Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1988-10-11
1989-08-08
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
307511, 328 63, H04L 702
Patent
active
048560294
ABSTRACT:
Apparatus for effecting the technique includes a subtraction circuit for producing a difference signal by subtracting successive words of the serial bit stream forming the digital signal. A comparator circuit compares the difference signal to a predetermined maximum slew rate limit signals. If the difference signal is greater than the maximum limit signal, then subtraction and comparison is repeated, after shifting the successive words of the digital signal by one bit. This process is repeated until, when the difference no longer exceeds S, synchronization is assumed.
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The Art of Electronics, Horowitz and Hill, Cambridge University Press, Cambridge 1980, p. 477.
Calaway Ward M.
Geyer Daniel J.
Chin Stephen
Eastman Kodak Company
Noval William F.
Safourek Benedict V.
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