CS6403 datasheet(8/54 Pages) CIRRUS

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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

DS192PP6

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