Variable accuracy trend graph display apparatus
US4231032A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1978 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Sep 7, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R13/408
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A graph display apparatus using a CRT display unit of raster scanning type for displaying a graph with a high accuracy, that is, a high resolution. The apparatus comprises a raster counter for counting the number of rasters to identify the raster number of the scanning lines presently scanning the display screen of the CRT display unit, and a plurality of graph display units for displaying a graph with a standard accuracy. Each graph display unit comprises a memory having a capacity corresponding to the number of time points obtained by dividing the time axis extending in the scanning direction of the raster on the display screen by the number n of data plotting for storing the raster numbers corresponding to the levels of the quantities to be displayed at the individual time points, and a comparator comparing the output of the raster counter with the output of the memory read out sequentially in timing relation with the individual time points for providing a coincidence detection signal only when coincidence is reached between the output of the counter and the output of the memory at a time point. The display signal outputs of these graph display units are combined to display a gr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.