1978-08-16
1979-05-29
Cooper, William C.
179 6R, 179 16AA, H04M 342
Patent
active
041567994
ABSTRACT:
An automatic disconnect circuit is described for disconnecting a remote telephone in resonse to a hang-up click generated when the remote telephone goes on-hook. To distinguish a remote hang-up click from a local hang-up click, voice signals, and the like, all signals on the line are passed through a discriminator for attenuating high frequencies. Signals passing through the discriminator are sensed both as to their amplitude and their duration. Any such signal whose amplitude is too small results in no disconnect. Similarly, any such signal whose duration is atypical of a remote hang-up click results in no disconnect. Only a signal whose amplitude and duration are within predetermined limits, typical of a remote hang-up, causes the remote telephone to be disconnected.
REFERENCES:
patent: 3428756 (1969-02-01), Epstein
patent: 3934089 (1976-01-01), Stewart
Cooper William C.
Dycon International, Inc.
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