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How to input the bar code on the supermarket goods into the computer?
Supermarkets generally use bar code guns to input information into computers.

Bar code gun is a hand-held bar code reader, which consists of light source, receiving device, photoelectric conversion part, decoding circuit, computer interface and so on.

The light emit by that light source shines on the bar code symbol through the optical system, and is image on a photoelectric converter after being reflect, so as to generate an electrical signal, which is amplified, filtered and shaped by a decoder and converted into a digital signal acceptable to a computer.