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:
Nov. 30, 1999
Filed:
May. 08, 1997
Karl W Rabe, Chapel Hill, NC (US);
Ericsson Inc., Research Triangle Park, NC (US);
Abstract
Transducer circuitry, and an associated method, converts acoustic signals into electrical signals. The transducer circuitry includes a diaphragm which is positioned to receive acoustic signals, such as voice signals. Displacement of the diaphragm responsive to reception of the acoustic signals is detected by directing light energy towards the diaphragm and detecting characteristics of the light energy reflected off of the diaphragm. Changes in the characteristics of the light energy are determinative of the displacement of the diaphragm and, in turn, values of the acoustic signals received by the diaphragm. When embodied in a radiotelephonic device, the diaphragm can be positioned at a location best to detect voice signals generated by a user without the need to position electrical leads to extend to the diaphragm, or a winding positioned thereabout, to detect displacement of the diaphragm.