Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1997-09-30
2000-03-14
Neyzari, Ali
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
3692754, G11B 724
Patent
active
060382082
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an information recording disc that records video and/or music information.
BACKGROUND ART
The problem conventional techniques and the invention try to solve is explained in the order of the following (1) single board optical disc and (2) two-disc bonded optical disc.
A so-called compact disc (CD) is well known as an optical disc that records a music signal by performing 44.1 kHz sampling and 16-bit quantization for a music signal audible band.
On the contrary, for an application in studios and so on, a music signal is recorded as a sampling frequency of 88.2 to 96 kHz and the number of quantized bits of 20 to 24 for up to an ultrasound band (approximately 20 to 50 kHz band) exceeding the music signal audible band. However, an expensive application apparatus is required for this recording and reproduction.
The art rejecting unimportant audible parts of sampling and quantized data for a music signal audible band, compressing irreversibly an original data with one kind of compression algorithm, and recording and reproducing on a recording medium the constant amount of information per apparatus time of music play time, is known.
The art compressing irreversibly an original data by using a video space correlation, using time correlation, and rejecting unnecessary visual data in relation to data of video signal sampling and amplitude quantization, is also known.
To compress irreversibly data like this, there are methods for making the amount of video information per apparatus time constant, and for changing the amount of video information per apparatus time depending on the video condition; both arts are known.
In addition, the art recording and reproducing irreversibly compressed data on an optical disc using the former method that makes the amount of video information per apparatus time constant, is known. Further, the art recording and reproducing on an optical disc irreversibly compressed data wherein the amount of information per apparatus time of video play time is changed depending on a video condition using the latter method for changing the amount of video information per apparatus time depending on a video condition, especially the art reproducing with buffer memory, pickup kick wait (regenerating wait operation), and search function, are known. To store a large amount of data efficiently, a hard disc drive (HDD) for use with a computer may record the data by compressing reversibly, with a naming such as so-called lossless compression and so on, and at reading, expand complementarily the data to be regenerated; this art is known.
Furthermore, the main art of a high-density optical disc recording video and/or music information at a density 3 to 8 times higher than that of a CD for general consumers, is known.
The art wherein a first area that is the inner side of an optical disc is a CD voice signal recording area, and a second area that is the outer side of the first area is a video signal recording area for recording at a high density a analog FM modulated video signal, is called CD-V (CD-VIDEO) and known.
Still, the disc wherein the first area that is the inner side of a high-density recording disc has CD recording density (low-recording density), and the second area of its outer side has high-recording density, is, for example, described in Japanese Patent Laid-Open No. 168449/1994 and known. A system is designed such that, against a low-density disc reading laser wavelength (780 nm ), a high-density disc is read with a short wavelength laser (635 nm). At this time, the pit depth of a disc is determined in relation to 0.25 times reading laser wavelength. In other words, it is suitable to make the pit depth of high-density disc shorter than that of a low-density disc.
Also, even if the pit depth is not defined as a standard, it is common that a reproducing signal characteristic with a standardized normal optical pickup is defined with a range; and the pit depth is defined equivalently with a range. Further, in general, the mechanical accuracy is reduced fo
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Nikkei Electronics, No. 630, Feb. 27, 1995 (Tokyo), Masaharu Takano, Mamoru Harada, "Digital Video Disc Japan's Challenge to Multimedia Age", pp. 87-100, partic. refer to Fig. 3 of p. 99.
AES-Preprint No-1549, p. 12.
Itonaga Makoto
Nishizawa Akira
Shikunami Juichi
Neyzari Ali
Victor Company of Japan Ltd.
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