Dialing circuits and methods for electronic telephone sets

Details Dialing circuits and methods for electronic telephone sets Dialing circuits and methods for electronic telephone sets

1980-05-30

1982-04-13

Brigance, Gerald L.

179 90BD, H04M 1274

Patent

active

043249540

ABSTRACT:
A dialing circuit (10) for an electronic telephone set including a microcomputer (40) having an RAM with two or more memory sections (I and II), each capable of storing data signals representing a telephone number. As the numbers are dialed by operation of a conventional pushbutton dial pad (70), the last number dialed (LND) is stored in RAM section I for automatic redial on operation of a redial key included in the dial pad ("LND," FIGS. 1-2; "LND-II" FIG. 3). A mechanism is provided for shifting a first LND from RAM section I to RAM section II, either selectively by operating a Save button (S) in FIGS. 1-2 or automatically on dialing a second number in FIG. 3. An additional key ("S/R," FIGS. 1-2 or "LND-I," FIG. 3) is provided for automatically redialing the first LND from RAM section II. The dialing circuits also include single button (F, P) dialing of a few emergency numbers ("Fire," "Police," "911," etc.). Preferably, the set is powered solely from the central office line current, and a mechanism is provided (C2) for maintaining the validity of the RAM data for an extended period of at least several hours after the set has been placed on hook.

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"MAC-4: A Single-Chip Microcomputer", Proceedings of the IEEE, Compucon, Fall 1979, Wash. D.C., Sep. 4-7, 1979, pp. 13-17, I.C. Eldumiati; et al.
"Index-A Versatile Automatic Dialler", Telesis, 6-1979, Reinhard Rosch.

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