Zobrazeno 1 - 10
of 113
pro vyhledávání: '"DVD-RAM"'
Autor:
Masahisa Shinoda, Hidehiko Nakatani
Publikováno v:
Optical Review. 22:264-270
We theoretically calculate the behavior of the focusing error signal in the land-groove-type optical disk when the objective lens traverses on out of the radius of the optical disk. The differential astigmatic method is employed instead of the conven
Autor:
Nobuhiro Tokushuku, Akemi Hirotsune, Miyamoto Makoto, Motoyasu Terao, Yasushi Miyauchi, Reiji Tamura
Publikováno v:
Japanese Journal of Applied Physics. 46:7749-7754
To obtain minimum overwrite jitter after 104 overwrites, the cause of degradation of readout waveforms after 104 overwrites was investigated by transmittance electron microscopy (TEM). To decrease the temperature of the recording film at the track ce
Autor:
Reiji Tamura, Nobuhiro Tokushuku, Miyamoto Makoto, Yasushi Miyauchi, Motoyasu Terao, Akemi Hirotsune
Publikováno v:
Japanese Journal of Applied Physics. 46:6652-6657
A Ag–Ge–Sb–Te recording film was developed, and its chemical composition was optimized to minumize overwrite jitter. The cause of the jitter was investigated by measuring the crystallization ratios and by transmission electron microscopy. It wa
Publikováno v:
Chinese Physics Letters. 22:2269-2272
We investigate a new structure of high-power 660-nm AlGaInP laser diodes. In the structure, a p-GaAs layer is grown on the ridge waveguide serving as the current-blocking layer, and nonabsorbing windows are only fabricated near the cavity facets to i
Publikováno v:
IEE Proceedings - Science, Measurement and Technology. 150:207-210
Time-resolved phase-change experiments were carried out on the same sample with a violet and a red wavelength configuration of a two-laser static disk-tester. The experiments revealed qualitatively completely different reflectivity dynamics for the t
Publikováno v:
Japanese Journal of Applied Physics. 41:1719-1723
A mixed-mode optimum power calibration (MOPC) method on CD-recordable/CD-ReWritable discs in a CD-R/RW drive is proposed. The MOPC procedure conducts the recording power calibration procedure at areas not only at the inner most radius but also at the
Publikováno v:
IEEE Transactions on Consumer Electronics. 47:528-533
A new actuator control technique for an 8 cm DVD-RAM drive, used for a video camera recorder, was developed. The new technique consists of the acceleration feed forward control (AFFC) and the velocity feed back control (VFBC). Suppressing external di
Autor:
T. Ochi, Akira Matsuzawa, N. Mimura, S. Gotoh, K. Aida, Y. Tai, M. Usui, K. Komichi, T. Maeda, T. Nakajima, Y. Okamoto, K. Irie, Tetsuo Yamamoto, T. Takahashi, K. Ohshima, K. Sushihara
Publikováno v:
IEEE Journal of Solid-State Circuits. 36:1785-1794
This paper describes a fully integrated single-chip CMOS mixed-signal system on a chip (SoC) for DVD RAM and ROM systems. It integrates a 32-b RISC CPU, formatter, servo digital signal processor (DSP), 16-Mb DRAM, error correction code (ECC), ATA int
Publikováno v:
IEEE Transactions on Consumer Electronics. 45:1284-1289
We have developed techniques to read DVD-RAM discs with DVD-ROM drives. The key techniques are the reduction of feedthrough in the focusing error signal, the reduction of the push-pull signal offset, and the half tracking jump function.
Publikováno v:
IEEE Transactions on Magnetics. 34:337-342
DVD-RAM requires a large storage capacity to write and read huge amounts of data such as MPEG2 and AV as well as computer data for full-scale multi-media applications. Its format is focused on unifying AV and computer files, and achieving read compat