參數(shù)資料
型號(hào)： SSM-2122
廠商： Analog Devices, Inc.
英文描述： Dynamic Range Processors/Dual VCA
中文描述： 動(dòng)態(tài)范圍處理器/雙殼抗原
文件頁(yè)數(shù)： 6/12頁(yè)
文件大?。?/td> 371K
代理商： SSM-2122
SSM2120/SSM2122
REV. C
–6–
In the noise gate, downward expander and compressor/limiter
applications, this potentiometer will establish the onset of the
control action. The sensitivity of the control action depends on
the value of R
T
.
For a positive unipolar control output add two diodes as shown
in Figure 7a. This is useful in compressor/limiter applications.
Figure 7b shows a typical response.
Bipolar control outputs can be realized by adding a resistor from
the op amp output to V+. This is useful in compandor circuits
as shown in Figure 8a, with its response in Figure 8b. The value
of the resistor R
PV
will determine the maximum output from the
control amplifier.
STEREO COMPRESSOR/LIMITER
The two control circuits of Figures 6 and 7 can be used in
conjunction to produce composite control voltages. Figures 9a
and 9b show this type of circuit and transfer function for a
stereo compressor/limiter which also acts as a downward
expander for noise gating. The output noise in the absence of a
V
IN
– dB
V
O
–
*
EXPANSION
THRESHOLD
COMPRESSION
THRESHOLD
200
MONO
OR R
L
+V
C
FIGURE 6
200
FIGURE 7
THRESHOLD EXP.
THRESHOLD COM.
–V
C
a. Control Circuit b. Input/Output Curve
Figure 9. Control Circuit for Stereo Compressor/Limiter with Noise Gating and Input/Output Curve
V
IN
– dB
+
–
*UPPER LIMIT CAN BE FIXED BY
VALUE OF PULL UP RESISTOR (R
PV
)
CONNECTED TO POSITIVE SUPPLY
THRESHOLD
V
C
*
2V
|I
IN
|
V+
V+
CON
OUT
REC IN
39k
200
R
CON
TO –V
C
R
IN
MONO
OR R
C
AV
R
T
THRESHOLD
CONTROL
LOG AV
R
IN
L
MONO – R
IN
= 10k
STEREO – R
IN
= 20k
V–
1.5M
1k
V–
V
T
THRESH
R
PV
a. Control Circuit b. Typical Compressor/Limiter Control
Curve
Figure 7. Compressor/Limiter Control Circuit and Typical Response
*UPPER AND
LOWER LIMITS CAN
BE ESTABLISHED BY
VALUES OF R
AND
R
LL
, RESPECTIVELY
V
IN
– dB
+
–
V
C
V
T
<
0
V
T
>
0
*
*
V
T
=
0
2V
|I
IN
|
V+
V+
CON
OUT
REC
IN
39k
200
TO +V
C
OR –V
C
R
IN
MONO
OR R
C
AV
R
T
GAIN
LOG AV
R
IN
L
MONO – R
IN
= 10k
STEREO – R
IN
= 20k
V–
1.5M
1k
V–
V
T
THRESH
R
PV
R
LL
V–
a. Control Circuit b. Typical Compandor Control Curves
Figure 8. Compandor Control Circuit and Typical Curves
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