KR0176648B1 - Apparatus for reproducing data from several kinds of disk in a digital video disk player - Google Patents

Abstract

1. Technical field to which the invention described in the claims belongs

Optical disc playback system

2. Technical Challenges to be Solved by the Invention

And an apparatus for selectively reproducing a plurality of optical discs.

3. The point of the solution of the invention

The multi-layer optical disc reproducing system is a system for reproducing an optical disc and transmitting the optical disc to an audio / video decoder or a ROM decoder. The multi-layer optical disc reproducing system detects a synchronous pattern of a disc series by determining whether the optical disc to be reproduced is a digital video disc or a compact disc, Controlling the voltage control oscillation and the selectivity of the disc according to the determined disc series to decode the data stream read from the optical disc into the digital video disc system or the compact disc system in accordance with the detected sync pattern, Decoder or a ROM decoder.

4. Important Uses of the Invention

Selective playback of multiple optical discs

Description

Multiple optical disc selective playback system

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a multi-type optical disc selective reproducing system according to an embodiment of the present invention; FIG.

FIG. 2 is a diagram showing a specific configuration of the system decoder during the first stage. FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

100: digital video disk 120: optical head

140: Feed motor 160: Disk motor

200: system decoder 270: first memory controller

275: second memory controller 280: first memory

285: second memory 296: ID error correction section

294: Sub code detecting unit 300: Digital phase locked loop

400: Disk drive control unit 500: Microcomputer

600: Audio / video decoder 700: NTSC encoder

800: digital / analog converter 900: system clock generator

950: ROM decoder 960: monitor

970: Speaker

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc reproducing system, and more particularly, to an apparatus for selectively reproducing a plurality of optical discs.

A digital video (or versatile) disk is one of the digital moving picture disk media, and is a next-generation high-definition, high-quality, popular multimedia storage device that stores a digital image of MPEG (Moving Picture Experts Group) Since the digital video disk and the known compact disc series are both optical type, there are many similarities in the method of recording and reading signals. Nevertheless, it is now necessary to use a dedicated playback system for each disc. This is inefficient in terms of resource utilization, and results in an economic burden on the user.

Accordingly, an object of the present invention is to provide an apparatus for selectively reproducing a plurality of optical discs.

According to an aspect of the present invention, there is provided a system for reproducing an optical disc and transferring the optical disc to an audio / video decoder or a ROM decoder, the optical disc reproducing system being characterized by determining whether the optical disc to be reproduced is a digital video disc system or a compact disc system, And controls the voltage control oscillation and the speed of the disc according to the determined disc series to decode the data stream read from the optical disc into the digital video disc system in accordance with the detected synchronous pattern, Decoded and transmitted to the audio / video decoder or the ROM decoder.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the drawings, the same reference numerals are used for the same reference numerals even though they are shown in different drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. It will be obvious to those of ordinary skill in the art. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a block diagram of a multi-type optical disc selective reproducing system according to an embodiment of the present invention.

When the disc 100 is reproduced, the disc motor 160 starts to rotate at a certain speed. In the optical pickup having the head 120, the disc 100 information is converted into an analog high frequency (RF) signal and output . This signal is shaped into a pulse waveform so that the data streams ESM and EFM are transmitted to a digital phase-locked loop (PLL) 300 and a system decoder 200.

The system decoder 200 can be broadly divided into a DVD processing section and a CD processing section. The DVD processing unit processes data read from a digital video disc and a digital video ROM disc (hereinafter referred to as DVD series data). The CD processing unit is a part for processing data read from a compact disk (hereinafter referred to as CD-series data).

The microcomputer 500 is a device control unit for overall control of the overall operation of the present multi-type optical disc reproducing system so that appropriate control according to various kinds of discs can be performed by setting a predetermined register as follows. Upon receiving a data transmission start signal from the audio / video decoder 600 or the ROM decoder, a transmission control signal is generated.

