Telephone ringing signal generator

Details Telephone ringing signal generator Telephone ringing signal generator

1996-10-17

1998-11-17

Wolinsky, Scott

Telephonic communications

Call signal generating

379252, 379373, 379413, H04M 302, H04M 512

Patent

active

058387889

ABSTRACT:
A telephone ringing signal generator includes a DC converter for producing high positive and negative voltages that define peak amplitudes of the ringing signal, which is produced by low pass filtering a generally trapezoidal waveform having these peak amplitudes. The generally trapezoidal waveform is produced by a level-shifting integrator at a frequency determined by a low voltage square wave supplied to the integrator. The integrator comprises a capacitor coupled between a virtual ground point and an output of the integrator and arranged to be charged with two opposite polarities in response to opposite transitions of the square wave, and a resistor via which the square wave is supplied to the virtual ground point. Buffers are provided for buffering the trapezoidal waveform supplied to, and the ringing signal produced by, the low pass filter.

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