Light source frequency detection circuit using bipolar...

Details Light source frequency detection circuit using bipolar... Light source frequency detection circuit using bipolar...

2007-11-19

2010-12-07

Tran, Sinh (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S226100

Reexamination Certificate

active

07847834

ABSTRACT:
An apparatus for measuring the power frequency of a light source includes a photo-sensitive transistor, a modulators and a logic unit. The photo-sensitive transistor generates an electrical signal that is responsive to light incident thereon from the light source. The modulator generates a modulated signal based on the electrical signal that toggles at a rate substantially proportional to the power frequency of the light source. The logic unit is coupled to receive the modulated signal and determine its toggling frequency.

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