KR100544828B1 - Digital data player - Google Patents

Abstract

The present invention relates to an apparatus for reproducing digital data from various types of recording media recorded with different data formats.

The digital data reproducing apparatus of the present invention comprises input means for providing a channel bit stream and a channel clock from various types of recording media recorded in different recording formats, and for determining and setting a specific recording format from an external control signal or channel bit stream. Means, means for storing a plurality of sync patterns corresponding to different recording formats and selecting the corresponding sync patterns according to the set recording format to detect a sync signal from the channel bitstream, and a plurality of sectors corresponding to different recording formats. Means for storing size information, selecting corresponding sector size information according to a set recording format, and extracting sector data from a channel bitstream in accordance with a detection of a synchronization signal; and performing digital signal processing according to sector data and channel clocks to perform the sector data. And means for decoding the.

According to the present invention, a channel bitstream reproduced from discs of different recording formats can be reproduced by extracting and decoding sector data corresponding to the corresponding recording format using a simple interface board and an application program.

Description

Apparatus For Reproducing Digital Data             

1 is a block diagram showing the configuration of a digital data reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a detailed configuration of an interface unit illustrated in FIG. 1;

3 is a timing diagram illustrating input and output signal waveforms of respective components shown in FIG. 2;

FIG. 4 is a diagram showing the configuration of the memory shown in FIG. 1; FIG.

5 is a flowchart illustrating step by step an execution process of the application program shown in FIG.

<Brief description of symbols for the main parts of the drawings>

2: drive 10: interface board

12: interface unit 14: memory

16: PCI controller 18: PCI bus

20: PC 22: PC memory

24: application program 30: synchronous format determination unit

32: sync detector 36: sector counter
38: Disc Information Decoder 40: Memory Controller
42: PCI interface unit 44: serial-parallel conversion unit

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The present invention relates to an apparatus for reproducing digital data from various types of recording media recorded with different data formats.

Recently, optical recording media, magneto-optical recording media, and the like have been developed and commercialized as recording media for storing various information such as audio and video information. Of these, optical recording media include CD-ROM (CD-Read Only Memory) and DVD-ROM (Digital Versatile Disc-ROM), including CDs (Compact Disc), which have already been generalized, and CD-R ( WORM (Write Once Read Many) type of recording media such as CD-Recordable and DVD-R, and rewritable such as CD-Rewritable (CD-RW) and DVD-Random Access Memory (DVD-RAM), DVD-RW, etc. Possible recording media are being distributed or developed.

As such, as various types of recording media have emerged, it is required to reproduce the recording media with a single playback device. However, the optical recording media not only have different recording formats, for example, sector sizes and operation clocks, but also data are recorded in different recording formats between the same category of recording media such as CD-ROM and DVD-ROM. For this reason, in order to reproduce various types of recording media by one playback apparatus, a digital signal processing unit corresponding to each recording media is required.

However, when the digital signal processing unit corresponding to each recording medium is provided, the circuit size is not only large but also complicated.

Accordingly, it is an object of the present invention to provide a digital data reproducing apparatus capable of reproducing digital data from various types of recording media recorded in different recording formats with a simple configuration.

In order to achieve the above object, the digital data reproducing apparatus according to the present invention comprises an input means for providing a channel bit stream and a channel clock from various types of recording media recorded in different recording formats, and from an external control signal or channel bit stream. Means for determining and setting to a specific recording format, means for storing a plurality of synchronization patterns corresponding to different recording formats, and selecting a corresponding synchronization pattern according to the set recording format to detect a synchronization signal from the channel bitstream; Means for storing a plurality of sector size information corresponding to the recording format, selecting the corresponding sector size information according to the set recording format, and extracting sector data from the channel bitstream in accordance with the synchronization signal detection; and digitally according to the sector data and the channel clock. Number of decoding the sector data by performing signal processing It characterized in that it comprises a.

Other objects and advantages of the present invention in addition to the above object will be apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5.

