KR100300981B1 - Apparatus and method for writing and reading disk - Google Patents

Abstract

The present invention provides a device and a method for automatically inserting a program in real time on a disc and recording a random access position of the inserted program to play a program desired by a user during playback, and recording audio and video data on the disc. Reading the recording time corresponding to the recorded time and sector address information corresponding to the recorded area to confirm the recorded program, the recording date information of the last recorded program in the process coincides with the date of the current program, If the sum of the playing time of the last recorded program and the recording time of the current program exceeds a certain time, it includes the process of adding and recording the program. Search is possible.

Description

Disc recorder and method

The present invention relates to an apparatus and method for recording and reproducing audio and video data using a recordable, rewritable disc, and more particularly, to automatically inserting a program on a disc in real time and recording a random access position for the inserted program Providing a device and a method for playing a program desired by the user during playback.

In general, home appliances that use audio and video data using discs include video-CD and DVD players. All of these devices are dedicated to playback, and can only read the information generated by the disc maker. Discs used in these devices generally have a program structure composed of multiple steps using several programs, and various random access positions are recorded for the user's convenience. This is a separate tool that generates audio and video data in a separate device, and is a separate professional tool that operates on a computer. The program maker composes an arbitrary program using audio and video data, and accordingly, random access location information of each program. Various non-real time analysis of the back and write to the disk. However, such a complicated data structure has a problem that it is difficult to compose a multi-level complex program or to record various random access location information when recording audio and video data in real time.

The technical problem to be achieved by the present invention is to provide an apparatus for automatically inserting a program in real time using a disk and recording the random access position information for the inserted program.

Another object of the present invention is to provide a method for automatically inserting a program in real time using a disk and recording random access position information on the inserted program.

1 is a block diagram of an optical recording and reproducing apparatus for carrying out the present invention.

2 illustrates a relationship between a general PGCI and a VOB.

FIG. 3 is a detailed view of the PGCI of FIG. 2.

4 is a flowchart for automatically inserting a program in real time in an apparatus for recording and reproducing audio and video data according to the present invention.

5 shows a data structure in units of sectors recorded on a disc.

6 shows a timing diagram between a picture start code and a sector address.

7 is a flowchart illustrating a method of detecting a sector address in the DSP 104 of FIG. 1.

In order to solve the above technical problem, an apparatus for recording audio and video data on a rewritable disc,

A codec unit for encoding audio and video data and generating time information corresponding to the data;

A digital signal processor for classifying audio and video data generated by the codec unit in units of sectors and detecting sector address information at a position corresponding to specific data while searching contents of input audio and video data;

And a system controller configured to set the video and audio data in units of programs according to time information and sector address information generated by the codec unit and the digital signal processor unit, and record information added thereto in real time. It is a disk recording device.

In order to solve the above technical problem, a method of adding a predetermined amount of programs in real time while recording audio and video data on a rewritable disc, comprising: (a) recording audio and video data on the disc; process; (b) reading a recording time corresponding to the time recorded in step (a) and sector address information corresponding to the recorded area to confirm the recorded program; (c) If the recording date information of the program last recorded in step (b) is different from the current date, or if the sum of the playback time of the last recorded program and the recording time of the currently recorded data exceeds a certain time, A disc recording method comprising the step of additionally recording.

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

Fig. 1 is a block diagram of an optical recording / reproducing apparatus for carrying out the present invention, which is a typical example of a DVD-recorder for audio / video (hereinafter referred to as A / V) capable of recording and re-recording. The function of the optical recording and reproducing apparatus can be largely divided into two parts: recording and reproducing the audio / video data and the attributes of the audio / video data and the information data for random access.

In Fig. 1, in the recording mode, an audio and video encoder and decoder (hereinafter referred to as a codec: 102) uses an externally input A / V data by a predetermined compression encoding scheme (e.g., MPEG standard). Compression-encoded and provide time information on the compressed data, DSP (Digital Signal Process) 104 adds additional data for ECC (Error Correction Code) processing to the coded data applied from the AV codec 102 The error correction coded data is modulated by a predetermined modulation scheme to generate modulated data, and the input data is retrieved to generate a sector address at a required position.

A high frequency (RF) amplifier 106 amplifies the electrical data applied from the DSP 104 into an optical signal. The pickup unit 108 drives the disk 109, records the optical signal applied from the RF amplifier 106 to the rewritable disk 109, and incorporates an actuator for focusing and tracking.

The servo unit 110 receives the information necessary for servo control from the DSP 104 through the RF amplifier 106 and the system controller 112 and performs a stable servo function for controlling the pickup unit 108.

The system controller 112 records the A / V data on the disk while controlling the entire system, and automatically sets program units to record the information added thereto.

On the other hand, in the playback mode, the pickup unit 108 reads out the stored data from the disc 109 and outputs the optical signal. The RF amplifier 106 converts this optical signal into an electrical signal, extracts modulated data, and generates a servo signal for performing stable servo using this electrical signal.

