Method and circuitry for encoding telephone ringing signals

Details Method and circuitry for encoding telephone ringing signals Method and circuitry for encoding telephone ringing signals

1983-02-28

1985-04-02

Rubinson, Gene Z.

179 84R, 179 84VF, 179 84SS, H04M 100

Patent

active

045089370

ABSTRACT:
In the disclosed coded telephone ringing signal method and circuitry, audibly distinguishable ringing codes are generated by alternately shifting between at least a pair of single frequency tones at different modulation rates. Other distinguishable ringing codes are generated by changing both the modulation rates and tone frequencies utilized.

REFERENCES:
patent: 3740490 (1973-06-01), McAlonie et al.
patent: 3867585 (1975-02-01), Morstadt
patent: 4081617 (1978-03-01), Clark
patent: 4193257 (1980-03-01), Watkins
patent: 4276448 (1981-06-01), Embree et al.
patent: 4309574 (1982-01-01), Sublette et al.
Chapman et al., "Melodic Telephone Ringer", Popular Electronics, Nov. 1981, pp. 57-59.

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