KR19980050790A - Unauthorized copy-protected digital video disc recorder encoder - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

A digital video disc recording apparatus.

I. The technical problem that the invention is trying to solve

The present invention provides an encoder of a digital video disc recording apparatus capable of preventing unauthorized copying of data.

All. Summary of Solution of the Invention

The encoder of the digital video disc recording apparatus capable of preventing unauthorized copying of data is an encoder of the digital video disc recording apparatus, which processes all the data to prevent duplication of data before generating error detection parity with respect to the input video data. A register for temporarily storing copy related information transmitted from the main control unit of the digital video disk recording apparatus, and a copy prohibited data or copy related information from the secret communication unit or the register according to the type of data. It characterized in that it has a switch unit for selectively outputting.

la. Important uses of the invention

It is used to perform processing to prevent unauthorized copying of digital video disc data in the encoding step.

Description

Unauthorized copy-protected digital video disc recorder encoder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video (or versatile) disk recording apparatus in an optical recording apparatus, and more particularly to an encoder of a digital video (or versatile) disk recording apparatus capable of preventing unauthorized copying of data.

Digital video discs are one of the digital moving picture disc media, and are a next-generation high-definition, high-quality, high-end multimedia storage device that stores digital pictures of MPEG (Moving Picture Experts Group) 2 for more than two hours. Countermeasures against piracy are necessary unless the goal is free dissemination to the public, but digital video discs to date do not have such measures. Therefore, there is a problem that the information is exposed to ineligible persons, as well as difficult to protect the information that needs to be kept secret.

It is therefore an object of the present invention to provide an encoder of a digital video disc recording apparatus capable of preventing unauthorized duplication of data.

1 is a view showing a schematic configuration of a digital video disc recording apparatus according to an embodiment of the present invention;

2 is a diagram showing the configuration of an encoder of a digital video disc recording apparatus according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of one sector data sequentially output from the second switch unit of FIG. 2 and added with an error detection parity and rewritten to the first memory. FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. Also, in the following description, many specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a view showing a schematic configuration of a digital video disc recording apparatus according to an embodiment of the present invention.

The disk drive controller 400 controls the rotation of the disk 100. The disc motor 160 is rotated at a certain speed under the control of the disc drive controller 400. The head 120 provided in the optical pickup is for converting the information of the disk 100 into an analog high frequency (RF) signal and outputting the same. The channel coding unit 210 encodes the information to increase the reproduction and recording density. That is, the channel coding unit 210 modulates the input data 8-16 and outputs the data in a predetermined code form. The modulator 240 converts the encoded data into a data stream for recording on the disc 100. The error detection parity generator 230 generates parity to carry additional information so that the decoder can know whether or not an error exists. The error correction parity generator 250 generates parity to carry additional information to correct scattering and collection errors. The address generator 270 generates the physical address information of the disk to record data on the disk. The zone (or address) decoder 220 demodulates the disc characteristic related information previously stored in a specific area of the blank disc. The buffer controller 290 buffers data before and after the generation of the address or error detection parity, scramble, 8-16 modulation, or data stream modulation. The buffer controller 290 is also used to generate parity for error correction.

2 is a block diagram of a digital video disc recording device encoder according to an embodiment of the present invention.

The microcomputer interface unit 520 interfaces with the microcomputer 500 and the encoder 200 to exchange data or control signals with each other. The memory 310 is a memory for buffering data before and after each operation while performing general operations for encoding, and uses 4 megabit DRAM (DRAM). The memory 310 first stores MPEG-2 data for recording on the disc 100. The memory controller 320 generates an address for accessing the memory 310. The ID register 274 and ID_P (ID_Parity) generator 275 are included in the address generator 270 of FIG. 2 described above. The ID register 274 temporarily receives the ID from the microcomputer 500 through the microcomputer interface unit 520. The ID is physical address information of a disc on which data output from the memory 310 is to be recorded. The ID_P generation unit 275 generates a parity code, ID_P, for the ID input from the ID register 274 and combines it with the ID. The preliminary register 261 temporarily stores the duplication related information transmitted from the microcomputer 500 through the microcomputer interface unit 520, which is read and present in the form of 6-byte preliminary data of FIG. The first switch unit 264 selectively outputs one of the ID_P or the disc related information under predetermined control. The secret communication processor 400 performs various processing to prevent unauthorized duplication of the MPEG-2 data read from the memory 310. An example is the scrambling of data in a pre- promised manner with a legitimate player. Here, the duplication related information is for recognizing the fact of the processing and restoring the data in the predetermined manner when this information is detected by the disc reproducing apparatus. The second switch unit 266 selectively outputs one of the data passed through the secret communication processor 400 or the ID_P or disk related information output from the first switch unit 264. The error detection parity generator 230 requests data from the memory controller 320 to generate an error detection parity corresponding to data read from the memory 310. After the generation of the error detection parity, the scramble unit 268 converts the main data into random data by scrambling only the main data among the data received by the error detection parity generator 230 by the memory controller 320. do. The third switch unit 267 selectively outputs one of the error detection parity from the error detection parity generator 230 or the scrambled main data output from the scrambler 268 in synchronization with a predetermined clock, thereby providing a new type 1 in the memory 310. Switch to save sector data. FIG. 3 is a diagram illustrating a configuration of one sector data sequentially output from the second switch unit of FIG. 2 and added with error detection parity and rewritten to the first memory. Referring to FIG. 3, the third switch unit 267 first transfers 2,048 bytes of scrambled main data to the memory 310 by selecting the scrambler 268, and then switches to the error detection parity generator 230, as shown in FIG. Passes parity of bytes.

