FREQUENCY TRANSPOSITIONAL HEARING AID WITH DIGITAL AND SINGLE SIDEBAND MODULATION

摘要

Apparatus and method for shifting the frequency range of an audio frequency range signal using digital frequency shifting and single sideband amplitude modulation techniques. In one embodiment, the audio signa l (2) is shifted to an ultrasonic frequency range utiliz ing digital signal processing techniques in which an audio frequency signal is f requency shifted by modulation to a carrier frequency an d in which a single sideband modulated signal (6) is formed.