KR100220601B1 - Data processing method for use in a digital video disc recorder - Google Patents

Abstract

The present invention relates to a data processing method of a digital video disc player, comprising: (a) reading a data search information (DSI) data in an NV_PCK area of a data area recorded on the disc when the playback mode is an interleaved playback mode; B) Read the SML＿PBI (seamless playback information) data contained in the DSI data, set the ILVU-EA (end address of interleaved unit) to the sector end address (ES＿A), and NXT＿ILVU＿SA (start address of the next interleaved unit) Setting the sector start address (SS_A) and setting NXT_ILVU_SZ (size of the next interleaved unit) to the size of the next sector (SZ_A), and (c) the address of the sector to be reproduced and input is 1 Blocking the input of the reproduced data into the memory if it is equal to the large address (ES # A + 1), and (d) adding the sector to be reproduced and input. If the address is the same as the next sector start address (SS_A), allowing the input of the reproduced data into the memory; and (e) the address of the sector to be reproduced and inputted is the next sector start address (SS_A) and the next sector. And blocking the input of the reproduced data into the memory if it is larger than the sum of the sizes SZ_A.

Description

Data processing method of digital video disc player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video disc player, and more particularly, to a data processing method of a digital video disc player such that only intermittent data is temporarily stored in a buffer memory during interleave playback.

With the development of audio and video media, optical disc players for recording and reproducing video and audio data on semi-permanent optical discs have been developed.

Such an optical disc player reproduces an image and / or audio recorded on an optical disc and outputs it through a screen and / or a speaker, and has a higher signal-to-noise ratio than conventional image and / or audio reproducing apparatus, resulting in better image quality and / or Or it can reproduce the signal with sound quality, it does not generate noise due to irregular reproduction and modulation, very low distortion, no ghost and random access, so it is rapidly developed and widely distributed. There is a trend.

In addition, such an optical disk player includes a compact disk player (CDP), a laser disk player (LDP), a compact disk graphic player (CDGP), and a video compact disk player (VCDP: video compact disk player) has been developed and widely used, and recently, digital video disk (DVD or digital versatile disc) using MPEG-2 moving picture compression technology and digital video disk player for playing it have been developed. It is capable of recording and playing back gigabytes (GB) of data including moving pictures in an optical disc of 12 cm, such as a current CD, and is designed to be compatible to play current CDs and VCDs.

On the other hand, a digital video disc player as described above is connected to a digital signal processor for demodulating a signal reproduced from a disc, detecting and restoring an error signal, and descrambling it to process a digital signal, and such a digital signal processor. A buffer memory for temporarily storing digital signal processed reproduction signals and sequentially outputting them, and an MPEG-2 decoder for decompressing and decoding the output signals of the digital signal processor based on the MPEG compression format are provided.

That is, the digital signal processor is connected to a buffer memory for temporarily storing the processed data in order to control the data processing speed in response to the variable data transfer speed of the MPEG-2 decoder, that is, the data output speed. As a result, the digital signal processing unit must control the data processing speed appropriately according to the data transmission speed of the MPEG-2 decoder.

However, when the data transfer speed of the MPEG-2 decoder becomes slow, the data stored in the buffer memory of the digital signal processing unit becomes full and the playback of the disc must be paused. In addition, when the data transfer rate of the MPEG-2 decoder becomes high, the buffer memory of the digital signal processing unit becomes a data empty state, and the reproduction state may be poor.

Therefore, in order to prevent such playback stop and playback failure, a buffer memory of a digital signal processing unit generally used in a digital video disc player uses a large memory, that is, a memory having a capacity of about 4M bits.

However, if there are too many errors in the RF (radio frequency) signal reproduced on the disk due to the deterioration of the disk, error correction is impossible. At this time, data is read from the disk again in the region where the error correction is impossible, and thus the buffer is used. The probability of a data empty state in memory is increased.

