參數(shù)資料
型號： ZL50212
廠商： Zarlink Semiconductor Inc.
英文描述： 288 Channel Voice Echo Canceller
中文描述： 288頻道語音回聲消除器
文件頁數(shù)： 31/43頁
文件大?。?/td> 2166K
代理商： ZL50212
Data Sheet
ZL50212
31
Zarlink Semiconductor Inc.
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.
相關(guān)PDF資料
PDF描述
ZL50232GDC 32 Channel Voice Echo Canceller
ZL50232QCC Aluminum Electrolytic Capacitor; Capacitor Type:General Purpose; Voltage Rating:35VDC; Capacitor Dielectric Material:Aluminum Electrolytic; Operating Temperature Range:-40 C to +85 C; Capacitance:47uF RoHS Compliant: Yes
ZL50232QCC1 32 Channel Voice Echo Canceller
ZL50232 32 Channel Voice Echo Canceller
ZL50233GD 4 Channel Voice Echo Cancellor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ZL50212/GBC 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 288CH G.164/G.165/G.168/G.711 W/ TONE DE - Trays
ZL50212GB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm/Datacomm
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
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*