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US 7,397,398 B2Granted
Modulation bit added to worst case codeword
AssigneeSeagate Technology LLC
InventorsMing Jin, Hiauchoon Kee, Zhenyu Sun, Liu Li, Myint Ngwe
Life of this patent
Estimating the term…
Abstract
A data word is error correction encoded to provide a worst case codeword without bit transitions between worst case codeword bits. A modulation bit is calculated as a function of the worst case codeword. The modulation bit has a bit polarity opposite a bit polarity of the worst case codeword bits. The worst case codeword bits are added with the modulation bit to form a modulated code word.
Claims24
An apparatus, comprising:
- electronics that provides worst case codewords without bit transitions between worst case codeword bits;
- electronic circuitry calculating modulation bits as a function of the worst case codeword bits and adding a modulation bit to the worst case codeword bits to form a modulated code word, the modulation bit having a bit polarity opposite a bit polarity of the worst case codeword bits to provide a bit transition;
- and
- decoder electronics that decode the modulated code word.
1 more element
A modulation process, comprising:
- providing a data word to provide a worst case codeword without bit transitions between worst case codeword bits;
- calculating a modulation bit as a function of the worst case codeword the modulation bit having a bit polarity opposite a bit polarity of the worst case codeword bits;
- and
- adding the worst case codeword bits with the modulation bit to form a modulated code word.
1 more element
A demodulation process, comprising:
- receiving a modulation code word that comprises a worst case codeword and a modulation bit;
- testing the received modulation code word for polarity and storing a testing result;
- and
- removing the modulation bit from the modulation code word to generate a reproduced worst case codeword, wherein the modulation bit has a bit polarity which is opposite a bit polarity of the worst case codeword and which provides a bit transition to the worst case codeword.
1 more element
Dependencies are inferred from the claim text.