| 摘要 |
<p>A hearing aid apparatus and method of the type in which audio frequency signals (12) are frequency upshift to ultrasonic frequency bands and are applied as vibrations to the human body (21) to generate a hearing response. Frequency upshifting of the audio frequency signals (12) to the ultrasonic frequency band is attained in one embodiment by amplitude modulation of an ultrasonic frequency carrier signal (15) with an audio frequency modulating signal to form a modulated signal in which one of the two sidebands is either completely or substantially suppressed and a modulated signal (17) having only one predominant sideband is thus derived for application to the human sensory system to generate a hearing response.</p> |
