| Autor: |
Yong Hwan Kim, Jun Jin Kong, Byung Gook Chung, Sung Han Choi |
| Rok vydání: |
2002 |
| Předmět: |
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| Zdroj: |
TENCON '97 Brisbane - Australia. Proceedings of IEEE TENCON '97. IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications (Cat. No.97CH36162). |
| DOI: |
10.1109/tencon.1997.647265 |
| Popis: |
We describe the architecture of a Viterbi detector in a partial response maximum likelihood (PRML) system of high speed optical storage. In the high speed optical system (CDROM 30/spl times/ or DVD ROM/RAM 4.5/spl times/), the analog signal from an optical pick-up is far from an ideal response. We have regarded it as an intersymbol interference (ISI) and solve this problem with the PRML system including a Viterbi detector. Eight-to-fourteen modulation (EFM) and EFM+ code used in the DVD or CDROM, have a run length limited (RLL) characteristic, and its trellis diagram is different from the ordinary one. Several states and branches can be deleted. The Viterbi detector is designed for a 5 bit A/D converter up to a 120 MHz clock speed. A register exchange structure and a special overflow control logic are used for a high speed continuous input data stream. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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