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CS6403-IL Datasheet(PDF) 8 Page - Cirrus Logic |
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CS6403-IL Datasheet(HTML) 8 Page - Cirrus Logic |
8 / 54 page 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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