System for locating failure signals by comparing input data with stored threshold value and storing failure addresses in alternating buffers
US5185883A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1990 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | Oct 26, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/05
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data acquisition circuit for receiving an analog input signal having a magnitude representing light intensity detected by a sequentially accessed, linear array of photocells of a line scan camera and providing digital data signals for use by a computer, the circuit including an analog-to-digital converter to convert said analog input signal to a stream of digital intensity signals, an offset memory storing offset correction values for respective photocells, a gain memory storing gain correction values for respective photocells, an adder connected to add or subtract the digital intensity signal for a given photocell to the offset correction value for that photocell and provide an offset-corrected digital signal, a multiplier connected to multiply the offset-corrected digital signal for a given photocell times the gain correction value for that photocell to provide a calibrated digital signal. Also disclosed are: comparing, on a photocell-by-photocell (i.e., pixel-by-pixel) basis, the value of the digital intensity signal for each photocell with a respective threshold value stored in a threshold memory; a processing circuit that determines when the intensity values for adjacent pho…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.