Patent ID: 8116473
Filing Date: 2012-02-14
Classification: H04M,H04R

Abstract:
1. An apparatus, comprising: a sensor to receive sound and convert it to an electrical signal; an analog-to-digital converter to convert the electrical signal into a digital signal; a summing node receiving the digital signal and an acoustic feedback compensation signal Y(z) adapted to correct for acoustic feedback received by the sensor, the summing node providing an error signal E(z) by subtraction of the acoustic feedback compensation signal Y(z) from the digital signal; a signal processing module and a phase adjustment module processing the error signal E(z) in series to produce an output signal X(z); an adaptive filter including an adaptive algorithm receiving the error signal E(z), the adaptive filter producing the feedback compensation signal Y(z); a digital-to-analog converter providing an analog version of the output signal X(z); and a receiver to output processed sound from the analog version, wherein the phase adjustment module is programmable to gradually cycle phase applied to the output signal X(z) in phase change increments over a predetermined range of phase to avoid or contain entrainment of a filter of the adaptive filter.