Deutsche Thomson-brandt Gmbh

Laboratoire Europeen De Recherches Electroniques Avancees

Laboratoire Europeen De Recherches Electroniques Avancees Societe En Nom

Laurent Perdrieau

Heinz-Werner Keesen

Jean-Claude Guillon

Michel Poivet

The present invention concerns a processing method for a video signal coded in the form of blocks of K words, this signal being written to or read from two frame memories (FM1, FM2) each including an input port, a high speed output port and a low speed output port. According to this method, the input digital video signal is formed by sets of M' blocks with N' block containing luminance data (Y1, Y2 . . . ) and M'-N' blocks containing chrominance data (C1, C2 . . . ), the blocks containing the chrominance data (C1) are written in the first memory (FM1) and the blocks containing luminance data (Y1) are written in the second memory (FM2). Then the blocks containing the luminance data and the blocks containing the chrominance data are read simultaneously on the high speed output port of each memory, the memories being inverted at each frame, and the data eventually being processed to obtain video data in output that presents a compression ratio M/N with M&gt;N.

Video signal processing method for changing a video signal display format

A method for displaying a supplementary video image outside a main image. For example, the main image has a 4/3 aspect ratio and the tube has a 16/9 aspect ratio. The method includes steps of processing a supplementary video image at the time of the line return of the main image to provide a video signal of the desired format. Then, multiplexing the components of the main video signal with the components of the supplementary video signal; and then separately processing the components of the multiplexed signal to produce the components of the display signal for a display on the tube. The displayed image has the main 4/3 aspect ratio image in 4/3 aspect ratio occupying approximately 12/9 of the screen and supplementary video images occupying the remaining 4/9 of the screen.

Process for the insertion of a supplementary video information set

Circuit arrangement for processing video components

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Illkirch, France

Laurent Perdrieau