Digital information signal encoding method with reduced run leng

Details Digital information signal encoding method with reduced run leng Digital information signal encoding method with reduced run leng

1985-10-09

1987-06-30

Sloyan, I. J.

Communications: electrical

Audible indication

Percussion-type sound producer

358261, 360 39, 360 40, 375 19, H03M 700

Patent

active

046774211

ABSTRACT:
A method of reducing the DC component 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: selecting the 10-bit data words having a sequence of no more than two bits both at the logic level "1" or "0" from both boundaries of the 10-bit data words; classifying the selected 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 data 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: 4387364 (1983-06-01), Shirota
Lewis, Markers in Run-Length-Limited Codes, IBM Technical Disclosure Bulletin, vol. 13, No. 8, 1/1971, pp. 2241 & 2242.

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