Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1991-09-19
1994-06-28
Sniezek, Andrew L.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
358342, 360 191, 360 351, 369 54, G11B 700
Patent
active
053253477
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a recording method and a reproducing apparatus for compressed data which are continuous data compressed in time. More particularly, it relates to a method for continuously recording data on a disc-shaped recording medium which is rotationally driven at a velocity higher than the rotational velocity of a disc corresponding to the transfer rate of recording data, and a method for reproducing data continuously recorded on the disc-shaped recording medium.
BACKGROUND ART
Conventionally, in a disc apparatus, such as a CD player for reproducing a compact disc (DC) having concentric tracks in which digital audio data are recorded as a train of pits, a laser beam is irradiated along a track on the disc driven by a spindle motor at a constant linear velocity (CLV), and the digital audio data are reproduced by detecting changes in the intensity of the reflected light caused by the presence or absence of the pits.
Although the bit error rate during data reproduction may reach a value in an order of 10.sup.-5, an error correcting operation is performed with the acid of error detection and error correction codes to obviate any inconveniences which might otherwise arise under usual operating environments.
Meanwhile, in a CD player provided with an optical reproducing head, it is a frequent occurrence that the servo systems such as the focusing servo or tracking servo for the reproducing head is out of order so that regular data playback cannot be achieved. In such case, error correction cannot be made even with the use of the error detection or error correction code, so that data playback is discontinued transiently.
In a car-laden or portable CD player, which may be subjected to extremely large impacts or vibrations in a manner different from a stationary CD player for domestic use, a mechanical vibration proofing system is provided to prevent the servo system from falling into disorder in the above described manner.
On the other hand, in a so-called CD-I(CD-Interactive) system in which video data and letter or character data are recorded simultaneously on the compact disc (CD) in addition to the audio information, seven modes as shown in FIG. 1 are standardized as audio information.
In the CD-DA mode in which the sound quality level corresponds to the current 16-bit PCM, linear pulse code modulation (PCM) with the sampling frequency of 44.1 Khz and the number of bits of quantization equal to 16, is employed. In the A level stereo mode and the A level monaural mode having the sound quality corresponding to the long-playing record, adaptive differential pulse code modulation (ADPCM) with the sampling frequency of 37.8 kHz and the number of bids of quantization equal to 8, is employed. In the B level stereo mode and the B level monaural mode having the sound quality corresponding to FM broadcasting, ADPCM with the sampling frequency of 37.8 kHz and the number of bits of quantization equal to 4, employed. Finally, in the C level stereo mode and the C level monaural mode, having the sound quality corresponding to the AM broadcasting, ADPCM with the sampling frequency of 18.9 Khz and the number of bits of quantization equal to 4, is employed.
That is, turning to FIG. 1, in the A level stereo mode, as contrasted to the CD-DA mode, the bit reduction ratio is 1/2 and data are recorded at every two sectors (represents a sector where data recording in made) with the reproducing time for a disc being about two hours. In the A level monaural mode, the bit reduction rate is 1/4 and data are recorded at every four sectors, with the reproducing time being about four hours. In the B level monaural mode, the bit reduction ratio is 3/8 and data are recorded at every eight sectors, with the reproducing time being about eight hours. In the C level stereo mode, the bit reduction ratio is 1/8 and data are recorded at every eight sectors, with the reproducing time being about eight hours. In the C level monaural mode, the bit reduction ratio is 1/16 and data are recorded at every sixteen sectors,
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Sniezek Andrew L.
Sony Corporation
Tran Thang V.
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