Augmented phase-locked loop for very wide range acquisition and

Details Augmented phase-locked loop for very wide range acquisition and Augmented phase-locked loop for very wide range acquisition and

1982-01-29

1983-12-06

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

328155, 329122, H03B 306

Patent

active

044197608

ABSTRACT:
An augmented phase-locked loop for use with a data communication system in which the data is encoded into a plurality of symbol signals such that the channel on which transmission occurs is switched at a data clock rate between symbol signals and such that two like symbol signals cannot appear successively. The coincidental transitions between symbol signals are detected and are used to lock a phase-locked loop. If the integrated signal from a transition detector is greater than integration of the signal level of the pluses on each incoming channel at the frequency of the loop locking to a subharmonic is detected and causes a sweep circuit to drive an oscillator to sweep until the phase-locked loop locks on the correct data clock frequency. The frequency to which the loop is locked is used to clock a successive sampling of each input so that if the loop is locked on a harmonic of the correct data clock, the sequential repetition of a symbol signal on a channel is detected and is used to force an oscillator to sweep until the phase-locked loop is locked to the correct data clock frequency.

REFERENCES:
patent: 3908115 (1975-09-01), Waggener
patent: 4085288 (1978-04-01), Viswanathan
patent: 4320345 (1982-03-01), Waggener
patent: 4320527 (1982-03-01), Takasaki

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