KR970010531B1 - Disc recording media and reproducing method thereof - Google Patents

Abstract

Disk recording media includes the table region having initial address value set in advance from starting address of program region and recording the index table made up of plural index and address information; the first data region putting initial address on the address information of index corresponding to it among the index table of table region and the second plural programs made of the first data to corresponding to the order of the plural indexes in index table; the second data region composing the second data and the first plural programs made of the order table of the first programs relevant to the second data and havings the regular size(S), and initial address puts on the second address value set in advance from starting address of program region.

Description

Disc record carrier and its playback method

1 is a diagram showing a data structure of a Q subcode channel of a compact disc.

2 is a diagram showing an example of a content table of a Q subcode channel according to the present invention.

3 is a diagram for explaining the format of a program area of a compact disc according to the present invention;

FIG. 4 shows an example of a disc description recorded in the disc description area of FIG.

FIG. 5 shows an example of an index table recorded in the table area of FIG.

FIG. 6 is a diagram showing an example of a first program recorded in the first data area of FIG.

FIG. 7 is a diagram showing an example of a second program recorded in the second data area of FIG.

8 is a diagram for explaining a method for reproducing a disc recording medium according to the present invention.

9 is a block diagram of a reproducing apparatus of a disc recording medium according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording medium and a reproduction method thereof, and more particularly to a compact disc having a new signal format (hereinafter referred to as a CD) and a reproduction method thereof.

CD is a recording medium that can store optically modulated digital data signal on a disc of 12cm in diameter with a large capacity (up to 800M bytes). It is used for audio CD-DA, which contains digital audio data, digital audio data, text data and graphic data. CD-G and CD-EG, which include lyrics and graphic backgrounds as well as audio, and CDV, which contains digital audio and video data. In addition, CD-ROMs containing computer data for use in databases, electronic publishing, etc., CD-ROMs for audio, video, text and computer data used for databases, electronic publishing, etc., audio, video, text and CD-I used for multimedia and the like by recording computer data. The physical recording format of such CDs is based on the recording format of CD-DA. The data recording area of the CD is roughly divided into a lead-in area (LIA), a program area (PMA), and a lead-out area (LOA). The CD-DA records the digital audio data signals in the PMA and the program's time contents, that is, the table of contents information, in the LIA. Therefore, the CD player reads the table of contents recorded in the LIA prior to the playback, seeks the selected program, and plays the program. The LIA has eight subcode channels called P, Q, R, S, T, U, V, and W. The table of contents information uses the Q channel and displays the song number and index of up to 99 programs from 1 to 99. CD-G adds a graphic function that displays karaoke lyrics and song images using R-W subcode channels not used in CD-DA. Since DC-DA or CD-G installs the PMA program referring to the contents of the LIA, the number of programs that can be included in the PMA is limited. For example, the maximum capacity of one CD is 800M bytes, so 8,000 still pictures of 100K bytes can be recorded. Therefore, 8,000 catalog information cannot be included in the LIA. The CD-ROM and CD-I reconstruct and record or process audio data blocks consisting of 98 frames, which are data processing units of CD-DA, in sector units. The CD-ROM driver is connected to a host computer (personal computer) to perform playback operation dependently by a CD-ROM fate program mounted on the hard disk or floppy disk of the host computer. Therefore, since a CD-ROM requires the use of a specific host computer, compatibility between systems is inevitably required, and thus it is limited to spread in each home. In order to make up for the shortcomings of the CD-ROM, the CD-I has a computer, a character playback circuit, an image playback circuit, an audio playback circuit and a computer data playback circuit. It is solved. In other words, the CD-I system is a reproduction-only computer in which the hard disk or floppy disk of the computer is replaced with the CD-I disk. Such a CD-I system can access virtual data only by operating programs on disk in an operating system environment. Therefore, specific OS and applications are inevitably required. It has the drawback of rising cost. In addition, it is inconvenient that a computer cannot directly access a data location stored on a disk, but must be accessed through an OS or an application program.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk recording medium having a new CD recording format that can contain a large number of programs and can be accessed at the microcomputer level without a specific OS or application program. have.

Another object of the present invention is to provide a disc reproducing method for directly accessing and reproducing program data from the disc medium.

