Method and apparatus for detecting a light signal in the presenc

Details Method and apparatus for detecting a light signal in the presenc Method and apparatus for detecting a light signal in the presenc

1995-02-28

1996-12-17

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214C, 359162, 327551, H01J 4014

Patent

active

055856233

ABSTRACT:
An apparatus for detecting a light signal is provided which includes a first frequency source for generating a clock signal having a fixed frequency, a light emitting portion constituted of at least a light emitting element which is driven based on the clock signal of the first frequency source and emits a light signal, and a light receiving portion disposed apart from the light emitting portion. The light receiving portion includes a light receiving element which receives the light signal emitted from the light emitting element, an amplifying circuit which amplifies the light signal received by the light receiving element, a converter which converts an analog signal given from the amplifying circuit into a digital signal, a second frequency source for generating a clock signal having a fixed frequency, and a summing portion which samples the digital signals given from the converter synchronously with the second frequency source plural times at regular intervals during at least one period of the light signal and then, during a plurality of the periods of the light signal, sums sampled values obtained in turn during the one period.

REFERENCES:
patent: 4789837 (1988-12-01), Ridgers
patent: 4903339 (1990-02-01), Solomon
patent: 5422752 (1995-06-01), Hardcastle

Affiliated with

Also associated with

Rating

Method and apparatus for detecting a light signal in the presenc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for detecting a light signal in the presenc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for detecting a light signal in the presenc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1993217