Electronic circuit for detecting the lifting of a telephone...

Details Electronic circuit for detecting the lifting of a telephone... Electronic circuit for detecting the lifting of a telephone...

H - Electricity

04

M

379/67

H04M 7/00 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1194627

ABSTRACT An electronic circuit for detecting the lifting of a telephone handset in the presence of ringing current, which is capable of detecting small variations of the d.c. current flowing through the line loop in the presence of high a.c. current. The circuit carries out the multipli- cation of the line current by a constant value and by a pulse signal with suitable frequency and pulse duration, it integrates the current over one or more periods of the ringing signal and compares it with predetermined thresholds. The circuit allows the use of a single low value capacitor and is easy to integrate.

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