Telephonic communications – Call or terminal access alarm or control – Fraud or improper use mitigating or indication
Patent
1994-11-08
1996-07-23
Hofsass, Jeffery
Telephonic communications
Call or terminal access alarm or control
Fraud or improper use mitigating or indication
379199, 379386, H04M 320, H04M 166
Patent
active
055398120
ABSTRACT:
Methods and apparatus for use in connection with a telecommunication between a local telephone and a remote telephone, which are capable of detecting whether one of the parties to the communication has attempted to initiate a three-way, i.e., conference, call by using a hook-flash signal. The apparatus includes a low pass filter for passing energy having frequencies below about 500 Hz, and an energy detector for detecting a specific electrical energy pulse characteristic of the hook-flash having passed through the low pass filter. The existence of the hook-flash is confirmed by digital signal processing equipment which identifies a rapid drop-off in energy also characteristic of the hook-flash signal. Optionally, the hook-flash may be further confirmed by including software for cooperating with the energy detector to ascertain whether sound has occurred in the telecommunication during a predetermined period following the first hook-flash signal.
REFERENCES:
patent: 3626107 (1971-12-01), Armstrong et al.
patent: 3660610 (1972-05-01), Hestad et al.
patent: 4387274 (1983-06-01), Stein et al.
patent: 5283825 (1994-02-01), Druckman et al.
patent: 5319702 (1994-06-01), Kitchin et al.
Johnson John C.
Kitchin Dwight W.
Schott Alan K.
Smith Clive L.
Hofsass Jeffery
Hunter Daniel S.
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