Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1995-05-24
1997-04-22
Hindi, Nabil
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 54, 369 53, G11B 700
Patent
active
056234597
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a data reproducing method and a data reproducing apparatus suitable when used in an optical disc apparatus or a magneto-optical disc apparatus adapted for reproducing picture data or speech data recorded on a disc, e.g., an optical disc or a magneto-optical disc, etc.
BACKGROUND ART
As an optical disc apparatus adapted for reproducing moving picture data or speech data recorded on a recording medium such as an optical disc, etc. by a picture compressing method in conformity with a predetermined standard, e.g., MPEG (Moving Picture Experts Group), etc., there is, e.g., an apparatus disclosed in the specification and drawings of EUROPEAN PATENT APPLICATION publication number: 0 522 853 A2 (Date of publication of application 13 January 1993. Bulletin 93/02) which has already field by the applicant of this application.
Namely, as shown in FIG. 1, in this optical disc apparatus, pick-up 2 irradiates laser beams onto optical disc 1 to reproduce, e.g., picture data recorded on optical disc 1 from its reflected light. Data that pick-up 2 outputs is inputted to demodulating circuit 3, at which it is demodulated. Moreover, output of pick-up 2 is inputted also to PLL (Phase Locked Loop) circuit 9. Thus, clock is extracted. This clock is sent to demodulating circuit 3 and sector detecting circuit 4. The data demodulated by the demodulating circuit 3 is inputted to error processing (ECC: Error Check and Correction) circuit 6 through sector detecting circuit 4.
In this example, sector detecting circuit 4 detects sector No., i.e., address allocated to sector of optical disc 1 from data demodulated at demodulating circuit 3 to output it to control circuit 31. Moreover, the sector detecting circuit 4 is operative so that when it fails to detect, e.g., sector No., or when even if it can detect those numbers e.g., are not continuous, it outputs sector No. abnormal condition signal to track jump judging circuit 7.
ECC circuit 6 detects data error from data delivered from demodulating circuit 3 through sector detecting circuit 4 to carry out error correction by using parity bit added to that data. Further, ECC circuit 6 is operative so that when it fails to correct error of data, it outputs error generation signal to track jump judging circuit 7. The error corrected data is delivered from ECC circuit 6 to ring buffer memory 5 for track jump, and is stored thereinto in accordance with control by control circuit
The control circuit 31 reads addresses every respective sectors of optical disc 1 from output of sector detecting circuit 4 to designate write address, i.e., write point (WP) for storing data from ECC circuit 6 into ring buffer memory 5 in correspondence with that address. Moreover, the control circuit 31 designates read-out address, i.e., reproduction point (RP) of data written in ring buffer memory 5 on the basis of code request signal from video code buffer memory 10 of decode section 20 of the succeeding stage. Then, the control circuit 31 reads out data from the reproduction point (RP) to deliver the data thus read out into video code buffer memory 10 to store it thereinto.
Data stored in the video code buffer memory 10 is transferred to inverse VLC circuit 11 on the basis of code request signal from inverse VLC (Variable Length Coding) circuit 11 of the stage succeeding thereto. The inverse VLC circuit 11 allows data inputted thereto to undergo inverse VLC processing, whereby when inverse VLC processing of the inputted data is completed, it outputs that data to inverse quantizing circuit 12, and outputs code request signal to video code buffer 10 to make a request for input of new data. Further, the inverse VLC circuit 11 respectively outputs quantization step size and motion vector to inverse quantizing circuit 12 and motion compensating circuit 15.
The inverse quantizing circuit 12 inverse-quantizes inputted data in accordance with quantization step size delivered from the inverse VLC circuit 11 to output it to inverse DCT circuit 13. This inverse DCT (Discrete Cosine
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Akiyama Yoshiyuki
Iwamura Ryuichi
Masuda Shozo
Frommer William S.
Hindi Nabil
Sinderbrand Alvin
Sony Corporation
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