정보저장시스템학회논문집 (Transactions of the Society of Information Storage Systems)
- 제1권2호
- /
- Pages.155-160
- /
- 2005
- /
- 1738-6845(pISSN)
- /
- 2288-2022(eISSN)
홀로그래픽 WORM의 하드웨어 채널 디코더
Hardware Channel Decoder for Holographic WORM Storage
- Hwang, Eui-Seok (Digital Signal Proc. R&D, DAEWOO Electronics Corp.) ;
- Yoon, Pil-Sang (Digital Media R&D, DAEWOO Electronics Corp.) ;
- Kim, Hak-Sun (Digital Media R&D, DAEWOO Electronics Corp.) ;
- Park, Joo-Youn (Digital Media R&D, DAEWOO Electronics Corp.)
- 발행 : 2005.12.01
초록
In this paper, the channel decoder promising reliable data retrieving in noisy holographic channel has been developed for holographic WORM(write once read many) system. It covers various DSP(digital signal processing) blocks, such as align mark detector, adaptive channel equalizer, modulation decoder and ECC(error correction code) decoder. The specific schemes of DSP are designed to reduce the effect of noises in holographic WORM(H-WORM) system, particularly in prototype of DAEWOO electronics(DEPROTO). For real time data retrieving, the channel decoder is redesigned for FPGA(field programmable gate array) based hardware, where DSP blocks calculate in parallel sense with memory buffers between blocks and controllers for driving peripherals of FPGA. As an input source of the experiments, MPEG2 TS(transport stream) data was used and recorded to DEPROTO system. During retrieving, the CCD(charge coupled device), capturing device of DEPROTO, detects retrieved images and transmits signals of them to the FPGA of hardware channel decoder. Finally, the output data stream of the channel decoder was transferred to the MPEG decoding board for monitoring video signals. The experimental results showed the error corrected BER(bit error rate) of less than