Telephone ringing detector

Details Telephone ringing detector Telephone ringing detector

H - Electricity

04

M

379/12

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

Patent

CA 2005260

TELEPHONE RINGING DETECTOR Abstract To accurately detect the short bursts of distinctive ringing signals within 100 milliseconds, a magnitude comparator produces a binary signal indicative of whether the instanuneous tip-ring voltage exceeds a predetermined magnitude. The binary signal is integrated over a predetermined period of time controlled by a timer. If the time integral is below a first predetermined value, the absence of ringing is detected; if above a second predetermined value, ringing is detected; if in between, the integrating interval is extended until the integral falls outside the two values.

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