Switching signal generator

Details Switching signal generator Switching signal generator

1976-12-16

1978-07-25

Claffy, Kathleen H.

179 84VF, 325 55, H04H 104, H04M 160, H04B 100

Patent

active

041031059

ABSTRACT:
In a press-to-talk system of radio telephone communication, the operator's particular voice signal actuates a switching signal generator to generate a transmit-receive circuit changing signal which connects the circuit of the radio telephone equipment for transmission or for standby. A characteristic tone signal is also generated for each switching changeover of the radio equipment to inform the operator of the switching changeover of the equipment. The press-to-talk manual switch and the pilot lamp for indicating the state of the circuit connection are eliminated, and the operator can use his hands and eyes for other operations while he is using his radio telephone equipment. A feature of the invention is the use of two different frequency tones to indicate equipment mode or logic status by indicating the direction of logic-state change.

REFERENCES:
patent: 3358234 (1967-12-01), Stover
patent: 3377435 (1968-04-01), Lippert
patent: 3400392 (1968-09-01), Willcox
patent: 3610833 (1971-10-01), Lebegue
patent: 3714575 (1973-01-01), Rognlski
patent: 3875337 (1975-04-01), Bradley
R. Hamilton, "Tone Encoder and Pocket Pager", IBM Tech. Discl. Bull., Jun. 1972.

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