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
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


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.
How to Cite
Ding H, Lau F. Double-talk detection schemes for echo cancellation. Canadian Acoustics [Internet]. 2004Sep.1 [cited 2020Feb.24];32(3):146-7. Available from: //
Proceedings of the Acoustics Week in Canada