Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Converting input voltage to output current or vice versa
Patent
1994-11-08
1998-04-28
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Converting input voltage to output current or vice versa
327514, 327561, H01J 4016
Patent
active
057449872
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.
REFERENCES:
patent: 3706844 (1972-12-01), Besier et al.
patent: 4179713 (1979-12-01), Freudenschuss et al.
patent: 4599715 (1986-07-01), Beard
patent: 4691112 (1987-09-01), Wydler
patent: 4877953 (1989-10-01), Yamamuro
patent: 5367248 (1994-11-01), Lin
Embree Milton L.
Embree Paul M.
Callahan Timothy P.
Lam T. T.
Lucent Technologies - Inc.
Rode, Esq. Lise A.
Sony Corporation
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