Abstract: A UHF transmitter for digital TV signals includes, for example, twelve silicon carbide transistor RF output power amplifier panels driven in parallel by two silicon carbide amplifier driver panels and where each panel is comprised of two modules each further including a 180.degree. signal splitter, a pair of quadraphase signal splitters and combiners, a 180.degree. signal combiner, and five RF amplifier pallets which themselves are comprised of two silicon carbide transistors located on a common flange and operated in push-pull relationship so as to suppress even order distortion products and reduce sensitivity to ground currents. A monitoring system, including a touch screen control display and control panel senses the status of all assemblies so as to allow an operator to control the transmitter and inquire about the status of the various components and power supplies, and to replace one or more units as required without the need for turning the transmitter off.

Abstract: In a chroma-key method for inserting a background picture signal into key color-characterized key regions of a foreground picture signal, in which method fading operations are performed between the picture signals in proportional zones in dependence upon a control signal, while intermediate colors occurring in the proportional zones in the foreground signal are transformed into new intermediate colors which constitute a transition from the color of the foreground picture signal to that of the background signal, an optimal adaptation of the proportional zone to the respective color location of a foreground picture signal region is ensured in that individual proportional zones for regions of different color locations in the foreground picture signal are fixed in such a way that the distance between the color location of each region and the color location of the key color is determined individually for each region, and in that the control signal is generated for each region in dependence upon the color location

Abstract: A luminance signal is formed from an original color signal and is used to determine a new luminance. The original color signal is then adjusted to have the new luminance in a way that does not change the hue or saturation of the original color. The method is embodied in an analog or a digital circuit and in the alternate may be may be emulated in a general purpose computer. The method permits a change in color signals which affect the overall brightness only in a non-linear way, while adding only a small amount of additional hardware or computation to implement the invention.

Abstract: A ghosts removal apparatus for removing a waveform distortion and ghost in television receivers and other various types of image apparatus, can exclude the influence of random noise when ghost is removed, and can favorably remove minute ghost components. A multiplication ratio setting circuit has a second judgment circuit in which a number of ghost removal is counted, and a read only memory (ROM) table which outputs a gradually smaller value of a ghost detection coefficient along with the counted number larger. At the start of ghost removal processing, a large value of the ghost detection coefficient is outputted to exclude the influence of the random noise, and along with the progress of ghost removal processing, a smaller value of the ghost detection coefficient is outputted so that minute residual ghost components can be accurately detected. Accordingly, it is possible for the tap gain of the transversal filter to be set to an optimum value and for ghost to be favorably removed.