal of.
A signal obtained at the output of the amplifier (98) is supplied to one input terminal of a
summing circuit. Also, the input terminal (4b) K is obtained. CLd signal supplied to the input side
of the gate circuit (9) and to the CL signal terminal (80a). This gate circuit (2) 1 '' '' '-' 0 '! L
′ ′ ′ ′ 15 · C0f−) UjJ * @ t) Conducted when the sound image is in the third range (−135
′ −− 180 ′), and at this time, the L signal is added to the adding circuit (one input of 10 The
L signal supplied to the terminal and supplied to the input terminal (4b) K is supplied to the input
11 of the inverter circuit (io2), and the output N & C of this inverter circuit (102) is obtained. It is
supplied to the input side of the amplifier (103) and supplied to the input side of the e signal t
gate circuit (104) supplied with the e signal terminal (87 @) and supplied to the CL signal
terminal (80a). CL gate signal supplied to the gate circuit (104) as a gate signal, and when the
gate circuit (104) t-sound image is in the third range, it becomes conductive, and at this time the
e signal is added to the adder circuit (10! S) is supplied to one of the input terminals, and the d
signal supplied to the d signal terminal (85a) is supplied to the input side of the gate circuit
(106), and CR and CB supplied to the signal terminal C76m) A signal is supplied to this gate
circuit (104) as a gate signal, and this gate circuit (104) is made conductive when the sound
image is in the second range, and at this time the d signal is applied to the other input terminal of
the adder circuit (105). Supply the signal obtained on the output side of the adder circuit (105)
to one input terminal of the adder circuit (lot), and the bLF signal supplied to the -bLF 'signal
terminal (18a) a gate circuit ( 10B) CF double signal supplied to the input side of the 10B) and
supplied to the CF signal terminal This gate circuit (108) is supplied as a gate signal, and when
the gate circuit (108) ′ ′ 1 sound image is in the first range And then, supplies the bLF signals
this time to the other input terminal of the adder circuit (107). The signal obtained at the output
side of the addition circuit (107) is supplied to the gain control terminal of the voltage control
variable gain amplifier (103), and the output signal of the voltage control variable gain amplifier
(103) is added The output signal of the adder circuit (101) is supplied to the other input terminal
10 of the adder circuit 101, and the adder circuit! The left front signal LP is obtained at the left
front signal output terminal (109) derived from the output side of ω. Also, as shown in FIG. 15,
the rear left signal LB is obtained.
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The L signal obtained at the J1 input terminal (4b) is supplied to the input side of the voltage
controlled variable gain amplifier (110), and the DC voltage transducer B obtained at the DC
voltage terminal B is a gate circuit (ill) CF gated signal supplied to the vccCF signal terminal
(159a), and supplied as this gate circuit (llll JK gate signal, and this gate circuit (11υ is made
conductive when the sound image is in the first range, At this time, the DC voltage element B is
supplied to one input terminal of the adder circuit (112), and the g signal obtained at the 1g
signal terminal (93a) is input to the input side of the gate circuit wII (113). 1cCI, No. 8 terminal
(Boa) I / C obtained CL multiplied signal This gate circuit (113) is supplied as a gate signal, and
this gate circuit (113) is made conductive when the sound image is in the third range. The signal
g is supplied to the other input terminal of the adder circuit (112), and the signal obtained on the
output side of the adder circuit (112) is supplied to one input terminal of the adder circuit (114).
