Ring trip detector circuit
AssigneeBell Telephone Laboratories, Incorporated
InventorBarry S. Bosik
Life of this patent
Estimating the term…
Abstract
A ring trip detection circuit is disclosed for a remotely generated ringing signal in a subscriber loop carrier system. The ring trip detection circuit is enabled only during the high voltage half-cycle of the ringing signal to increase ring trip detection sensitivity and reduce the size and complexity of the ring trip detection circuit.
Claims6
A ring trip detection circuit for subscriber loop carrier systems wherein the ringing signal source provides one half-cycle of the ringing signal which is of a substantially higher voltage than the other half-cycle, said detection circuit
- characterized by
- a voltage detector for detecting an off-hook condition in a telephone subscriber station set, and
- means for enabling said voltage detector only during said half-cycle having said substantially higher voltage.
A voltage detection circuit for intermittently applied voltages
- characterized by
- means for detecting said voltages, and
- means for enabling said voltage detection means only during those periods in which a nonzero portion of said intermittent voltage is being applied.
Dependencies are inferred from the claim text.