The digital phase-locked loop 300 includes a phase comparator circuit, a voltage-controlled oscillator, a frequency divider, and the like, and generates a first clock synchronized with a signal reproduced from an arbitrary optical disc.

The disk drive control unit 400 controls a constant linear velocity of the disk rotation and other disk related operations in consideration of the frequency servo and the phase servo in accordance with the frame synchronization signal Sf provided by the predetermined synchronization detector 220. [ .

The audio / video decoder 600 divides the data output from the system decoder 200 into audio data and video data, and reduces the original audio data and the video data. The audio and video data demodulated by the audio / video decoder 600 are transmitted to an NTSC (or PAL) encoder 700 and a digital / analog conversion unit 800, respectively, and transmitted through a monitor 960 and a speaker 970 .

ROM decoder 950 is mainly installed in a host (e.g., a personal computer) and operates according to a command of the computer, and transfers data output from the system decoder 200 to the host according to a predetermined interface scheme.

FIG. 2 shows a specific configuration of the system decoder during the first stage.

The first memory 280 is a dynamic RAM used for error correction and buffering of DVD series data.

The second memory 285 is used for error correction of the CD-series data or as a buffer for outputting the main data among the DVD-series data to the audio / video decoder 600 or the ROM decoder 950. The second memory 285 is a RAM built in a known CD decoder.

The switch unit 292 controls the processes for the DVD series and the CD series to be distinguished according to the first disc determination signal disc 2 provided by the microcomputer 500. According to the above-described register setting example, if the first disc determination signal disc2 is '1', it is a DVD series and thus the reproduction signal is transmitted to the first demodulation unit 250. If it is '0' (255).

The first demodulator 250 demodulates an input data stream ESM in units of symbols including predetermined bits and outputs the demodulated data. In other words, the first demodulator 250 inputs the data stream ESM to the 32-bit shift register 211, and outputs the lower (or upper) 16 bits of the output 32 bits of the 32-bit shift register 211 And transfers it to the 16-8 demodulator 212. The 16-8 demodulator 212 converts the input 16-bit data into 8-bit symbols, and outputs the 8-bit data. This is because Eight to Sixteen Modulation is performed when data is recorded on the disc 100. [

The second demodulator 255 demodulates the input data stream EFM in units of symbols including predetermined bits and outputs the demodulated data stream EFM. In other words, the second demodulator 255 inputs the data stream EFM to the 23-bit shift register 215 and outputs the lower (or higher) 14 bits of the output 23 bits of the 23-bit shift register 215 And transfers it to the 14-8 demodulator 214. [ The 14-8 demodulator 214 converts the input 16-bit data into 8-bit symbols, and outputs the 8-bit data. This is because 8-to-14 modulation (Eight to Fourteen Modulation) is performed when data is recorded on the disc 100.

The sync detector 220 receives the first clock and the output of the 32-bit shift register 211 or the 23-bit shift register 215 to control the rotation of the disk 100. The sync detector 220 detects a frame sync as a standard clock, (Sf, S, Se) for detecting various synchronous patterns such as a sector synchronization for sorting and an error correction synchronous for recognizing an error correction time and for reading data in the error correction block. In addition, a window for recognizing only synchronous detection within a certain range is set, or a forced detection signal is generated when a predetermined synchronous detection is not performed.

The microcomputer interface unit 295 is responsible for interfacing the system decoder 200 with the microcomputer 500.

The first memory control unit 270 supplies a row address signal, a column address signal, and a column address signal, which are necessary for error correction or buffering, to the data reproduced from the corresponding disc in accordance with the first to third disc determination signals disc2 to disc0 provided from the microcomputer 500, , Generation of other addresses, and prevention of overflow and underflow.

The second memory controller 275 controls the second memory 285 to buffer the error correction and output data of the CD system according to the first to third disc determination signals disc2 to disc0 provided from the microcomputer 500 And controls to use the second memory 285 as a buffer for accessing or reproducing a DVD disc. That is, descrambling and error detection of the main data are performed using the second memory 285 without directly writing the error-corrected data to the first memory 280, and only the data 1 memory 280 so that the write / read access to the first memory 280 is reduced, so that more time can be spent for error correction.