EndPage: 7 CBJ signal supplied to the I / cCR signal terminal C 76 a) when the d signal obtained
to the terminal (85 a) is supplied to the input side of the gate circuit W & (115) as a gate signal
to this gate circuit (115) Supply, and this gate circuit (115) is made conductive when the sound
image is in the second range, at this time the d signal is supplied to the other input terminal of
the addition circuit (114), and the output side of this addition circuit (114) Signal to the gain
control terminal of the all voltage controlled variable gain amplifier (110), and the output signal
of this voltage controlled variable gain amplifier (110) is applied to the two input terminals of the
summing circuit (116) Supply Ru. Also, the bLB signal supplied to the input side of the 1 L signal
't-voltage control variable gain amplifier (117) obtained at the input terminal (4c) (, 117) and
supplied to the bLB signal terminal (zaa) is a gate circuit The signal is supplied to the input side
of (n8) and is a Cp-fold signal supplied by the CF signal terminal (159a) GC supply This gate
circuit (118) is supplied as a gate signal, and this gate circuit (11B) 2 sound image is in the first
range At the same time, the bLB signal is supplied to one input terminal of the addition circuit
(119), and the DC voltage + B'i gate circuit (120,) obtained at the DC voltage terminal 10B CR
signal supplied to CR signal terminal C76a) and supplied as a gate signal to this gate circuit
(120), and this gate circuit (120) is made conductive when the sound image is in the second
range VC, Supply voltage to the other input of the summing circuit (119) and the output signal of
the summing circuit (119) to the gain control terminal of the voltage controlled variable gain
amplifier (117), The output signal of the controlled variable gain amplifier (117) is supplied to
the input terminal of the gate circuit (160) (the original signal obtained at the signal terminal
(78a) is supplied as the gate signal to the gate circuit (160) The gate circuit (160) is turned on
when the sound image is out of the third range, and at this time, the output signal of the voltage
control variable gain amplifier (117) is added 11 m!
The signal is supplied to the other input terminal of r (116), and the output signal of the addition
circuit (116) is supplied to one input terminal of the addition circuit (12 '). Further, when the R
signal supplied to the input terminal (5b) is supplied to the input circuit of the gate circuit (122),
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the CR and signal obtained at the vcCR signal terminal (7'6a) are sent to the gate circuit (122) Vrgate signal , And when the gate circuit (122) ft sound image is in the second range, the R signal is
supplied to one input terminal of the adder circuit (123), and the input terminal (5c) Ic is
obtained. The supplied l-R signal is supplied to the input side of the gate circuit (124,) as a gate
signal to the gate circuit (124). This gate circuit (124) is made conductive when the sound image
is out of the second range, and at this time the -R signal is supplied to the other input terminal of
the addition circuit (x23), and the output signal of this addition circuit (123) The bLB signal
obtained at the 1CbLB signal terminal (23a) iC when supplied to the input side of the voltage
controlled variable gain amplifier (125) is supplied to the gain control terminal of this voltage
controlled variable gain amplifier (125), and this voltage The output signal of the controlled
variable gain amplifier (125) is supplied to the other input terminal of the addition circuit (121),
and the left rear signal output terminal (126) derived from the output side of this 710 calculation
circuit (121) The after signal LBt-is obtained. Also, to obtain the right front signal RFf, as shown
in FIG. The L signal obtained at the input terminal (4b) is supplied to the input side of the gate
circuit (127) and the CI and the signal supplied to the CL signal terminal (80a) are supplied as a
gate signal to the gate circuit (127), The gate circuit (127) is turned on when the sound image is
in the third range, and at this time, an L signal is supplied to one input terminal of the adder
circuit (128) and one supplied to the input terminal (4C) The L signal is supplied to the input side
of the gate circuit (429) and the width signal supplied to the four signal terminal (78a) is
supplied as a gate signal to the gate circuit (129). When it is outside the range of 3, it is turned
on, and at this time, it is supplied to the other input terminal of the −L times signal addition
circuit (128), and the output signal of this addition circuit (128) is voltage controlled variable
gain amplifier (130) Entry of And the bR and F signals obtained at the bRF signal terminal (34a)
are supplied as control signals to the gain control terminal of this voltage controlled variable gain
amplifier (130J, and this voltage controlled variable gain amplifier (130 ) Is supplied to one input
terminal of the adder circuit (131).
