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4. Agent 讐 160 Address Nishi-Shinjuku 1-chome, No. 1 8-1 Shinjuku (Tsuku and 1 Building)
Tokyo (03) 3 = 念 3-5821 (Representative) [Phase] Japan Patent Office ■ JPA 48-1282010
published Japanese Japanese 48. (1973) 4.14 ■ Japanese Patent Application No. 41112 / ρI ■
Application Date #, (197 /) and / or Request for Examination, (all six pages) Office internal serial
number (0 Japanese category / 71723 Δ> 243 □ specification Control Circuits for Audio Signals
Two types of audio signals are taken out through separate amplifiers whose gain is controlled by
the respective gain control signals of each of the two types, from one of the amplifiers When gain
of the other amplifier is not obtained in the middle of a section where one audio signal is not
obtained, the gain of the one amplifier is gradually raised with a predetermined time constant
The control circuit of the nine audio signals made.
Scope of claim request
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit of
an audio signal to be used, which is a 4-channel stereo reuse demodulation circuit iI $ 罠. For
example, the left front of the listener (1), as shown in Fig.1. Speaker α ·% (2101%-,-placed at the
left rear, right rear, right front respectively, in the speaker position in the 勢 speaker 顛 ˜-? 9
layers of listeners (stereo Ill corresponding to the left front, left rear, right rear, right front
position of 11) Lt-Lm-f Ib, "f body-4 channel nelney methyleo regeneration There is a way to In
this case, such a four-channel stereo signal is converted into a two-channel signal once,
transmitted through broadcasting or a record, etc., and demodulated into a four-channel stereo
signal with a string to obtain four-channel stereo re-dF '. The way to do it is considered. Figures
2-9 show an example of this method. Fang-2 is a 4-channel stereo stop signal supplied to a phase
shift circuit Q11 having a 2 channel postage quantity to obtain a 9 signal and a signal. A
mourning thing is added by calculating al and a signal (ELb-road 4)! S-phase looping with an
affiliation -EndPage: 1yr'ir in 10- shows only phase lag gold. Therefore, as shown in Fig. 3, the
signal Lb is 1 or 3 dB lower than the signal L1 of the reference phase as shown in FIG. It becomes
one synthesized in the state, and the @ defeat mark-SR · t of B2 is in the same phase state of the
haiku Lb at the level of 3 dB more than this with respect to the signal uf of the reference phase
as shown in FIG. Rb or Rb is synthesized with the phase delayed. Fig. 5 shows a demodulation
circuit, which is a phase-shift 1-1 path (12+ and a phase shift circuit (a phase-shift circuit (221
Phase shift circuit c3z] having a # power pair and a phase shift circuit (44 that supplies a phase
shift circuit with a phase shift circuit 444 with a power of 0 and a phase shift circuit of 0 to 21).
Phase shift circuit '+' !, 'mnr' n 482'- 201 (2) from this, third distortion signal 84) 'Wt (4, from
demodulation circuit (6) A reverse shoulder signal Rf 'is obtained. Accordingly, as shown in FIG.
6, the demodulated signal Lf1 of the fang 1 is advanced by the signal Lb ′ ′ at a level 3 dB
lower than the signal Lf ′ ′ of the reference phase, respectively, and the signal 11jbl is in
antiphase Thus, as shown in FIG. 7, the signal 4b Lb ′ of 412 is 2 (3) (iI ′) lower than the
signal Lb ′ ′ of the reference phase as shown in FIG. And the signal Lj ′ ′ is delayed in phase
and synthesized in a state, and the third 珈 餉 signal 1bl is π to the signal Rb ′ ′ of the
reference phase as shown in FIG. The signal Rf @ at a level 3 CIH lower than this respectively--the
phase is advanced 71.
And the signal Lf ′ ′ is synthesized in the reverse phase, and the demodulated signal g, tl of the
iK tree 4 is each 3 dB lower than the reference phase signal ftf ′ as shown in FIG. Signal Lb ′
′ is in the same π phase and (′ ′ !! 11. b "is delayed in phase by-and is synthesized in the
state. That is, each of the demodulated signals 、, f ', Lb', Rj 'and EC (' is composed of the main
component corresponding to the channel and the leakage from the other two channels (4) 1.,
respectively. Therefore, 憤 憤 Lf ', Lb', F (b's, EL ('the husband JF radio (Ill, (201 (3 i (n You can do
noble tI-purple. ((= 1) signal L (', LbI, Rt,', Hlt + is amplifier 0.5) to (46 / 1.1), respectively. Then,
the first @ drinking g ++ 4 + jl, t is a sum 4]-1 path absorption, the phase shift operation is
performed by the master, the phase shift operation is performed on the composite signal at of tand t2 by the phase shift circuit 04 axis? Through the first to the 11th (4 control amplifiers 61
and 6), respectively, to the output pipe discrimination control circuit from 11 and 6z to the
circuit ('+ The difference between the magnitudes of the principal components in the left and
right front azimuth tm forming a pair, and the major components at the rear positions of the
pairing and right and left! It detects which of the differences is larger and exposes the detection
output, and the circuit 631 changes in opposite directions from the circuit 631. The intrusion
control signal of the flag 1 and the fan 2-II! t-gain, the first gain control signal is the time
constant circuit F) 41? : 1) Demodulated signals Lb ° and t corresponding to the left and right
rear positions are supplied to the 'f amplifiers (c) and (c) to amplify the gain sound and to control
its gain sound, The gain control l signal of 2 is amplified by π p + stop L l ′ ′ and o, rl
corresponding to the front position on the left and right through the π number circuit (551t −?