The first error correction unit 230 performs error correction in a horizontal direction and a vertical direction with respect to a predetermined error correction block made up of data read from a DVD-type disk. In the present embodiment, the horizontal and vertical directions are (182,172,11) and (208,192,17), respectively. That is, the lengths of the codewords are 182 and 208, the main data excluding the parity is 172 and 192, and the codeword intervals are 11 and 17, respectively. In order to correct the error, the first memory 280 may collect the ID data and the main data output from the first demodulator 250, and store the ID data and the main data in units of predetermined blocks to form the error correction block. The error correction block is composed of data for 16 sectors. The first memory 280 also buffers data between the error correction of the two directions and stores the corrected data.

The second error correction unit 235 performs error correction on the data read from the CD-system disk by a known CIRC (Cross Interleave Reed Solomon Code) method.

Since the main data of the corrected DVD series data stored in the first memory 280 is scrambled before being written to the disk, the descrambler 240 receives the read main data and descrambles the main data, Data. At this time, the main data is 2 kilobytes (Kbytes).

The error detector 250 detects an error included in the data output from the descrambler 240. This data is buffered in the second memory 285 and transferred to the microcomputer 500 to be referred to in determining whether to repeat the error correction.

The deinterleave unit 340 may be implemented by a means for storing interleave rules, an address counter, an adder, etc. By controlling the write / read addresses of the first memory 280, data interleaved on a frame- And stores it. In the present embodiment, the deinterleave unit 340 is separately shown. However, in actual implementation, the deinterleave unit 340 is included in the memory control unit 270 to perform deinterleaving in addition to error correction and descrambling.

The ID error correction unit 296 directly inputs the ID data output from the 16-8 demodulation unit 212 and corrects the ID error. The corrected ID data is transmitted to the microcomputer 500 together with the ID error flag to allow the microcomputer 500 to refer to controlling the search operation of the DVD-type disc 100. Also, the corrected ID data is stored in the corresponding area of the first memory 280. In addition, the stored ID data is read again, and error correction is performed again with the main data together with the main data together with the main data. In this case, if the ID data has an error even before this, the stored contents of the first memory 280 are corrected Video decoder 600 or the microcomputer interface unit 295 together with the main data after the descrambling process. For this purpose, the ID error correcting unit 296 divides one period of the sector synchronous signal provided by the synchronization detecting unit 220 appropriately so that the source performs another ID error correction. In this embodiment, the ID error correction type is (6, 4, 3).

The subcode detecting unit 294 extracts the subcode data P to W from the demodulated data of the CD series output from the 14-8 demodulator 294. [

The first selector 291 outputs the corrected ID data and the ID error flag output from the ID error corrector 230 or the sub code Q bits and the error flag output from the sub code detector 294 to the microcomputer interface unit 295 to the microcomputer 500. The selection at this time depends on the state of the first disc determination signal disc2 described above. As the first disc determination signal disc2, it is possible to distinguish whether the data is a CD series or a DVD series.

The interface unit 290 is responsible for interfacing the system decoder 200 and the audio / video decoder 600. For example, the first memory controller 275 controlled by the microcomputer 500 reads the DVD-format descrambled data stored in the first memory 280 based on the system clock, and outputs the descrambled data to the audio / video decoder 600 through the interface unit 290. In other words, the interface unit 290 performs operations related to timing control, noise removal, signal sequence change, and decoding of the address when the system decoder 200 and the audio / video decoder 600 are interfaced do.

The interface unit 290 includes a known CD-ROM decoder 293 and a switch unit 292. This is for the purpose of passing through the CD-ROM decoder 293 in the case of data read from a video compact disc (V-CD). The reason for doing this is because the audio / video decoder 600 typically does not have a CD-ROM decoder, if not, the portion may be omitted. The switch unit 292 is connected to the CD-ROM decoder 293 when the first to third disc determination signals disc2 to disc0 are (0, 0, 1).