On the other hand, in general, data streams are recorded interleaved on a DVD in accordance with a parental level, a photographing angle, and the like. Therefore, only the selected data stream may be read and the remaining data may be discarded according to the set playback state.

Accordingly, the present invention has been conceived in view of the above, and an object of the present invention is to read only a selected data stream and store it in a buffer memory and discard other data in the case of interleaved playback when a playback function is executed in a digital video disc player. An object of the present invention is to provide a data processing method of a digital video disc player that can efficiently utilize a buffer memory.

According to a preferred embodiment of the present invention for achieving the above object, the digital signal processing unit for digital signal processing the data reproduced from the disk and the data processed by the digital signal processing unit temporarily stored and sequentially output according to the data transmission rate In performing a playback on a digital video disk player including a memory, the data processing method of the digital video disk player for appropriately processing the data to be played back when interleaved playback according to the viewing grade or the shooting angle is performed. Reading the data search information (DSI) data in the NV_PCK area of the data area recorded on the disc; and (b) reading the SML_PBI (seamless playback information) data contained in the DSI data when the playback mode is an interleaved playback mode. ILVU-EA reads end address Set the interleaved unit (SE＿A) to the sector end address (ES＿A), set the NXT＿ILVU＿SA (start address of the next interleaved unit) to the next sector start address (SS＿A), and set NXT＿ILVU＿SZ (size of the next interleaved unit) for the next sector. Setting the size SZ_A and (c) blocking input of the reproduced data into the memory if the address of the sector to be reproduced and input is equal to the address ES_A + 1 greater than the sector end address; (D) allowing the input of the reproduced data to the memory if the address of the sector to be reproduced and input is equal to the next sector start address (SS # A); Blocking the input of the reproduced data into the memory if it is larger than the sum of the sector start address SS_A and the size of the next sector SZ_A.

1 is a schematic block diagram of a general digital video disc player for practicing the present invention;

2 to 4 are diagrams for explaining the format of data recorded on a digital video disc;

5 is a detailed flowchart illustrating a data processing method of a digital video disc player according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

5: key input unit 10: microcomputer

15: Optical pickup unit 20: RF amplifier and focus / tracking error detection unit

25: servo signal processing unit 30: motor and motor drive unit

35: digital signal processor 37, 42: memory

40: MPEG-2 decoder 45: Header decoder

50: AC-3 decoder 55: audio signal processor

60: video signal processor 65: speaker

70: Screen D: Disk

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

1 is a schematic block diagram of a digital video disc player for carrying out the present invention, and FIGS. 2 to 4 are diagrams for explaining the format of data recorded in a DVD video area recorded on a digital video disc.

As shown in Fig. 1, a digital video disc player for implementing the present invention includes a key input unit 5, a microcomputer 10, a memory 12, an optical pickup unit 15, an RF (radio frequency) amplifier and a focus. / Tracking error detector 20, servo signal processor 25, motor and motor driver 30, digital signal processor 35, MPEG-2 decoder 40, header decoder 45, AC-3 A decoder 50, an audio signal processor 55, a video signal processor 60, a speaker 65, and a screen 70 are included.

The operation of the DVD player constructed as described above is as follows.

The optical pickup unit 15 performs optical pickup from the disk D loaded in the disk tray (not shown), and outputs an RF signal read out accordingly.

In addition, the motor and the motor driving unit 30 drive the spindle motor (not shown) to rotate the disk D, and drive the pickup transport motor (not shown) so that the optical pickup unit 15 performs optical pickup. To read the data recorded on the disk D and output it as an RF signal.

The RF amplifier and tracking / focus error detection unit 20 amplifies the RF signal provided from the optical pickup unit 15 and provides it to the digital signal processing unit 35. The RF signal and the tracking / focus error detection unit 20 also detect the focus and tracking error signals from the signal, and then the servo signal. It is provided to the processing part 25.

The servo signal processor 25 provides a servo signal according to the focus and tracking error signals provided from the RF amplifier and the tracking / focus error detector 20 to the motor and the motor driver 30, respectively, through the optical pickup unit 15. The light causes tracking and focus servo to occur on the disc D.

