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

1982-11-22

1984-10-16

Schreyer, Stafford D.

179 84SS, 179 84VF, 179 17E, H04M 1300

Patent

active

044776977

ABSTRACT:
The method and 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.

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patent: 4330780 (1982-05-01), Masaki

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