Patent ID: 8737655

Claim:
A maximum stable gain measurement system for a hearing assistance device, comprising: a microphone connected to convert received sound into a signal; a receiver configured to play sound; a processing channel adapted to process the signal and provide an output signal to an output node, the processing channel comprising: a white noise generator programmed to provide a white noise signal to the output node which is played by the receiver; and an adaptive filter having step-size control, the adaptive filter including a first input sampled from the output node and a second input sampled from a subtraction of an output of the adaptive filter and the signal from the microphone; and wherein the receiver is connected to the output node adapted to play signals at the output node, wherein the processing channel is programmed to adapt the adaptive filter using step-size control during injection of the white noise signal in a first mode of operation and to stop adaptation of coefficients in a second mode of operation; a bulk delay adapted to receive a white noise signal; and an acoustic feedback canceller connected to the bulk delay and to a time-domain filter using the coefficients of the adaptive filter, the time-domain filter connected to receive the white noise signal, the acoustic feedback canceller programmed to adapt during an injection of the white noise signal into the time-domain filter and the bulk delay in a third mode of operation and to freeze the parameters of the acoustic feedback canceller in a fourth mode of operation.