1 is a block diagram showing a configuration of a digital data reproducing apparatus according to an embodiment of the present invention, wherein the digital data reproducing apparatus shown in FIG. 1 is a programmable communication interface (PCI) bus 18. It includes a PCI board type Interface Board (Interface Board) 10, and a PC (Personal Computer) 20 including an application program (Application Program) for operating the same.

In the digital data reproducing apparatus shown in FIG. 1, a drive 2 such as ROM, RAM, R, RW, etc. detects a high frequency signal from an optical disc having a different recording format, and processes the high frequency signal to process a channel bit stream and a channel clock. Will be provided. In this case, one drive having one pickup or having a plurality of pickups corresponding to each disk can play the various disks. The interface board 10 inputs a channel bitstream and a channel clock provided by being reproduced from various types of discs having different recording formats, and extracts sector data corresponding to the corresponding recording format set by an external control signal to the memory 14. An interface unit 12 for storing, and a PCI control unit 16 connected between the interface unit 12 and the memory 14 and the PCI bus 18. Here, the interface unit 12 includes a disc information decoder 38 for decoding disc information transmitted from the PC 20 and a synchronization pattern according to the disc information from the disc information decoder 38, as shown in FIG. And 16 counters and sectors for selecting the sector size according to the disc information from the disc format decoder 38 and the sync detector 32 for detecting the sync signal from the channel bitstream. A serial-to-parallel converter 44 for dividing the counter bit, the channel bitstream input to the sector counter 36 in units of sectors selected by the sector counter 36, and outputting them to the memory 14, a disc information decoder 38, and A memory controller 40 for controlling the memory 14, a PCI controller 16, a memory controller 40, and a disk information decoder 38 connected to the output terminals of the synchronous detector 32 and the sector counter 36; Connected PCI The interface part 42 is provided. The interface board 10 having such a configuration is normally mounted in a PCI slot provided on the PC 20 and operated by the application program 24 on the PC 20.

The PC 20 transmits the selected disk information to the interface board 10 via the PCI bus 18 when the type of the disk to be played currently is selected by the user. In the interface board 10, the PCI controller 16 generates a port address for transmitting the disk information input from the PC 20, and transmits the disk information, that is, the port data, to the interface unit 12. In the interface unit 10, the disc information decoder 38 decodes the disc information transmitted from the PCI control unit 16 via the PCI interface unit 42 and converts the disc information into the synchronous format determination unit 30 and the sector counter ( 36). Herein, the information on the disc means the type of the disc. The sync format determiner 30 stores different sync patterns according to the type of the disc, and selects a sync pattern suitable for the format of the disc to be reproduced by the disc information input from the disc information decoder 38. The sync detector 32 Will be sent to. The sync detector 32 continuously compares the synchronous data selected by the sync format determiner 30 with the channel bitstream input from the drive to detect the sync signal SYNC0 as shown in FIG. The sector counter 36 selects a sector size corresponding to the type of the disc input from the disc information decoder 38 and performs a counting operation by that size. The sector counter 36 has different sector sizes according to the types of disks, so that different sector sizes are mapped to the types of disks. In addition, when the synchronization signal SYNC0 is input from the synchronization detector 32, the sector counter 36 generates a high level counter mask signal as shown in FIG. 3 and transmits it to the 16 counters and the serial-to-parallel converter 44. do. When the counter mask signal generated from the sector counter 36 is at the high level, the 16 counter counts the channel clock input from the corresponding drive and generates the indi_16 signal every 16th clock as shown in FIG. And output to the memory controller 40 and the serial-to-parallel converter 44. The sector counter 36 counts the indi_16 signal output from the 16 counter by a predetermined sector size and matches the magnitude thereof to generate the end_sector signal as shown in FIG. 3 and output the signal to the memory controller 40. The memory controller 40 receives the indi_16 signal generated from the 16 counter and the end_sector signal generated from the sector counter 36, counts the indi_16 signal to generate the write channel address of the memory 14, and uses the end_sector signal of FIG. 4. A memory bank selection signal is generated as shown in FIG. The serial-parallel converter 44 receives the channel clock and the channel bitstream from the corresponding drive, receives the counter mask signal generated from the sector counter 36 and the indi_16 signal generated from the 16 counter, and the counter mask signal has a high level. Only when the channel bit stream is shifted in the 16-bit shift register in accordance with the channel clock, each time the indi_16 signal is generated, the 16-bit is latched to generate the write channel data to be stored in the memory 14. The memory 14 may be sized to include about two banks capable of applying dual port RAM and storing one sector data as shown in FIG. 4. The memory 14 selects a memory bank by using the memory bank selection signal generated by the memory controller 40 as the MSB address signal of the memory 14. In addition, the memory 14 writes the write channel data input from the serial-parallel conversion unit 44 to the corresponding bank by the write channel address generated by the memory controller 40. When the PCI interface unit 42 detects that one bank of the memory 14 is full by using the memory bank selection signal generated by the memory controller 40, the PCI interface unit 42 may bring the data stored in the memory to the PCI controller 16. A good memory read interrupt signal is generated. The PCI controller 16 transmits the memory read interrupt signal input from the PCI interface 42 to the PC 20 through the PCI bus 18. The PC 20 recognizes the memory read interrupt signal input through the PCI bus 18 on the application program to generate a left channel address corresponding to the corresponding bank of the memory 14 and the size of one sector from the memory 14. The data is taken in accordance with the PCI clock generated by the PCI controller 16. After the PC 20 takes all data of one sector size, the PC 20 generates an ACK signal and transmits the ACK signal to the PCI interface 42 through the PCI bus 18 and the PCI controller 16 to transmit the next sector data. You will be informed that you are ready to take it. In addition, the PC 20 calls and decodes the data read by the above process according to the type of the selected disk.

