Method and apparatus for reducing DC components in a digital inf

Details Method and apparatus for reducing DC components in a digital inf Method and apparatus for reducing DC components in a digital inf

1980-07-23

1983-06-07

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

375 19, 358261, 360 39, 360 40, H04L 300

Patent

active

043873642

ABSTRACT:
A method of reducing DC components in a digital information signal comprised of a plurality of 8-bit data words by converting each of the 8-bit data words to a 10-bit data word, comprises the steps of grouping the 10-bit data words by weight in accordance with the run length of data of each of the 10-bit data words, with the 10-bit data words only including five or six logic level "1" bits; assigning each of the 8-bit data words to one of the 10-bit data words in accordance with the frequency of occurrence of the 8-bit data words so that 8-bit data words having a high frequency of occurrence are assigned to 10-bit data words having a short run length; classifying the grouped 10-bit data words into a first group consisting of 10-bit data words having five logic level "1" bits, a second group consisting of 10-bit data words having six logic level "1" bits, and a third group consisting of 10-bit data words having four logic level "1" bits, with the third group being formed by inverting the 10-bit words in the second group; and further assigning the 8-bit words alternately to the 10-bit words in the second and third groups when such 8-bit words correspond to previously assigned 10-bit words having six logic level "1" bits and assigning the remaining 8-bit words to the 10-bit words in the first group.

REFERENCES:
patent: 3631471 (1971-12-01), Griffiths
patent: 4020282 (1977-04-01), Halpern
patent: 4161757 (1977-06-01), Spencer et al.
patent: 4168513 (1979-09-01), Hains et al.
Baldwin, Digital Television Recording With Low Tape Consumption, International Broadcasting Convention 1978, IEE Conference Publication No. 166, pp. 133-136.

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