Registers – Coded record sensors – Readout control
Patent
1992-02-10
1993-05-11
Willis, Davis L.
Registers
Coded record sensors
Readout control
235462, 307358, G06K 700, H03K 5153
Patent
active
052103978
ABSTRACT:
A system for converting analog bar code signals from the photo detector of a bar code reader or scanner into pulses occurring in time in correspondence with the spacing of the edges of the bars of the code which has a differentiator circuit and a circuit for integrating in time the differentiated signal to produce a second signal lower in amplitude and delayed with respect to the differentiated signal. A comparator compares the differentiated signal and the integrated signal. The output of the comparator is a train of pulses having edges occurring when the differentiated signal and integrated signal are in a certain amplitude relationship (i.e., approximately equal to each other). The peaks of the differentiated bar code signal occur in coincidence with the scanning of the edges of the bar code. The integrated signal is delayed by a fixed time delay. Accordingly, the edges of the pulses are produced by the comparator when the differentiated signals become smaller and become greater than the integrated signal in relative amplitude thereby producing pulses with the same spacing as the edges of the bars of the code and offset slightly in time. Since the differentiated signal is processed to produce the pulses corresponding to the bar code, errors in timing of the pulse edges due to drifting in amplitude of the analog signal and false transitions are substantially obviated.
REFERENCES:
patent: 3993894 (1976-11-01), Walker
patent: 4360798 (1982-11-01), Swartz et al.
patent: 4528444 (1985-07-01), Hara et al.
patent: 4578568 (1986-03-01), Tsuzuki
patent: 4680457 (1987-07-01), Robertson
patent: 4801788 (1989-01-01), Osaka
patent: 4870367 (1989-09-01), Nakase et al.
patent: 5142130 (1992-08-01), Sato
M. M. Cirovic and J. H. Harter, Electronic Devices, Circuits, and Systems, 1987, pp. 366-367.
Cruft Staff, Electronic Circuits and Tubes, McGraw Hill, 1947, pp. 830-831.
Lukacher Martin
PSC Inc.
Sikorski Edward
Willis Davis L.
LandOfFree
Differentiating and integrating circuit for translating bar code does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Differentiating and integrating circuit for translating bar code, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differentiating and integrating circuit for translating bar code will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1352910