Laboratoire Europeen De Recherches Electroniques Avancees Societe En Nom

Laboratoire Europeen De Recherches Electroniques Avancees

Thomson Consumer Electronics Inc.

Laboratoir Europeen De Recherches Electroniques Avancees, Societe En Nom

Jean-Claude Guillon

Patrick Daniel

Francis Renard

Eric Diehl

Joel Hamon

Michel Leduc

Laurent Perdrieau

Michel Poivet

The invention principally relates to a device and to a method for writing in a storage device of the stack type. The invention relates to the use of stacks (1) of the first-in, first-out (FIFO) type for the unscrambling of television images. In order to be able to write in such a stack (1) starting from a desired address, the procedure begins with writing non-pertinent information in order to increment the stack's internal counter to which there is no access. Then, starting from the desired value of the counter, pertinent information is written. It is possible to rewrite pertinent information over the non-pertinent information placed for example at the start of the stack. The present invention applies in particular to the use of special memories for uses which have not been foreseen by the manufacturer. It applies more particularly to the use of stacks (1) of the first-in, first-out type for the unscrambling of television images.

Device and method for writing in a storage device of the queue type

A device which comprises a memory memorizing, in addition to the RGB components of the digitized video signal and one bit per pixel for the usual control of fast blanking activating the display of characters, at least one bit per pixel for the control of the recording, on a video cassette recorder, of sub-titles but not of menus.

Method for the synchronization of control functions with video signals

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

Device and method for generating control signals

Method of scrambling and of unscrambling composite video signals, and

The method of the invention consists, during the transmission of composite video signals, in the inclusion therein of series of access messages (ECM1, ECM2) and, during the unscrambling, carried out using a chip card reader whose chip card comprises encoded digital data, in using an interactive method of identification of a digital signature.

Scrambling and unscrambling method for composite video signals and

Method of scrambling PAL, SECAM and NTSC composite video signals and

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Gerstheim, France

Jean-Claude Guillon