METHOD OF SIGNAL PROCESSING IN A HEARING AID SYSTEM AND A HEARING AID SYSTEM

摘要

A method of noise suppression in a hearing aid system by providing an improved noise estimate derived from the difference of a first digital audio signal provided by a first input transducer and an adaptively filtered second digital audio signal provided by a second input transducer. The invention further provides a hearing aid (100, 200) and a hearing aid system (300 and 400) adapted for improving noise suppression in accordance with this method.

主权项

1. A method of processing signals in a hearing aid system comprising the steps of:
providing a first input signal representing the output from a first input transducer of the hearing aid system; providing a second input signal representing the output from a second input transducer of the hearing aid system; using a time-varying adaptive filter to filter the first input signal, hereby providing a filtered first input signal; subtracting the filtered first input signal from the second input signal to form a difference signal; adapting the time-varying adaptive filter in accordance with a control algorithm; calculating a power estimate of the difference signal hereby providing a noise estimate; providing the noise estimate as input to a noise suppression gain calculator; using the noise suppression gain calculator to provide a time-varying gain adapted for suppressing noise; and applying said time-varying gain to the second input signal.