Method and apparatus for detecting the presence of signal compon

Details Method and apparatus for detecting the presence of signal compon Method and apparatus for detecting the presence of signal compon

1976-01-26

1978-08-22

Stewart, David L.

179 84VF, H04J 312

Patent

active

041091094

ABSTRACT:
Method and apparatus for detecting the presence of signal components of predetermined frequency, in multifrequency PCM signal, especially in signalling tones. The incoming signal is multiplied by sine and cosine waveforms representing a particular frequency, for each of the frequencies to be detected, the two sets of multiplicands thus derived are summed. If the sum is greater than a reference value, said particular frequency is present in the incoming signal.

REFERENCES:
patent: 3863030 (1975-01-01), Mills
patent: 3882283 (1975-05-01), Proudfoot

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