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参数资料
| 型号： | ZL50233/GDG |
| 厂商： | ZARLINK SEMICONDUCTOR INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | DATACOM, ISDN ECHO CANCELLER, PBGA208 |
| 封装： | 17 X 17 MM, 1.30 MM HEIGHT, MO-192, LBGA-208 |
| 文件页数： | 38/38页 |
| 文件大小： | 547K |
| 代理商： | ZL50233/GDG |
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ZL50233
Data Sheet
9
Zarlink Semiconductor Inc.
1.4
Non-Linear Processor (NLP)
After echo cancellation, there is always a small amount of residual echo which may still be audible. The ZL50233
uses Zarlink’s patented Advanced NLP to remove residual echo signals which have a level lower than the
Adaptive Suppression Threshold (TSUP in G.168). This threshold depends upon the level of the Rin (Lrin)
reference signal as well as the programmed value of the Non-Linear Processor Threshold register (NLPTHR).
TSUP can be calculated by the following equation:
TSUP = Lrin + 20log10(NLPTHR)
where NLPTHR is the Non-Linear Processor Threshold register value and Lrin is the relative power level expressed
in dBm0. The NLPTHR register is 16 bits wide. The register value in hexadecimal can be calculated with the
following equation:
NLPTHR(hex) = hex(NLPTHR(dec) * 32768)
where 0 < NLPTHR(dec) < 1
When the level of residual error signal falls below TSUP, the NLP is activated further attenuating the residual signal
by an additional 30 dB. To prevent a perceived decrease in background noise due to the activation of the NLP, a
spectrally-shaped comfort noise, equivalent in power level to the background noise, is injected. This keeps the
perceived noise level constant. Consequently, the user does not hear the activation and de-activation of the NLP.
The NLP processor can be disabled by setting the NLPDis bit to “1” in Control Register 2.
The comfort noise injector can be disabled by setting the INJDis bit to “1” in Control Register 1. It should be noted
that the NLPTHR is valid and the comfort noise injection is active only when the NLP is enabled.
The patented Advanced NLP provides a number of new and improved features over the original NLP found in
previous generation devices. Differences between the Advanced NLP and the original NLP are summarized in
The NLPSel bit in Control Register 3 selects which NLP is used. A “1” will select the Advanced NLP, “0” selects the
original NLP. (See page 24 for Control Register 3 bit description)
Feature
Register or Bit(s)
Advanced
NLP Default
Value
Original NLP
Default Value
NLP Selection
NLPSel (Control Register 3)
1
0 (feature
not supported)
Reject uncanceled echo as noise
NLRun1 (Control Register 3)
1
0 (feature
not supported)
Reject double-talk as noise
NLRun2 (Control Register 3)
1
0 (feature
not supported)
Noise level estimator ramping scheme
InjCtrl (Control Register 3)
1
0 (feature
not supported)
Noise level ramping rate
NLInc (Noise Control)
5(hex)
C(hex)
Noise level scaling
Noise Scaling
16(hex)
74(hex)
Table 1 - Comparison of NLP Types
相关PDF资料 |
PDF描述 |
|---|---|
| ZL50408GDC | DATACOM, LAN SWITCHING CIRCUIT, PBGA208 |
| ZL50408GDG2 | DATACOM, LAN SWITCHING CIRCUIT, PBGA208 |
| ZL50418GKG2 | DATACOM, LAN SWITCHING CIRCUIT, PBGA553 |
| ZL50418/GKC | DATACOM, LAN SWITCHING CIRCUIT, PBGA553 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL50233QC | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:4 Channel Voice Echo Cancellor |
| ZL50233QCC | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:4 Channel Voice Echo Cancellor |
| ZL50233QCG1 | 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 4-CH G.165/G.168/G.711 W/ TONE DETECTION - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC VOICE ECHO CANCEL 4CH 100LQFP 制造商:Microsemi Corporation 功能描述:IC VOICE ECHO CANCEL 4CH 100LQFP |
| ZL50234 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:8 Channel Voice Echo Canceller |
| ZL50234/GDC | 制造商:Microsemi Corporation 功能描述:ECHO Canceller Chip 8-CH G.164/G.165/G.168/G.711 With Tone Detection 208-Pin LBGA Tray 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 8CH G.164/G.165/G.168/G.711 W/ TONE DETE - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC VOICE ECHO CANCEL 8CH 208LBGA 制造商:Microsemi Corporation 功能描述:IC VOICE ECHO CANCEL 8CH 208LBGA |
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