Abstract: A TV signal receiver has a tuner for deriving a first TV signal from the input signal, and a device for storing in a memory and reading therefrom a plurality of blocks of a second TV signal derived from the input signal. The first TV signal has interruptions during which a block of the second TV signal is insertable so as to obtain a composite TV signal which is supplied at an output terminal of the receiver.

Abstract: Finite audio and video signals are subjected to some digitalizing encoding format and converted into blocks of audio and video words, respectively. For transmission of these blocks via a compact disc, the words are arranged in packets. Each packet has a packet header and a data field. Such a data field comprises either only audio words or only video words. The packet heater indicates whether the associated data field comprises audio or video words. In order to transmit only changes in the picture in the case of, inter alia, quasi-stationary pictures, each block of video words is divided into a number of sub-blocks and an operational code is added to the beginning of each sub-block. This defines, inter alia, picture elements and the sub-block itself gives video words for these pictures elements.

Abstract: A method and apparatus for storing and reading digital information, in which the recorded information is protected by a double symbol correcting code involving interleaving between the codes and also employing an additional, optional error correcting code. The information is organized in sectors, which are arranged such that following the synchronization and header information sub-header information is provided to indicate different sub-modes of operation of the playback apparatus. During playback, when a first sub-mode indication value is detected, this means the sector contains further error protection information, that is, the optional error correcting code, for which purpose a special decoder is activated. When the sub-mode detector detects a second sub-mode indication value, this means that further user information is present at the location where the optional error protection information would have been, and the special decoder is not activated.

Abstract: Finite audio and video signals are subjected to a digitizing code format and converted into blocks of audio and video words respectively. For the transmission of these blocks via a record carrier (2), for example a compact disc, the words are arranged in frames, Each frame has a frame header (8.1) and a data field (8.2). Such a data field contains information words in the form of either audio words or video words. The header indicates whether the associated data field contains audio words or video words. At least two audio signals associated with a video signal are recorded on the record carrier. An example of this is a "slide show" in which the explanatory text is available in two or more languages (e for English, f for French). The frame header of the frames containing an encoded audio signal also indicate to which one of the two or more audio signals the information words in an audio frame belong. Further, reference signals and additional frames (6)are recorded in the record carrier.

Abstract: A system is described for the line-wise compression and decompression of a video color picture. The pixels are decoded in Y-U-V bit series, thus forming code words which each contain, for example six Y-bits of different significance and also one U-bit and one V-bit. The bit series, notably the more-significant series of Y-bits (Y5 . . . Y3) are independently compressed in a compression translator so as to from length indication codes. Furthermore, at least two bit series are combined in a logic circuit (44, 46, 48), the series of combination bits then being subjected to a compression operation (50). The reverse procedure takes place upon decompression.