Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1983-07-05
1985-07-09
Griffin, Robert L.
Pulse or digital communications
Spread spectrum
Direct sequence
328165, H04B 110
Patent
active
045286787
ABSTRACT:
A nonlinear noise-blanking circuit with memory. An information signal corrupted by a noise signal is input to the nonlinear noise-blanking circuit. The information signal is blanked during noise impulses and an estimate for the blanked information signal is inserted therein. Various embodiments of the invention disclose means for determining an appropriate estimate. For example, the estimate can be a simple positive or negative dc value corresponding to the sign of the information signal prior to noise corruption. Alternatively the first and second derivatives of the information signal prior to noise corruption can be used to generate an expected future trajectory of the information signal, and this value inserted in the information signal during the blanked interval. Also, a sample and hold circuit can be used to "remember" the value of the information signal prior to the inception of a noise impulse. This "remembered" value is then inserted in the information signal during the blanked interval.
REFERENCES:
patent: 3588705 (1971-06-01), Paine
patent: 3711777 (1973-01-01), Tink
patent: 4419541 (1983-12-01), Kishi et al.
patent: 4479251 (1984-10-01), Dawson
patent: 4479252 (1984-10-01), Souchay et al.
Chin Stephen
Griffin Robert L.
Westinghouse Electric Corp.
Zitelli William E.
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