Parallel off hook detector for electronic remote data recorder

Details Parallel off hook detector for electronic remote data recorder Parallel off hook detector for electronic remote data recorder

1987-11-12

1989-03-07

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379107, H04M 1100

Patent

active

048113891

ABSTRACT:
A parallel off hook detector for an electronic remote data recorder includes a short-integrator and a long-term integrator, both monitoring the voltage on a line. The integrated outputs of the short-term and long-term integrators are compared to determine whether the outputs maintain a predetermined difference for a predetermined minimum time characteristic of an impedance being connected across or removed from the line.

REFERENCES:
patent: 4022989 (1977-05-01), Hoppough
patent: 4323734 (1982-04-01), Kimzey
patent: 4525603 (1985-06-01), Bond
patent: 4540853 (1985-09-01), Albouy
patent: 4674117 (1987-06-01), Burns

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