Method for electrically simulating a cradle switch and a hands f

Details Method for electrically simulating a cradle switch and a hands f Method for electrically simulating a cradle switch and a hands f

1987-03-13

1988-12-06

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379387, 379396, H04M 102

Patent

active

047900067

ABSTRACT:
A method for electronically simulating a cradle switch and a hands free talking-loudspeaking key in a telephone station. The cradle switch and hands free talking-loudspeaking key must be functionally coupled to one another in such a telephone station. This is generally effected mechanically. Structural difficulties and an operator-unfriendly arrangement of the key have thus resulted. To solve these problems, a control pulse generator is provided which, by an appropriate emission of control pulses following the actuation of the key and/or the cradle switch, triggers the individual functions in the participating assemblies of the telephone station. In the rest state, the control pulse generator and a dialing store of the keyboard are maintained on standby by a weak, line-fed standby current supply. The method is suitable for all hands free talking-loudspeaking telephone stations.

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patent: 4647787 (1987-03-01), Pommer, II
patent: 4661977 (1987-04-01), Howett
patent: 4675902 (1987-06-01), Boeckmann

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