JPH07287877A - Recording medium for cd mastering - Google Patents

Abstract

PURPOSE:To deal with formation of CDs of all fields by forming a mastering format capable of executing recording with a single recording medium by using a recording medium having a structure consisting of at least a file header, TOC information table, CD information data and file end mark. CONSTITUTION:The recording medium having the structure consisting of at least the file header, TOC information table, CD information data and file end mark is used as the CD mastering recording medium in which various kinds of the data to be recorded on the CDs are included. The file header stores the data indicating the outline information over the entire part of the files. The files are one piece per one mastering file in order to preserve the data in the native form in the plural files. Then, the file head is one piece as well. The TOC information table is data for controlling the CD information. The data, such as data for musical tones, and data of CD-ROMs, etc., such as CD-G and CD-1, are included in the CD information data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium having a mastering format for creating a CD medium corresponding to various formats.

[0002]

2. Description of the Related Art CD has been developed as a medium capable of digitally recording and reproducing sound, and has been developed as an audio disk capable of reproducing faithful sound and continuously reproducing for a long time. After that, focusing on large capacity and high-speed access performance,
It is also used as a recording medium for computers.

The standard of the data structure as a computer recording medium is defined based on the standard of CD audio. The data structure of the CD audio disc will be described below.

The L / R voice signal is PCM-modulated to obtain 16
Obtain digital data of bit × 2 channels. 24 bytes of digital data in 6 sample sections are in 1 frame units. For the purpose of suppressing errors, when data is converted in units of L / R 12 bytes, an error correction code is entered and interleaved, 8 bits × 12 data and 8 bits × 4 parity are respectively obtained. A 1-byte subcode is added to 1 frame, and a digital signal obtained by modulation is recorded on a CD.

98 frames form one subcode block. The first 2 bytes are the subcode header,
The remaining 96 bytes are the subcode 8 channels. Of the subcode, 24 bytes are used for read control,
Address information for searching, such as the type of user data, absolute time, and subcode frame number, is recorded. 1
The data attached to one subcode block is 2352.
Equivalent to the amount of information in bytes.

In order to reproduce a specific piece of music with a CD audio disk reproducing apparatus, a subcode is searched for and demodulated by using an index located at the innermost circumference of the disk as a clue, and a target block is searched by the absolute time of the subcode. The read digital signal is demodulated, error correction is performed by deinterleaving and error correction code, and digital signal processing is performed to obtain digital data. The digital data is processed by the D / A converter and output as an audio signal.

FIG. 1 shows a standard of a physical format of a CD-ROM which has become a unified standard when a CD is used as a computer recording medium. As the physical format, three kinds of modes of mode 0, mode 1 and mode 2 are defined.
One sector of the CD-ROM is composed of 2352 bytes of data which is equal to a subcode block of a CD audio disc, and a 12-byte block sync signal (sync) is placed at the beginning of each block to separate the blocks. ing.

Following the block synchronization signal, a header of 4 bytes is arranged, which is composed of a block address of 3 bytes and a data recording mode of 1 byte. In mode 0 and mode 2, the remaining 2336 bytes are the data area. In mode 0, this data is all 0s.

Mode 1 is used for computer data that requires more accurate error correction. Program data, image data having a high compression rate, and the like cannot operate normally even with a 1-bit error. Unlike such image data or acoustic data that can be interpolated, such data is not allowed to have errors.

In order to improve the reliability of the data of the CD-ROM, the auxiliary data area is set in the data structure of 2336 bytes, and the user data 2048 bytes and the auxiliary data 28
Divided into 8 bytes. The setting of auxiliary data is defined by setting the data recording mode to mode 1. 288 bytes of auxiliary data are 4 bytes for error detection,
The error correction is 276 bytes including 8 bytes of space, 172 bytes of P parity and 104 bytes of Q parity.

Mode 2 has a data structure in which 2336 bytes are all user data, and image / sound data and the like which can be error-corrected by interpolation processing can be recorded. However, in general, define the structure in the user data of mode 2,
The physical format is expanded and the data structure of mode 2 is used when performing time division processing of various data.

The program data and the like have a large number of consecutive redundant codes of the same code, and read errors are likely to occur. Therefore, in the block of 2352 bytes in which the sync data, the header data, and the auxiliary data data are added to the user data, the scrambling process is performed while leaving the sync data to eliminate the redundant code.

After the scramble process, like the CD audio disc, an error correction code is inserted and interleaved, a subcode is added, and a digital signal obtained by modulation is recorded in a CD-ROM.

The subcode corresponds to the structure of the CD audio disc, and one having a size of 8 channels × 12 bytes is added to one block. Of these, two channels are used for read control, and address information for searching, such as the type of user data, absolute time, and subcode frame number, is recorded.

Since the obtained digital data is scrambled, the sync in the data block is detected to descramble the data, the header address is detected, and then the target block is accessed. After the error detection and correction using the auxiliary data is performed according to the data structure mode in the header, the user data is read into the computer. The reliability of data is enhanced by such a two-step error correction function.

The CD having the above functions is currently used in various ways. For example, it has the same diameter as a music CD, a karaoke CD (CD-G), an interactive CD (CD-I) containing sounds and images, a photo CD (photo CD), and a music CD. A read-only CD (C that contains code information instead of audio information in the CD
D-ROM).

To mass-produce these CDs, a software development maker (software vendor) requests the CD maker to produce a CD. At that time, the original data for creating the CD was recorded in an external storage medium in a format originally developed by each company and passed to the CD manufacturer. This format is called a mastering format.

