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26.31
Displaying 1-9 of 9 articles from this issue
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Article type: Cover
Pages Cover1-
Published: March 20, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (12K) -
Article type: Index
Pages Toc1-
Published: March 20, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (28K) -
Kenichi TSUCHIDA, Koichiro TAKAHASHI, Kazuki KUMAGAIArticle type: Article
Session ID: BCS2002-8
Published: March 20, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSTerrestrial broadcasts are difficult to receive in areas where their broadcast waves are obstructed by high buildings. In these areas, we installed a gap filler (GF) station and examined reception characteristics when a digital broadcast signal was re-transmitted from the GF station at the same frequency as that of the main station. In the area where waves transmitted from the GF station could make a disturbance, a margin to the minimum receiving power was reduced. By pointing the receive antenna in the direction of the GF station, the margin was improved in these areas.View full abstractDownload PDF (897K) -
Satoshi KIMURA, Hiroshi FUJISAWA, Michihiro UEHARA, Shigeki MORIYAMAArticle type: Article
Session ID: BCS2002-9
Published: March 20, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe digital terrestrial broadcasting can provide data broadcasting services through DSM-CC data-carousel in the same way as the BS digital broadcasting. In DSM-CC, it is possible to set flexibly pattern of carousel transmission, such as a size of module and a repetition period. This paper describes the composition method of data-carousel that makes the retrieval time in receiver shorter against hostile transmission conditions of mobile reception.View full abstractDownload PDF (565K) -
Kenji MATSUO, Koichi TAKAGI, Atsushi KOIKE, Syuichi MATSUMOTOArticle type: Article
Session ID: BCS2002-10
Published: March 20, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMPEG-4 FGS enables video decoding at variable bit rate scalability, and enables video transmission with high adaptation to bandwidth change on network. However, the bit plane coding method of FGS has the problem that the coding efficiency falls in lower plain. Then, in this paper, we propose a new method for improving the efficiency of the bit plane coding. First, each bit is classified into two groups based on the distribution of significant coefficients. Next, the optimal coding method is applied to each group. Moreover, each information bit is coded in the order which contributes to image quality. Simulation results show that this proposed method is superior to FGS in coding efficiency, and 0.2dB in PSNR.View full abstractDownload PDF (1197K) -
Gouichi ISHIHARA, Sei NAITO, Koichi TAKAGI, Masahiro WADA, Shuichi MAT ...Article type: Article
Session ID: BCS2002-11
Published: March 20, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDigital terrestrial TV broadcasting services will start on the year 2003 in Japan. In these services, the available bit-rate for the secondary distribution of the typical HDTV services may be limited at 11 to ISMbps, thus the sufficient picture quality cannot be achieved for any video sequences with high complexity when the conventional MPEG-2 based encoding scheme is applied. In this paper, an optimal quantization control which applies a visual weighting factor evaluation for each macroblock is proposed in order to improve picture quality improvement at a quite low bit-rate. In addition, it was confirmed that the calculation of a visual weighting factor assigned for each macroblock can be conducted precisely by taking the result of the video object pre-analysis and the macroblock texture type into account.View full abstractDownload PDF (1242K) -
Yoshimichi OTSUKA, Sei NAITO, Hideki INOMATAArticle type: Article
Session ID: BCS2002-12
Published: March 20, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSBS digital broadcasting was turned to practical use and terrestrial digital broadcasting is prepared the ground for beginning. In this social background, aiming to enrich the digital broadcasting services, we are researching on lower bitrate coding of HDTV signals. We improve the coding algorithms in encoders (sides with TV stations). Utilizing the 1125/60 interlaced HDTV signals for inputs and the MPEG-2 syntax standard for coding, we aim the beat coding algorithm for the practical use of the digital broadcasting at bitrates of 11 to 15Mb/s. The paper describes some picture quality improvement methods to realize our aim.View full abstractDownload PDF (1042K) -
Article type: Appendix
Pages App1-
Published: March 20, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (75K) -
Article type: Appendix
Pages App2-
Published: March 20, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (75K)
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