A disc recording medium of the present invention for achieving the above object comprises a disc recording medium having a lead-in area, a program area and a lead-out area, wherein the program area is at least an initial address of which is determined from a start address of the program area in advance. A table area provided with one address value and having an index table composed of a plurality of indexes and address information; A first data area in which a plurality of second programs composed of first data are recorded such that an initial address is given as address information of a corresponding index in the index table of the table area and corresponds to an order of a plurality of indexes in the index table; And a plurality of first programs having a predetermined size (S), comprising a sequence table of the first programs related to the second data and the second data, wherein an initial address is previously determined from the start address of the program area. And a second data area given by the address value.

A reproducing method of the present invention is a reproducing method of a disc recording medium having a lead-in area, a program area including at least a table area and first and second data areas, and a lead-out area, wherein the lead-in area of the disc recording medium. Reading a content table from the program area to obtain start address information of the program area, reading an index table from the table area having an initial address already given from the start address, and storing the index table in a first memory area; The initial address of the second program corresponding to the selected number is calculated by the formula MAi = C (i-1) S (where C is an already given initial address value of the second data area and S is the size of the second programs). Doing; Reading a second program having the calculated address value as an initial address from the second data area and storing the second program in a second memory area; The initial address of the first program corresponding to the index after the index of the second program according to the order table of the second programs stored in the second memory area is referred to by referring to the index table of the first memory computer. Reading a first program having the referenced address as an initial address from the first data area and storing the first program in a third memory area; And digitally analog converting and synchronizing the second data of the second program stored in the second memory area with the first data of the first program stored in the third memory area.

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

The disc recording medium of the present invention has a lead-in area (LIA), a program area (PMA), and a lead-out area (LOA) as in the case of a conventional CD-DA disc. 1 shows the data structure of a Q channel in LIA. A 98-bit Q-channel data structure consisting of the second channel bits of eight channels of P, Q, R, S, T, U, V, and W of 98 frames consists of 96 bits except the first 2 bits of sync bits. There are 72 bits of data bits followed by 4 bits of control bits and 4 bits of address bits. Data bits include 8-bit track number codes (TNRs), 8-bit pointers, and 24-bit addresses (minutes, seconds, frames). It consists of 8-bit interval bits (Zero) and 24-bit pointer addresses (PMIN, PSEC, PFRAME). The data bit is followed by a 16-bit CRC code. In LIA, the track number code (TNR) of the Q channel is decimal zero. In the LIA, the contents of the contents recorded on the disk, that is, the contents table (TOC) are recorded. The TOC consists of a pointer and a pointer address of the Q channel. The pointer address indicates the minutes, seconds, and frame values of the start pointer of each program of the PMA having a specific track number.

2 shows an example of a TOC according to the present invention. When the pointer value is 1, the minute data of the PMIN indicates the initial address of the first track of the program area. When the pointer value is A0, PMIN indicates the first track number in the program area. When the pointer value is A1, PMIN indicates the last track number in the program area. When pointer value A2, PMIN minute data indicates the start address of LOA. Therefore, as described above, the TOC configuration of the present invention has one track number and the values of the pointers 01, A0, and A1 are the same.

Referring to FIG. 3, the program area PMA of an embodiment according to the present invention is largely divided into a disc label area 10, a disc description area 12, a table area 14, and a first data area of a CD-ROM. 16) a second data area 18; At least one CD-DA track may be included between the second data area and the LOA. In this case, a pointer and an address of this track are additionally set in the TOC. Here, the disc label area 10 adopts the ISO 9660 format that defines the well-known CD-ROM format.

Referring to FIG. 4, the disc description area 12 has a predetermined time interval, i.e., an absolute address, as an initial address A from the start address of the program area 00 minutes 00 seconds 00 frames. The disc identification and version number are recorded in ASIii code. It consists of two sectors in mode 1 of the CD-ROM format.

Referring to FIG. 5, the table area 14 constitutes a table composed of the numbers, initial addresses, and characteristic information of each first program of the first data area 16, and has an initial address B. It consists of an initial address of a second program consisting of an index, one byte of minute, one byte of second, and one byte of frame, and characteristic information of each first program of one byte. The one-byte feature information is, for example, information for indicating a group of first programs as shown. Therefore, if you calculate the number of sectors required,

(6 bytes * 4000 program) / 2048 = 11.78

Therefore, mode 1 sector in CD-ROM format takes 12 sectors.

Referring to FIG. 6, the first data area 16 is an area in which a plurality of first programs P1, P2, P3,..., Pn are sequentially recorded in index number order. Each first program is, for example, still picture information, 2 bytes of pixel information of 1 bit of start bit and 15 bits of RGB555 code, and 2 bytes of run length information of 1 bit of continuous bit and 15 bits of run length code. The image information of 360 dots * 240 lines is compressed and recorded. Therefore, the first program takes (360 * 240 * 2) /2048=84.37 sectors when coding with RGB555, but when run-language coding, it is compressed to about 40 sectors in the case of naturalization and greatly compressed in the case of graphic screen. It is compressed to about 5 sectors. Therefore, a maximum of 400 megabytes would be required to record 4000 naturalized cuts.

