Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1984-10-23
1987-11-17
Richardson, Robert L.
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
369 32, 360 39, 358342, G11B 700
Patent
active
047078189
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a data transmission system for recording digital data other than conventional two-channel digital audio signals by use of the format of a digital disc on which, e.g., the two-channel digital audio signals are recorded.
BACKGROUND ART
A system using an optical type digital audio disc (called a compact disc) is a disc system which can reproduce stereophonic music of high quality. If digital data such as display data, program data or the like other than stereophonic music can be reproduced by this disc system, by equipping a display device, it is possible to realize an apparatus for reproducing visual information such as graphic diagrams and statistics, drawings by still pictures, and the like, and to realize a video game apparatus. In addition, by recording sound information and image information, it is possible to realize a complete art collection, a travellers' guide, education system, and the like by use of both information, so that the range of applications of compact disc systems can be extended. In this case, an amount of audio data which can be transmitted decreases since still picture data is recorded.
One of such reduction is a decrease in number of bits, namely, one sample consists of eight bits as compared with the existing compact disc in which one sample consists of sixteen bits. In other words, a dynamic range is reduced. For example, the dynamic range of 96 dB is obtained in case of 16 bits, while only the dynamic range of 48 dB is derived in case of eight bits. However, for this problem, a value of 60 dB or 78 dB or the like which is near the inherent dynamic range can be obtained using a D-PCM method or an analog compressing/expanding method.
Another problem relates to a decrease in transmission band due to reduced sampling data which can be transmitted. In the existing compact disc, the transmission band of 20 kHz is derived. However, the transmission band is reduced to about 10 kHz when the sampling data is reduced because of the recording of the still picture data. Even in this case, a large inconvenience for the reproduction of a voice will not be caused. However, the transmission band of about 15 kHz is desirable to reproduce a music.
It is an object of the present invention to provide a data transmission system which can reproduce digital data other than stereophonic music signals by use of the existing disc reproducing apparatus as it is.
DISCLOSURE OF THE INVENTION
This invention relates to a data transmission system using a digital disc whereby the even-number designated and odd-number designated digital data are interleaved and are recorded on the disc as signal tracks in the circumferential direction and are reproduced therefrom, wherein the same control data among the control data which are used for controlling the processing of the digital data is recorded at least twice at a predetermined interval.
According to the present invention, it is possible to prevent errors in the control data upon reproduction, thereby enabling the digital data to be accurately processed.
BRIEF DESCRIPTION OF DRAWINGS
FIGS. 1 and 2 are schematic diagrams which are used for explaining a data arrangement of recording data on a compact disc to which the present invention is applied;
FIGS. 3A and 3B are block diagrams showing an example of an encoder for error correction codes which are added to the data on the compact disc to which the invention is applied;
FIGS. 4A and 4B are block diagrams showing an example of a decoder corresponding to the encoder of FIG. 3;
FIGS. 5 and 6 are diagrams which are used for explaining the decoding operation of an error correcting decoder;
FIG. 7 is a block diagram showing the whole arrangement of an embodiment of the present invention;
FIGS. 8 and 9 are schematic diagrams showing an arrangement of one block and a part thereof when digital data in an embodiment of the invention is recorded;
FIGS. 10 and 11 are schematic diagrams which are used for explaining a graphic mode and a data arrangement of one block in th
REFERENCES:
patent: 4389681 (1983-06-01), Tanaka et al.
patent: 4397011 (1983-08-01), Ogawa
Nakamura Shoichi
Nishioka Hisao
Ohkubo Yutaka
Suzuki Tadao
Eslinger Lewis H.
Richardson Robert L.
Sinderbrand Alvin
Sony Corporation
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