Patent
1977-11-07
1979-03-27
Claffy, Kathleen H.
H04M 342
Patent
active
041467515
ABSTRACT:
A solid state pulsing circuit and an adapter connector for pulsing the counting and register advance terminals of the L-(line) relay of an originating register in accordance with the digit nature of received DTMF signals is disclosed. The pulsing circuit includes a pair of solid state switches adapted to be alternatively actuated and the adapter connector connects the pulsing circuit to the counting and register advance terminals of the line relay without affecting the normal operation of the relay. Complementary MAKE and BREAK signals derived from the serial pulse output of a DTMF receiver operate the solid state pulsing circuit such that the pulsing circuit alternately pulses (opens and grounds) the counting and register advance terminals of the line relay in accordance with the production of pulses by the DTMF receiver. Other relay terminals (i.e., the terminals controlling the slow release supervisory relay adapted to detect the ON HOOK state of a subscriber's telephone) are not pulsed, whereby annoying line clicks are avoided.
REFERENCES:
patent: 2875278 (1959-02-01), Lueders
patent: 3453391 (1969-07-01), Hubbell
patent: 3818144 (1974-06-01), Druyff et al.
patent: 4093826 (1978-06-01), Koster
Claffy Kathleen H.
Myers Randall P.
Tel-Tone Corporation
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