Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1984-12-21
1986-08-26
Ng, Jin F.
Pulse or digital communications
Spread spectrum
Direct sequence
375 87, 375118, 328 63, H04L 702
Patent
active
046087028
ABSTRACT:
A method for rapidly recovering the clock from Manchester-encoded signals using simple digital techniques is provided for use in an inexpensive Manchester-encoding receiver. The received Manchester-encoded signal is monitored to determine zero-voltage crossing. At each such crossing the frequency of the recovered clock is adjusted by comparing the occurrence of the zero-crossing with respect to the midpoint of the period of the presently-generated recovered clock. Shorten, center or lengthen adjustment signals are generated as a result of this comparison which are used to shorten or lengthen, by 1/16 increments of the inter-bit period of the received data signal, the period of the next-generated recovered-clock. The method is readily implemented as a sixteen-stage programmable counter providing a phase-locked loop.
REFERENCES:
patent: 3778550 (1973-12-01), David et al.
patent: 4385396 (1983-05-01), Norton
Hirzel Frederic J.
Levy Roy J.
Advanced Micro Devices , Inc.
Huseman M.
King Patrick T.
Ng Jin F.
Salomon Kenneth B.
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