Referring to FIG. 7, a plurality of second programs having a constant same size S are recorded in the second data area 18, and each of the second programs may be classified into a header 22, a body 24, and a Taylor ( 26). The header 22 has a plurality of pointers for specifying the 'CD-K' identification information, the initial address of the body 24, the initial address of the order table, and the initial address of the taylor 26. The body 24 has a second data 24a and an order table 24b of the first programs associated with this data. For example, if the first data is a piece of MIDI data, the order table is information consisting of indices of corresponding first programs of the first data area to form a background image in which the screen changes for each measure of the song. The first data may include character data or font data of the character in addition to the MIDI data. Here, the text data may be lyrics data of a song, and the font data may be Korean font, Japanese font, Chinese character font, English font, or the like. In this case, a pointer value for designating an initial address of character data or font data will be set in the header 22. The initial address of these second programs is obtained by the following equation (1).

MAi = C + (i-1) S... … … … … … … … … … … (One)

Where C is the initial address value of the second data area and S is the size of the first program. C and S can be set in advance in the TOC of the LIA area. For example, the minute data of the pointers A1 and A2 in FIG. 2 can be retained, and the second and frame data can be set as the information of the C and S values. Alternatively, it may be set in advance on the operation program of the playback apparatus. Therefore, in the present invention, the second programs can calculate and access the initial address of the second program by operation without having to create a separate index table.

A method of reproducing a disc recording medium having such a signal format will be described below with reference to FIG.

The playback method of the disc recording medium of the present invention reads the contents table TOC from the lead-in area LIA of the disc recording medium at the beginning of the playback, and starts the address information of the program area PMA (00 minutes 00 seconds 00). Frame) and the disc description information and the index table from the disc description area 12 and the table area 14 having the first and second initial addresses A and B from this start address, and the index table reads the first memory area. Save to 30.

Then, for example, if No. 3 is selected, the address MA3 corresponding to the number i = 3 of the selected second program M3 is calculated by the above equation (1). Accordingly, the second program M3 having MA3 as the start address is read from the second data area 18 of the disc recording medium by MA3 = C + (3-1) S and stored in the second memory area 32. . Order of the order table 24b by referring to the order table 24b stored in the second memory area 32 by a pointer value designating the initial address of the order table from the header 22 of the second program (G1-G1-). G2-G1 -...) by the above formula (1), C, C + S, C + 3S, C + 2S, ... The first programs P1, P2, P4, P1, ... having the initial address are sequentially read from the first data area 16 of the disc recording medium and stored in the third memory area 34. FIG. The first data P1 stored in the third memory area 34 associated with the second data U1 stored in the second memory area 32 is digitally analog-converted and output in synchronization. In this manner, the first and second data are output by the same method until the output of the second data is finished.

As described above, the disc recording medium of the present invention does not record every data signal constituting a program for each program, but records the basic data signal elements constituting all programs in a separate area, and each program is a sequence of these data signal elements. By configuring indexes according to the combination, redundant data can be eliminated, so more programs can be stored on a single disk, and a table of programs and data can be written to the PMA to create a program several tens of times larger than the TOC's 99 programs. You can record the table of contents.

According to the reproducing method of the present invention, the reading time of the contents table from the LIA is very short, and since the data signal in the program can be known in advance on the disk, the next data signal can be read and waited at the time of outputting the current data signal. The access time of the playback signal outputted from the disk can be performed at high speed, and the microcomputer or processor can know the data address through the table, so there is no need for a separate OS or application program.

