Synthesizer of multifrequency code signals

Details Synthesizer of multifrequency code signals Synthesizer of multifrequency code signals

1975-09-29

1977-04-12

Claffy, Kathleen H.

179 90K, H04Q 912

Patent

active

040176932

ABSTRACT:
The invention relates to a synthesizer of multifrequency code signals for a keyboard type telephone station, more particularly to a generator producing dialing signals or more generally recorder signals embodied by frequencies associated 2 by 2 in a 2-amongst-N code to represent decimal-notation digits and, if necessary, other signal-service signals. A dialing code of such a kind can be e.g. the SOCOTEL multifrequency code recommended by the CCITT.

REFERENCES:
patent: 3601552 (1971-08-01), Barnaby
patent: 3787639 (1974-01-01), Battrick
patent: 3787836 (1974-01-01), Hagelbarger
patent: 3824484 (1974-07-01), Gillette

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