Excavating
Patent
1988-05-12
1991-01-29
Smith, Jerry
Excavating
371 371, G06F 1100
Patent
active
049892118
ABSTRACT:
A data encoder is set to an initial condition by encoding preliminary symbols. The encoder is then used to encode the data to generate ECC symbols. The data and the generated ECC symbols are then recorded on a disk as code words. Thereafter, when a data code word is read it is again encoded in the initialized encoder to generate new ECC symbols. If the data read from the disk is one or more symbols out of synchronization, errors due to the initial condition will be found. The locations of the errors due to missynchronization will be in symbols corresponding to the initial condition, that is, in the preliminary symbols and beyond the boundary of the code word data, indicating the synchronization error. Alternatively, the locations of errors due to defects in the disk or misinterpretation of the data signal are within the code word data. Thus a missynchronization ofoneof more full symbols can be readily detected.
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D. Mandelbaum, "Synchronization of Codes by Means of Kautz's Fibonacci Encoding", IEEE vol. IT-18, No. 2, 3/1972, pp. 281-283.
Beausoliel Robert W.
Digital Equipment Corporation
Smith Jerry
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