Registers – Coded record sensors – Particular sensor structure
Patent
1990-09-20
1991-11-26
Pitts, Harold
Registers
Coded record sensors
Particular sensor structure
235463, 235472, G06K 710
Patent
active
050685201
ABSTRACT:
A signal processing circuit of a bar code reader, includes a signal input unit for optically detecting a bar code provided on a surface of goods and outputting a first signal after optical-to-electrical conversion, a differential unit connected to the signal input unit, for amplifying and differentiating the first signal, and filtering the differentiated first signal to eliminate high frequency noise, and outputting a second signal after filtering. A comparison unit is connected to the differential unit, for integrating the second signal and outputting a third signal after integration, and comparing the second signal with the third signal and outputting a fourth signal when the third signal is larger than the second signal. A slice level generation unit is connected to the differential unit, for holding a peak voltage of the second signal, suppressing the peak voltage to a predetermined upper limitation voltage, discharging the suppressed peak voltage in accordance with a predetermined time constant, and dividing the suppressed peak voltage into a predetermined voltage rate to obtain positive and negative slice voltages. A gate signal output unit is connected to the differential unit and the slice level generation unit, for comparing the second signal with the positive and negative slice voltages. A signal output unit is connected to the comparison unit and the gate signal output unit, for inputting the fourth signal and the positive slice voltage, the inverted fourth signal and the negative slice voltage, and outputting a gate signal to obtain a binary-coded signal.
REFERENCES:
patent: 3909787 (1975-09-01), Laurer
patent: 4000397 (1976-12-01), Hebert et al.
patent: 4125765 (1978-11-01), Cowardin et al.
patent: 4870262 (1989-09-01), Hasegawa
Fujitsu Limited
Pitts Harold
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