The digital signal processing unit 35 performs digital signal processing on the amplified RF signal provided from the RF amplifier and the tracking / focus error detection unit 20 and performs error detection and error correction. 2 is output to the decoder 40.

Meanwhile, the header decoder 45 separates header information excluding MPEG video and audio data from the digital signal provided by the digital signal processor and provides the header information to the MPEG-2 decoder 40.

The MPEG decoder 40 converts digital data in the form of a bit stream from which the error correction is provided from the digital signal processor 35 through the header decoder 45 and the header information is separated into a video signal and an audio signal. After separation, the audio signal is output to the AC-3 decoder 50, and the video signal is decoded based on the MPEG-2 compression format and then output to the video signal processor 60.

On the other hand, the AC-3 decoder 50 decodes the audio signal encoded by the Dolby AC-3 method provided from the MPEG-2 decoder 40 and provides it to the audio signal processor 55, the audio signal processor ( 55 converts the decoded audio signal provided from the AC-3 decoder 50 into an audio signal processing and an analog signal and outputs the speaker 65.

The video signal processing unit 60 outputs the decompressed and decoded video signal provided from the MPEG-2 decoder 40 to the screen 70 after being processed.

The key input unit 5 provides a function key signal for executing a predetermined function in the DVD player, and the microcomputer 10 transmits a control signal according to the key signal provided from the key input unit 5 to the respective components. It occurs so that the predetermined function can be executed.

In addition, the digital signal processor 37 and the MPEG decoder 42 respectively store buffer data 37, that is, RAM 37, which temporarily stores the processed data in order to transfer the processed data at a predetermined appropriate speed. Is connected, and temporarily stores the data processed by the digital signal processing unit 35 and the MPEG-2 decoder 40, and outputs the data according to the data transfer rate.

2 to 4, the format of the data recorded in the DVD video area of the digital video disc is as follows.

First, a data area recorded on a disc is divided into a volume and file structure area and a DVD video area. The DVD video area includes a VMG (video maneager) area and a n as shown in FIG. Video title set (VTS) areas, and each VTS area includes a video title set information (VTSI) area, a VTSM_VOBS, a VTSTT_VOBS, and a backup VTSI area.

The VTSM_VOBS and VTSTT_VOBS regions are composed of i VOBS_ID regions, and each VOBS_ID region is composed of a plurality of cell C_ID regions.

Each cell C_ID region has an NV_PCK and an audio and video region, and among these, the NV_PCK region includes DSI (datd search information) data.

As shown in FIG. 3, the DSI data includes SML 데이타 PBI (seamless playback information) data, and as shown in FIG. 4, the SML＿PBI data includes an end address of interleaved unit (ILVU-EA), NXT＿ILVU＿SA (start). It contains data of address of the next interleaved unit (NXT) and size of the next interleaved unit (NZT), which are referred to for interleaved reproduction.

That is, according to the present invention, if the playback mode of the digital video disc player operating as described above is the interleaved playback mode according to the shooting angle or the viewing grade, the microcomputer 10 provides the header decoder 45 as described above. According to the ILVU-EA (end address of interleaved unit), NXT＿ILVU＿SA (start address of the next interleaved unit), NXT＿ILVU＿SZ (size of the next interleaved unit) data, the sector end address (ES＿A) according to interleaved playback, the next sector start address ( SS_A) and the size of the next sector (SZ_A) are set, and a control signal is generated to the digital signal processing unit 35 with reference to the set data so that the reproduction signal provided from the RF amplifier 20 is a signal selected according to interleaved reproduction. The signal processed by the digital signal processor 35 is temporarily stored in the memory, that is, the RAM 37, and the signal selected according to the interleaved reproduction is Otherwise, it is not stored in the RAM 37. In addition, the microcomputer 10 generates a control signal to the motor and the motor driver 30 when the data is not selected according to the interleaved reproduction through the information of the reproduction data provided from the header decoder 45, thereby operating the optical pickup unit 30. The playback may be performed by jumping to the next sector start address selected in accordance with the interleaved playback so that only the playback data selected in accordance with the interleaved playback is stored in the RAM 37.

