Sony Corporation

Willi Studer Ag

Willi Studer

Willi Studer Ag & Sony Corporation

Claudia Brandes

Roger Lagadec

Toshitada Doi

Yukio Fukuju

Methods and apparatus for recording and reproducing coded digital signals typically assign values of a signal to 2 categories which are separately coded, delayed differently, and subsequently recorded. In order to reduce the loss of such values in the cases of damage to the recording to the greatest possible extent, the values of the signals are coded at least twice in parallel and recorded onto several tracks. In one of the recordings, the sequence of values is modified in such a way that even major damage to the recording can be accommodated without producing non-correctable errors.

Method and apparatus for recording and reproducing coded digital signals

Method and apparatus for transforming a first sequence of digital data and correction words having a first ordering thereof wherein blocks of data and correction words in the first ordering are formed out of the first sequence Data and correction words are selected from the first sequence and are combined in such manner as to form a second sequence with a second ordering. First and second groups of data and correction words are selected out of the second sequence. The first and second groups have one comon word which also belongs in one of the blocks. The data groups have one common word which also belongs in one of the blocks. The data words of the first and second groups are submitted simultaneously to a checking operation. The results of this operation are evaluated to decide if erroneous data words can be corrected. The second sequence of words is corrected using the correction words indicated by the evaluation.

Method and apparatus for decoding

Method of digital signal transmission

Method of recording odd and even words of one channel PCM signals in

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Ruemlang, Switzerland

Claudia Brandes