| タイトル | Augmented burst-error correction for UNICON laser memory |
| 本文（外部サイト） | http://hdl.handle.net/2060/19750017564 |
| 著者（英） | Lim, R. S. |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 1974-06-01 |
| 言語 | eng |
| 内容記述 | A single-burst-error correction system is described for data stored in the UNICON laser memory. In the proposed system, a long fire code with code length n greater than 16,768 bits was used as an outer code to augment an existing inner shorter fire code for burst error corrections. The inner fire code is a (80,64) code shortened from the (630,614) code, and it is used to correct a single-burst-error on a per-word basis with burst length b less than or equal to 6. The outer code, with b less than or equal to 12, would be used to correct a single-burst-error on a per-page basis, where a page consists of 512 32-bit words. In the proposed system, the encoding and error detection processes are implemented by hardware. A minicomputer, currently used as a UNICON memory management processor, is used on a time-demanding basis for error correction. Based upon existing error statistics, this combination of an inner code and an outer code would enable the UNICON system to obtain a very low error rate in spite of flaws affecting the recorded data. |
| NASA分類 | COMPUTER SYSTEMS |
| レポートNO | 75N25636
A-6090
NASA-TM-X-62442 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/189686 |
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