Method for control of adaptation of feedback suppression in a hearing aid, and a hearing aid

摘要

A method for controlling adaptation of a feedback suppression filter in a hearing aid comprises the step of suspending the adaptation of the feedback suppression filter when the level of a hearing aid reference signal is below a predetermined threshold. The invention further provides a hearing aid with a feedback suppression filter and with means for suspending adaptation of the feedback suppression filter.

主权项

1. A method of controlling adaptation of a feedback suppression filter in a hearing aid, comprising the steps of:
converting an input sound into a microphone output signal; deriving an input signal from the microphone output signal; subtracting a feedback suppression signal from the input signal hereby providing a hearing aid processor input signal; adapting filter coefficients of a feedback suppression filter using the hearing aid processor input signal as control signal; forming a hearing aid processor output signal by applying an amplification gain to the hearing aid processor input signal; filtering the hearing aid processor output signal in the feedback suppression filter to derive the feedback suppression signal; and suspending the adaptation of the feedback suppression filter when the level of a hearing aid reference signal is below a predetermined threshold, thereby indicating there is insufficient sound signal available for adaptation of said feedback suppression filter.