Patent ID: 9398380
Filing Date: 2016-07-19
CPC Classification: H03H,H04R

Claim Text:
1. A method of controlling an adaptation increment of an adaptive filter of a hearing apparatus for feedback reduction, the method comprising: picking up a sound signal by a microphone of the hearing apparatus and outputting a corresponding microphone signal; feeding the microphone signal to a signal processing device and generating with the signal processing device an earpiece signal for an earpiece of the hearing apparatus based on the microphone signal; and feeding the earpiece signal to an adaptive filter and subtracting an output signal of the adaptive filter from the microphone signal for reducing a feedback signal in the microphone signal; feeding the microphone signal, after subtracting the output signal of the adaptive filter, to a central signal processing unit and producing an output signal; obtaining an autocorrelation value from sampled values of the microphone signal between which a time difference exists; controlling an adaptation increment of the adaptive filter based on the autocorrelation value; shifting a frequency of the output signal to thereby obtain the earpiece signal; and controlling the time difference for obtaining the autocorrelation value as a function of the shifting of the frequency of the output signal.