High impedance polarity detector

Details High impedance polarity detector High impedance polarity detector

2005-02-08

2005-02-08

Tieu, Binh (Department: 2643)

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

C379S399010, C379S412000

Reexamination Certificate

active

06853723

ABSTRACT:
A method and apparatus for measuring signals conveyed by a varying polarity voltage signal across a tip and ring in a telephone system is disclosed. A voltage present across the tip and ring is used to charge a charge storage device, and the charge is periodically discharged for a relatively short amount of time. The burst of discharge current for the short amount of time allows an optocoupler to accurately operate, while presenting a very high impedance to the telephone line.

REFERENCES:
patent: 3838223 (1974-09-01), Lee et al.
patent: 3902017 (1975-08-01), Steward
patent: 4063037 (1977-12-01), Heffernan et al.
patent: 4220827 (1980-09-01), Burke et al.
patent: 4447673 (1984-05-01), Elliott et al.
patent: 4528424 (1985-07-01), Middleton et al.
patent: 4852160 (1989-07-01), Kiko et al.
patent: 4993063 (1991-02-01), Kiko
patent: 5086459 (1992-02-01), Perry
patent: 5247573 (1993-09-01), Reichelt
patent: 5511118 (1996-04-01), Gores et al.
patent: 5867560 (1999-02-01), Frankland
patent: 6282271 (2001-08-01), Gutzmer et al.

Affiliated with

Also associated with

Rating

High impedance polarity detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High impedance polarity detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High impedance polarity detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3470700