Universal self-clocking code reading method and apparatus

Details Universal self-clocking code reading method and apparatus Universal self-clocking code reading method and apparatus

1975-10-29

1976-08-31

Cook, Daryl W.

Registers

Calculators

Input-output calculator to indicator, printer, etc.

250555, G06K 710, G08C 906

Patent

active

039783197

ABSTRACT:
A general method for reading or decoding the self-clocking encoded data content of digital data bits, which may be recorded on magnetic or optical media or received on a communication channel in an encoded electrical signal form, is described. The method is useful for decoding all self-clocking codes where signals in the form of optic, magnetic, or electric signal variations are presented to a decoding apparatus for the extraction of data content therefrom. The technique utilizes a standard reference length, or alternatively, a set of transitions placed outside of each series of coded data bits or characters to provide a reference length, and then predicts, for the known type of code format, each possible location for each next valid data pulse or signal transition. Search gates segmenting the search time are erected about the predicted valid locations for the pulses for the next data bit and, depending upon in which gate or search window each pulse is found, the data content of that bit cell is defined in accordance with a logical table or matrix of values corresponding to the code format being utilized.

REFERENCES:
patent: 3761685 (1973-09-01), Alpert et al.
patent: 3784792 (1974-01-01), Dobras
patent: 3838251 (1974-09-01), Herrin
patent: 3882464 (1975-05-01), Zamkow
patent: 3947662 (1976-03-01), Vinal

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