Telephone inadvertent off-hook condition detector

Details Telephone inadvertent off-hook condition detector Telephone inadvertent off-hook condition detector

1994-09-29

1997-01-07

Chin, Wellington

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Monitoring

379 1, 379 27, 379 28, 379 34, 379377, 379381, 379418, 379424, H04M 124, H04M 322, H04M 300, H04M 100

Patent

active

055925294

ABSTRACT:
An inadvertent-off-hook-condition detecting apparatus for use with a telephone connected to a telephone system is described. The telephone has a hookswitch which connects the voice network of the telephone system across the input lines to the telephone when the hookswitch is in an off-hook position, and which disconnects the voice network from the telephone input lines when the hookswitch is in an on-hook position. The inadvertent-off-hook-condition detecting apparatus has detecting circuit coupled to the telephone for detecting a prespecified signal indicating that the local or remote party wishes to continue the telephone conversation; a timer coupled to the detecting circuit and to the telephone for determining whether the elapsed time since the most recent of the events comprising (1) existence of an on-hook condition and (2) detection of the prespecified signal, is in excess of a prespecified time interval; and an output generator coupled to the timer for producing an output signal indicative of whether the prespecified time interval has been exceeded.

REFERENCES:
patent: 3038965 (1962-04-01), Civitano
patent: 3150237 (1964-05-01), Baldik
patent: 4156799 (1979-05-01), Cave
patent: 4686697 (1987-08-01), Shapiro
patent: 4922529 (1990-05-01), Kiel
patent: 4998271 (1991-03-01), Tortola et al.
patent: 5142572 (1992-08-01), Hopkins
patent: 5263081 (1993-11-01), Nightingale
patent: 5355407 (1994-10-01), Lazik
patent: 5390249 (1995-02-01), Park

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