Abstract: A combined electric/optic cable has a triaxial cable having, along one and the same central axis, three imbricated, concentric, tubular, electric conductors and a central optic fiber. The present invention may find particular application in high definition television systems.

Abstract: The optical sight for the correction of the geometry of the convergences of a color camera according to the invention is such that it is adapted to the two most common formats and therefore usable in bi-format 4/3 and 16/9 cameras: the sight is constituted of a group of elementary motifs constituted of a central zone of n lines of p motifs and adjacent zones formed of two lines of p motifs used in addition to the central zone for the 4/3 format, and two columns of n motifs, used in addition to the central zone for the 16/9 format.

Abstract: The obtaining of a geometrical effect, with an image, is done by a two-dimensional filter with variable characteristics controlled by a computer to compute the points of a pre-established conversion grid, superimposed on the image, as a function of neighboring points of the original image and of the desired effect. A memory contains the original image. Auxiliary images, obtained by successive reductions, in fixed proportion, of the original image, are stored and a point of the conversion grid is computed by selecting that of the memories for which the reduction factor enables the easiest computation while, at the same time, preserving the quality of the image.

Abstract: A device for correcting shading in video signals which has conventionally occurred due to variations in speeds of the scanning spots. Speeds of the scanning spot are detected, and variations in these speeds are also detected. In addition, conventional-type digital correction values for correcting geometry and convergence errors are produced. Variations in speed are detected, and are digital-to-analog converted. A shading output correction signal indicative of a sweep speed variation is produced. This signal is added to the digital correction values to form a corrected correction value.

Abstract: An apparatus for modifying the appearance of the points of an image on the screen of a graphic image display console comprising a graphic memory storing all the points of the screen interposed between the screen and the display console and a control processor. The graphic memory is organized in words of n bits, each bit is representative of the state of a point of the image and has a value 1 or 0 depending on whether the point which it represents in the image is visible or merges with the background of the image. An attribute memory contains the attributes of each of the image points. The device also comprises a decoder for selecting a bit from each word read out from the graphic memory. A modification circuit is connected to the decoder, to the attribute memory and to the processor for modifying each attribute of the point corresponding to the bit selected of a word by means of modification bits supplied by the processor and for storing each modified attribute in the attribute memory.