The DSP 104 demodulates the modulated data and performs ECC on the demodulated data to correct the error to remove the additional data, and the servo unit 110 uses the servo signal applied through the RF amplifier 106. Various servos are driven to stabilize. The AV codec 102 decodes the compressed coded audio and video data transmitted from the DSP 104 and finally outputs the decoded audio and video signal. The system controller 112 processes a user's input through an interface with the user, and controls the entire system for program reproduction using information on the disk.

2 illustrates a relationship between a general PGCI and a VOB.

In PGCI (Program Chain Information), connection information about the structure of programs is recorded. In VOB (Video Object), compressed audio and video data are recorded. One or more programs exist in one PGCI, and one program consists of a set of one or more cells. Each cell is a kind of recording and reproducing unit, and the actual data exists in the VOB.

The PGCI only has information about the program, such as the actual data position, recording and playback time information in the VOB. Alternatively, the VOB is recorded by being divided into units called a video object unit (VOBU), which is used as a random access position of the disc recording and reproducing apparatus.

FIG. 3 is a detailed view of the PGCI of FIG. 2 and includes PGC-GI, PGC_PGMAP, C_PBIT, and C_DTIT. PGC-GI (PGC General Information) consists of PGC_CNT which indicates the number of programs and the number of cells, PGC_PBTM which indicates the total playing time of all programs in PGCI, PGC_PGMAP_SA, C_PBIT_SA and C_DTIT_SA which indicates the starting address of several tables in PGCI. PGC_PGMAP (Program Chain Program Map) has an entry cell number of each program for every program in PGCI, and C_PBIT (Cell Playback Information) is a playback time of each cell for every cell in PGCI. C_PBTM indicating C_PBTM, C_F_VOBU_SA having the start address of the first VOBU of the cell, C_L_VOBU_SA having the start address of the last VOBU of the cell, and C_L_VOBU_EA having the last address of the last VOBU of the cell to indicate actual data belonging to each cell. It is composed. The Cell Date Information Table (C_DTIT) has date information recorded for each cell in the PGCI.

4 is a flowchart for automatically adding or inserting a program in real time in the apparatus for recording and reproducing audio and video data according to the present invention.

A program can be configured in various forms in the PGCI. In the present invention, one program is composed of one cell so that the number of cells and programs is the same, and the programs are sequentially recorded.

As shown in FIG. 4, first, when recording is started in the disc recording and reproducing apparatus, the system controller 112 initializes the AV codec 102 to obtain audio and video data recording time information recorded on the disc from the outside, In order to obtain sector address information indicating the position on the disc to be recorded, the DSP 104 is initialized to record the input audio and video data (step 410). When the recording is finished, the system controller 112 notifies the AV codec 102 and the DSP 104 of the end of recording, reads out the recording time indicating the time recorded from the AV codec 102, and immediately records the data from the DSP 104. It reads the sector address information of the area, that is, F_VOBU_SA, the start sector address of the first VOBU of the recorded area, L_VOBU_SA, the start sector address of the last VOBU of the recorded area, and L_VOBU_EA, the last sector address of the last VOBU of the recorded area. ). Here, the method of recognizing the recorded time information can be obtained in units of hours, minutes, seconds, and frames by encoding information in a frame unit when the general AV codec is video and in a unit of time in case of audio. In addition, since the DSP 104 configures a sector based on the sector address and the data input from the AV codec 102, various information on the sector address can be provided.

Next, it is checked whether the number of currently recorded programs is n or less (step 430). If the number exceeds n, the program is added to the existing program without adding a new program. This is because too many programs can be inconvenient to manage. In addition, if the number of programs is less than n, data recorded on another date is read to record the date of recording of the last recorded program in order to generate a new program, and it is checked whether it matches the current date (step 440). If the date is different, a new program is added (step 470). If the date is correct, the cell_PBTM of the last recorded program is read (step 450), and the sum of the cell_PBTM value and the recording time of the newly recorded data is constant. Check if the time is exceeded (step 460). This is to limit the maximum length of one program. At this time, the reference time may be input and stored by the user in the disc recording and reproducing apparatus or may have any value as a reasonable value. If a predetermined time is exceeded in step 460, a new program is added (step 470). If a predetermined time or less is added, an existing program is recorded (step 480). In case of adding a new program, first increase the number of programs and the number of cells by increasing PGC_CNT, update the recorded data by adding the recording time value to the previously recorded PGC_PBTM, and in CELL_PBTM Replace with the recording time value. In addition, the C_F_VOBU_SA, C_L_VOBU_SA, and C_L_VOBU_EA having sector address information for the cell are recorded with F_VOBU_SA, L_VOBU_SA, and L_VOBU_EA, which are sector address information for the recording data, respectively. By recording the date information of the newly created program, the PGCI is updated with the new program inserted and the operation of automatically inserting the program is terminated.

On the other hand, if a new program is not added, the data is recorded by adding the recording time value to the PGC_PBTM and CELL_PBTM that have been previously recorded, and only the C_L_VOBU_SA and C_L_VOBU_EA of the sector address information of the cell are read to L_VOBU_SA and L_VOBU_EA. By updating, you end the addition to the existing program.

