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:
Dec. 24, 2002
Filed:
Jan. 16, 2001
Alexander Paritsky, Modiin, IL;
Phone-Or Ltd., Or-Yehuda, IL;
Abstract
The invention provides an echo-cancelling system for an optical microphone, for eliminating acoustical echoes from a source of acoustical signals to which the microphone is connected, the system including a source of light for illuminating the acoustical membrane; a photodetector for receiving light reflected from the membrane and for producing output signals; means for supplying power to the source of light; a preamplifier for amplifying the output signals; an input terminal for receiving electrical signals from the source of acoustical signals; a time delay circuit for receiving signals from the source of acoustical signals, and a circuit for regulating the amplitude of the delayed electrical signals, connected between the delay circuit and the source of light, for changing the current supplied to the source of light by the light source power means.