Also, the R signal obtained at the input terminal (5b) is supplied to the input side of the gate
circuit (132), and the Cm signal supplied from the CR signal terminal (76a) IIC is supplied as a
gate signal to the gate circuit (132). When the sound image is in the second range, the gate
circuit (132) is turned on, and at this time, the R signal is supplied to one input terminal of the
addition circuit (133), and the input EndPage: 8 terminal (5C) The e signal supplied to the input
side of the -R signal voltage control variable gain amplifier (134) obtained and the e signal
supplied to the e signal terminal (87a) is supplied to the input side of the gate circuit (135). CB,
the signal supplied to the CR signal terminal (76a) is supplied as a gate signal to this gate circuit
(135 J, and this gate circuit <135) is made conductive when the sound image is in the second
range, at this time e Is supplied to one input terminal of the addition low (136), and the d signal
obtained at the d signal terminal (85a) is supplied to the input side of the gate circuit (13υ and
also supplied to the CL signal terminal (80a) CL multiplication signal This gate circuit (137) is
supplied as a gate signal, and this gate circuit (137) is made conductive when the sound image is
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in the third range. At this time, the d signal is supplied to the other input terminal of the adder
circuit (136), and the signal obtained on the output side of the adder circuit (136) is supplied to
one input terminal of the adder circuit (138). The bRF signal obtained at the signal terminal
(34aJ) is supplied to the input terminal of the gate circuit (139) and the CF signal obtained at the
CF signal terminal (159a) is supplied as a gate signal to the gate circuit (139). At this time, the
bRp signal is supplied to the other input terminal of the addition circuit (13B), and the signal
obtained at the output side of the addition port i (13B) is the gain control terminal of the voltage
control variable gain amplifier (134) , And the output signal of this voltage controlled variable
gain amplifier (134) is added to port 12! Right front signal which is supplied to the other input
terminal of + (133) and supplied to the other input @ of the output signal of this addition circuit
(133) (the other input @ of 13υ and derived from the output side of this addition circuit (131)
The right front signal RF is obtained at the output terminal (140). Also, as shown in FIG. 17, the
rear right signal RB is obtained. That is, the R signal obtained at the input terminal (5b) is
supplied to the input side of the voltage controlled variable gain amplifier (14 '). Also, the DC
voltage element B obtained at the DC voltage terminal B is supplied to the input side of the gate
circuit (142) and the CF signal terminal (159a) fc is supplied with the CF multiplication signal
gate signal to this gate frequency (142) Supply as this gate times W!
(When the 14gJt sound image is in the first range, it becomes conductive, and this plus the DC
voltage 10B is supplied to one input terminal of the adder circuit (143), and the t signal obtained
at the f signal terminal (90a) This signal is supplied to the input side of the gate circuit (144) and
a CR signal terminal (76a) IIC-acquired cR multiplied signal is supplied to this gate circuit (144)
as a gate signal, and this gate circuit (144) When it is in the range, it is turned on, and at this
time the f signal is supplied to the other input terminal of the addition circuit (143), and the
signal obtained at the output side of this addition circuit (143) is one input terminal of the
addition circuit (145) And the d signal obtained at the d signal terminal (85a) to the input side of
the gate circuit (146) and the cL multiplied signal obtained at the CL signal terminal (80a). Signal
as the gate signal (146) is made conductive when the sound image is in the third range, and at
this time the d signal is supplied to the other input terminal of the adder circuit (145), and the
adder circuit (145) The signal obtained on the output side of this is supplied as a control signal to
the gain control terminal of the voltage controlled variable gain amplifier (141), and the output
signal of this voltage controlled variable gain amplifier (141) is added to the adding circuit (147)
Supply to one of the input terminals of Also, the bR and B signals supplied to the input side of the
-R signal voltage controlled variable gain amplifier (14B) obtained at the input terminal (5c) and
supplied to the bRB signal terminal (39a) 4C are gate circuits ( Cp multiplied signal supplied to
the input side of 149) and supplied to the CF signal terminal (159a) This gate circuit (149) is
supplied as a gate signal to this gate circuit (149) and the sound image is in the first range At this
time, the bRB signal is supplied to one of the input terminals of the addition port M (150), and
the DC voltage element B obtained from the DC voltage terminal + BK is supplied to the input
side of the gate circuit (151). CL signal obtained at the signal terminal (Boa) This gate circuit
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(supplied as a gate signal to 15 ', this gate circuit (1150 is made conductive when the sound
image is in the third range, DC voltage at this time) B is supplied to the other input terminal of
the adder circuit (150), and the output signal of the adder circuit (150) is supplied as a control
signal to the gain control terminal of the voltage controlled variable gain amplifier (148) The
output signal of the variable gain amplifier (148) is supplied to the input terminal of the gate
circuit W & (161), and the CR signal layer (CR and signal obtained at 74 供給 are supplied as
gate signals to this gate circuit (16 υ When the sound image is out of the second range, this gate
circuit (EndPage: 9 conducts when the sound image is out of the second range, and at this time,
the output signal of the voltage control variable gain amplifier (148) And supplies the output
signal of the addition circuit (147) to one input terminal of the addition circuit (152).
