NRZ digital data recovery

Details NRZ digital data recovery NRZ digital data recovery

1983-12-23

1986-05-27

Olms, Douglas W.

Pulse or digital communications

Spread spectrum

Direct sequence

375120, H04L 702, H03D 324

Patent

active

045920770

ABSTRACT:
The clock signal required for demodulation of a received NRZ digital data stream is generated by detecting each transition across a reference axis made by the received NRZ digital data stream. This transition data is then utilized to change the voltage applied to a voltage controlled oscillator. The change in the voltage applied to the voltage controlled oscillator causes the frequency of the output from the voltage controlled oscillator to change. The change in the frequency of the output of the voltage controlled oscillator adjusts the period of the clock signal until the clock signal is synchronized with the transition data at which time it may be used to demodulate the recieved NRZ digital data.

REFERENCES:
patent: 4321483 (1982-03-01), Dugan
patent: 4371975 (1983-02-01), Dugan
patent: 4380815 (1983-04-01), Clendening
patent: 4385396 (1983-05-01), Norton

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