Ringing signal generator for use in a subscriber's...

Details Ringing signal generator for use in a subscriber's... Ringing signal generator for use in a subscriber's...

H - Electricity

04

M

379/17

H04M 3/06 (2006.01)

Patent

CA 1098631

PHF 77-517 ABSTRACT: Ringing signal generator for generating a ring- ing current in a subscriber's connecting element and comprising a line current inverter. This inverter is controlled by means of a signal having two levels obtained by encoding a sinusoidal ringing signal by means of delta modulation at a sampling frequency which considerably exceeds the frequency of the ringing current. Use: elec- tronic devices in telephone exchanges.

298320

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