GMDF for noise reduction and echo cancellation

摘要

A noise-reduction (NR) enhancement to the generalized multi-delaynfrequency domain algorithm (GMDF) involving minimal additionalncomputations is presented. Findings are presented on the ability of thenalgorithm to suppress street, office, air-conditioning and car noisenfrom the microphone signal in hands-free telephony. For an additionalneleven N/P real multiplies and eight N/P real additions per outputnsample, where N is the block size and P is the amount of output samplesnper GMDF iteration, results show an average increase in echo return lossnenhancement (ERLE) of 9 dB at low SNR (-5 dB) and 6 dB at higher SNR (15ndB)