• Title/Summary/Keyword: dvd

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A study on the implementation of a digital video/audio system to support multi-audio format (다양한 오디오 포맷을 지원하는 비디오/오디오 시스템 구현에 관한 연구)

  • Park In-Gyu
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.43 no.4 s.310
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    • pp.123-132
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    • 2006
  • In this paper, the digital video and audio system is improved so that various digital video data formats in DVD disc, and digital audio data formats through the S/PDIF ports may be decoded. It is not easy to implement all decoding functions of video and audio by a DVD processor. The special structure in audio decoding circuit is proposed in this system so as to have simultaneously almost same video and audio performance in quality. By dividing the decoding circuit separately into video and audio part, the audio quality can be dramatically improved together with supporting several audio formats and with several effects. In order to satisfy the perfect audio system to support to audio decoding formats, it is just enough to get the expensive, complicated decoder. However, it may be not easy to get this expensive decoder in near future. Therefore it is rather to adopt the downloading method by which the host should download the appropriate code into memory by detecting the corresponding audio bit streams. It is proved that this method may be efficient in the point of sharing resource of audio data for video decoding.

Study on the design optimization of injection-molded DVD-Tray parts using CAE Simulation (플라스틱 DVD-Tray의 박막 사출성형을 위한 최적화 설계 Simulation에 관한 연구)

  • Chung, Jae-Youp;Kim, Dong-Hak
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.6
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    • pp.1726-1732
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    • 2008
  • Injection molding is one of plastic forming technology which can easily mass-produce plastic parts with various and even complex shape. The technology has lots of difficulties in making a good part due to phase change of material, high applied pressure, and fast melt flow speed in the cavity. To overcome the problems, they had to make trial and error method until the CAE(Computer Aided Engineering) could be a tool for concurrent engineering. In this paper, we investigate the optimal design for a plastic DVD tray part by systematic approach of the commercial CAE program. In design, we should consider two objectives which are both dimensional stability and cost-down. The dimension of the part is crucial because the tray should carry a DVD correctly, but the part is too thin to injection-mold easily. In order to improve the moldability, the mold is designed in the form of stack mold which is a kind of 4 hot runner system. In first, we changed the stack-mold system with one hot-runner to cost down, and decided the optimal position of the gate. After that, we investigate the effect of both the layout of cooling channels and the cooling temperature on the shrinkage of the DVD tray. A optimal simulation approach, the gate design is 2Gate#3 and the layout is Case2 cooling line as the optimal temperature of $70^{\circ}C$. The Moldflow and PC+ABS are used for the CAE program and material respectively.

FPGA Implementation of an FDTrS/DF Signal Detector for High-density DVD System (고밀도 DVD 시스템을 위한 FDTrS/DF 신호 검출기의 FPGA 구현)

  • 정조훈
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.10B
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    • pp.1732-1743
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    • 2000
  • In this paper a fixed-delay trellis search with decision feedback (FDTrS/DF) for high-density DVD systems (4.7-15GB) is proposed and implemented with FPGA. The proposed FDTrS/DF is derived by transforming the binary tree search structure into trellis search structure implying that FDTrS/DF performs better than the singnal detection techniques based on tree search structure such as FDTS/DF and SSD/DF. Advantages of FDTrS/DF are significant reductions in hardware complexity due to the unique structure of FDTrS composed of only one trellis stage requiring no traceback procedure usually implemented in the Viterbi detector. Also in this paper the PDFS/DF and SSD/DF orginally proposed for high-density magnetic recording systems are modified for the DVD system and compared with the proposed FDTrS/DF. In order to increase speed in the FPGA implementation the pipelining technique and absolute branch metric (instead of square branch metric) are applied. The proposed FDTrS/DF is shown to provide the best performance among various signal detection techniques such as PRML, DFE, FDTS/DF and SSD/DF even with a small hardware complexity.

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Fabrication of a Low Power Parallel Analog Processing Viterbi Decoder for PRML Signal (PRML 신호용 저 전력 아날로그 병렬처리 비터비 디코더 개발)

  • Kim Hyun-Jung;Son Hong-Rak;Kim Hyong-Suk
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.43 no.6 s.348
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    • pp.38-46
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    • 2006
  • A parallel analog Viterbi decoder which decodes PRML signal of DVD has been fabricated into a VLSI chip. The parallel analog Viterbi decoder implements the functions of the conventional digital Viterbi decoder utilizing the analog parallel processing circuit technology. In this paper, the analog parallel Viterbi decoding technology is applied for the PRML signal decoding of DVD. The benefits are low power consumption and less silicon consumption. The designed circuits are analysed and the test results of the fabricated chip are reported.

