Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1982-08-26
1985-01-08
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
307511, 328 74, 328155, H03K 5135
Patent
active
044930941
ABSTRACT:
A programmable oscillation counter (10) is initially synchronized by presetting the counter to a predetermined correct phase condition by applying thereto a single digital signal set representing the magnitude of the phase correction to be applied. Subsequent tracking of the correct phase condition is accomplished by utilizing additional two's-complement digital signal sets from time to time to preset an incremental counter (11) to a level which indicates the extent of phase error. The latter counter is controlled to reduce the error by altering the phase of the oscillation counter operation by one step at a time each time the oscillation counter cycles through a predetermined phase of its operation and until the incremental counter has counted down its preset phase error magnitude to zero.
REFERENCES:
patent: 3668315 (1972-06-01), Heitzman
patent: 3697689 (1972-10-01), Gibson
patent: 3983497 (1976-09-01), Hegeler
patent: 4206414 (1980-06-01), Chapman
patent: 4216544 (1980-08-01), Boleda et al.
patent: 4302831 (1981-11-01), Zemanek
patent: 4340863 (1982-07-01), Scordo
patent: 4415933 (1983-11-01), Murayama et al.
patent: 4423520 (1983-12-01), Murayama et al.
AT&T Bell Laboratories
Phelan C. S.
Safourek Benedict V.
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