The interface unit 290 includes a second selection unit 206 and outputs the processed data to the CD-ROM decoder 293 in accordance with the first to third disc determination signals disc2 to disc0 provided from the microcomputer 500 (V-CD) data output from the second memory 280 or DVD-series data or CD-series data output from the second memory 280 excluding the video compact disc (V-CD) (CD-G data) on the basis of the first to third disc determination signals (disc 2 to disc 1) ROM decoder 950, and transfers the remaining data of the CD or DVD series to the audio / video decoder 600.

The present invention as described above enables one playback system to selectively play back a CD-series and a DVD-series disk, thereby being efficient in terms of resource utilization, economically reducing the burden on the user, In terms of multifunctionality, it also has the advantage of high added value.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (9)

In a multi-type optical disc playback system having a disc drive control unit for driving an optical disc and an audio / video decoder or a ROM decoder, a type of an optical disc to be played back is determined to generate a disc judgment signal, A main controller for generating operation control signals necessary for processing data reproduced from the audio / video decoder or the ROM decoder and generating a data transmission signal upon receipt of a data transmission start signal from the audio / video decoder or the ROM decoder, A second data processing unit for demodulating and error correcting and descrambling the data, a second data processing unit for demodulating and error-correcting data of the compact disc series in accordance with the synchronization detection signal, 2 data processor, A sync detecting section for generating a sync detection signal for detecting various sync patterns of the disk in accordance with the disk determination signal; A first memory for data buffering for compensating an input / output rate chart; an error correction and data buffering unit for error buffering and data buffering in the second data processing unit, a data processing unit for output buffering of data processed in the first data processing unit, A first memory controller for controlling access to the first memory to read data stored in the first memory in operation of the first data processor, 2 data processing unit, or in response to the transmission control signal, data stored in the second memory And an interface for transmitting data read from the second memory to the audio / video decoder or the ROM decoder in accordance with the disc determination signal, for controlling the access to the second memory for reading The system features. The apparatus according to claim 1, wherein the first processing unit comprises: a demodulation unit for demodulating and outputting a data stream read out from the optical disc in units of a symbol made up of predetermined bits and outputting ID data from data output from the demodulation unit; An ID error correction unit for performing error correction on the detected ID data and transmitting the error correction information as sector position determination information for controlling the disk to the master unit control unit and storing the ID information in the memory; A descrambler for receiving only the main data portion of the error-corrected data and restoring the original data by compensating for a time delay due to scrambling; and an error detector for detecting errors included in the data output from the descrambler As the information for determining whether or not the error correction is repeated, The system characterized by consisting of a multiple detector. 2. The apparatus according to claim 1, wherein the second processing unit comprises: a demodulation unit for demodulating and outputting a data stream read from the optical disc in units of symbols made up of a predetermined number of bits; and a demodulation unit for detecting subcode data from data output from the demodulation unit, And a subcode detecting unit for performing error correction on the detected subcode data and transferring the corrected data to the main controller as sector position determination information for controlling the disk, and storing the subcode information in the memory. 2. The system of claim 1, wherein the interface further comprises a compact disc ROM decoder for performing error correction and descrambling on video-compact disc data. The system of claim 1, wherein the digital video disk series data is digital video disk data or digital video disk ROM data. The system of claim 1, wherein the compact disc series data is a compact disc disc data, a video compact disc data, a compact disc ROM data, or a compact disc graphic data. 2. The system of claim 1, wherein the error correction unit performs error correction in a horizontal direction and a vertical direction of the block, and the memory buffers data between the two directional error correction. The system decoder according to claim 1, wherein the disc drive control unit performs a constant speed control of a digital video disc system or a constant speed control of a compact disc system in accordance with the disc determination signal. 9. The system of any one of claims 1 to 8, wherein the first memory is a dynamic RAM and the second memory is a static RAM.