Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1995-05-15
1998-03-03
Huber, Paul W.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 47, 369 58, G11B 1722, G11B 509, G11B 390
Patent
active
057243220
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
TECHNICAL FIELD
The present invention relates to an apparatus for recording and/or reproducing a recording medium. Particularly, the present invention relates to an apparatus for recording and reproducing a recording medium on which management information for recording or reproducing data is recorded together with data.
BACKGROUND ART
Recordable disk media, such as a magneto-optical disk or the like, can be accessed randomly with ease as compared with a tape-shaped recording medium, such as a DAT (Digital Audio Tape), a compact cassette tape or the like. Therefore, data need not be recorded from the inner peripheral side to the outer peripheral side of the disk in the correct order of a first track to an nth track. In other words, even when a piece of music is recorded on the disk at its physical random positions, if recorded address data of music recorded from the first to nth tracks are managed, then it is possible to reproduce music in the correct order.
Further, a track serving to record a piece of music need not always be recorded on consecutive segments (segment is referred to as a portion in which physically continuous data is recorded) and may be discretely divided into a plurality of segments and recorded on the disk.
In particular, in the system in which data read out from a magneto-optical disk is temporarily stored in a buffer memory at high transfer rate, read out from the buffer memory at a constant transfer rate and demodulated as an audio reproduced signal, even when reading of data from the magneto-optical disk is temporarily interrupted due to access between the segments, it is possible to continuously output the reproduced audio signal.
Accordingly, if recording and reproducing operation within the segment and high speed access operation, i.e., access operation which is ended within a reproducible time based on a data stored amount generated by a difference between a write data and a read rate of the buffer memory are repeated continuously, even when a track of a piece of music is physically divided into a plurality of segments, music can be recorded/reproduced satisfactorily.
As shown in FIG. 1, for example, although a first music is recorded as a segment M.sub.1 and a second music is recorded as a segment M.sub.2 continuously, it is possible to record fourth and fifth music separately on the disk as shown by segments M.sub.4(1) to M.sub.4(4) and M.sub.5(1) to M.sub.5(2). FIG. 1 is a schematic diagram and, in actual practice, it is frequently observed that one segment is recorded over several to several 100s of tracks or greater.
When music is recorded on and erased from the magneto-optical disk repeatedly, irregular empty regions occur on the track due to a difference between a playing time of recorded music and a playing time of erased music. However, if a discrete recording is executed as shown in FIG. 1, then it becomes possible to record music of which playing time is longer than that of the erased music by effectively using the erased portion. Therefore, it is possible to solve a problem of useless data recording area generated by repetitive recording/erasure. Incidently, recorded data is not limited to "music" and any kinds of audio signals may be recorded. In this specification, let it be assumed that music is recorded as data (track) of continuous one unit.
Upon recording, a recording is made on this disk while accessing segments forming a plurality of non-recording regions. Upon reproduction, segments should be accessed such that a piece of music is reproduced correctly. To this end, segments of a piece of music, such as data connecting M.sub.4(1) to M.sub.4(4) and data indicative of the non-recording region are held as U-TOC (user TOC, hereinafter simply referred to as U-TOC) which is rewritten at each recording or erasing operation. Under the control, the recording/reproducing apparatus reads this U-TOC information and allows the head to access the tracks so as to perform proper recording/reproducing operation.
As described above, the disk is provided with
REFERENCES:
patent: 5124963 (1992-06-01), Ando
Kondo Tsuyoshi
Mukawa Hiroshi
Huber Paul W.
Sony Corporation
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