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Displaying 1-10 of 10 articles from this issue
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Article type: Cover
Pages Cover1-
Published: December 11, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (14K) -
Article type: Index
Pages Toc1-
Published: December 11, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (37K) -
Tomoko Yasunari, Hideki Fukuda, Kazuhiko NakamuraArticle type: Article
Pages 1-8
Published: December 11, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis report proposes an algorithm of realtime variable bit rate video coding for DVD-RAM recorder. In this algorithm, we prepare extra amount of bits in addition to the target bits at the start of the coding. And we carry out the video coding that the bit allocation is depend on the difficulties of the images in the range of the extra bits. Moreover, we propose a new method that can improve the video quality in the case of fade-in/out.View full abstractDownload PDF (884K) -
Toshiyuki Nakagawa, Tatsuya Narahara, Yoshihide ShimpukuArticle type: Article
Pages 9-14
Published: December 11, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe proposed a new P-rmtr (1,7) code (P-rmtr : Prohibit rmtr) for Optical/Magueto-Optical disk systems. The P-rmtr (1,7) code, (d, k : m, n)=(1.7 : 2.3), has same paraneters as RLL (1,7) code and prohibit repeated minimum transition ruuleugth (rmtr). By the prohibited rmtr, the recording/playback performance at a high linear deusity is improved. In addition, when using a PR (1,1,1,1) ML, the pass of the covnentional RLL (1,7) code could not merge. However the P-rmtr (1,7) code can merge.View full abstractDownload PDF (551K) -
Tetsuya TsujiiArticle type: Article
Pages 15-21
Published: December 11, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThere are many kinds of the polymer material very much, and it is very much being used in the wide area. Moreover, polymer materials are the existence which can't be missed even if a real multimedia age is reached and it faces the large capacity storage media which keeps a movie, a voice, data. The property of all the material changes including the polymer mateial by temperature. The evaluation of thermal property and mechanical property is especially necessary for the polymer material. In this paper, I show the outline of DSC, TG, TMA and DMA, and introduce some examples of distinctive applications.View full abstractDownload PDF (717K) -
Takahiro KUROSAWA, Naoki HONDA, Kazuhiro OUCHIArticle type: Article
Pages 23-28
Published: December 11, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe recorded magnetization on the single layer perpendicular recording media was estimated from the readback waves by approximating the MR head to two ring heads. The increase of the transition length of magnetization causes the recording demagnetization at high M.M.F. writing. The baseline shift of the readback waves of MR heads was studied. The baseline shift is caused by 3-dimensional magnetic field effects and varing the recorded magnetization between write bits.View full abstractDownload PDF (598K) -
K. Ishikawa, M. Kishida, K. Kamijo, R. Taguchi, J. NumazawaArticle type: Article
Pages 29-34
Published: December 11, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA new equalizer for a perpendicular magnetic disk with commercial AMR head (R/W track width=1.6/2.1μm) was developed for using the PRML read channel. The transfer function of the perpendicular magnetic disk derived by Fourier analysis had a phase delay of 90 degrees from that of the longitudinal magnetic disk. The waveform was equalized into the 90-degree phase leading waveform that satisfied Nyquist's first criterion by the transfer function of the simulation. A byte error rate (BER) of under 1.0×10^<-7> was obtained at 242 kfci using the excellent simple RC (Resistor-Capacitor) circuit corresponding to the function of the simulation. The bit rate was 57Mbps. Non-linear transition shift (NLTS) of the perpendicular magnetic disk written by a ring head was also investigated. This NLTS was higher at higher linear density like that of a longitudinal magnetic disk.View full abstractDownload PDF (626K) -
Shin Tomimoto, Takao Sugawara, Hiroshi MutohArticle type: Article
Pages 35-42
Published: December 11, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSImprovements in areal density and data transfer rate have been the chief driving force behind the historic improvement in the hard disk storage. With increase a linear bit density and a data transfer rate, the influence of a non-linear transition shift (NLTS) and a media noise will be a couple of principal deterioration factors in read back signal. In this paper, we propose the new model for error rate simulation on the NLTS and the media noise respectively.View full abstractDownload PDF (673K) -
Shoichiro Ogawa, Keigo Majima, Toshihiro Uehara, Junji NumazawaArticle type: Article
Pages 43-48
Published: December 11, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper reports a new method for quantitative analysis of the nonlinear transition shift using magnetic force microscopy (MFM) in the recording medium. Alt earlier methods of measuring the nonlinear transition shift which occurs during high density magnetic recording have been based on a play back signal, making it impossible to confirm the shift during the actual recording. In this study, the recording current and recording bit length characteristics of the nonlinear transition shift on metal particle tape were measured by the proposed new method. The results were very similar to those obtained by the dipulse measuring method.View full abstractDownload PDF (613K) -
Article type: Appendix
Pages App1-
Published: December 11, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (73K)
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