A pair of input signals corresponding to X and Y coordinate information are processed and simultaneously applied at certain time intervals to a display system, and the points represented by said pair of input signals are successively connected by straight lines. In a first embodiment of the signal processing, wherein the input signals and digital signals, such input signals are applied to a first digital analog converter for converting the digital signals into related quantum analog voltages whereupon the quantum voltages are applied to a second digital analog converter which effectively adds the quantum voltages. The output of the second converter is impressed upon a CRT display of the oscilloscope or an XY recorder, thereby tracing a figure on the display or recorder. Alternatively, the first digital analog converter can be replaced by an analog attenuator for converting analog input signals into related analog quantum voltages which are then processed the same as in the above-mentioned first embodiment. Thus, very accurate coordinate presentations can be traced on a CRT display of the oscilloscope or an XY recorder.
A general purpose logic state analyzer selectively stores, formats and displays a digital signal representing a sequence of data states input thereto and provides a graphical display of the stored data states and a count of selected events occurring intermediate to the occurrence of the data states stored. Selective storage of the input data states is provided by comparing the input data states to a preselected sequence of first qualifier state conditions and enabling the storage of input data states in response to the satisfaction of the preselected sequence. Storage is further qualified by storing only data states which individually meet one of a preselected set of second qualifier state conditions. Selective formatting of the stored data states is provided by converting the stored data states in response to selectable assignments of contiguous sets of bits of each stored data state to logical fields, a selectable concatenation of the logical fields, and to radicies selected for each of the respective logical fields. The converted stored data states can be displayed as a formatted listing or as a graphical display. In the graphical display the stored data bits corresponding to a selected logical field are interpreted as a binary magnitude and plotted as the ordinate and the chronological storage location is plotted as the ordinate and the chronological storage location is plotted as the abscissa on a cartesian coordinate system. A count of selected events is obtained from the contents of a binary counter and stored in a second memory in parallel with the storing of each data state. This counter can be incremented selectively in response to either an internal clock or in response to the detection of an input data state satisfying a selected count-qualifier state condition.
A method and apparatus for generating a stroke on a display comprising a pair of pulse train generators coupled to a pair of charge pump and integrator assemblies by means of a switch assembly. In operation, a first pulse train corresponding to the larger of the X and Y components of the stroke and a second pulse train corresponding to the ratio of the X and Y components of the stroke control the magnitude of the output of the charge pump and integrator assemblies.
With a directed beam imaging system, a method is presented employing a low-pass filter in the positional signal path, a time-discrete positional signal, and precompensation of this time-discrete signal for phase and amplitude errors of the overall positional control circuitry. As a consequence of this method, the uncompensatable vector nonlinearities of the prior art vector stroke are obviated, the useable system bandwidth or stroke per unit time is extended beyond the prior art to the maximum driveable frequency, and in many text and graphics applications fewer strokes are needed to produce the desired image.
