Coding method for reducing the D.C. component in the data stream

Details Coding method for reducing the D.C. component in the data stream Coding method for reducing the D.C. component in the data stream

1992-01-17

1994-01-04

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 34, 371 571, 341 58, H04L 2534

Patent

active

052767086

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.

REFERENCES:
patent: 4310860 (1982-01-01), Leiner
patent: 4387364 (1983-06-01), Shirota
patent: 4491869 (1985-01-01), Heitmann
patent: 4620311 (1986-10-01), Schouhamer Immink
patent: 4698809 (1987-10-01), Munter
patent: 5042037 (1991-08-01), Endoh

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