Data separator with noise-tolerant adaptive threshold

Details Data separator with noise-tolerant adaptive threshold Data separator with noise-tolerant adaptive threshold

1990-10-31

1992-08-25

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

307358, 307362, H04L 2506

Patent

active

051425548

ABSTRACT:
A comparator-based digital data separator is modified to operate in noisy signal environments, with signals characterized by extreme duty cycle. A demodulated binary signal is passed through a pair of diodes which produce a slack voltage. The signal is then passed through an RC low-pass filter, and is finally connected to an input of the comparator as the reference voltage. The low-pass filter, which provides the D.C. averaged voltage to the threshold comparator, receives current into its own input only when the demodulated signal excursions exceed the existing threshold voltage by more than the slack voltage. Consequently, assuming there exists a sufficiently large recovered signal, the voltage being used as the decision threshold will remain separated from the recovered signal excursion peaks by at least the amount of slack voltage. In so doing, the binary data separation is given improved noise immunity and reduced sensitivity to duty cycle variations.

REFERENCES:
patent: 3679989 (1972-07-01), Thibodeau
patent: 4029904 (1977-06-01), Papeschi
patent: 4175256 (1979-11-01), Dolikian
patent: 4339727 (1982-07-01), Kage et al.

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