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参数资料
| 型号： | SSM2120 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | Dynamic Range Processors/Dual VCA |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDIP22 |
| 封装： | PLASTIC, DIP-22 |
| 文件页数： | 8/12页 |
| 文件大小： | 371K |
| 代理商： | SSM2120 |
SSM2120/SSM2122
REV. C
–8–
DYNAMIC FILTER
Figure 12 shows a control circuit for a dynamic filter capable of
single ended (nonencode/decode) noise reduction. Such circuits
usually suffer from a loss of high frequency content at low signal
levels because their control circuits detect the absolute amount
of highs present in the signal. This circuit, however, measures
wideband level as well as high frequency band level to produce
a composite control signal combined in a 1:2 ratio respectively.
The upper detector senses wideband signals with a cutoff of
20 Hz while the lower detector has a 5 kHz cutoff to sense only
high frequency band signals. This approach allows very good
noise masking with a minimum loss of “highs” when the signal
level goes below the threshold.
V+
LOG AV
2
V–
AUDIO
INPUT
AUDIO
OUTPUT
160k
2.2μF
|I
IN
|
10k
REC
IN
39k
1.5M
1k
SIG
OUT
3.3μF
+V
C
–V
C
2200pF
47
36k
36k
100pF
12k
CON
OUT
V–
200
200
9
THRESHOLD
CONTROL
THRESH
3
160k
39k
1k
CON
OUT
V–
THRESH
14
V+
LOG AV
13
3300pF
|I
IN
|
10k
REC
IN
1.5M
3.3μF
15
F
= 5kHz
(HIGH FREQUENCY)
F
≤
20Hz
(WIDEBAND)
36k
5
7
SIG
IN
8
5.6k
5
36k
12
1
V–
V–
Figure 12. Dynamic Noise Filter Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| SSM2122 | Dynamic Range Processors/Dual VCA |
| SSM-2134 | LOW NOISE AUDIO OPERATIONAL AMPLIFIER |
| SSM2134 | LOW NOISE AUDIO OPERATIONAL AMPLIFIER |
| SSM-2404 | Quad Audio Switch |
| SSM2404 | Quad Audio Switch |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SSM-2120 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dynamic Range Processors/Dual VCA |
| SSM2120P | 制造商:Analog Devices 功能描述:DUAL VOLT ATTENUATOR 2120 DIP22 |
| SSM2122 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dynamic Range Processors/Dual VCA |
| SSM-2122 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dynamic Range Processors/Dual VCA |
| SSM2122P | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Amplifier. Other |
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