False-transition inhibitor circuit for a bar code reader

Details False-transition inhibitor circuit for a bar code reader False-transition inhibitor circuit for a bar code reader

1995-04-20

1996-09-17

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235463, G06K 710

Patent

active

055570941

ABSTRACT:
A false-transition inhibitor circuit for a bar code reader that produces a detection signal from a scan of a bar code, a first derivative signal related to the first derivative of the detection signal, and a peak signal indicating peaks of the detection signal includes an inhibitor comparator, a latch comparator, and a feedback circuit. The inhibitor comparator compares the first derivative signal to a feedback signal and sets and outputs an inhibition signal in a blocking state when the first derivative signal bears a first relationship to the feedback signal. The latch comparator prevents the transmission of the peak signal when the inhibition signal is in the blocking state. The feedback circuit samples the inhibition signal and the output of the latch comparator and to produce the feedback signal.

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