參數(shù)資料
型號(hào)： ZL50232GD
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 數(shù)字傳輸電路
英文描述： DATACOM, ISDN ECHO CANCELLER, PBGA208
封裝： 17 X 17 MM, 1.30 MM HEIGHT, LBGA-208
文件頁數(shù)： 41/41頁
文件大?。?/td> 809K
代理商： ZL50232GD
ZL50232
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 ZL50232
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.
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 estimate or 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
相關(guān)PDF資料
PDF描述
ZL50233/GDG DATACOM, ISDN ECHO CANCELLER, PBGA208
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ZL50232GDC 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:32 Channel Voice Echo Canceller
ZL50232GDG2 制造商:Microsemi Corporation 功能描述: 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 32CH 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 CANCELLER 208LBGA 制造商:Microsemi Corporation 功能描述:IC VOICE ECHO CANCELLER 208LBGA
ZL50232QCC 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:32 Channel Voice Echo Canceller
ZL50232QCC1 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:32 Channel Voice Echo Canceller
ZL50232QCG1 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 32CH G.165/G.168/G.711 W/ TONE DETECTION - Trays 制造商:Microsemi Corporation 功能描述:PB FREE 32 CHANNEL VOICE ECHO CANCELLER
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