Excavating
Patent
1980-04-08
1983-02-22
Malzahn, David H.
Excavating
G06F 1130
Patent
active
043750990
ABSTRACT:
A link performance indicator card analyzes incoming analog data from a demodulator on a bit by bit basis and compares the individual bit amplitudes with a fraction of the average bit signal levels. The data bits that lack sufficient amplitude to be clear-cut "high" or "low" pulses are detected as "pseudo-errors". A bit error rate gate signal controls the detectors in order that circuits operate for only one burst or part of a burst per frame always from the same earth station. A comparator is used for comparing the output of the averaged incoming analog signal with the instantaneous value of the analog signal. Alternate clocking signals are used to perform the averaging function and the comparison function of the average signal with the instantaneous signal. This alternation of the signals frees the comparison operation from the influence of any loading on the circuit. The sample points of the incoming analog signal are adjustable by use of delays on the clock signals fed into the circuits.
REFERENCES:
patent: 3214700 (1965-10-01), Hook
patent: 3568150 (1971-03-01), Games
patent: 3638183 (1972-01-01), Progler et al.
patent: 3721959 (1973-03-01), George
patent: 4034340 (1977-07-01), Sant'Agostino
patent: 4234954 (1980-11-01), Lange et al.
Luntz Michael B.
Waters George W.
Harris Corporation
Malzahn David H.
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