CDB6403 データシートの表示（PDF） - Cirrus Logic

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CDB6403

Echo-Cancelling Codec

Cirrus Logic 

CS6403

60.0

40.0

ERLE

20.0

0.3

Speech Training Signal

0.0

0.0

0.0

2.0

4.0

6.0

Seconds

-0.3

8.0

Figure 1. Typical ERLE Convergence Characteristics

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

• 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.

8

DS192PP6

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