Amplifier (13 and α3 to control its gain, and the larger difference in magnitude between the
main components at the left and right positions makes the pair of demodulated signals I, f ', Hf'
or Lbl, bl1 We will make a strong sense of jealousy and bring out a sense of reality. A π v O
amplifier 61 J and a cedar composite signal of O l are obtained with a phase shift of ψ 10-, 8 'l f f
1 of bite 2 from + J II rl j device 6 z! No. town only n phases (also things are better. The phase
relationship between each component of the signal Lt1 from the amplifier 61] and each fraction
of the signals rt and tI from the amplifier 62 is as shown in FIG. 110 and FIG.
Therefore, the signals Lt 'and R1 1 are rectified by the rectifier circuit wheel and 6η, and the
output of the subtractor (the output of the subtractor circuit 581 is subtracted from the output of
the subtractor circuit E171). If wave rectification is carried out, the signal Lb is included in 11
defects of the same magnitude and in phase, and the signal Rb is included in the same magnitude
and opposite phase @ 4 plus in the signals Lt + and 顯 ゞ, but all (a) Since the leveling outputs are
completely equal to each other, they are canceled in the subtractor, and the result is less than
that of the subtractor (end) EndPage: 2]-. The full wave rectified output of the signal Lf minus the
full wave rectified output of the signal Rf is obtained. Therefore, an output of the difference of
the magnitude of the main component in the signals L5 'and R, 1' is obtained after corresponding
to the front position on the left and right as represented by the circuit (in FIG. On the other hand,
at the adder second J, the haiku Lt1 and) 1.). The addition output of tI is determined, this is
rectified and full-wave rectified by circuit 11 + 11 K ·, and the subtraction output of the signals
LtI and R1 ′ is determined in the subtractor i21, and the reduction output is further added I!
Full-wave rectification is performed in the Ura circuit b). As is apparent from Fig.12 and Fig.13,
the addition output Li '+ Ri' from the added IL unit 6 and the subtraction output from the
destruction unit 、 indicate that the signal Lf has the same magnitude and in phase with IR11.
And the signal Flf is included in a relationship of one square magnitude and in reverse phase, but
since the full wave rectification outputs of two screams become completely equal to one another,
they are canceled in the subtractor and the subtractor 141 As a result, a full-wave rectified
output of the signal Lb is finally obtained by subtracting the full-wave rectified output of 's%.
Therefore, as compared with the circuit part, the demodulation 41 Lbl and-41 Lbl that
correspond to the left and right rear positions as represented by 'I', 1y :::, 1 :; 2-; -2 '-201r3) 11
Lbl-IRbll The output of the difference in magnitude of the main component in 1 is obtained. Then,
in the subtractor, the output of the circuit (from the output of 5 Q) is subtracted from the output
of the circuit 1 35 to obtain 1 1 L fl -1 1 rl [-11 L bl 1 R b 11 subtracted output 1 L. In the same
manner as described above for the time constant circuit (supplied to amplifier Q3 and 儲 through
54I, and the output of circuit section 5) in the reduction unit I / I. w Number circuit 65) All
through the amplifier (+31 and θ, supply threat). Then, for example, the 11th gain control signal
of the flag 1 from 鋺 舅 ω ω becomes thicker and the I j gain signal of the fang 2 from the
reduction X unit 60 becomes smaller rr I day amplifier And gain of the amplifiers α 31 and 04
become large, and conversely, the yF 11 gain control of the 1 from the subtractor + bb +
becomes smaller and the difference from the subtractor red r + The gain of amplifiers 031 and
C331 increases as the gain of amplifier 1 increases, and the gain of amplifiers (13 'and (iii)
decreases. Benefits of 1 to 143!
