Universal telephony interface polarity detector

Details Universal telephony interface polarity detector Universal telephony interface polarity detector

2007-01-09

2007-01-09

Tran, Sinh (Department: 2615)

Telephonic communications

Subscriber line or transmission line interface

C379S377000

Reexamination Certificate

active

09996255

ABSTRACT:
A method and apparatus for measuring signals conveyed by a varying the voltage polarity across the tip and ring terminals in a telephone system is disclosed. The invention provides a composite circuit including a first stage in the form of a differential amplifier, a second stage in the form of a low pass filter, and a third stage in the form of a Schmidt trigger. The invention is capable of discerning an intentional polarity reversal telephony signal by eliminating transmission noise, as well as false triggering due to a high frequency (relative to a defined threshold) ring signal.

REFERENCES:
patent: 4540853 (1985-09-01), Albouy
patent: 5987120 (1999-11-01), Hwang et al.
patent: 6590973 (2003-07-01), Bijman et al.

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