Apparatus for pulsing in telephone sets

Details Apparatus for pulsing in telephone sets Apparatus for pulsing in telephone sets

1975-03-12

1976-09-14

Claffy, Kathleen H.

H04M 1272

Patent

active

039808378

ABSTRACT:
In a push button operated telephone set to be used in a telephone system designed for break/make impulsing an electronic circuit is used for converting the push button signals to break/make pulse trains. In order to supply power to the electronic circuit from the central battery through the subscriber's line even if the terminal voltage is low at the subscriber, a DC voltage converter is used in the set to multiply the terminal voltage. This converter includes a pulse oscillator which is also used as a timing pulse generator for the electronic circuit, controlling the frequency, make/break ratio and pulse sequence intervals of the dial pulse trains sent to the exchange.

REFERENCES:
patent: 3538256 (1970-11-01), Lucas
patent: 3787639 (1974-01-01), Battrick
patent: 3856982 (1974-12-01), Lawson et al.
patent: 3881070 (1975-04-01), McCabe et al.

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