Digital data signalling systems and apparatus therefor

Details Digital data signalling systems and apparatus therefor Digital data signalling systems and apparatus therefor

1974-10-16

1976-04-27

Griffin, Robert L.

Telegraphy

Systems

Chemical

178 88, 325 38R, 325322, 340347DD, H03K 1324, H04L 2500

Patent

active

039536734

ABSTRACT:
A data signalling system in which binary `0` is transmitted as `01` and binary `1` is transmitted alternately as `00` or `11`. This code gives good timing information for use at the receiving terminal of the system regardless of the data actually being signalled. Negative transitions of the transmitted waveform (i.e. from `1` to `0`) occur only at the ends of data bits periods and such transitions are utilised at the receiving terminal to synchronise a clock pulse generator which controls the operation of decoding apparatus at that terminal.

REFERENCES:
patent: 3369181 (1968-02-01), Braymer
patent: 3400369 (1968-09-01), Cooper
patent: 3810111 (1974-05-01), Patel

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