Method and apparatus for simulating analog display in digital display test instrument
US5065147A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1989 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | May 17, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R13/0227
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for simulating an analog display in a digital display spectrum analyzer (or other digital display test instrument) comprises the steps of defining a plurality, N, of traces of the signal to be displayed, assigning coordinate values to points along each trace, and plotting and simultaneously displaying each of the N traces by illuminating corresponding pixel locations on the CRT as indicated by the assigned coordinate values. The method permits effective simulation of trace persistence as commonly found in analog display test instruments. According to one embodiment of the invention, a color graphics controller/color CRT may be provided, in which case gray scales may be generated and displayed to simulate variations in intensity levels as commonly found in traces plotted on analog display test instruments. An apparatus for practicing the method is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.