Patent ID: 6937738
Filing Date: 2005-08-30
Classification: H04R

Abstract:
1. A digital hearing aid, comprising: a front microphone that receives an acoustical intended signal and generates an analog intended signal; a front microphone analog-to-digital converter coupled to the front microphone that converts the analog intended signal to a digital intended signal; a rear microphone that receives an acoustical occlusion signal from the ear canal of a digital hearing aid user and generates an analog occlusion signal; a rear microphone analog-to-digital converter coupled to the rear microphone that converts the analog occlusion signal to a digital occlusion signal; a sound processor coupled to the front microphone analog-to-digital converter that selectively modifies the frequency response of the digital occlusion signal to match pre-selected signal characteristics and generates a processed intended signal; an occlusion sub-system coupled to the processed intended signal and the digital occlusion signal that subtracts the digital occlusion signal from the processed intended signal and generates an occlusion sub-system output signal; a digital-to-analog converter coupled to the occlusion sub-system that converts the occlusion sub-system output signal into an analog hearing aid output signal; and a speaker coupled to the digital-to-analog converter that converts the analog hearing aid output signal to an acoustical hearing aid output signal that is directed into the ear canal of the digital hearing aid user.