Static information storage and retrieval – Radiant energy – Electron beam
Patent
1977-03-01
1978-10-31
Fears, Terrell W.
Static information storage and retrieval
Radiant energy
Electron beam
365217, G11C 1126
Patent
active
041237978
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 scanning of the screen. The multiplexers are so switched that sampling is performed between successive sweep lines.
REFERENCES:
patent: 3624633 (1971-11-01), Hofstein
Flaherty John J.
Strauts Eric J.
Fears Terrell W.
Magnaflux Corporation
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