Ringing circuit for telephone subset, designed as an integrated

Details Ringing circuit for telephone subset, designed as an integrated Ringing circuit for telephone subset, designed as an integrated

1983-08-16

1985-01-29

Rubinson, Gene Z.

179 84R, H04M 100

Patent

active

044967985

ABSTRACT:
This ringing circuit detects the presence of the ringing signal on the subscriber line by means of a first circuit for detecting transition of the same direction in the ringing signal and of a second time measuring circuit for defining a validity window for the occurrence of a transition of desired direction and for providing a ringing control signal when the ringing signal is recognized. The ringing circuit is supplied by rectified AC ringing signals wherein a sufficient-voltage detection circuit is provided to authorized the operation of the ringing circuit.

REFERENCES:
patent: 4066848 (1978-01-01), Darwood

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