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| 型号： | ECHOCANCELFS |
| 英文描述： | Freescale Semiconductor Digital Network Echo Cancellers |
| 中文描述： | 飞思卡尔数字网络回声消除 |
| 文件页数： | 1/2页 |
| 文件大小： | 250K |
| 代理商： | ECHOCANCELFS |
Processor
StarCore Family of Digital Signal
Processors from Freescale
Introduction
Freescale echo cancellation solutions
include a set of network echo cancellers
for various market requirements and
applications. Equipped with Freescale
technologies, the solutions offer
carrier-class echo cancellation service for
packet telephony networks. The echo
cancellers are designed to cover up to
128 ms echo path delay with one 24 ms
moving window. This 24 ms window is
sufficient to handle the multi-reflective echo
paths in G.168 (2002) and others that are
expected to be encountered in the network.
The echo path delay of the echo canceller
is runtime configurable, from 8 ms up to
128 ms, so users may choose a proper
configuration to meet the need of echo path
configurations (or spans) and the resource
budget in per channel data memory and
processing load million cycles per
second (MCPS).
Digital Network Echo Cancellers
Features
Freescale Semiconductor’s* echo cancellation
solutions are robust, field-proven
implementations with more than 15 years
global deployment into Tier 1 carrier-class
telecommunications infrastructure products.
The echo cancellers are based on normalized
LMS adaptive algorithms and have the
following major features:
> Rapid initial convergence rate
(echo cancelled within 50 ms)
> Far-reaching and stable infinite
convergence depth
> Intelligent near-end talk signal
detection mechanism
> Adaptive nonlinear processor with
optional comfort noise matching
> Innovative mechanism for near-end
background noise handling
> Effective background processing for
divergence prevention
> Runtime configurable echo-span
coverage from 8 ms up to 128 ms
> Fast mid-call convergence
(i.e., re-convergence upon hybrid
change in the middle of a call)
> Four configurable comfort noise
matching levels
> Smart handling of signaling tones
The echo cancellers are ITU-T G.168
(2000/2002) compliant, and systematically
evaluated with Freescale voice quality
evaluation techniques and by
independent expert groups.
Echo
Error
Signal
Echo
Estimate
Echo
Near End
Sin (signal from near end)
Sout (signal to far end)
Rout (signal to near end)
Rin (signal from far end)
Hybrid
+
-
Double
Talk
Detector
Echo
Canceller
Controller
Adaptive
Filter
HPF
Delay
HPF
Pure
Delay
Estimator
Delay
Nonlinear
Processor
Freescale IPs
FREESCALE ECHO CANCELLER BLOCK DIAGRAM
Digital Signal Processors
*The Semiconductor Products Sector of Motorola, Inc. became Freescale Semiconductor, Inc. in 2004.
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