Abstract: A circuit for selectively supplying current to the horizontal oscillator from one of two voltage sources. The first voltage source is primarily used to supply current to the horizontal output stage and supplies the oscillator only during startup of the horizontal deflection system. The second source is derived from a winding on the flyback transformer and supplies current to the oscillator after the startup period, that is, after its voltage or another or other voltages developed by sources derived from flyback windings have reached values sufficient to assure sustained operation of the horizontal deflection system. A startup detector responsive to a flyback-derived voltage determines which of the two voltage sources provides current at the output of the starting network, that is, at the power supply terminal of the horizontal oscillator.

Abstract: In a television receiver containing both circuitry returned to the AC line and circuitry returned to an isolated chassis ground, a voltage supply isolated from the AC line for a horizontal oscillator returned to the chassis ground. The supply is developed by a winding magnetically coupled to an inductor in a switching regulator that is coupled to the AC line and operates at a frequency substantially equivalent to the horizontal oscillator frequency. With the horizontal oscillator operative, supply voltages for the remainder of the receiver's line-isolated circuitry can then be derived from windings on the flyback transformer.

Abstract: The visual system within an aircraft flight simulation system receives flight data from a flight simulation computer, and terrain data from a gaming area data base. A computer within the visual system organizes this image data in a buffer memory according to a particular format, and forwards the image data to an image processor. The following types of data are formatted and processed:Position vectors, defining the changing position of the aircraft with respect to the origin of the terrain coordinate system.Rotational data, defining the changing attitude of the aircraft with respect to the terrain coordinate system.Initialization vectors, defining the position of the landmark points within the terrain coordinate system. The landmark points are translated into the aircraft coordinate system to form translated vectors.Delta data, defining the position of other points, lines, and faces with respect to the landmark points.CIF data, defining color, intensity, defocus, etc.

Abstract: A horizontal output stage including a switching device for coupling the input of the horizontal output transistor to a feedback network and bias means during startup and to the secondary of an interstage coupling transformer during steady-state operation. During startup the output transistor operates in an oscillatory mode thereby developing an alternating current in the flyback transformer. The supply voltage for the horizontal oscillator is derived from a winding on the flyback transformer. Once this supply voltage reaches the value required for sustained operation of the oscillator, the switching device disconnects the output transistor from the feedback network and couples it to the interstage transformer so that the output transistor is driven by the signal developed by the horizontal oscillator.

Abstract: A circuit for enhancing the operation of a first voltage supply magnetically coupled to and derived from a second voltage supply. A signal source indicative of the voltage developed by the first supply is coupled to a detector. The detector operates to selectively couple a switchable momentary load across the second supply in response to outputs of the first supply below a desired value. The momentary load causes an additional incremental current to flow through an inductive element in the second supply and results in greater voltage induced in a winding of the first supply that is magnetically coupled to the inductive element.

Abstract: An improvement in a television receiver circuit for producing rapid discharge of the capacitors of the primary d.c. power supply upon turn-off of the receiver. The disclosed improvement eliminates the need for conventionally used bleeder resistors by the addition of a direct coupling means to existing horizontal sweep circuitry to derive a current which switches the horizontal driver transistor to continuous conduction upon turn-off of the receiver, thereby rapidly discharging the capacitors of the main power supply.