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| 型號(hào)： | 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(yè)數(shù)： | 14/128頁(yè) |
| 文件大?。?/td> | 2328K |
| 代理商： | TECO3264 |
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Data Sheet
August 1999
TECO3264 32-Channel Echo Canceller
14
Lucent Technologies Inc.
External Control Connection
Microprocessor Interface and Control
(MPIC)
As given in the Functional Description section on
page 13, the microprocessor interface and control
block functions to (1) provide microprocessor access
to the control, provisioning, option, status, and alarm
registers of the echo canceller and (2) to generate the
signals required to control the operation of all echo
canceller functions. The following paragraphs
describe the functions performed in the MPIC block.
The internal register description sections which follow
detail the parameter register information and format
for each of the user-provisionable device characteris-
tics.
Channel Control (CHAN_CTRL)
The channel control function combines inputs from the
tone disabler with the user-provisionable mask and
enable register information and external inputs to gen-
erate the channel bypass and canceller enable signals.
Narrowband Energy Detector (NBE)
The narrowband energy detector measures the X sig-
nal input characteristics to differentiate between wide-
band and narrowband signals. Based on this
determination, the near-end speech detector threshold
is provisioned. In addition, this information is used in
setting the gain applied in the echo cancellation.
Near-End Speech Detectors (NES)
The function of the near-end speech detectors is to dif-
ferentiate between far-end echo and near-end speech
at the Y input port of the canceller. The H-register
updates should only be allowed if the Y input signal is
due to far-end echo and not due to near-end speech.
Two measures of near-end speech are provided.
The near-end speech detector compares the magni-
tude of the samples in the X register to the magnitude
of the Y samples. By comparing the relative magni-
tudes of the X samples and Y samples, the existence
of near-end speech can be deduced.
Far-End Speech Detector (FES)
The function of the far-end speech detector is to deter-
mine whether there is any far-end speech present. If
there is no far-end speech, there can be no echo signal
and the H-register updates should be frozen.
In the far-end speech detector, the X sample magni-
tude is compared to a threshold parameter value and a
far-end speech condition is asserted whenever the
threshold value is exceeded.
H-Register Freeze
The H-register update is frozen whenever:
I
NBE is declared and NBE detection is unmasked, or
I
NES is declared and NES detection is unmasked, or
I
FES is not declared and FES detection is unmasked,
or
I
External freeze is requested via the microprocessor
interface or external input.
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