Detecting make-break clicks on a telephone line

Details Detecting make-break clicks on a telephone line Detecting make-break clicks on a telephone line

1993-03-01

1995-06-27

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of trunk or long line

379 26, 379377, 379386, H04M 124, H04M 300

Patent

active

054286620

ABSTRACT:
Method and apparatus for detecting make-break clicks on a telephone line, i.e., clicks produced by going on-hook or off-hook. A click is detected by analyzing time slices of a telephone signal to detect a sharp positive transition in signal energy followed by a diminishing envelope of short duration. Three signal measures are utilized to determine whether a click has occurred: (a) a magnitude transition, i.e., a change of the magnitude of the amplitude of the signal over a short period of time; (b) a peak magnitude, i.e., a magnitude of the amplitude of the signal corresponding to the first acceptably large magnitude transition (the beginning of the click); and (c) a duration of the signal envelope. In accordance with the present invention: (a) the minimum allowable peak magnitude of a valid click is scaled to the maximum magnitude encountered as the telephone signal is analyzed, i.e., a start-of-click adaptive amplitude measure, and (b) the end of the click is determined by comparing the magnitude of the amplitude of the signal with a maximum allowable magnitude for silence which is scaled to the maximum magnitude encountered since the last click ended, i.e., an end-of-click adaptive amplitude measure.

REFERENCES:
patent: 4122308 (1978-10-01), Weinberger
patent: 4405833 (1983-09-01), Cave
patent: 4839920 (1989-06-01), Held-Elbert
patent: 4924501 (1990-05-01), Cheeseman
patent: 4944001 (1990-07-01), Kizuik
patent: 5251256 (1993-10-01), Crowe

Affiliated with

Also associated with

Rating

Detecting make-break clicks on a telephone line does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Detecting make-break clicks on a telephone line, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detecting make-break clicks on a telephone line will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-293117