Double-talk detection schemes for echo cancellation


  • Heping Ding Acoustics and Signal Processing, IMS, National Research Council, 1200 Montreal Rd., Ottawa, Ont. K1A 0R6
  • Frank Lau Nortel Networks, Westwinds Innovation Center, 5050 40th St. NE, Calgary, Alta. T3J 4P8


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


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.

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How to Cite

Ding H, Lau F. Double-talk detection schemes for echo cancellation. Canadian Acoustics [Internet]. 2004 Sep. 1 [cited 2024 Jun. 16];32(3):146-7. Available from:



Proceedings of the Acoustics Week in Canada