Remote hang-up detector

Details Remote hang-up detector Remote hang-up detector

1996-05-24

1999-02-02

Hunter, Daniel S.

Telephonic communications

Audio message storage, retrieval, or synthesis

Dynamic audio signal recording or reproduction

379 9328, 379379, 379385, 379382, 379386, H04N 100

Patent

active

058675604

ABSTRACT:
A communications detector for detecting remote user hang-up or disconnection by a telephone answering machine (TAM). The remote hang-up detector (RHUD) may operate in conjunction with a modem and does not affect transmission and receipt of modem signals and modem performance. An optically isolated voltage detector indicates to the TAM that the remote user has hung up by detecting reversal or interruption of the loop current supplied by the central office, thereby causing the local user or modem to likewise hang up.

REFERENCES:
patent: 2883461 (1959-04-01), Cain
patent: 4203006 (1980-05-01), Mascia
patent: 4737986 (1988-04-01), Tsunoda
patent: 5105461 (1992-04-01), Tsurusaki et al.
patent: 5521975 (1996-05-01), Hashimoto
patent: 5535265 (1996-07-01), Suwandhaputra
patent: 5600715 (1997-02-01), Bingel
patent: 5631745 (1997-05-01), Wong et al.

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