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US 4,786,890 AGranted
Method and apparatus for implementing a PRML code
AssigneeInternational Business Machines Corporation
InventorsBrian H. Marcus, Arvind M. Patel, Paul H. Siegel
Life of this patent
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Abstract
A rate 8/9, constrained partial response class IV code having run length limitation parameters (0,3/5) is provided for any partial response (PR) signaling system employing maximum likelihood (ML) detection.
Claims7
Apparatus for encoding a preselectable number of bits of binary data into codewords having a preselectable number of bits, said apparatus comprising:
- receiver means for receiving the preselectable number of bits of binary data;
- and
- encoder means, coupled to the receiver means, for producing sequences of codewords each having at least two interleaved odd and even subsequences in response to said bits of binary data;
- said sequences of interleaved subsequences having no more than three consecutive zeroes therein;
- and
- said odd and even subsequences each having no more than five consecutive zeroes therein;
- said number of bits in the encoded binary data having a ratio of 8/9 to the number of bits in codewords.
4 more elements
A method for encoding a preselectable number of bits of binary data into codewords having a preselectable number of bits, said method comprising the steps of:
- receiving the binary data;
- and
- encoding the binary data by producing sequences of codewords each having at least two interleaved odd and even subsequences from said binary data;
- said sequences of interleaved subsequences having no more than three consecutive zeroes therein;
- and
- said odd and even subsequences having no more than five consecutive zeroes therein;
- said number of bits in the encoded binary data having a ratio of 8/9 to the number of bits in the codewords.
4 more elements
Dependencies are inferred from the claim text.