Method and apparatus for recovering data and clock information i

Details Method and apparatus for recovering data and clock information i Method and apparatus for recovering data and clock information i

1975-03-05

1976-06-29

Safourek, Benedict V.

Telegraphy

Systems

Line-clearing and circuit maintenance

178 88, 325 38R, 340347DD, H04L 700

Patent

active

039670619

ABSTRACT:
A method and apparatus is described for receiving a data stream incorporating a self-clocking Manchester code. The data stream is applied to monostable multivibrators which produce pulses at each positive-going and negative-going transition in the voltage level of the data stream. Output pulses from the monostable multivibrators are applied to a third monostable multivibrator which is responsive to only the positive-going pulses applied thereto; the third multivibrator produces an output pulse having a period greater than one-half the bit period, but less than the whole bit period, of the data stream. The positive-going voltage transition of the output of the third multivibrator is used to trigger a clock pulse which is applied to a pair of gates. The gates enable a pair of latches to which the data stream is applied to recover data from the stream and apply the data to a shift register.

REFERENCES:
patent: 3659286 (1972-04-01), Perkins et al.
patent: 3820031 (1974-06-01), Smithlin

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