Study on mechanical feedback of hearing aids using maximum length sequence method

Abstract

Mechanical feedback is one of reasons causing hearing aids to howl, therefore the mechanical feedback problems of behind the ear (BTE) hearing aids was investigated by the maximum length sequence (MLS). The realtime data transmission was set up between a BTE digital hearing aid and a computer. The feedback path form the input port of receiver to the output port of microphone was measured with different input magnitude of receiver, in order to investigate the effect of mechanical feedback on the whole feedback path. The experience results verified the availability of the method.