Device for setting and tone dialing a single telephone number

Details Device for setting and tone dialing a single telephone number Device for setting and tone dialing a single telephone number

1991-02-05

1993-05-11

Brown, Thomas W.

Telephonic communications

Supervisory or control line signaling

Substation originated

379355, 379441, H04M 126

Patent

active

052107906

ABSTRACT:
A device for setting and tone dialing a single telephone number includes a telephone number setting device to generate a digital signal corresponding to the binary equivalent of the digits of the telephone number to be set. A tone generator receives the digital signal generated and groups the digital signal into a predetermined number of bit groups. Each of the bit groups corresponds to one of the digits of the telephone number. The bit groups are accessed one at a time and a dual tone multi-frequency signal corresponding to the digit represented by the accessed bit group is generated by the tone generator and is directed to the telephone instrument.

REFERENCES:
patent: 2945312 (1958-09-01), Book
patent: 3864857 (1975-02-01), Brude
patent: 3943289 (1976-03-01), Sheldon et al.
patent: 3982079 (1976-09-01), Hoehn et al.
patent: 4126768 (1978-11-01), Grenzow
patent: 4219699 (1980-08-01), Nilssen et al.
patent: 4535204 (1985-08-01), Hughes et al.
patent: 4707854 (1987-11-01), Mayer
patent: 4763355 (1988-08-01), Cox
patent: 4817135 (1989-03-01), Winebaum

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