H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/222
H04L 25/49 (2006.01) G11B 20/14 (2006.01)
Patent
CA 1180450
METHOD AND APPARATUS FOR ENCODING AN NRZI DIGITAL SIGNAL WITH LOW DC COMPONENT ABSTRACT OF THE DISCLOSURE 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.
401199
Gowling Lafleur Henderson Llp
Sony Corporation
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