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

379/12

H04M 3/02 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1202739

- 15 - METHOD AND CIRCUITRY FOR ENCODING TELEPHONE RINGING SIGNALS Abstract The disclosed apparatus encodes telephone ringing to identify both the origin and destination of a received call. The ring envelope of the ringing signal is divided into two segments. During the first segment, call origin information is encoded by varying the number of pulses or the pulse widths of a fixed frequency signal. Call destination information is encoded by time division multiplexing different frequencies into subsegments of the second segment. (Fig. 1).

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