Patent ID: 7020297
Filing Date: 2006-03-28
Classification: H04R

Abstract:
1. An acoustic feedback cancellation apparatus, comprising: an analysis filter bank operable to divide a digital audio signal into a plurality of digital subband signals; a plurality of subtractors configured to subtract a plurality of estimated feedback subband signals from the plurality of digital subband signals to provide a plurality of digital error subband signals; a plurality of digital signal processors configured to receive the plurality of digital error subband signals and provide a plurality of processed digital subband signals; a synthesis filter bank configured to combine the plurality of processed digital subband signals and provide a processed wideband digital audio signal; and an acoustic feedback cancellation loop coupled between the synthesis filter bank and the plurality of subtractors, said acoustic feedback cancellation loop comprising a plurality of cascaded training and a tracking filters operable to produce the plurality of estimated feedback subband signals.