Ringing signal generator for use in a subscriber's line circuit

Details Ringing signal generator for use in a subscriber's line circuit Ringing signal generator for use in a subscriber's line circuit

1978-02-17

1979-11-13

Claffy, Kathleen H.

179 84R, H04M 304

Patent

active

041744675

ABSTRACT:
A ringing signal generator for generating a ringing current in a subscriber's line uses a line current inverter controlled by means of a pulse code modulated signal obtained by encoding a sinusoidal ringing signal by means of a delta modulator at a sampling frequency which considerably exceeds the frequency of the ringing current.

REFERENCES:
patent: 3723662 (1973-03-01), Macrander

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