Signal detecting circuit

Details Signal detecting circuit Signal detecting circuit

G - Physics

01

R

354/138

G01R 23/00 (2006.01) H04N 9/455 (2006.01)

Patent

CA 1173163

SIGNAL DETECTING CIRCUIT ABSTRACT OF THE DISCLOSURE A signal detecting circuit detects the presence in an input signal of a component of a predetermined frequency fp. The circuit includes a sampling arrangement for sampling the input signal at predetermined times separated by a sampling period l/fs and providing first, second, and third signal samples. An adding circuit provides a sum signal A+C from the first and third signal samples, and a calculating circuit provides a calculated signal 2Bcos.THETA. from the second signal sample, where e is the phase relation of the signal samples 2.pi. fs/fp. A comparator provides an output signal when the values of the sum signal A+B and the calculated signal 2Bcos.THETA. are substantially equal, indicating the presence of the component of interest.

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