Abstract: A Constant Velocity Vector Generator is disclosed for connecting X, Y coordinate points of a rectangular coordinate display system. Simultaneous .DELTA.X and .DELTA.Y step voltages are converted to ramp voltage pairs which are applied to appropriate X and Y deflection circuits of a graphic display device to produce straight-line traces whose velocities are constant for all vectors regardless of magnitude (line length) or direction (angle). Each vector may be drawn to any length or direction, immediately after which new data may be applied to the vector generator to initiate a new vector whose origin is the end point of the preceding vector. Such a system is particularly applicable to computer-drawn displays. The vector generating circuits are suitable for realization in a monolithic integrated circuit.

Abstract: An electronic circuit is disclosed which passes current to an output node when the rate of change of voltage on an input node exceeds a predetermined value. A differentiating network is serially disposed between a voltage-driven source and a normally cut off common base amplifier to monitor the rate of change of the voltage signal. The common base amplifier is prebiased to conduct when the output of the differentiator exceeds the threshold value. The circuit may include temperature compensation means and adjustable prebiasing means. When a pair of such circuits are utilized in a differential or push-pull mode, the displacement current in the pair of capacitors has a serial conduction path for rates of change of input voltage below the threshold value, and a parallel conduction path above the threshold value.

Abstract: An electronic system is disclosed which examines the first derivative of an applied electrocardiographic (ECG) signal, recognizes the R-wave event therefrom, and discriminates against signal components which lie outside predetermined signal parameters in producing a rectangular pulse output. In addition, muscle artifact and pacers are discriminated against. The system includes an automatic gain control to eliminate the need for operator controls.

Abstract: A method and apparatus is disclosed for providing accurate time interval measurements in an oscilloscope. A first voltage which is proportional to the time position of a first selected point along a linear time-base sweep is stored and applied to a subtractor circuit. A second voltage proportional to the time position of a second selected point along the sweep is applied to the subtractor, and the difference between the first and second voltages is obtained. This difference, which is proportional to the time interval between the first and second selected points, is applied to a digital voltmeter calibrated to provide a display in time units.

Abstract: An input amplifier stage is isolated from the main body of an amplifier and instrument ground by a single transformer which provides both an energy path to the input stage and an amplifier signal path from the input stage using a modulated load technique. The secondary of the transformer, which is connected across the input amplifier, includes a rectifier and filtering components to provide a floating D. C. voltage supply.

Abstract: A dual-beam cathode-ray tube having a pair of electron guns and associated deflection means disposed side-by-side on each side of a central axis is described in which the electron guns are parallel and the deflection means includes beam centering plates and angled horizontal deflection plates to direct the electron beams toward the central axis, precluding the need for a large-diameter tube neck in which the entire gun structures are angled. Bowing control plates are disposed adjacent the beam centering plates to minimize trace bowing, and an intergun shield is disposed between the horizontal deflection plates to control and correct display pattern geometry distortion.

Abstract: In a charge storage device, such as a high resolution scan converter tube, flood guns are incorporated to scan the target with substantially unfocused high current electron beams to provide the erasure thereof.

Abstract: A multiple-line display signal generating apparatus is disclosed in which each of a plurality of lines is generated in a normally fixed raster format, wherein any one of the plurality of lines may be selected and positioned wiith respect to the other lines. Programmed current generators provide a fixed displacement current for each line, and a variable displacement current may be selected to replace any of the fixed values.

Abstract: A power supply system which reduced total power consumption during high-line operation by providing a portion of the load current normally supplied by the series regulator of a series type regulated power supply from a lower voltage source through a passive device.