The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 2001
Filed:
Mar. 16, 1994
Farid Dibachi, San Carlos, CA (US);
Charles S. Richardson, Tucson, AZ (US);
Arnold S. Lippa, Tucson, AZ (US);
Hearing Innovations Incorporated, Tucson, AZ (US);
Abstract
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, a frequency shifted single sideband, amplitude modulated signal is formed for application to the human hearing sensory system to provide enhanced hearing for hearing impaired persons. In another embodiment, the audio signal is shifted to an ultrasonic frequency range utilizing digital signal processing techniques in which an audio frequency signal is frequency shifted by modulation to a carrier frequency and in which a single sideband modulated signal is formed. The digital single sideband amplitude modulation techniques of this embodiment are also applicable to digital modulation systems for uses other than in hearing aids. In another embodiment, analog single sideband modulation is utilized for frequency shifting in a hearing aid application.