Method and apparatus for sequencing two digital signals

Details Method and apparatus for sequencing two digital signals Method and apparatus for sequencing two digital signals

1979-04-10

1981-02-24

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

375 55, H04L 2718, H04L 702

Patent

active

042531870

ABSTRACT:
A first self-timing signal bi-phase-mark coded and having a data portion and a synchronization portion is to be sequenced by a second signal also having a data and a synchronization portion. The signals derived by differentiating only the level change at the end of each bit cell phase-lock an oscillator whose output provides the basic timing for a modulator stage. In the modulator stage, a flip-flop first changes state under control of the first signal. At the start of the synchronization portion of the first signal, a comparator furnishes a signal which switches control of the flip-flop to signals derived from differentiation of the second signal. When the second signal is binary coded, a NAND gate modulates the pulses from the second signal by pulses resulting from differentiating negative going edges of the signal derived from the phase-locked oscillator to create a signal for controlling the flip-flop so that it changes state in accordance with a bi-phase-mark code.

REFERENCES:
patent: 3417332 (1968-12-01), Webb
patent: 3458835 (1969-07-01), Saeger
patent: 4127878 (1978-11-01), Johnson, Jr.
patent: 4143407 (1979-03-01), Liberty
"Journal of the Society of Motion Picture and Television Engineers", Jun. 1973, vol. 82, pp. 482-491.
European Broadcast Union Document Tech. 3097.

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