Double-talk detection schemes for 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
AbstractTwo 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.
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