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Proceedings Paper

Video And Audio Disk File System
Author(s): Masatsugu Tanji; Ryoichi Imanaka; Yoshihiro Okino; Seizo Tsuji; Wataru Masuda
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Paper Abstract

A new disk format and a new recorder were developed, based on the still picture disk file system which was put on the market a few years ago, whereby a video disk system that permits concurrent continuous recording of video and audio signals has been developed. In order to achieve a prolonged. recording time, the disk track pitch was narrowed from the conventional 2.5 μm to 1.6 μm and a contrivance was also made circuit-wise to eliminate the resulting cross talk interference. Because of these innovations, 13.3 minutes (24,000 frames) of continuous recording is now realized on a disk 20 cm in diameter. For a continuous recording of sound signals, a continuous track is necessary. To solve this problem, a spiral track was developed in lieu of the conventional concentric track. To indicate addresses, this track is locally interrupted. Such interruptions would normally interfere with sound recording but such interferences could be prevented by selecting the optimum relation between, the length of interruptions and the sound carrier frequency.

Paper Details

Date Published: 12 April 1985
PDF: 10 pages
Proc. SPIE 0529, Optical Mass Data Storage I, (12 April 1985); doi: 10.1117/12.946441
Show Author Affiliations
Masatsugu Tanji, Disk Systems Development Center of Matsushita Electric Industrial Co. (Japan)
Ryoichi Imanaka, Disk Systems Development Center of Matsushita Electric Industrial Co. (Japan)
Yoshihiro Okino, Disk Systems Development Center of Matsushita Electric Industrial Co. (Japan)
Seizo Tsuji, Disk Systems Development Center of Matsushita Electric Industrial Co. (Japan)
Wataru Masuda, Disk Systems Development Center of Matsushita Electric Industrial Co. (Japan)


Published in SPIE Proceedings Vol. 0529:
Optical Mass Data Storage I
Robert A. Sprague, Editor(s)

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