Signal processor method and apparatus

Details Signal processor method and apparatus Signal processor method and apparatus

1975-03-21

1976-12-28

Cook, Daryl W.

Registers

Calculators

Input-output calculator to indicator, printer, etc.

250568, G06K 710, G08C 906

Patent

active

040003973

ABSTRACT:
Method and apparatus for processing input binary encoded analog signals to precisely determine the time occurrence of positive-going and negative-going transitions. Such digital signals result, for example, when bar codes (e.g. Universal Product Codes) are optically scanned. Transitions are determined by detecting the zero crossings, at selected gating times, of the second derivative of the input signals. The selected gating times occur whenever the first derivatives of the input signals exceed a threshold level. The threshold level is determined in one embodiment by peak-to-peak detecting the input signals and adding this value to a rectified noise measurement signal.

REFERENCES:
patent: 3304542 (1967-02-01), Sutton
patent: 3653029 (1972-03-01), Kuhlmann
patent: 3700858 (1972-10-01), Murthy
patent: 3716699 (1973-02-01), Eckert
patent: 3723710 (1973-03-01), Crouse
patent: 3849632 (1974-11-01), Eckert
patent: 3860794 (1975-01-01), Knockeart
patent: 3892949 (1975-07-01), Dodson

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