Flying spot pattern storage system
US4123797A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1977 |
| Grant date | Oct 31, 1978 |
| Priority date | — |
| Expiry date | Mar 1, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/39
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A storage system is provided in which digital numbers are read into a memory by periodically sampling a pair of analog input signals and in which the memory is scanned in timed relation to the signal sampling and also in timed relation to the scanning of a cathode ray tube screen in a raster pattern, the scanning spot being brightened when a stored digital number is detected. A pair of digital-to-analog converters are used both in sampling and for raster scanning. In sampling, the outputs thereof are compared with the input signals to control analog-to-digital logic circuits and the inputs thereof are connected through multiplexers to the output of the analog-to-digital logic circuits which operate as successive approximation registers. In raster scanning, the inputs of the digital-to-analog converters are connected to counter sections driven from a high frequency clock one being operative to develop a sawtooth signal to generate a sweep line and the other being operative at a field or frame rate. The memory is also connected through the multiplexers, alternately to the outputs of the analog-to-digital logic circuits and to the counters to be scanned in synchronism with the scannin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.