The invention comprises an arrangement for controlling the uniform intensity of different length displayed strokes, produced at different writing rates by a deflectable beam of a CRT, during a series of equal duration clock periods. The arrangement which is provided with the writing rates of each stroke along the X and Y axes of the display surface, estimates stroke length L; L is derived by implementing k(X/2 + Y/2 + P/2), where X and Y are the writing rates along the two axes, P is the greater of the two rates and k is either 1 or preferably 0.94. The estimated stroke length is used to control beam intensity as the beam is deflected from the stroke's start point to its end point.
A character display system which generates analog signals to write sequentially specified strokes forming a character on a display device is described. The character strokes are stored as digital words in a Read Only Memory (ROM) and are sequentially read out in response to instructions to write a specified character. The ROM also contains address words that specify a group of words elsewhere in the ROM that together constitute the instructions for writing the character designated. The address words include fields controlling incrementing within the addressed word group, movement on the display device to a new character space, and positioning of the character space on that display device. Each word in a character word group includes fields representing the X- and Y-end points of the stroke signal, the slope of the X- and Y-components, the blanking and unblanking of the stroke signal, and, in some cases, a pause in movement where a change in slope occurs during execution of a single word. The system permits displacement of the X- and Y-end points in X-, Y- and Z- planes for display on an X-Y coordinate display means. The system also permits modifying the scale of a character, rotating a character in 90.degree. increments, slanting a character, and any combination of displacement, modification, 90.degree. incremental rotation and slanting.
Digital wave observation apparatus includes first and second A/D converters to convert input signals of first and second channels into corresponding first and second digital signals. First and second delay circuits selectively delay the first and second digital signals, and a wave memory stores signals output from the first and second delay circuits for purposes of display. A first command device receives channel designating data corresponding to the first channel and desired delay value setting data, and provides first delay data to a first delay value setting device coupled to the first delay circuit. A second command device receives designating data corresponding to the second channel and desired delay value setting data, and provides second delay data to the first delay value setting device and a second delay value setting device coupled to the second delay circuit.
In a cathode ray tube display system of the type utilizing stroke techniques, the display refresh rate is allowed to decrease from a specified maximum in order to ensure that all stroke information is displayed. When the cathode ray tube display system further includes a raster symbol generator, the display refresh rate varies as a function of a fixed raster time interval and a variable stroke time interval.