Referring to Fig. 9, the reproducing apparatus for reproducing a disc recording medium according to the present invention is configured to be compatible with an existing CD disc. Disc playback apparatus of the present invention largely CD playback means (100). CD-ROM coding means 500, the main control unit 200, the memory 300 and the signal conversion means 400. The CD reproducing means 100 picks up the optically modulated data signal from the disc 110 via the pickup means 130, decodes it in the DSP means 150, outputs the decoded CD data signal, and inputs the key input means 170. The program selection signal according to key input through the microcomputer 160 is configured in the same manner as the existing CD player. The sub means 140 performs a tracking servo of the spindle motor 120 and the pickup means 130. The decoding means 500 receives the CD playback signal and descrambles it, outputs data by performing a predetermined error detection and error correction on the obtained signal. The decoding means 500 is for decoding the mode 1 format data signal of the CD-ROM format from the CD reproduction signal. The main control unit 200 outputs the data and the index table from the input data, transmits initial address information of the corresponding program to the microcomputer 160 in response to the program selection signal transmitted from the microcomputer 160, and the data signal of the selected program. Outputs The memory means 300 stores the index table in the first memory area 30, stores the accessed second program in the second memory area 32, and stores the accessed first program in the third memory area 34. Save it. In this case, the first to second memory areas may include RAM, and the third memory area may include video RAM. The signal conversion means 400 converts the first and second data signals sequentially read out into a predetermined reproduction output signal for output to the output device. The signal converting means 400 is largely divided into an audio output stage 401 and a video output stage 420. The audio output stage includes a MIDI sound processor 412 for inputting second data and outputting an audio signal, a converter 414 for digital-analog converting a CD-DA signal, and a selector 416 for selecting MIDI and CD playback sounds. . The video output terminal 420 is a video processor 422 for inputting first data and outputting a TV signal, and a text processor 424 for inputting text information that may be included with the second data to generate a text image signal, and the TV signal. And a mixer 426 for mixing a video signal and outputting a video signal.

As described above, the playback apparatus of the present invention can know the position of the data signal of the disc in advance by the microcomputer and the control processor, so that the next signal can be picked up and waited in advance when the current signal is output, so that the output access time can be performed at high speed. . In addition, since the playback system does not need to have a separate operating system, the production cost can be lowered and existing CD-DA discs can be played.

As described above, the present invention can store more programs in one disk, thereby maximizing disk storage efficiency, and providing fast access because the microcomputer and processor can directly know the data address on the disk without the need of a separate operating system environment. It is economical because it can lower the production cost.

Further, according to the present invention, the data signal can be configured for each still picture group, sound source group, and font group, and the program can be configured in an ordered combination of data signals read out from these three groups, thereby satisfying various programs in each application field. That is, the entertainment fields of game programs, karaoke programs, and music programs, educational fields such as interactive educational programs, animation and fairy tale programs, electronic publishing fields such as electronic dictionaries, electronic magazines and electronic books, product catalog propaganda programs, It can be applied to fields such as tourist information program and portable electronic map program. That is, it is very advantageous in that the defects of the existing CD-ROM and CD-I can be secured so that a variety of programs can be embedded in a single disk and can be supplied at a lower cost.

Claims (6)

A disc recording medium having a lead-in area, a program area, and a lead-out area, wherein the program area includes at least an initial address, the first address being given from a start address of the program area, and a plurality of index and address information. A table area in which an index table is constructed; A first data area in which a plurality of second programs composed of first data are recorded such that an initial address is given as address information of a corresponding index in the index table of the table area and corresponds to an order of a plurality of indexes in the index table; And a plurality of first programs having a predetermined size (S), comprising a sequence table of the first programs related to the second data and the second data, wherein an initial address is previously determined from the start address of the program area. And a second data area given by an address value. The disk recording medium of claim 1, wherein the first data is image data. 3. The disc recording medium of claim 2, wherein the image data is RGBnnn coded and data compressed in a run-length manner. The disk recording medium of claim 1, wherein the second data is a combination of at least one of MIDI data, lyrics data and font data. 2. The program area of claim 1, wherein an initial address is given between the disc label area of the CD-ROM and the first table area by a second address value predetermined from the start address of the program area, and the description information of the disc is provided. And a disc description area to be recorded. A method of reproducing a disc recording medium having a lead-in area, a program area including at least a table area and first and second data areas, and a lead-out area, wherein the contents table is read from the lead-in area of the disc recording medium. Obtaining start address information of the program area and reading an index table from the table area having an initial address already given from the start address and storing the index table in a first memory area; The initial address of the second program corresponding to the selected number is calculated by the formula PAi = C + (i-1) S (where C is an already given initial address value of the second data area and S is the size of the second programs). Doing; Reading a second program having the calculated address value as an initial address from the second data area and storing the second program in a second memory area; After reading the index of the first program according to the order table among the second programs stored in the second memory area, the initial address of the first program corresponding to the index is found with reference to the index table of the first memory area. Storing a first program having the referenced address as an initial address in a third memory area read from the first data area; And digitally converting and synchronously outputting the second data of the second program stored in the second memory area and the first data of the first program stored in the third memory area and synchronously outputting the same. Way.