參數(shù)資料
型號： ZL38002QDG
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 數(shù)字傳輸電路
英文描述： Low-Voltage Acoustic Echo Canceller With Noise Reduction
中文描述： DATACOM, ISDN ECHO CANCELLER, PQFP48
封裝： 7 X 7 MM, 1 MM HEIGHT, MS-026ABC, TQFP-48
文件頁數(shù)： 31/47頁
文件大?。?/td> 440K
代理商： ZL38002QDG
ZL38002
Data Sheet
31
Zarlink Semiconductor Inc.
Register Table 17 - Decay Step Number Register (DSNR)
Bit
Name
Description
7-0
NS7-NS0
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
).
Read/Write Page 0, Address: 27
H
Reset Value: 06
H
7
6
5
4
3
2
1
0
NS7
NS6
NS5
NS4
NS3
NS2
NS1
NS0
Amplitude of MU
Time
Step Size (SS)
1.0
2
-16
FIR Filter Length (896 taps)
Number of Steps (NS
7-0
)
The Exponential Decay registers (Decay Step Number and Decay Step Size) 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 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 ms.
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 05h.
Sout Limit Value
: Stores the variable limit for Sout. The interpretation of these bits is not direct: 00111 maps to
default value = 1F40h. Limit level = 0L
4
L
3
L
2
L
1
L
0
11 0100 0000 , range: 0340h - 7F40h.
L
4-0
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 (896) - [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
896 - [NS
7-0
x SS] = 896 - [4 x (4x2
4
)] =
640
taps for a filter length of 896 taps.
相關(guān)PDF資料
PDF描述
ZL38002QDG1 Low-Voltage Acoustic Echo Canceller With Noise Reduction
ZL38002 Low-Voltage Acoustic Echo Canceller With Noise Reduction
ZL38002DGA1 Low-Voltage Acoustic Echo Canceller With Noise Reduction
ZL38002DGB1 Low-Voltage Acoustic Echo Canceller With Noise Reduction
ZL38065 32 Channel Voice Echo Canceller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ZL38002QDG1 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 1CH G.711 W/OUT TONE DETECTION 48TQFP - Trays 制造商:Zarlink Semiconductor Inc 功能描述:ECHO CANCELLER CHIP 1CH G.711 W/OUT TONE DETECTION 48TQFP - Trays
ZL38003 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:AEC with Noise Reduction & Codecs for Digital Hands-Free Communication
ZL38003_06 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:AEC with Noise Reduction & Codecs for Digital Hands-Free Communication
ZL38003GMG 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 1CH G.711/G.712 W/OUT TONE DETECTION 81C - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC ECHO CANCEL DUAL CODEC 81CBGA 制造商:Microsemi Corporation 功能描述:IC ECHO CANCEL DUAL CODEC 81CBGA
ZL38003GMG2 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 1CH G.711/G.712 W/OUT TONE DETECTION 81C - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC ECHO CANCEL DUAL CODEC 81CBGA 制造商:Microsemi Corporation 功能描述:IC ECHO CANCEL DUAL CODEC 81CBGA
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