5 shows a data structure in units of sectors recorded on a disc. Data encoded and output by the AV codec 102 of FIG. 1 is divided into 2048 byte units to be main data for one sector, and a data ID added thereto has a unique ID value for each sector including a sector address. do. This sector also includes an IED for detecting an error in the data ID and an EDC for detecting an error in the main data area.

6 shows a timing diagram between a picture start code and a sector address. That is, when analyzing the data output from the AV codec 102 in the DSP 104 of FIG. 1 to generate sector address information, the relationship between the picture start code (picture_start_code) of the MPEG data and the corresponding sector address is shown. . Sector units distinguished by the DSP 104 are not taken into account when encoding in the AV codec 102. Therefore, the picture start code encoded by the AV codec 102 may exist across sectors and sectors. In this case, the sector address corresponding to the picture start code is valid at the start of the picture start code.

7 is a flowchart illustrating a method of detecting a sector address in the DSP 104 of FIG. 1.

First, a picture start code (picture_start_code) defined in the MPEG video is detected from the input data (step 712), and it is checked whether the detected picture is an I (Intra) picture defined in the MPEG video (step 714). This is to make a frame encoded by an I picture as a reference for data recording units when recording audio and video. If an I picture is detected, a valid sector address is stored in the first VOBU start address, F_VOBU_SA, as shown in FIG. 6 when the picture start code is detected (step 716). This process is performed only the first time of successive write operations. Next, as in steps 712 and 714, the next I picture is detected (steps 718 and 720), and the detected I picture is assumed to belong to the last VOBU of the continuous recording data, as shown in FIG. When a picture start code is detected, a valid sector address is stored in L_VOUB_SA, which is the last VOBU start address (step 722). This assumption is that if recording continues, L_VOUB_SA is continuously changed and corrected to the correct value. At this time, it is checked whether the sector address detection operation is terminated (step 724). (Step 726, 728). Here, the inspection of the end of the I picture detection and the end of the sector address detection operation is repeated. If the I picture is detected, the L_VOUB_SA value is modified to match the picture start code of the newly detected I picture, and the same operation is repeated. If the sector address detection operation is completed, the current sector address is stored in L_VOBU_EA indicating the last address of the last VOBU (step 730).

As described above, according to the present invention, in recording and reproducing audio and video data using a disc, program information recorded during disc reproduction by automatically adding a program in real time and providing random access position information for the recorded program. High-speed search is possible in a certain amount of data units using.

Claims (11)

An apparatus for recording audio and video data on a rewritable disc, A codec unit for encoding audio and video data and generating time information corresponding to the data; A digital signal processor for classifying audio and video data generated by the codec unit in units of sectors and detecting sector address information at a position corresponding to specific data while searching contents of input audio and video data; And a system controller configured to set the video and audio data in units of programs according to time information and sector address information generated by the codec unit and the digital signal processor unit, and record information added thereto in real time. Disc burner. The method of claim 1, wherein the sector address information detection is performed. Detects an I picture defined in MPEG among the input data, sets the sector address belonging to the detected position as the first starting address, and detects the next I picture, and sets the sector address belonging to the detected position as the last starting address. And when the sector address detection ends, setting the current sector address to the last address. The disk recording apparatus according to claim 2, wherein if the I picture is detected without detecting the sector address, the last start address is set to be corrected by a sector address belonging to the position where the I picture is detected. The disc recording apparatus according to claim 1, wherein the codec unit generates a recording time by encoding a frame unit for video and a unit of time for audio. In a method of adding a certain amount of program in real time while recording audio and video data on a rewritable disc, (a) recording audio and video data on the disc; (b) reading a recording time corresponding to the time recorded in step (a) and sector address information corresponding to the recorded area to confirm the recorded program; (c) Add a program if the recording date and the current date of the last recorded program in step (b) are different or the sum of the recording time of the last recorded program and the recording time of the currently recorded data exceeds a certain time. And recording the data. 6. The disk recording method according to claim 5, further comprising the step of checking the number of programs recorded in step (b) to add a program if the number is less than a predetermined number and to add the program to a previous program if the number is more than a predetermined number. 7. The disc recording method according to claim 6, wherein additional information about the added program is recorded together. 8. The disc recording method according to claim 7, wherein the additional information is the number of programs, program recording and playback time, position information of recorded data, and date information of a program. The method according to claim 5, wherein the recording date of the data recorded in the step (a) is the same as the recording date of the last recorded program or the sum of the current recording time and the last recorded program in the step (c) is fixed. If it does not exceed, further comprising the step of modifying the recording time and position information of the data currently recorded in the last recorded program to add to the previous program. 6. The disc recording method according to claim 5, wherein the reference constant time of step (c) is an arbitrary value recorded by the user in the disc recording and reproducing apparatus. The method of claim 5, wherein the program of step (c) is added. Increasing the program link count increases the number of programs and the number of cells that are recording and playback units by one, and adds the recording time value of the recorded data to the previously recorded program connection play time, Replace with the recording time value, And writing the sector address value of the recording data into the sector address for the cell, and recording the date information of the newly created program, thereby updating the program connection information in the form of inserting a new program.