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参数资料
| 型号： | CS6422-CS |
| 厂商： | CIRRUS LOGIC INC |
| 元件分类： | 无绳电话/电话 |
| 英文描述： | Enhanced Full-Duplex Speakerphone IC |
| 中文描述： | SPEAKER PHONE CIRCUIT, PDSO20 |
| 封装： | 0.300 INCH, MS-013, SOIC-20 |
| 文件页数： | 36/48页 |
| 文件大小： | 873K |
| 代理商： | CS6422-CS |
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CS6422
36
Any signal greater than 30 dB below full-scale (a),
is scaled down to 30 dB (b). This signal is then
scaled up +30 dB (the reference level) to provide
the final output (c). Note that the combination of at-
tenuation and gain results in less than +30 dB total
gain being applied. If the input signal is below
30 dB below full-scale (d), no attenuation is added
and the full +30 dB of gain is applied to the signal
(e).
When the reference level is set to +0 dB, the AGC
is effectively disabled. Volume control is imple-
mented by digital attenuation in 3 dB steps from
this point on down. The maximum gain is +30 dB,
and the minimum is -12 dB in 3 dB steps. The low-
est gain setting (1111) mutes the signal path. The
signal scaling takes place in between the two can-
cellers, and so does not disturb the echo canceller
as changing gain in the echo path, for example at
the speaker driver, would (see Section 4.1.1.2,
“
Adaptive Filter
”
for more details).
4.1.4
Suppression
Echo cancellation is somewhat of a misnomer in
that echo is merely attenuated, not entirely can-
celled. Some residual echo still exists after the
summing node. This residual echo, though low in
amplitude, may be audible when the near-end talk-
er is not speaking. Suppression further attenuates
the echoed signal, preventing the far-end listener
from hearing echo.
The CS6422 employs supplementary echo suppres-
sion which adds attenuation on top of the cancella-
tion to remove the residual echo. For example, the
CS6422 will engage extra attenuation in the trans-
mit path whenever only the far-end talker is speak-
ing. However, if the near-end talker starts speaking,
this attenuation is removed and the system relies on
the near-end talker
’
s speech to mask the residual
echo.
-30dB
Fs
(a) Input Signal
t
-30dB
Fs
(c) AGC Gain
t
-30dB
Fs
(b) AGC Attenuation
t
-30dB
Fs
(d) Input Signal
t
-30dB
Fs
(e) AGC Gain
t
0dB
0dB
0dB
0dB
0dB
Figure 11. How the AGC works (TVol = +30 dB)
DS295F1
相关PDF资料 |
PDF描述 |
|---|---|
| CS6422-CSZ | Enhanced Full-Duplex Speakerphone IC |
| CS7054 | Low Side PWM FET Controller(高端PWM FET控制器) |
| CS7054YDW16 | DC Motor Controller/Driver |
| CS7054YDWR16 | DC Motor Controller/Driver |
| CS7410 | CD/MP3/WMA Audio Controller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CS6422-CSZ | 功能描述:音频放大器 Enhanced Full-Duplex Speakerphone IC RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| CS6422-CSZ | 制造商:Cirrus Logic 功能描述:ICTelephone Speech CircuitSOP20PINPL |
| CS6422-CSZ | 制造商:Cirrus Logic 功能描述:IC TELEPHONE SPEECH CIRCUIT 20SOP |
| CS6422-CSZ/A | 功能描述:IC SPEAKERPHONE ENHANCED 20SOIC 制造商:cirrus logic inc. 系列:* 零件状态:过期 标准包装:37 |
| CS6422-CSZR | 功能描述:电信集成电路 IC Enhanced Full-Duplx Spkrphone RoHS:否 制造商:STMicroelectronics 类型:Telecom IC - Various 工作电源电压:4.75 V to 5.25 V 电源电流: 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-100 封装:Tray |
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