參數(shù)資料
型號: TECO3264
廠商: Lineage Power
英文描述: 32-Channel Echo Canceller(32通道回波清除器)
中文描述: 32通道回聲消除器(32通道回波清除器)
文件頁數(shù): 93/128頁
文件大小: 2328K
代理商: TECO3264
Data Sheet
August 1999
TECO3264 32-Channel Echo Canceller
93
Lucent Technologies Inc.
Register Architecture
(continued)
Page 0 Read/Write Registers 000
07FE
(continued)
Clamp ê Noise Floor 2 Register
Table 75. Clamp ê Noise Floor 2 Register (052) [3F]
Noise Floor Estimate High Hysteresis Threshold 1 Register
Table 76. Noise Floor Estimate High Hysteresis Threshold 1 Register (053) [00]
Bit
5—0
Symbol
EMPCLP
[13:0]
Parameter Name and Description
Clamp ê Noise Floor [13:8].
(See also Clamp ê Noise Floor 1 Register (051) [FF], Table
74, on page 92, for EMPCLP[7:0].) Clamp on ê EMP for noise floor estimate.
Recommended value = 111111.
Error Exercise Bit 0.
Test bit only. Set to 0.
Error Exercise Bit 1.
Test bit only. Set to 0.
6
7
EX0
EX1
Bit
7—0
Symbol
MHI[13:0]
Parameter Name and Description
High Hysteresis Threshold NFE [7:0].
(See Variable Loss Noise Matching Select Reg-
ister (054) [00], Table 77, on page 94, for MHI[13:8].) High hysteresis threshold for noise
floor estimate.
The noise matching circuit has the ability to match noise down to a certain level. Below
that level, the noise matching circuit matches with silence. This will allow circuits with
very low noise floors to be matched with silence. That threshold has hysteresis to prevent
the noise matching circuit from jumping from the silence state to the nonsilent state when
the noise floor estimate is right at the threshold. The MHI threshold is the high threshold,
and the MLO (Register 055) is the low threshold. If the noise floor estimate drops below
MLO, then the noise is matched with silence. The noise floor estimate must then be
raised above MHI to enable nonsilent noise matching.
The levels are 20log10([MHI, MLO]/4000).
Set MHI and MLO to 0.
Recommended value = 00000000.
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