Ringing signal generator

Details Ringing signal generator Ringing signal generator

H - Electricity

04

M

379/16

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

Patent

CA 1206640

ABSTRACT: D.C.-fed ringing signal generator used for a group of subscriber lines (L1)-(Ln). This generator comprises a cascade arrangement of : - a digital signal generator controllable according to the invention by a control signal (CA) to produce a signal corresponding either to the ringing signal or a signal having zero value depending on whether the ring- ing signal or no ringing signal (n') must be produced for the group of subscriber lines, - a digital-to-analog converter, - a capacitively-coupled class-A amplifier, - a direct-coupled class-B symmetrical power amplifier to produce the output signal of the ringing signal gen- arator.

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