Phase invariant rate 8/10 matched spectral null code for PRML
US5095484A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1991 |
| Grant date | Mar 10, 1992 |
| Priority date | — |
| Expiry date | Aug 19, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1438
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for coding a binary data string for a partial-response channel having a transfer function with a spectral null at zero frequency to provide a coding rate 8/10 and an output which is invariant to 180-degree phase shifts in the channel output signal. A finite-state machine is created having two pairs of states and a plurality of codewords each corresponding to a respective binary data byte. The binary data string is encoded by said machine into a string of binary codewords having a power spectrum value of zero for a frequency of zero. In response to each successive data byte in the binary data string, there is generated one of two complementary codewords from the one of that pair of the states designated by said machine as corresponding to the data byte for the then current state of the machine. The sequence of said one complementary codewords is so decoded as to provide the same data output for said codeword sequence and its complement, irrespective of which of said complementary codewords was generated. The next state of said machine is preselected according to the value of the data byte and current state, and the next state for one element of a pair is the complement of t…
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