The error correction parity generator 250 is a (208, 192, 17), (182, 172, 11) parity generator. The horizontal direction is (182, 172, 11) and the vertical direction is (208, 192, 17). In the former case, 10 bytes of parity is added to 172 bytes of input data. In the latter case, 16 bytes of parity is input to 192 bytes of input data. Add In other words, the lengths of the codewords are 182 and 208, the main data excluding parity are 172 and 192, and the codeword intervals are 11 and 17, respectively. The memory 310 also buffers data while generating error correction parity in each direction and stores data for which parity has been added.

The error correction parity generator 250 accesses the memory 310 through the memory controller 320, reads the corresponding data, adds the error correction parity generated for the data, and stores the same in the memory 310.

The 8-16 modulator 214 and the synchronization generator 212 are included in the channel coding unit 210 of FIG. 2. The 8-16 modulator 214 requests data from the memory controller 320, reads data with error correction parity from the memory 310, and performs 8-16 modulation in accordance with a predetermined synchronization signal provided by the synchronization generator 212. Non-Return to Zero, Inverted (NRZI) Modulator 247 and Laser Power (LP). Modulator 245 is included in the modulator of FIG. . In order to record a channel coded data stream on a disc, magnetic field modulation or light modulation is required depending on the material of the disc. Magnetic field modulation is used to record on magnetic disks, and optical modulation is used to melt or heat disks with high heat. In particular, when recording with heat, separate modulation is performed for laser power adjustment to prevent false recording due to thermal diffusion. . The laser power modulation technique itself for preventing recording form and thermal diffusion by magnetic field modulation and light modulation is well known.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention has an advantage in that the encoder of the digital video disc recording apparatus can process information to prevent unauthorized copying of the data, so that the information can be delivered only to a legitimate person as well as the protection of confidential information.

Claims (3)

An encoder of a digital video disc recording apparatus, which is transmitted from a secret communication unit that executes all processes for copy prohibition on the data before generating error detection parity for input video data, and a main control unit of the digital video disc recording apparatus. An unauthorized copy-protection type digital video having a register for temporarily storing copy related information and a switch unit for selectively outputting copy inhibited data or copy related information from the secret communication unit or register according to the type of data. Disc burner encoder. The encoder according to claim 1, wherein the main control unit of the digital video disc recording apparatus is a microcomputer that collectively controls the overall operations required for recording the disc. An encoder of a digital video disc recording apparatus, comprising: a memory for storing input video data and buffering data before and after address or error detection or error correction parity generation, scramble, 8-16 modulation or data stream modulation; Temporarily storing duplication-related information transmitted from the main communication unit of the digital video disc recording apparatus and a secret communication unit that executes all processing for prohibiting duplication of the data before generating error detection parity for the moving image data read from the memory. A switch, a switch unit for selectively outputting copy-protected data or copy-related information from the secret communication unit or register according to the type of data, and transferring the data to the memory, and additional information so that the decoder can know whether or not there is an error. Error detection board for loading A tee generating unit, an error correcting parity generating unit for generating error correction parity to carry additional information so as to correct scattering and continuous errors, and a physical address of the disk for recording data on the disk. An address generator, a channel coder for modulating the data to which the error correction parity is added, and outputting it in a predetermined code form, and a modulator for converting the encoded data into a data stream for recording on the disc. And an unauthorized copy-protected digital video disc recorder encoder.