Since the mastering format varies depending on the purpose of use even for the same software vendor, it is necessary to divide the storage medium into a plurality and hand it over to the CD manufacturer.

For example, a CD-ROM for a personal computer is a hard disk, a CD analog tape for music, a CD-ROM for a PC engine is a digital tape, and a C for karaoke.
D is an MO disc, and so on.

[0020]

The above-mentioned conventional CD producing method has no problem if a CD containing only a single data type, for example, a CD containing only music is produced. However, when the combination of images and music and animation and music has been increasing in recent years, the variety of these combinations makes the procedure of transferring the storage medium between them complicated.

Moreover, the CD manufacturer has the inconvenience of having to prepare various conversion tools for each format because the format is different for each company. Moreover, due to different storage media and formats, CD
The manufacturer often takes the lead in determining the details of the CD,
The CD required by the software vendor was not always created once.

The problem with the conventional CD manufacturing procedure is that the CD originally has its origin as an audio center.
This is due to the fact that it was not compatible with new CD usage methods such as CD-ROM. It is an object of the present invention to create a mastering format that can be recorded on a single storage medium so that it can be used for CD creation in all fields.

[0023]

In order to solve the above-mentioned problems, the present invention uses at least a file header and a TOC.
A recording medium having a structure including an information table, CD information data, and a file end mark is used.

The file header stores data indicating summary information of the entire file. For example, CD lead time or TOC size. In the conventional mastering storage medium, the data is stored by changing the file for each different information, but in the present invention, one file is provided for each mastering file in order to save the data in a plurality of files in a native form. Therefore, there is only one file header.

The TOC information table is data for controlling CD information data. From this information, it is possible to know which CD information data starts from where, what format it is stored in, and what kind of data.

The CD information data is the original CD data. Among them are music, CD-G, CD-I, and various CDs.
-Includes data such as ROM. Because what kind of it is and how long it is stored from where,
You can see it in the TOC information table. Therefore, raw CD data is listed here in its original form.

The file end mark is a mark indicating the end of the file. It corresponds to the file header, and there is one per file.

[0028]

EXAMPLE As an example of the present invention, as shown in FIG.
An example of creating a mastering file on a mm tape will be described.

A file header is provided at the beginning of the tape.
The length is 256 bytes, which includes the CD lead time (mm: ss: ff) and the TOC information table length (n.
nnnnnn), the maximum number of tracks (nn), the date of recording the tape (yy / mm / dd), the time of recording the tape (hh: mm: ss), and the like are recorded. The letters in brackets represent ASCII letters.

As a CD information table, information for each index is recorded as a unit and the set is recorded as a TOC information table. In this table, binary data is constructed in units of 16 bytes for each index.
Therefore, the size of the TOC information table is 16 bytes × n.

FIG. 3 shows an example of the TOC information table. Both the track number and the index number are 1 byte, and indicate the track number and the index number of the stored CD-ROM data. The control represents the type of information stored in one track. For example, bit
If 4 is 1, information such as that the Emphasizing circuit is used during CD-DA reproduction is shown in bit units.

The data format is represented by the mode and tape recording format. For example, the mode is 0000 and the tape recording format is 00
If it is 00, the meaning is expressed by a combination of bits such that the data is not recorded on the tape by the CD-DA. By this, various CD data formats are expressed.

The subheader information and the subcode information store information on the subheader. However, this information is valid only in the CD-ROM mode 2.

The data start position is represented by 1 byte for each of the start position minutes, seconds and frames. The data length is 1 for each of the required time of data as minutes, seconds, and frame values.
It is expressed in bytes.

The CD-ROM data is stored as one block of eight records. The number of bytes for one frame of the CD-ROM database is recorded by switching to the number of bytes according to the value of the data format, subheader information, and subcode format for each index.

FIG. 4 shows the number of bytes in one frame for each data format, but the data length is variable.
It should be noted that, although "CD-ROM data" is used here, audio data and the like are also included in this. In this figure, CD-D
A corresponds to audio.

The file mark of the tape is a mark indicating the end of the tape. In the present invention, all data formats are 1
Since it is stored in the storage medium, this mark is naturally one. FIG. 5 shows an example in which data is recorded on the tape of the present invention.

[0038]

According to the present invention, it becomes possible to record all types of CD records on one storage medium. As a result, the CD production process can be shortened. Moreover, since it does not go through a complicated process, it is possible to create a CD as the software vendor expects.

On the other hand, a CD manufacturer does not need a complicated process, and a variety of conversion tools prepared for a variety of conventional CD formats are not required.

The present invention is a music CD, C currently on the market.
Not only is it compatible with DG, CD-I, and various CD-ROMs, but it is also flexible enough to support new CD usages in the future.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a CD-ROM format standard.

FIG. 2 is an explanatory diagram of an example of a mastering format created on an 8 mm tape in an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a TOC information table according to the embodiment of this invention.

FIG. 4 is an explanatory diagram of a recording format of CR-ROM data according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram of recording on a tape according to the embodiment of the present invention.

Claims (1)

[Claims] 1. A recording medium for CD mastering containing various data recorded on a CD, comprising at least (1)
A file header containing data showing the summary information of the entire file in which the lead time of the CD, the length of the TOC information table, the maximum number of tracks, the date, the time, etc. are recorded. (2) One unit of information for each index As a data format, a TOC information table consisting of data for controlling CD information data represented by a mode and a recording format, (3) CD
CD information data including the data recorded in (4) a file end mark which is a mark indicating the end of the tape,
A recording medium for CD mastering, which has a CD mastering format structure provided with.