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Error Location Pointing Analysis

IP.com Disclosure Number: IPCOM000082093D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Hinz, HC: AUTHOR

Abstract

In enhancing operation of error correction codes as taught in U. S. Patent 3,639,900, selection of appropriate error location pointers is extremely important. Various types of error location pointers can be generated. In both single and multiple-track recorders, it is most advantageous to employ the most reliable pointers to the exclusion of lesser reliable pointers. Accordingly, all error location pointers determined by an error correction code apparatus itself, or by unambiguous record format-error indicating deviations are most preferably first used. This first class of error location pointers are effectively mathematically determined; hence, are always rigorous.

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Error Location Pointing Analysis

In enhancing operation of error correction codes as taught in U. S. Patent 3,639,900, selection of appropriate error location pointers is extremely important. Various types of error location pointers can be generated. In both single and multiple-track recorders, it is most advantageous to employ the most reliable pointers to the exclusion of lesser reliable pointers. Accordingly, all error location pointers determined by an error correction code apparatus itself, or by unambiguous record format-error indicating deviations are most preferably first used. This first class of error location pointers are effectively mathematically determined; hence, are always rigorous.

If such highly accurate and reliable error location pointers are not available, the class next most reliable pointers in recording systems (particularly, the run- length limited type as contemplated in U. S. Patent 3,639,900) is a wavelength error; that is, a wavelength exceeding

If such highly accurate and reliable error location pointers are not available, the class next most reliable pointers in recording systems (particularly, the run- length limited type as contemplated in U. S. Patent 3,639,900) is a wavelength error; that is, a wavelength exceeding or less than the permitted wavelengths.

The third class of pointers which are used only if either of the first two classes are not available, includes the utilization of signal quality pointers. Such signal quality po...