Toshifumi Takeuchi
Hitachi
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Toshifumi Takeuchi.
international conference on consumer electronics | 1999
Hiroshi Yoshiura; L. Echizen; Takao Arai; Hiroyuki Kimura; Toshifumi Takeuchi
This paper proposes a novel control module that can be incorporated in a wide range of digital watermarking systems and that controls system watermarking processes to preserve picture quality.
international conference on consumer electronics | 1994
Osamu Kawamae; Toshifumi Takeuchi; Izumi Kimura; Yutaka Nagai; M. Nishioka
A high speed digital signal processor for a quadruple speed CD-ROM has been developed. It has an enhanced error correction capability and a short defect recovery time. >
international symposium on consumer electronics | 1997
Toshifumi Takeuchi; K. Hirose; J. Nakajima; M. Hirabayashi; Y. Nagai; Y. Ueki; J. Azuma; H. Endoh; A. Fukushima
2/spl times/ DVD-ROM drive has been developed under with a rate of 2.76 MB/s, double the speed of regular DVD data transfer, and low data jitter is realized by a high bandwidth equalizer (HBW EQ). A 4 Mbits SDRAM (synchronous D-RAM) is introduced as the buffer memory in order to process for data both the 2/spl times/ speed DVD-ROM and the DVD video player.
international conference on consumer electronics | 1995
Masafumi Nakamura; Toshifumi Takeuchi; H. Suzuki; Susumu Yoshida; N. Imada; J. Nakajima; Masayuki Inoue; K. Kafuku; S. Doi
A prototype of a high density digital video disc player which employs a variable bit rate system has been developed. It can reproduce high quality video signal with a maximum data rate of 7.5 Mbps for 2 hours. >
international conference on consumer electronics | 1992
Masafumi Nakamura; Toshifumi Takeuchi; Takao Arai; Yuji Hatanaka; Shigeru Yamazaki; Tadasu Ohtsubo
A digital audio system for a consumer high-definition (HD) video cassette recorder (VCR) was developed. The HDVCR, called HD video, used half-inch-wide tape. The digital audio system realized a superb audio quality. The digital audio system for HD video is described. The protection of reproduced data against errors in the synchronization signal and the block address was studied. The recording and reproducing characteristics are discussed. >
international conference on consumer electronics | 1991
Toshifumi Takeuchi; Masafumi Nakamura; Nobutaka Amada; Yuji Hatanaka; Kooei Usuda; Takao Arai; Takaharu Noguchi
The recording and reproducing characteristics of the PCM (pulse code modulation) audio signal, reduction of interference to the video signal by the PCM audio signal, and performance against tracking error have been studied on a digital audio system for S-VHS VCR (video cassette recorder). A block error rate of 5*10/sup -4/ is attained without degradation of both video and FM audio signals. Amorphous heads have been used for both video and audio heads and the PCM signal carrier-to-noise ratio of 19 dB in the EP mode has been obtained without degradation of the video signal. It is confirmed that the uncorrectable error rate is under 1 symbol/second even in the case of a tracking error of -20 mu m to 9 mu m in the EP mode. >
Archive | 1996
Masayuki Hirabayashi; Hideaki Suzuki; Masafumi Nakamura; Yutaka Nagai; Toshifumi Takeuchi
Archive | 2000
Yasushi Fukuda; Toshifumi Takeuchi; Nobuhiro Tokushuku
Archive | 1998
Hiroyuki Kimura; Takao Arai; Toshifumi Takeuchi; Hiroshi Yoshiura
Archive | 1996
Yutaka Nagai; Masafumi Nakamura; Toshifumi Takeuchi; Masayuki Hirabayashi
