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): 15/128頁
文件大?。?/td> 2328K
代理商: TECO3264
Data Sheet
August 1999
TECO3264 32-Channel Echo Canceller
15
Lucent Technologies Inc.
External Control Connection
(continued)
Microprocessor Interface and Control
(MPIC)
(continued)
Fast/Slow Convergence Control (F_CONV)
NLP threshold and gain are the primary parameters
that determine convergence rate of the canceller. The
gain calculation function provisions a value for the gain
parameter and a value for the occurrence of any single
unmasked event.
The four events which cause the fast convergence
parameters to be chosen are:
1. H-register reset
2. External event such as call boundary
3. VPA tone detection
4. samples > Y samples times a threshold parameter
There is a serial output that indicates, on a per-
channel basis, the convergence mode of each channel.
See output pin TEST7.
Transient NLP Control (TRNLP)
The transient NLP control circuit can enable the NLP
whenever the power in (t) exceeds the power in Y by
a programmable threshold. These conditions exist on a
transient basis and generally indicate that the echo
canceller is not converged.
NLP Control
The NLP control function enables the NLP whenever
the magnitude of (t) exceeds the maximum magni-
tude of the samples in the X register times the NLP
threshold selected by the F_CONV function when this
feature is enabled.
The NLP may also be enabled by external command
via the microprocessor interface or external input.
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