Telephonic communications – Supervisory or control line signaling – Substation originated
Patent
1990-08-23
1992-07-14
Dwyer, James L.
Telephonic communications
Supervisory or control line signaling
Substation originated
379 58, 379 68, H04M 164
Patent
active
051310295
ABSTRACT:
A cellular telephone dialing controller comprising an operator switch, a state machine, digitally stored audio prompts, and a Dual Tone Multi-Frequency signal generator, in which at each dialing step the operator hears sequentially the numerals zero, one, etc. and the operator "dials" by closing the operator's switch when the proper number is played. At completion of "dialing" the entire phone number is audibly replayed for operator approval, after which the call is automatically initiated, including the generation of Dual Tone Multi-Frequency as well as Off-Hook/On-Hook control signals, the entire dialing operation being completed without visual participation or use of the operator's hands, thereby ensuring driving safety.
REFERENCES:
patent: 4517413 (1985-05-01), Pavitt, Jr.
patent: 4658097 (1987-04-01), D'Agosto, III et al.
patent: 4731811 (1988-03-01), Dubus
patent: 4908845 (1990-03-01), Little
patent: 5048074 (1991-09-01), Dugdale
Dwyer James L.
Shehata M.
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