Circuit for detecting dial pulses

Details Circuit for detecting dial pulses Circuit for detecting dial pulses

1975-05-29

1977-10-25

Claffy, Kathleen H.

H04M 150

Patent

active

040557308

ABSTRACT:
A circuit for detecting dial pulses at a receiving telephone transmitted from a sending telephone after the telephones are interconnected. Detecting circuits, including bandpass filters and summing and threshold circuits transmit a probable pulse signal. A probable pulse signal indicates that the signals on the telephone line have the characteristics present whenever the dialing mechanism at the sending telephone is actuated. A digital correlation circuit receives all the probable pulse signals and advances a counter which stores the number representing the dialed digit if a correlation exists.

REFERENCES:
patent: 3537001 (1970-10-01), Friend
patent: 3760269 (1973-09-01), Beeman
patent: 3790720 (1974-02-01), Schartmann
patent: 3912869 (1975-10-01), Ullakko
patent: 3917912 (1975-11-01), Niwa

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