Discrete ringing detector for use in key telephone systems

Details Discrete ringing detector for use in key telephone systems Discrete ringing detector for use in key telephone systems

1975-01-17

1976-03-23

Robinson, Thomas A.

179 84R, H04M 100

Patent

active

039461467

ABSTRACT:
A circuit for use with key telephone systems for detecting the presence of either of two different distinctive ringing signals received over a telephone line. After detection a separate distinct visual signal is provided to indicate which of the two signals was received.

REFERENCES:
patent: 2187499 (1940-01-01), Langer et al.
patent: 2753403 (1956-07-01), Caracciolo
patent: 3176082 (1965-03-01), Nilsson
patent: 3653018 (1972-03-01), Budrys
patent: 3816670 (1974-06-01), Marshall

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