Patent ID: 8634575
Filing Date: 2014-01-21
Classification: H04M,H04R

Abstract:
1. A method of reducing acoustic feedback in a system comprising: sequentially converting a buffered acoustic signal to a plurality of sequential frames in a frequency domain, each frame comprising an array of frequency magnitude bins, where each bin represents a fixed width of the frequency spectrum and contains corresponding frequency components of the acoustic signal divided into corresponding bins; comparing a first value of a first frequency magnitude bin that is included in a first frame of the sequential frames with a second value of the first frequency magnitude bin that is included in a second frame of the sequential frames; updating the first frequency magnitude bin, in response to the second value being greater than the first value, with a value determined as a function of the first value, the second value and a determined filter coefficient; selecting the updated first frequency magnitude bin to be a candidate frequency; and setting a notch filter to the candidate frequency at an attenuation depth and a bandwidth to suppress feedback.