Coding method for reducing the D.C. component in the data stream of a digital signal
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United States of America Patent
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Jan 4, 1994
Grant Date -
N/A
app pub date -
Jan 17, 1992
filing date -
Jan 25, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
For reducing the d.c. component of a digital signal in which a good many data words are put together in data blocks each having the same number of words, a supplementary word is derived and is transmitted or stored along with the data words. The bit mix of the supplementary word contains information for shifting the word bit-mix range, defined in accordance with the d.c. component of various words of the data words in the data block. The bit-mix value of the supplementary word is derived by evaluation of the weighting of ASE-coded data words in the data block, this being done in a manner dependent on the standard deviation and an expected value or center of gravity of the data block. A difference value determined with respect to the center of gravity and the value of a middle level value of a data word represents the value of the supplementary word with which, by the use of the modulo-2 addition the digital signal is shifted in bit-mix value range. The supplementary word is transmitted or recorded with each data block and is used in an operation which is the inverse of what is done before recording or transmission so that the original digital signal will be available again.
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