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:
Apr. 28, 1998
Filed:
Nov. 08, 1994
Paul M Embree, Irvine, CA (US);
Milton L Embree, Reading, PA (US);
Sony Corporation, Tokyo, JP;
Sony Pictures Entertainment, Park Ridge, NJ (US);
Lucent Technologies, Inc., Murray Hill, NJ (US);
Abstract
A device for providing a balanced input over a photoelectric cell used in a motion picture film projector and for providing an unbalanced output audio signal for driving subsequent elements in an audio reproduction unit connected to the motion picture film projector, wherein the reproduced output audio signal has an improved quality over that of a previously known transformer output signal. The circuit supplies an unbalanced voltage signal in response to a current generated by a photoelectric cell having at least a first and second terminal. The circuit includes: a current to voltage converter for receiving the current from the first terminal of the photoelectric cell and providing a first output voltage and a current return unit connected to the current to voltage converter for receiving the first output voltage and for providing a second output voltage and for providing a return current along the second terminal of the photoelectric cell. The circuit may also include a balanced to unbalanced voltage converter for receiving the first and second output voltages and for providing a third output voltage which is free of common mode signals, wherein the first and second output voltages comprise a balanced signal and the third output voltage comprises an unbalanced signal.