Frequency-independent, self-clocking encoding technique and appa

Details Frequency-independent, self-clocking encoding technique and appa Frequency-independent, self-clocking encoding technique and appa

1981-09-11

1984-10-02

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 56, 375 19, 455608, H04L 2549

Patent

active

044752121

ABSTRACT:
A self-clocking encoding technique for synchronous transmission of digital signals, and apparatus therefor. In an exemplary embodiment, the encoding technique utilizes relatively positive and negative pulses of fixed, predetermined duration. For electrical pulses, the point of reference is preferably a zero baseline. At the leading edge LE.sub.i of the i.sup.th bit cell, the value of the i.sup.th bit is encoded as a positive pulse (e.g., 82A) in the case of a logical "1" or a negative pulse (e.g., 82B) in the case of a logical "0". Further, the next subsequent (i.e., (i+l).sup.th bit has the same value, a pulse (e.g., 82D) of the opposite polarity is injected into the i.sup.th bit cell after the leading edge pulse. Thus, positive and negative pulses alternate and the information content of the encoded signal has no d.c. component; this facilitates a.c. coupling. Further, the encoding technique is bit-rate (i.e., frequency-) independent and usable over a wide range of bit transfer rates. The receiver can synchronously decode the signal if it knows the pulse width; it need not know the sender's transmission rate and indeed, bit transmission rate may even change from one bit cell to the next.
For a fiber optic implementation, a non-zero baseline is used. The optical zero output level replaces the electrical negative pulse level, the half-maximum optical output level replaces the electrical zero level and the maximum optical output level replaces the electrically positive pulse.

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J. Norton, "Drop Your Costs, But Not Your Bits With a Manchester-data Decoder," Electronic Design 15, Jul. 19, 1979 at 110-116.
Taschenbuch Der Nachrichten-Verarbeitung Unter Mitwirkung Zahlreicher Fachleute Herausgegeben Von Dr. Ing K. Steinbuch Springer-Verlag Berlin/Gottingen/Heidelberg, 1962.

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