Double-talk detection schemes for echo cancellation

Heping Ding, Frank Lau

Abstract


Two new double-talk detection schemes for echo cancellation are presented. The first scheme, out-of-telephony-band level, includes an analog input sampled at 16 KHz, double the telephony system's sampling rate. It effectively detects the near-end signal masked by a much stronger telephony if a wider band is made available by the electronics, making it suitable for speakerphone applications. The second scheme, orthogonality principle, does not need a wider band and therefore is suitable for general echo cancellation.

Keywords


Adaptive algorithms; Adaptive filtering; Approximation theory; Bandwidth; Computer simulation; FIR filters; Natural frequencies; Parameter estimation; Signal detection; Telecommunication systems; Double-talk detection; Near-end signals; Orthogonality principle; Residual echo

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