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CS6403-IL Datasheet(PDF) 8 Page - Cirrus Logic

Part No. CS6403-IL
Description  Echo-Cancelling Codec
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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Echo Canceller Characteristics
The typical Echo Return-Loss Enhancement
(ERLE)
convergence
characteristics
for
the
CS6403 are illustrated in the above diagram
under the following conditions:
• Echo-canceller length: 512 taps
• Echo-canceller initial conditions: zeroed filter
taps, updates disabled until t=0.125s
• Sampling rate: 8 kHz
• Echo path (including microphone, speaker,
and amplifiers):
- spectrally flat
-linear
- duration < 64 ms
- noise free
- time invariant
60.0
40.0
20.0
0.0
Seconds
0.02.0
4.06.0
8.0
ERLE
Speech Training Signal
-0.3
0.0
0.3
Figure 1. Typical ERLE Convergence Characteristics
• Near-end high-pass filter: enabled
• Pre-emphasis filter: enabled
• Graded-beta profile: 64 echo-canceller filter
taps processed per 2x reduction in update gain
• Training signal: speech, full scale
• Unlimited S/(N+D) on linear ADC
Note:
Many of these conditions may be
significantly different in real
applications, resulting in significantly
different measured ERLE performance.
CS6403
8
DS192PP6




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