Patent ID: 8634576
Filing Date: 2014-01-21
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 frequency analysis module to produce frequency domain subband signals from the digital signal; a summing node receiving the frequency domain subband signals and acoustic feedback compensation subband signals AFC(k) adapted to correct for acoustic feedback received by the sensor, the summing node providing error subband signals E(k) by subtraction of the received signals; a complex multiplier producing a gradually phase shifted version of the error subband signals E′(k); a hearing aid signal processing module to process the phase shifted error subband signals E′(k); a time synthesis module to produce time domain, processed, digital signals; a digital-to-analog converter providing an analog version of the processed, digital signals; and a receiver to produce processed sound from the analog version; wherein the processed, digital signals are passed through a bulk delay and converted back into frequency domain signals to be used for acoustic feedback cancellation by an adaptive filter which produces the acoustic feedback compensation subband signals AFC(k).