Deutsche Thomson-brandt Gmbh

Heinz W Keesen

Herbert Schutze

Dieter Haupt

Deiter Haupt

Siegfried Schweidler

Edgar Peters

Friedhelm Holtz

A method for digitally transmitting/recording component-coded color television signals includes the step of, upon transition from a first picture aspect ratio to a second picture aspect ratio obtaining at least part of an additionally required transmitting/recording capacity for coding an additionally formed area of pictures with the second picture aspect ratio by vertical sub scanning of one or more chrominance components.

Method for the transmitting/recording of video signals of different

A block of picture elements is DCT transformed and coded to produce a corresponding data block of variable length codewords having an average length. The data blocks are apportioned among fixed length transport blocks as needed to produce full transport blocks. The transport blocks include a direct (DC) component and alternating components at prescribed locations, as well as an address information flag indicating whether or not block data is longer or shorter than the average length, and an address pointer, to facilitate recovery and synchronization of apportioned data blocks at a decoder.

System for processing a digital signal including auxiliary data to

For transmission of coded picture data, coded data may be arranged in blocks having a predetermined average length. Blocks which are not full are filled with data from other blocks. To support decoding in the presence of interference, each of the blocks additionally contains an address pointer which points to addresses in a decoder memory from which data separated from blocks having a greater than the average word length are reconstituted and used for decoding. The additional address pointer information, for a constant channel capacity, results in a lower data rate for picture data, which may lead to reduced picture quality during undisturbed decoding. Respective recovery pointer pairs having full word width are inserted between a predetermined number of data blocks, whereby other address pointers only cover the Least Significant Bits having full word width. Accordingly, additional data can be inserted into the data stream.

Coder and decoder apparatus for a data transmission system

A video signal processing system includes encoder apparatus applying a Discrete Cosine Transform (DCT) to N.times.N (e.g., 8.times.8) image data blocks. Resulting DCT coefficients are further transformed by multiplying them with a special transform matrix of predominantly zero values. A comparator determines whether the original DCT coefficients or the further transformed DCT coefficients will be coded for data compression, with respect to static or dynamic image content. Complementary transformation is performed at a decoder.

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Hanover, Germany

Heinz W Keesen