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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(yùn)算，低反向泄露，低噪聲穩(wěn)壓二極管 |
| 文件頁數(shù)： | 28/40頁 |
| 文件大?。?/td> | 549K |
| 代理商： | ZL50212GB |
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ZL50212
Data Sheet
28
SEMICMF.019
Figure 16 - The MU Profile
Functional Description of Register Bits
The Exponential Decay registers (Decay Step Number and Decay Step Size) and Flat Delay register allow the LMS
adaptation step-size (MU) to be programmed over the length of the FIR filter. A programmable MU profile allows the
performance of the echo canceller to be optimized for specific applications. For example, if the characteristic of the
echo response is known to have a flat delay of several milliseconds and a roughly exponential decay of the echo
impulse response, then the MU profile can be programmed to approximate this expected impulse response thereby
improving the convergence characteristics of the Adaptive Filter. Note that in the following register descriptions, one
tap is equivalent to 125
μ
s (64ms/512 taps).
FD
7-0
Flat Delay
:
This register defines the flat delay of the MU profile, (i.e., where the MU value is 2
-16
). The
delay is defined as FD
7-0
x 8 taps. For example; If FD
7-0
= 5, then MU=2
-16
for the first 40 taps of the
echo canceller FIR filter. The valid range of FD
7-0
is: 0
≤
FD
7-0
≤
64 in normal mode and 0
≤
FD
7-0
≤
128 in extended-delay mode. The default value of FD
7-0
is zero.
SSC
2-0
Decay Step Size Control
:
This register controls the step size (SS) to be used during the exponential
decay of MU. The decay rate is defined as a decrease of MU by a factor of 2 every SS taps of the FIR
filter, where SS = 4 x2
SSC
2-0
. For example; If SSC
2-0
= 4, then MU is reduced by a factor of 2 every 64
taps of the FIR filter. The default value of SSC
2-0
is 04
hex
.
NS
7-0
Decay Step Number
: This register defines the number of steps to be used for the decay of MU where
each step has a period of SS taps (see SSC
2-0
). The start of the exponential decay is defined as: Filter
Length (512 or 1024) - [Decay Step Number (NS
7-0
) x Step Size (SS)] where SS = 4 x2
SSC
2-0
.
For example; If NS
7-0
=4 and SSC
2-0
=4, then the exponential decay start value is 512 - [NS
7-0
x SS] =
512 - [4 x (4x2
4
)] = 256 taps for a filter length of 512 taps.
Amplitude of MU
Time
Flat Delay (FD
7-0
)
Step Size (SS)
1.0
2
-16
FIR Filter Length (512 or 1024 taps)
Number of Steps (NS
7-0
)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZL50232 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:32 Channel Voice Echo Canceller |
| ZL50232/GDC | 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 32CH G.164/G.165/G.168/G.711 W/ TONE DET - Trays |
| ZL50232/QCC | 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 32CH G.164/G.165/G.168/G.711 W/ TONE DET - Trays |
| 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 |
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