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参数资料
| 型号： | ZL50233/GDG |
| 厂商： | ZARLINK SEMICONDUCTOR INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | DATACOM, ISDN ECHO CANCELLER, PBGA208 |
| 封装： | 17 X 17 MM, 1.30 MM HEIGHT, MO-192, LBGA-208 |
| 文件页数： | 16/38页 |
| 文件大小： | 547K |
| 代理商： | ZL50233/GDG |
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ZL50233
Data Sheet
23
Zarlink Semiconductor Inc.
Figure 12 - The MU Profile
9.0
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
s (64 ms/512 taps).
FD7-0 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 FD7-0 x 8 taps. For example; If FD7-0 = 5, then MU=2
-16 for the first 40 taps of the echo
canceller FIR filter. The valid range of FD7-0 is: 0 ≤ FD7-0 ≤ 64 in normal mode and 0 ≤ FD7-0 ≤ 128 in
extended-delay mode. The default value of FD7-0 is zero.
SSC2-0 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 x2SSC2-0. For example; If SSC2-0 = 4, then MU is reduced by a factor of 2 every 64 taps of
the FIR filter. The default value of SSC2-0 is 04hex.
NS7-0 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 SSC2-0). The start of the exponential decay is defined as: Filter Length
(512 or 1024) - [Decay Step Number (NS7-0) x Step Size (SS)] where SS = 4 x2
SSC2-0.
For example; If NS7-0=4 and SSC2-0=4, then the exponential decay start value is 512 - [NS7-0 x SS] =
512 - [4 x (4x24)] = 256 taps for a filter length of 512 taps.
Amplitude of MU
Time
Flat Delay (FD7-0)
Step Size (SS)
1.0
2-16
FIR Filter Length (512 or 1024 taps)
Number of Steps (NS7-0)
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相关代理商/技术参数 |
参数描述 |
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| ZL50233QC | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:4 Channel Voice Echo Cancellor |
| ZL50233QCC | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:4 Channel Voice Echo Cancellor |
| ZL50233QCG1 | 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 4-CH 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 CANCEL 4CH 100LQFP 制造商:Microsemi Corporation 功能描述:IC VOICE ECHO CANCEL 4CH 100LQFP |
| ZL50234 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:8 Channel Voice Echo Canceller |
| ZL50234/GDC | 制造商:Microsemi Corporation 功能描述:ECHO Canceller Chip 8-CH G.164/G.165/G.168/G.711 With Tone Detection 208-Pin LBGA Tray 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 8CH G.164/G.165/G.168/G.711 W/ TONE DETE - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC VOICE ECHO CANCEL 8CH 208LBGA 制造商:Microsemi Corporation 功能描述:IC VOICE ECHO CANCEL 8CH 208LBGA |
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