Excavating
Patent
1984-11-07
1987-02-17
Smith, Jerry
Excavating
371 38, 371 39, 371 40, G06F 1100
Patent
active
046445447
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for correcting errors which is applied to the transmission of a digital information signal through a transmission path such as a recording medium, an optical fiber or the like.
BACKGROUND ART
In an optical digital audio disc (called a compact disc), the main channel consisting of a digital audio signal and a subchannel consisting of data for control, display or the like are recorded on spiral signal tracks. The processing for the error correction coding is performed with regard to the main channel and subchannel, respectively. Eight channels called P, Q, R, S, T, U, V, and W are defined in the subchannel. The P- and Q-channels among them are used for the selection of a program when the compact disc is played back. The display data or audio data is inserted in the other six channels of R to W. For example, the data for explaining a composer, performers and the like of music programs recorded in the main channel is recorded in the six channels of R to W.
The data in the subchannel includes control data such as indication of the kind of data actually recorded or instructions to process the data in the subchannel and the like. This control data is needed to indicate the subchannel or to accurately process the audio data, and its significance is higher than the display or audio data. Therefore, it is necessary to prevent errors from being included in the control data upon playback as possible. For instance, if only one bit of the control data becomes an error, the display data will have been erroneously processed as the audio data, so that this may cause a situation such that an abnormal sound is generated from a speaker.
As well as the data in the subchannel of the compact disc, there is a case where the kinds of data which are transmitted are not identical. For example, in a videotex system using a home use television receiver as a display device, there is a case where a control command is used as a special command other than commands representing fundamental elements in order to transmit graphic information through, e.g., existing telephone line network and optical transmission path.
DISCLOSURE OF THE INVENTION
This invention proposes an apparatus for correcting errors whereby in the case where different kinds of data are included in the data which are transmitted through the same transmission path, with respect to the more significant data, the error detection or error correction processing is commonly performed together with the other data, and at the same time the error correction decoding processing is carried out in the case where the peculiar error detection or error correction processing is executed.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 and 2 are schematic diagrams which are used for explaining a data arrangement of a compact disc in an embodiment of the present invention;
FIGS. 3A, 3B, and 4 are schematic diagrams which are used for explaining a subcoding signal of the compact disc;
FIGS. 5A, 5B, 6, 7A, and 7B are schematic diagrams which are used for explaining the font graphic mode by the subcoding signal;
FIGS. 8 and 9 are diagrams showing a parity check matrix for error correction codes and a reproduced data matrix in one embodiment of the invention;
FIG. 10 is a block diagram showing an arrangement of the recording system of one embodiment of the invention;
FIG. 11 is a block diagram showing an arrangement of the reproducing system of one embodiment of the invention;
FIG. 12 is a block diagram showing an arrangement of an error correcting encoder in one embodiment of the invention;
FIGS. 13, 14 and 15 are schematic diagrams which are used for explaining the interleave processing by the error correcting encoder;
FIG. 16 is a block diagram showing an arrangement of an error correcting decoder in one embodiment of the invention;
FIGS. 17A, 17B, and 18 are a flowchart and a table which are used for explaining the error correcting decoder shown in FIG. 16;
FIG. 19 is a block diagram showing an arrangement of an error correct
REFERENCES:
patent: 3988677 (1976-10-01), Fletcher
patent: 4276646 (1981-06-01), Haggard
patent: 4317201 (1982-02-01), Sedalis
patent: 4497058 (1985-01-01), Sako
Furuya Tsuneo
Hori Katsuya
Beausoliel, Jr. Robert W.
Eslinger Lewis H.
Smith Jerry
Sony Corporation
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