Registers – Coded record sensors – Particular sensor structure
Patent
1991-11-01
1994-03-29
Nelms, David C.
Registers
Coded record sensors
Particular sensor structure
250568, G06K 710
Patent
active
052987280
ABSTRACT:
A signal processing apparatus and method adapted for use in bar code scanners is described. The apparatus forms a derivative signal, and utilizes the derivative signal to detect transition points from white to black bars and vice-versa. Then, the apparatus starts and stops the generation of digital pulses at or about the transition points, thereby generating pulses having widths corresponding to the widths of the bars making up the bar code symbol. The apparatus is capable of successively scanning a bar code symbol more than once, and varying various processing parameters used in forming the derivative signal over the successive scans, including threshold level, overall bandpass, overall amplification, and the like.
REFERENCES:
patent: 3225213 (1967-12-01), Kinrichs et al.
patent: 3502993 (1970-03-01), Schurzinger et al.
patent: 3751636 (1973-08-01), Coles, Jr.
patent: 3761725 (1973-09-01), Meyer
patent: 3804979 (1974-04-01), Knowles
patent: 3909594 (1975-09-01), Allais et al.
patent: 3991299 (1976-11-01), Chadima, Jr. et al.
patent: 3999043 (1976-12-01), Reiss et al.
patent: 4000397 (1976-12-01), Herbert et al.
patent: 4020357 (1977-04-01), Punis
patent: 4078227 (1978-03-01), Fahey et al.
patent: 4104514 (1978-08-01), Sherer et al.
patent: 4140271 (1979-02-01), Nojiri et al.
patent: 4162408 (1979-07-01), Hansen
patent: 4175256 (1979-11-01), Dolikian
patent: 4196845 (1980-04-01), Chesters
patent: 4354101 (1982-10-01), Hester et al.
patent: 4360798 (1982-11-01), Swartz et al.
patent: 4749879 (1988-06-01), Peterson et al.
patent: 5103080 (1992-04-01), Barkan
patent: 5149948 (1992-09-01), Chisholm
"A Low Cost Light Wand Amplifier," Robin C. Moseley, Byte Magazine, May 1978, vol. 3, No. 5.
"Dynamic Threshold Circuit," IBM Technical Disclosure Bulletin, vol. 15, No. 4, Sep. 1972, pp. 1138-1139.
"Signal Processing For Optical Bar Code Scanning," Merkowitz, Byte Magazine, Dec. 1976.
"Contrast Amplifier," IBM Technical Disclosure Bulletin, vol. 14, No. 3, pp. 883-884, Aug. 1971.
Elliott Randy D.
Loris Blaine F.
Nelms David C.
Shami K.
Spectra-Physics Scanning System, Inc.
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