5 is a detailed flowchart illustrating a data processing method of a digital video disc player according to an exemplary embodiment of the present invention.

First, in step S10, it is determined whether the current playback mode is the interleaved playback mode according to the viewing grade or the photographing angle. In this case, if it is the interleaved playback mode, the flow advances to step S20, otherwise the flow is fed back.

On the other hand, when the process proceeds from the step S10 to the step S20, in the step S20, the data recorded in the data search information (DSI) area in the NV_PCK area of the data area recorded on the disk is read and the process proceeds to the step S30. .

Then, in step S30, the SML_PBI (seamless playback information) data included in the DSI area data is read out, and the process proceeds to step S40. In step S40, the end address of interleaved unit (ILVU-EA) is set to the sector end address (ES # A), and then in step S50, the NXT_ILVU \ SA (start address of the next interleaved unit) is set to the next sector start address (SS_A). ), And in step S60, NXT_ILVU_SZ (size of the next interleaved unit) is set to the size of the next sector (SZ_A).

Further, in step S70, the address of the sector to be reproduced and inputted is compared with the address ES_A + 1 one larger than the sector end address. If they are the same, the process proceeds to step S80 and the digital signal-processed reproduction audio and video is performed. Data is blocked from being input into the memory 37, otherwise the flow advances to step S90.

When the process proceeds from the step S70 to the step S90, in step S900, the address of the sector to be reproduced and input is compared with the next sector start address SS_A. In this case, if it is the same, the process proceeds to the step S100 and the digital signal processing is performed. After the reproduced audio and video data is input into the memory 37 and stored, the flow returns to step S20 to repeat the flow, otherwise proceeds to step S110.

Then, in step S110, the address of the sector to be reproduced and input is compared with the sum of the next sector start address SS_A and the size of the next sector SZ_A, wherein the address of the sector to be reproduced and input is the next sector start address. If it is larger than the sum of SS_A and the size of the next sector (SZ_A), the flow advances to step S120 to block the reproduced audio and video data from being input into the memory 37, otherwise step S110 returns. )do.

In addition, when steps S80, S100, and S120 are completed, the flow also returns to continue the flow so that only the data selected by the interleaved reproduction can be stored in the memory 37.

As described above, the present invention allows only the video and audio data selected according to the interleaved playback in a digital video disc player to be temporarily stored in the buffer memory so that the buffer memory can be empty or more efficiently. There is an effect that can prevent the pool state.

Claims (1)

Playback is performed in a digital video disc player including a digital signal processor for digital signal processing of data reproduced from a disc and a buffer memory for temporarily storing data processed by the digital signal processor and sequentially outputting the data according to a data transfer rate. In the case of interleave playback according to the viewing grade or the shooting angle, the data processing method of the digital video disc player for appropriately processing the data to be played back, (A) if the reproducing mode is an interleaved reproducing mode, reading data search information (DSI) data in the NV_PCK area of the data area recorded on the disc; (B) read the SML_PBI (seamless playback information) data included in the DSI data, set the ILVU-EA (end address of interleaved unit) to the sector end address (ES_A), and NXT_ILVU_SA (start address of the next interleaved unit). Setting the next sector start address (SS_A) and setting the size of the next interleaved unit (NXT_ILVU_SZ) to the size of the next sector (SZ_A); (C) blocking the input of the reproduced data into the memory if the address of the sector to be reproduced and input is equal to the address ES_A + 1 greater than the sector end address; (D) allowing input of the reproduced data into the memory if the address of the sector to be reproduced and input is equal to the next sector start address (SS_A); (E) blocking the input of the reproduced data into the memory if the address of the sector to be reproduced and input is greater than the sum of the next sector start address SS_A and the size of the next sector SZ_A. How data is processed.

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