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)： 94/128頁
文件大小： 2328K
代理商： TECO3264
Data Sheet
August 1999
TECO3264 32-Channel Echo Canceller
94
Lucent Technologies Inc.
Register Architecture
(continued)
Page 0 Read/Write Registers 000
—
07FE
(continued)
Variable Loss Noise Matching Select Register
Table 77. Variable Loss Noise Matching Select Register (054) [00]
Noise Floor Estimate Low Hysteresis Threshold Register
Table 78. Noise Floor Estimate Low Hysteresis Threshold Register (055) [08]
Bit
5—0
Symbol
MHI[13:0]
Parameter Name and Description
High Hysteresis Threshold NFE [13:8].
(See Noise Floor Estimate High Hysteresis
Threshold 1 Register (053) [00], Table 76, on page 93, for MHI[7:0].) High hysteresis
threshold for noise floor estimate.
Recommended value = 000000.
Variable Loss.
Sets noise matching mode to variable loss. Variable loss is enabled only
when USE_NM = 1 (see Table 81, Spectrally Matched Noise Matching Select Register
(058) [B0], on page 96 and table below).
6
VARLOSS
USE_NM
0
0
0
0
1
1
1
1
NMATCHEN
0
0
1
1
0
0
1
1
VARLOSS
0
1
0
1
0
1
0
1
Noise Matching Mode
No noise matching is inserted.
No noise matching is inserted.
White noise is inserted.
White noise is inserted.
Noise transparency is inserted.
VARLOSS option is in effect.
Noise transparency is inserted.
VARLOSS option is in effect.
0 = Insert other comfort noise [recommended value].
1 = Variable loss (enable loss pad, see ELOSS, Table 85, Loss Increment Attenuated ê 1
Register (05C) [4C], on page 98 and Table 86, Loss Increment Attenuated ê 2 Register
(05D) [8A], on page 98).
Recommended value = 0.
Enables option that when NLP is open, it will put a loss pad on E signal, for a combined
loss of 55 dB. You will be able to insert comfort noise when = 0, another noise signal is
used. When it’s small, you may hear whispers.
Noise Floor Select.
Select for colored noise matching.
7
SELNF
Matching a few dB below circuit noise is subjectively better than matching at exact level.
No spectral contrast at a little below, but with enough noise fill so that customer does not
hear chopping.
0 = Select raw noise floor estimate [recommended value].
1 = Select noise floor estimate after hystersis is applied.
Bit
7—0
Symbol
MLO[13:0]
Parameter Name and Description
Low Hysteresis Threshold NFE [7:0].
(See NLP Freeze, Soft NLP Select Register
(056) [80], Table 79, for MLO[13:8].) Low hysteresis threshold for noise floor estimate.
See MHI, Noise Floor Estimate High Hysteresis Threshold 1 Register (053) [00], Table 76
notes.
Recommended value = 00001000.
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