This paper presents a normalized cross-correlationbased doubletalk detector for use in a critically sampled subband acoustic echo canceller. The algorithm is derived from an existing doubletalk detector for fullband echo cancellers. The resulting per-subband doubletalk detectors are allowed to control adaptation independently in each subband. Computational complexity reduction techniques are described, along with a noise estimation scheme to compensate for the effects of background noise in hands-free and vehicular environments. Simulation results with narrowband speech doubletalk signals show that the proposed structure can achieve a higher level of convergence than a global doubletalk decision in the presence of doubletalk. Detection probability results are also presented.

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Keywords Acoustic echo cancellation, Doubletalk detection, Hands-free telephony, Subband adaptive filters
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Conference 62nd Vehicular Technology Conference, VTC 2005
Gordy, J.D., & Goubran, R. (2005). A subband doubletalk detector for echo cancellation in hands-free environments. In IEEE Vehicular Technology Conference (pp. 1397–1401). doi:10.1109/VETECF.2005.1558169