or. The L signal supplied to the input terminal (4b) is supplied to the input side of the gate circuit
(153), and is also supplied as a gate signal to the CL circuit C153 obtained at the CL signal
terminal (80a). When the circuit (153) ft sound image is in the third range, it becomes
conductive, at this time the L signal is supplied to one input terminal of the adder circuit (154),
and one L signal obtained at the input terminal (4c) CL circuit supplied to the input side of the
gate circuit # & (155) and obtained as a CL signal at the CL signal terminal (78a) This gate circuit
(155) is supplied as a gate signal, and this gate circuit (155) When it is out of the range of 3, it
makes it conductive, and at this time the -L signal is supplied to the other input terminal of the
addition circuit (154), and the output signal of this addition circuit (154) is a voltage controlled
variable gain amplifier (15). Voltage controlled variable gain amplification of the voltage
controlled variable gain amplifier (156) by supplying the bR and B signals obtained at the vcbRB
signal terminal (39a) together with the input #j) of the voltage controlled variable gain amplifier
(156) The output signal of the adder (l-) is supplied to the other input terminal of the adder
circuit (152), and the right rear signal RBt- obtained at the right rear signal output terminal (157)
derived from the output side of the adder circuit (152) . It will be readily understood that the
same effects as those of the above-described embodiment can be obtained in such other
embodiments. Also, in this other embodiment, it is advantageous to speak in localizing the sound
image over the 360 ° range of -180 ° to 180 °. Of course, the present invention is not limited
to the above-described embodiment, and various other configurations can be taken without
departing from the scope of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a route diagram showing the basic
configuration of the present invention 4-channel stereo reproduction apparatus, chain, FIG. 2,
FIG. 4, FIG. 4, FIG. 8 and FIG. FIG. 5, FIG. 5, FIG. 6 and FIG. 7 to be used in FIG. 6 are block
diagrams showing the main parts of one embodiment of the 4-channel stereo reproduction
apparatus of the present invention, FIG. FIGS. 12 and 13 are diagrams for explaining the other
embodiments of the present invention, and FIGS. 13, 14, 15 and 16 and 17 are the other
embodiments of the present invention. It is a composition figure showing an important section.
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(1) is a listener, (2a on (2b on (2c) and (2d) is a voice generator respectively, (3) is a 2 channel-4
channel conversion circuit, R and L are 2 channels based on level difference localization) The
voice signal LP is a left front signal, LB is a left rear signal, Rptri right front, and RB is a right rear
signal. Patent applicant Sony Corporation Fig. 1 End Page: 10 Fig. 2 奢 House Fig. 3 Fig. 4 End
Page: 11 Fig. 11 Fig. 12 向 Direct Direction End Page: 13 Warning: Page Discontinuity 6, Other
than the above The inventor of the inventor Kaoh Deq lqfmll Mara Address Kanagawa Prefecture
Tamazaki City Tama district Sukukawa 宿 96 o 4 v *-ya $ 'k) Name 着 一 16 EndPage: 16
Warning: Page Discontinuity
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