1976-11-11
1978-01-31
Claffy, Kathleen H.
H04G 136
Patent
active
040717089
ABSTRACT:
A dial pulse detector apparatus accurately detects the occurrence of dial pulses in the presence of adverse line conditions resulting in severe signal distortions due to inductive effects, noise and loading by other pieces of equipment. Signals greater than two different selected threshold levels are examined for, and signals less than the lower threshold are also examined for. Signals greater than the threshold levels are counted up on a time duration basis and added in a weighting arrangement. Signals less than the lower threshold are counted on a time duration basis and are subtracted from the added signals. When the combined signal counts reach a first specified count a dial pulse break signal is recognized. Signal counting is continued and when the combined signal counts reach a second specified count a dial pulse make signal is recognized, thereby completing the detection of a dial pulse. Because of the weighting system it would be possible to erroneously record the occurrence of two dial pulses in a time interval when only one dial pulse could validly occur. This is prevented by the use of a real-time counter which forces a minimum recognition time for a dial pulse break signal.
REFERENCES:
patent: 3671875 (1972-06-01), Pento
patent: 3700821 (1972-10-01), Savage
patent: 3828141 (1974-08-01), De Marco
patent: 3851110 (1974-11-01), Kelly
Herbster Terry N.
Holden Alan F.
Kaplan Murray L.
Claffy Kathleen H.
Popek Joseph A.
Telesciences, Inc.
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