Method and apparatus for encoding data and clock information in

Details Method and apparatus for encoding data and clock information in Method and apparatus for encoding data and clock information in

1975-03-05

1976-06-29

Safourek, Benedict V.

Telegraphy

Systems

Line-clearing and circuit maintenance

325 38R, 340347DD, H04L 700

Patent

active

039670627

ABSTRACT:
A method and apparatus is described for generating a data stream incorporating a self-clocking Manchester type code. The data, originally stored in a shift register, is shifted out of the register in bi-level form with a first voltage level representing one binary value and a second voltage level representing a second binary value. The output voltage levels from the shift register are applied simultaneously to two AND gates with an inverter interposed between the shift register and one of the AND gates. Two clock pulse trains are utilized, one having a clock rate twice the clock rate of the other. The clock pulses are respectively applied to the AND gates, the outputs of which are OR'ed and applied to a flip-flop. The output pulses from the OR-gate clocks the flip-flop which toggles to provide a suitably encoded self-clocking data stream at the true and the not true outputs thereof. The output from the flip-flop is applied to a line driver for driving a transmission cable that may be of the twin co-axial type.

REFERENCES:
patent: 3629505 (1971-12-01), Zegers

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