Sub-band signal processor

Details Sub-band signal processor Sub-band signal processor

H - Electricity

03

H

H03H 11/04 (2006.01) H03H 17/02 (2006.01) H03H 21/00 (2006.01) H04B 3/23 (2006.01)

Patent

CA 2164025

Delay in subband processing of audio systems is substantially reduced by employing minimum phase filers in both the analysis and synthesis filter banks. This is possible because it was recognized that the human auditory system is relatively insensitive to phase distortion in the processed audio signals. The use of the minimum phase filters in both the analysis and synthesis filter banks allows finer separation of the subband frequencies than might ordinarily be acceptable with linear phase filters and possibly the added benefit of reduced processing requirements. A specific example of using minimum phase filters in a subband echo canceler is given.

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