Call progress signal detector

Details Call progress signal detector Call progress signal detector

1975-12-22

1977-06-07

Olms, Douglas W.

179 5R, H04M 1106

Patent

active

040284930

ABSTRACT:
This invention relates to apparatus for automatically connecting computer terminals and the like to telephone lines and further includes means for automatically analyzing telephone line call progress signals indicative of line status. The apparatus includes a band pass filter, variable gain amplifier, AM detector, a wave shaper, a signal cadence detector and means responsive to said cadence detector for indicating line status.

REFERENCES:
patent: 3317828 (1967-05-01), Schuls
patent: 3692961 (1972-09-01), Le Strat et al.
patent: 3885108 (1975-05-01), Zock
patent: 3899645 (1975-08-01), Brafman
patent: 3952172 (1976-04-01), Penn et al.

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