Digital tone ringer

Details Digital tone ringer Digital tone ringer

H - Electricity

04

M

379/12

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

Patent

CA 1162337

ABSTRACT A digital telephone ringer for use in telephone sets for operation on call signals coming both from electro- mechanical and electronic exchanges, that recognizes a call signal by means of a series of amplitude, frequency and duration checks such as to exclude noise signals, frequency checks by independent circuits determining whether a call signal originates from an electronic or electromechanical exchange, and generates a desired ringing tone.

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