Motivating Underserved Vietnamese Americans to Obtain Colorectal Cancer Screening: Evaluation of a Culturally Tailored DVD Intervention

  • Lee, Hee Yun;Tran, Marie;Jin, Seok Won;Bliss, Robin;Yeazel, Mark
    • Asian Pacific Journal of Cancer Prevention
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    • v.15 no.4
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    • pp.1791-1796
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    • 2014
  • Background: Colorectal cancer (CRC) is a leading cause of cancer death among Vietnamese Americans, yet screening remains underutilized. We investigated the effectiveness of a culturally tailored DVD intervention in promoting CRC screening among unscreened Vietnamese Americans age 50 and over. Materials and Methods: Using a community-based participatory research approach, we conducted a trial comparing twenty-eight subjects who received a mailed DVD in Vietnamese, with twenty-eight subjects who received a mailed brochure in Vietnamese. Subjects completed telephone surveys at baseline, One-month, and one-year. The primary outcome was receipt of screening. Secondary measures were participants' knowledge, attitudes, and beliefs about CRC screening. Two focus groups explored the intervention's acceptability and effectiveness. Results: At one year, CRC screening rates of 57.1% and 42.9% were observed in experimental and control group respectively (p=0.42), Subjects in both groups showed increased knowledge about CRC after one month. Focus group findings revealed that the DVD was an effective method of communicating information and would help promote screening. Conclusions: The findings suggest that culturally tailored, linguistically appropriate content is more important than the type of media used. This relatively low intensity, low cost intervention utilizing a DVD can be another useful method for outreach to the often hard-to-reach unscreened population.

A Study on Quality of Bibliographic Records for DVDs in University Libraries (대학도서관의 DVD자료 목록레코드 품질에 관한 연구)

  • Kim, Woo-Jeong;Lee, Ji-Won;Cho, Yong-Wan
    • Journal of the Korean BIBLIA Society for library and Information Science
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    • v.28 no.4
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    • pp.77-100
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    • 2017
  • The aim of this study is to evaluate quality of the bibliographic records for DVDs owned by the domestic university libraries and to suggest how to improve the problems as a result of the evaluation. In order to conduct this study, the previous studies related to the topic were analyzed, and then, four regions of quality evaluation standard including accuracy of inputting, observance of regulations related to cataloging, perfection of expressions and consistency of structure were established. And the quality evaluation was made on total 100 records of the lists for DVDs from 10 university libraries. As a result, several types of errors were discovered in the quality evaluation and some solutions were suggested to improve quality of cataloging records for DVDs by interviewing with catalogers in the domestic university libraries.

A Document Management System That Can Handle over Terabyte Order Data - An Integration of Self Organized Picture Search, 3D Graphics and DVD Changer Control Technology - (테라바이트급 데이터를 축적.검색표시할 수 있는 문서관리 시스템 - 3D 그래픽과 화상검색 및 DVD 체인저 제어기술의 융합 -)

  • Yoshihiro, Mori;Hiroyuki, Nitta;Mitsuji, Inoue;Koji, Kimura;lzuru, Shimamoto;Hiroharu, Ito;Atsushi, Kitamachi
    • Journal of Information Management
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    • v.32 no.1
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    • pp.108-119
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    • 2001
  • Creating digital document by scanning paper or using a digital camera or using a computer is a daily task at every office. Digital document is increasing at high pace. The quantity of digital document is almost beyond the maximum capacity of the online storage and is destroying searching efficiency. To solve these problems, we developed a document management system(ChronoStar) by integrating various searching methods(Picture, Full-Text Related), 3D graphic and a DVD changer.

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FPGA Implementation of an FDTrS/DF Signal Detector for High-density DVD Systems (고밀도 DVD 시스템을 위한 FDTrS/DF 신호 검출기의 FPGA 구현)

  • 조잉섭;조용수
    • Proceedings of the IEEK Conference
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    • 2000.09a
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    • pp.741-744
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    • 2000
  • 본 논문에서는 고밀도 DVD(Digital Versatile Disc) 시스템(4.7GB~l5GB)을 위한 신호 검출기법을 제안하고 FPGA로 구현한다. 본 논문에서 제안하는 FDTrS/DF (Fixed Delay Trellis Search with Decision Feedback)는 트렐리스 구조를 사용하므로 FDTS/DF나 SSD/DF(Signal Space Detection with Decision Feedback)와 같이 이진 가지 구조를 사용하는 신호검출방식에 비해 더 나은 성능을 얻을 수 있다. 또한 FDTrS/DF는 한 단의 트렐리스 구조를 사용해 역추적을 하지 않으므로 하드웨어의 복잡도와 속도면에서 향상된 결과를 얻을 수 있다. 또한 본 논문에서는 하드웨어 구현 시 동작 속도의 향상을 위해 파이프라인 기법과, 계산량 감소를 위해 절대값 분기거리를 사용한다.

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Effect of Insulation Layer on Birefringence and Land-groove Pattern in DVD-RAM Substrate (단열층이 DVD 기판의 복굴절 및 전사성에 미치는 영향)

  • Kim, Y.;Seong, K.;Kang, S.
    • Proceedings of the KSME Conference
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    • 2001.06c
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    • pp.432-437
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    • 2001
  • It is necessary to improve mechanical and optical porperties in the optical disk substrates as the information storage devices with high storage density using blue laser are being developed. Injection compression molding is regarded as the most suitable process to manufacture optical disk substrates for quality recording and read-out. In the present research, the effects of processing conditions and the insulation layer thickness on gapwise birefringence and the land-groove pattern were investigated. It was found that the values of the birefringence distribution were very sensitive to mold temperature history, and the level of birefringence reduced and, furthermore, the quality of replication was improved due to the insulation layer.

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