FIG. 5 is a flowchart illustrating step by step an application program execution process on the PC 20 shown in FIG. 1.

Firstly, in step 2, the user selects the type of disc to be currently played. In step 4, the information on the disk type selected in step 2 is transmitted to the interface board 10 through the PCI bus 18. Next, in step 6, the interface unit 12 in the interface board 10 decodes the disk information transmitted from the PC 20, sets the recording format according to the disc type, and inputs from the corresponding drive in response to the set recording format. If the channel bitstream is stored in the memory 14 sector by sector and a memory read interrupt signal is generated from the PCI interface 42, the process proceeds to step 8. In step 8, the PC 20 recognizes the memory read interrupt signal input through the PCI bus 18 on the application program to generate a left channel address corresponding to the corresponding bank of the memory 14, and in step 10 the memory 14 1 sector size data is taken in accordance with the PCI clock generated by the PCI control unit 16. Subsequently, in steps 12 to 24, the PC 20 calls and decodes the read data corresponding to the type of the selected disk, that is, RAM, ROM, R, RW, frame wobble, and the like.

By repeatedly performing such a process, even if the data recorded in any format is desired, only the channel bitstream and the channel clock generated by the drive can perform the desired decoding.

As described above, the data reproducing apparatus according to the present invention extracts and decodes channel bitstreams reproduced from discs of different recording formats by extracting and decoding sector data corresponding to the corresponding recording format using a simple interface board and an application program. The digital signal processing unit corresponding to the format can be reproduced without the need.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (1)

Input means for providing a channel bitstream and a channel clock from various types of recording media recorded in different recording formats; Means for determining and setting from an external control signal or the channel bitstream to a specific recording format; Means for storing a plurality of sync patterns corresponding to different recording formats and selecting a corresponding sync pattern according to a set recording format to detect a sync signal from the channel bitstream; Means for storing a plurality of sector size information corresponding to different recording formats, selecting corresponding sector size information according to a set recording format, and extracting sector data from the channel bitstream according to the synchronization signal detection; And means for decoding said sector data by performing digital signal processing in accordance with said sector data and said channel clock.

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