Method and apparatus for reading label bar codes

A method and apparatus for reading label bar codes in which a photoelectric signal representative of an optically scanned bar code label is differentiated. The positive and negative peaks of the differentiated signal are detected, and the time intervals between the peaks are measured by counter mean...

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Bibliographic Details
Main Authors TOKURA; NOBUFUMI, SUZUKI; KAZUHIRO, NAKANISHI; SADAO, ENDO; SHINICHIRO
Format Patent
LanguageEnglish
Published 19.06.1979
Subjects
CALCULATING
COMPUTING
COUNTING
HANDLING RECORD CARRIERS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Summary:A method and apparatus for reading label bar codes in which a photoelectric signal representative of an optically scanned bar code label is differentiated. The positive and negative peaks of the differentiated signal are detected, and the time intervals between the peaks are measured by counter means to produce output signals representative of the bar code label. A multi-level threshold comparison technique is used to detect and predict the occurrence of positive and negative peaks.
Bibliography:Application Number: US19780895032