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

H - Electricity

04

M

379/16

H04M 3/02 (2006.01) H04M 1/665 (2006.01) H04M 19/04 (2006.01)

Patent

CA 1213992

- 18 - METHOD AND CIRCUITRY FOR ENCODING TELEPHONE RINGING SIGNALS 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.

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