Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1979-10-09
1985-04-23
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
315367, 315383, 340347CC, 340347M, 328144, 358 32, 358164, H03K 1302
Patent
active
045132780
ABSTRACT:
A digital video display system wherein the various characters to be displayed are displayed in the form of images of the complete character rather than the standard dot-matrix pattern of the prior art. A character generator in the display system stores signals representing the various characters to be displayed which are retrieved from storage in response to a character code. The signals are in the form of a binary code having a sufficient number of bits to represent a different number of levels of gray-scale or luminance values for the various picture elements making up the character image. The binary codes thus retrieved from storage are supplied to a video synthesizer that generates the video signal to display the character images which may be displayed in a number of different modes including white-on-black, black-on-white, black-on-gray, and white-on-gray as well as different combinations of such modes to represent a cursor. The video synthesizer can generate output voltage levels in discrete steps for the different luminances to be employed. The voltage output signals differ from level to level in accordance with the 2.2 root of luminance.
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Grunewald Paul
Parker Marshall M.
Seitz Charles L.
Stafford Irvin G.
Burroughs Corporation
Fassbender Charles J.
Peterson Kevin R.
Sloyan T. J.
Young Mervyn L.
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