bar code reader signal processing method and device

Details bar code reader signal processing method and device bar code reader signal processing method and device

1989-11-15

1991-10-22

Trafton, David

Registers

Coded record sensors

Readout control

235437, 235463, G06K 700

Patent

active

050597736

ABSTRACT:
A method of processing a signal in a bar code reader in which an optical signal provided by scanning a bar code is subjected to photo-electric conversion to provide an analog electrical signal, which is utilized to decode the bar code. The method includes scanning a bar code with a light beam whose diameter is small enough to detect thin bars and determining whether the bar code is a thin bar code or a thick bar code. If the bar code is the thick bar code, the reader employs data based upon analog electrical signals, whose frequency components higher than a first cut-off frequency determined for the thick bar code are cut off, as effective data. If the bar code is the thin bar code, the reader employs data based on analog electrical signals, whose frequency components higher than a second cut-off frequency determined for the thin bar code are cut off, as effective data.

REFERENCES:
patent: 4746789 (1988-05-01), Gieles et al.

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