Medical monitor raster display smoothing circuit - has sampling circuit and requires max width equal to twice separation between parallel paths

摘要

The raster lines of the cathode ray tube are the paths along which the patterns are formed, the signals of the first set that successively increase the width of the contrast pattern and the signals of the second set that successively decrease the width of the contrast pattern must occur in sequence as the beam is scanning along the raster line or path, but when the raster lines intersect the path, the signals in the two sets of signals occur a line scanning interval apart. The signal for any intersection is the same in either case, but the time of occurrence differs. In either case, a signal calling for a particular width at a particular point along a path must be available to control the spot size of the electron beam when it arrives at that point, whether it is scanning along the path or transverse to it.