1) As described above, the difference between the magnitudes of the main components at the left
and right positions is large. In this case, in the automatic gain control circuit, the full-wave
rectified output from the rectifier circuit (G) 6η6 υ and-[add and add the amplifiers according
to the added output 9 n and 52! To control the signals Lt + and Rll from the amplifier amplifiers
eill and 153 to be always at one level. By the way, in the above case, the amplifier 増 and the
state of gain control 41 s at (131 峙 become as shown in FIG. That is, as shown in FIG. 6A, the
output from the circuit-becomes larger than the output from the circuit section in the interval
from tl to 11 and the subtractor-the gain control signal from the subtractor 1 or from the
subtractor When it becomes larger than the gain control signal of Constituent II, the gains of
11llc and 11al shown in B become, for example, +3 dBK, and in the case shown in FIG. The
output of the circuit unit in the interval between 1.1 and 1.1 is smaller as the time constant
gradually decreases, and then the output of the circuit unit becomes smaller than the output
from the circuit unit, as shown in FIG. ! Jo 21 t) The gain control signal is smaller than the gain
control signal of the day of reduction. As shown in the same figure B, the amplifier α3 and the
tree 14 of I gradually become smaller with a fixed time constant from the previous state, and as
shown in the same figure C, the amplifier (2 and [having] The gain of Q rapidly rises to +3 dB,
and thereafter the eleventh gain changes in the same condition. And the section up to tl 、 t, 鴨 t!
To the section from t4 to tI, the section from t to t, the section from t to t, the section from t to t,
the section from t, o in the section at the left and right in front of the seal in the section at o FL
('is a state in which only the recovery lil # Lb's 鴎 1 corresponding to the left and right rear
positions where pairs form' t ', the interval from t, 1.1, the interval at t, t tI オIn the section after t
and t, the output of the circuit section and the output of the circuit section happens to have a
certain size but the same content but the difference becomes zero and the demodulated signal Lf
', R, f It becomes m that can be obtained together with 'and' demodulated signal Lb '% round
shape, but because there is no signal from 戚, it is not possible to obtain demodulated haiku tJ +,
af' and demodulated signal Lb , Rb 'in # i11 However, since it is the case, the point-of time t
and t2. In this case, the amplifier EndPage: 3 葎 1 Pade (13f 43 ム ハ ハ 利得 利得 利得 利得 利得
か ら か ら か ら か ら か ら 上昇 上昇 上昇 上昇 上昇 上昇 上昇 上昇 上昇 上昇 上昇 上昇 上昇 上
昇 こ の こ の こ の) The gain of the amplifier corresponding to the newly obtained paired I l l i
signal is obtained from the state in which only one of Lb ', H and b' is obtained and the other is
obtained. There is no inter-view as it only grows rapidly, but at the time of the figure @, 'll and
[It is not preferable that the gain of the amplifier (L to @ 3 or (C)) rises sharply at OdB1 from the
state of extremely small gain until then. That is, the section from above Kt to t4, the section from
tll to t, and the section after t are iI! Signals Lf 'and FLf' and the demodulation signal 1. bl, or 1b
'can be obtained together or can not be locked together, but in the case of the outpost, time point
1. . 1. And t, the distortion signal L [, ', FLf' and the demodulation signal Lb ', and when it is in a
state where both b' can be obtained, an amplifier corresponding to the demodulation signal
which was not obtained in 1 now (For 131 old or Q, f (1 bar should be restored to OdB
immediately as shown in the figure or it is practically restored like this! It is extremely
regrettable that the 1141j T, f ", Hf" and the revs gs Lb ', Rb', etc. are in the state of being left at
night, like the latter in #I and the latter 1i 44 "wIL (',) Tf' recovery 1 t NFIMLb ', Rb' It is a case
where it becomes impossible to obtain both. Then, at the time point @, tI and t, both of the
recovery signals L ( t, t, l and both of the demodulated image Lb j (bl J, j j 巾 0 嗅 or 閃
corresponding to the 10,000 v 4 signal that has not been obtained when it is no longer possible.
ll! If only one of the signals t, l, H, 1 and the rim signal Lb'Hb 'is obtained, 1! ! It is also
conceivable to make the 11th gain falling edge in the range corresponding to the other
demodulation signal 謙 戚 I 謙 戚 # Q 31 + 331 K so that the minimum value of the gain does not
become so low, but in this way My sense of potential is reduced. The present invention is
intended to eliminate such a defect, and the above-mentioned four channel stereo reproduction
example will be described in the case where one spreader t13 + 1 is one of the demodulated
signals Lf 'and Rf'. Alternatively, in the middle of the section where Lb , R, and 'are not glued,
the amplifier of the method +131 (+43) (the other restored i11 signal LbI, RoI 戚 uLf , 1%
( 43 If it is not obtained, the above-mentioned one amplifier (the first of 131 (46 or @ (9); the
gain is a rest gradually rising with a predetermined time constant). In the following, one example
of the non-invention circuit, and in the case of four-channel stereo h raw, let us describe 1 g of
FIG. Fang 15 fl + 7 j-11 When the hall and the Teiji 9 and for standing child?
