Bar-code reading apparatus

Details Bar-code reading apparatus Bar-code reading apparatus

1988-04-26

1989-05-23

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235474, G06H 710

Patent

active

048333093

ABSTRACT:
Disclosed is a bar-code reading apparatus including a peak hold circuit for converting an analog signal which is obtained by reading a bar code into a digital signal, wherein the peak hold circuit generates an original signal corresponding to the analog signal, a first comparison signal, the peak value of which is compared with the original signal to determine a changing point from black to white, and a second comparison signal, the peak value of which is compared with the original signal to determine a changing point from white to black, and the peak hold circuit independently shifts levels of the first and second comparison signals with respect to the original signal, thereby eliminating noise components which are included in the bar code.

REFERENCES:
patent: 3749889 (1973-07-01), Vaskunas

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