Time limited telephone paging employs a relay switch actuated by

Details Time limited telephone paging employs a relay switch actuated by Time limited telephone paging employs a relay switch actuated by

1976-04-02

1977-06-21

Stellar, George G.

H04M 1102

Patent

active

040313298

ABSTRACT:
There is disclosed an arrangement to enable control of a function at a remote location from a local location employing two audio control signals (tones) each having a different frequency. A short burst of the two tones are injected into a telephone line at the local location. These two tones when detected simultaneously at the remote location provides an output signal from logic circuitry. This output signal triggers a timer whose output controls the function for a given period of time.

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IBM Technical Disclosure Bulletin, vol. 13, No. 9, Feb. 1971, pp. 2550-2551, "Switch Shaper," G. J. Laurer.
Radio Electronics, Nov. 1974, pp. 54 & 55 from "40 Projects Using Cosmos Digital IC's," R. M. Marston.
QST, July 1971, pp. 34-35.

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