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參數(shù)資料
| 型號： | ZL50212GB |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| 中文描述： | 250 的低電流運算，低反向泄露，低噪聲穩(wěn)壓二極管 |
| 文件頁數(shù)： | 10/40頁 |
| 文件大小： | 549K |
| 代理商： | ZL50212GB |
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ZL50212
Data Sheet
10
SEMICMF.019
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. The differences between the Advanced NLP and the original NLP are summarized in
Table 1.
The NLPSel bit in Control Register 3 selects which NLP is used. A “1” will select the Advanced NLP, “0” selects the
original NLP.
The Advanced NLP uses a new noise ramping scheme to quickly and more accurately estimate the background
noise level. The noise ramping method of the original NLP can also be used. The InjCtrl bit in Control Register 3
selects the ramping scheme.
The NLInc sub-register in Noise Control is used to set the ramping speed. When InjCtrl = 1 (such as with the
Advanced NLP), a lower value will give faster ramping. When InjCtrl = 0 (such as with the original NLP), a higher
value will give faster ramping. NLInc is a 4-bit value, so only values from 0 to F(hex) are valid.
The Noise Scaling register can be used to adjust the relative volume of the comfort noise. Lowering this value will
scale the injected noise level down, conversely, raising the value will scale the comfort noise up. Due to differences
in the noise estimator operation, the Advanced NLP requires a different scaling value than the original NLP.
IMPORTANT NOTE: NLInc and the Noise Scaling register have been pre-programmed with G.168 compliant
values. Changing these values may result in undesirable comfort noise performance!
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
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