Twice w! (In the case where a control end of rise is provided between 54i and 6N, this control
circuit is composed of a time constant circuit and a 囮, a differential amplifier σ υ and a S, and a
rectifier circuit 6! The 11 outputs 11Lrl-IF (, rll 會 differential amplifier συ's positive @ 1 input
terminal (718) are supplied through the time constant circuit 1 and the negative It! Of the
differential amplifier C4. Supply to the input end (72b), father! ! Flow circuit-Output 11Lbl-1Rbllt
differential amplifier ff4 positive side input terminal (72 is supplied through a cascade circuit ■
and negative terminal of differential amplifier (2) a: 1 ( 71 b) supplies that t. Then, the output of
the differential amplifier συ [eg, as a gain control signal of the pole 1, the time constant circuit
64) t-through the amplification good factor and the pole is supplied, and the output sound of the
differential amplifier 6 例 is a pole As the gain control signal of 2 through the time constant
circuit (1) 1 through the amplifier (13 and μ (in the case described above and l1rJ like eg gain
control signal in the opposite direction to the amplifier c! 31c13 and (13113 gain sound control
is performed. If this is done, as shown in Figure 16, t to t. Interval with 壕, from t, interval with s,
s'4 to t. In the section from t to t, the section on 、 and the section from t to t, the amplifiers (L
turbid (C) and c! The state of change of the gain @ at 3 @ is similar to that described above. On
the other hand, for example, in the interval from t to 1.1, as shown in the same AK, the output
from the circuit becomes smaller at time t, so that the capacitor of the time constant circuit is
charged at time t. Charge is gradually discharged with a predetermined time constant noise, so
that the input terminal to the positive @ 1 input end (72 m) of differential amplifier n is gradually
Since the input terminal supplied to the negative input terminal (72b) EndPage: 4 of the ranger
ffz does not change, it is eventually supplied from the differential amplifier (from the array 721
to the amplifier (131 and the crucible). The gain control signal 3112 gradually decreases in this
section To'j VC. Therefore, in this section from t to t4, the curve portion in the same figure B
(amplifier 0: () and (4 islands as shown by 7 濠It seems to rise to In the interval from t to t, on the
contrary to the above, the gain control signal of tree 1 supplied to differential amplifier シ system
amplifier (増) and 關 by the function of time constant circuit I] As the curve portion of FIG. C
((74) shown in FIG. After a few sounds, you will gradually rise.
As described above, according to the circuit of the present invention, one amplifier 0I or # 'ic: one
demodulation signal L (', E (, i '戚 is the other in the interval where LblRbl can not be obtained)
from one amplifier Amplifier O (G) 復 調 is a demodulation of the way of residence from Sumi 漕 3. Voice B Li, B, b1 戚 Lf ', R [' can not be obtained. 131t4.31 * (The gain of 231 □□□ was made
to rise gradually and gradually with 1 time constant sound at some places without rising
suddenly, so there is no unnatural feeling, there is no jump of the sound There is nothing to
happen. Therefore, when any one of the following Th signal If ", R1 and the demodulated signal
Lb ', 84)' is obtained, either jL or g) is obtained. c) be a value 11 obtained falling t 慈峻 in Q
increases or foot position sense because it is possible to minimize 4at- as low as possible of the
gain, natural audibility is obtained. Face The above-mentioned example is the case of 4-channel
stereo reproduction, or until the present invention # 4 is not limited to the case of 4-channel
stereo reproduction.
Brief Description of the Drawings Fang 1 is a four-channel stereo reset [a plan view of an
example of 8; a 2 is a system diagram of a circuit for converting a 4-channel stereo signal into a
2-channel signal; Is a vector diagram of the explanation, Fang 5 is a system diagram of the
demodulation circuit, 1 and 6 to 13 is a rounding vector diagram of the explanation, Fang 14 is a
curve diagram of the explanation, and FIG. 15 is FIG. 16 is a system diagram of an example of the
circuit of the present invention, and FIG. 16 is a curve diagram for explanation thereof. α2 to ha
are phase shift circuits, (6) and (7) are arithmetic circuits, α 謙 to (151 (ha) is an amplifier, @ 67)
iυ6 is a full wave rectification (b) path, − ) Is an adder, f; 21all) 14) is a subtractor, 6196 樟 σ
0) is a time constant circuit. and a'aFi differential amplifiers. Patent Applicants, Inc., Inc. 61 FIG. 1
FIG. 2 FIG. 3 FIG. 3 D-end Page: 511 Open 48-20201 (6 End Page: 6
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