Filtered transition distortion channel quality monitor

Details Filtered transition distortion channel quality monitor Filtered transition distortion channel quality monitor

1975-12-29

1977-02-01

Robinson, Thomas A.

Telegraphy

Systems

Line-clearing and circuit maintenance

H04L 2506

Patent

active

040063038

ABSTRACT:
A system for measurement of teletype or other communication channel quality herein the bit signal element duration is divided into m subintervals. A plurality of transition counters are provided such that each transition counter counts the number of DC transitions occurring during a different set of said subintervals. The counts are then summed for a predetermined plurality of bits. The monitoring device of the present invention is then calibrated by comparing the sums from each of the plurality of transition counters with a known error reference. The most accurate transition counter is thereby determined and is subsequently used for on-line distortion monitoring.

REFERENCES:
patent: 3025349 (1962-03-01), Peterson
patent: 3036290 (1962-05-01), Zarouni
patent: 3130268 (1964-04-01), Peterson et al.
patent: 3278684 (1966-10-01), Geraghty et al.
patent: 3479458 (1969-11-01), Lord et al.
patent: 3649916 (1972-03-01), Winters
patent: 3715666 (1973-02-01), Mueller et al.

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