Method and apparatus for encoding an NRZI digital signal with lo

Details Method and apparatus for encoding an NRZI digital signal with lo Method and apparatus for encoding an NRZI digital signal with lo

1982-04-23

1985-05-28

Krass, Errol A.

Communications: electrical

Audible indication

Percussion-type sound producer

360 40, H03K 1324

Patent

active

045203466

ABSTRACT:
Successive n-bit information words are converted into successive m-bit NRZI code words by assigning to each n-bit information word at least one m-bit code word having a respective NRZI disparity. The digital sum variation of the preceding m-bit NRZI code words is determined and the polarity of the conclusion of the immediately preceding m-bit NRZI code word is detected. An assigned m-bit code word is selected to represent the next n-bit information word as a function of the NRZI disparity of that code word, the determined digital sum variation and the detected polarity. The selected m-bit code word then is modulated in NRZI format such that the modulated code word has the same initial polarity as the detected polarity. The m-bit code word is selected such that its NRZI disparity, when combined with the determined digital sum variation, tends to prevent the digital sum variation from increasing.

REFERENCES:
patent: Re31311 (1983-07-01), Miller
patent: 3405235 (1968-10-01), Carter
patent: 3581297 (1971-05-01), Behr et al.
patent: 3697874 (1972-10-01), Kaneko
patent: 3753113 (1973-08-01), Maruta et al.
patent: 3902117 (1975-08-01), Sheppard
patent: 4343023 (1982-08-01), Nishimura et al.
patent: 4369516 (1983-01-01), Byrns
patent: 4387364 (1983-06-01), Shirota

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