JPH07111069A - Cd-rom - Google Patents

Abstract

PURPOSE:To obtain a CD-ROM provided with the management means of an application software composed of plural pairs of CD-ROMs. CONSTITUTION:A decision is performed by using a means performing inquiries of ID information while recording intrinsic ID information of each CD-ROM at every sheet of plural pairs of CD-ROMs. For example, ID information and the means performing inquiries of information are recorded respectively in the TOC of the innermost peripheral of the disk and in the data block of a read-in area. In a reproducing device provided with a disk driving part, a system controller, a CPU. a video signal processing part and a voice signal processing part, etc., ID information and the means performing inquiries of ID information are stored respectively in a memory accompanying to the system controller, etc., and in a memory accompanying to the system controller or the CPU. The system controller receives the decision result of ID information and then outputs a signal for starting or stopping data read-in to circuits and the message for an user is outputted.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a CD-ROM and a CD.
-Relating to a ROM reproducing device.

[0002]

2. Description of the Related Art An optical compact disc was developed as a medium capable of digitally recording and reproducing voice, and has become popular as a CD audio disc capable of reproducing faithful sound and continuously reproducing for a long time. Furthermore, with a focus on large capacity and high-speed access performance, its use as a computer recording medium is being promoted.

A typical example of using an optical compact disc as a recording medium is a CD-ROM whose physical format is a unified standard. FIG. 1 shows an explanatory diagram of the data structure of the CD-ROM. CD-RO
One sector of M has a data amount of 2352 bytes which is equal to a subcode block of a CD audio disc, and a header consisting of 12 bytes of sync at the beginning of the block, 3 bytes indicating a block address and 1 byte indicating a data recording mode. is there. The actual recordable data amount is 2336 bytes excluding the sync and header.

Program data, image data having a high compression rate, etc. cannot operate normally due to a 1-bit error. Such data, unlike image data or sound data that can be interpolated, does not allow errors. C
In order to improve the reliability of the data of the D-ROM, an auxiliary data area is set in the data structure of 2336 bytes and divided into 2048 bytes of user data and 288 bytes of auxiliary data.

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, 8 bytes for space, 172 bytes for P parity and 104 for Q parity.
Error correction consisting of bytes is 276 bytes.

[0006] 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,
Generally, the structure is defined in the user data of mode 2, the physical format is extended, 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 having the same code, and thus a read error is 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 scrambling, an error correction code is inserted and interleaved, then 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. P and Q of them
2 channels used for read control are used to record address information for searching, such as the type of user data, absolute time, and subcode frame number.

In order to access the data recorded in the CD-ROM, first, index information called TOC recorded in the subcode area at the innermost circumference of the disc is read and held in the system controller. When receiving the data read request, the system controller refers to the index information held therein and outputs a control signal for moving the optical head. The optical head moves to the track containing the target data block.

First, the subcode is read from the target track and demodulated, and the optical head is moved to the target data block according to 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.

Since the obtained digital data is scrambled unlike the digital signal and audio signal of the audio disc, the sync in the data block is detected to descramble and the header address is detected. The same as the absolute time in the subcode is recorded in the header address.

The target block is accessed based on the detected header address together with the absolute time of the subcode. 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-ROM has a data transfer rate and C
Basically, the D reading means, the digital signal processing circuit, and the like are similar to those of the audio disk, and are used as a shared machine. Since it is originally derived from an audio disc, the reading means of most audio disc application CDs also serves as an audio disc reproducing device.

An outline of a shared machine capable of reproducing an audio disc and a CD-ROM will be described. The reproducing device is composed of a disk drive unit, a video signal processing unit, an audio signal processing unit, a system controller, an operation unit, and a CPU.

The disk drive unit performs descrambling and error correction in addition to a motor for rotating the disk and an optical head, a circuit for performing normal digital signal processing such as waveform shaping, DA conversion, signal demodulation, and error correction. There is a circuit. The video signal processing unit has a decompression circuit for various compressed data and a synthesizing circuit. The audio signal processing unit is composed of DA conversion and a filter via an ADPCM data expansion circuit.

The system controller receives an input from a push button or the like or a signal from each circuit from the operation unit, and mainly controls the disk drive circuit. A ROM having control software written therein is attached to the CPU, and when the power is turned on, the control software read by the computer is read to control the video signal processing unit, the audio signal processing unit, and the system controller.

The CD is manufactured according to various uses.
A combination of a ROM reproduction device and a CD-ROM is used for multimedia such as moving image reproduction, electronic dictionaries, and game devices.

[0018]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
M is used as a large-capacity storage medium in various fields. However, there is a problem with lack of capacity to support application software with complicated functions, or software intended for long-term continuous high-quality video playback, high-quality video and audio continuous playback, etc. May be.

There are a plurality of sets of audio discs, and for reproducing karaoke or the like, there is also an apparatus called an autochanger that manages a plurality of CDs and can control the reproduction of a target track of an arbitrary CD. Like a floppy disk using a magnetic disk, it has a plurality of disk drives for driving a CD-ROM, and an arbitrary CD-RO
There is also a device that can specify and read the file written in M.

However, the conventional management of plural sets of CDs is as follows.
Each CD is independent and does not take into consideration the overall management of the product completed by multiple CDs. It is only managed by the user grasping the contents of each CD and operating the reading designation.

The present invention is a CD provided with a means for managing application software consisting of a plurality of sets of CD-ROMs.
-To provide a ROM reproducing device.

[0022]

In order to solve the above problems, unique ID information is recorded in each CD-ROM together with application software in a plurality of sets of CD-ROMs, and when starting data reading, the ID information is stored. The CD-ROM is judged using a means for inquiring information. The ID information is recorded together with the TOC in the subcode area, particularly the innermost circumference of the disc so that the ID information is reproduced prior to the data.

The CD-ROM reproducing device of the present invention comprises a disk drive unit, a system controller, an operation unit, a CPU, a video signal processing unit, an audio signal processing unit and the like. The read ID information is held in the system controller or the like. The means for inquiring the ID information is stored in the system controller controlling the circuit operation or the memory attached to the CPU. System controller is ID
In response to the information determination result, a signal for starting data reading or stopping optical head scanning is sent to the circuit.

By means of inquiring ID information, in a device having only one disk drive, whether the CD-ROM in the disk drive can be used or not can be designated by audio and video output according to the determination result of the ID information. , Provide a message to the user. Further, in an apparatus having a plurality of disc drives, in addition to the function of providing a message to the user by audio output, etc., it has a function of judging the disc of each drive, selecting a disc to be reproduced, and guiding the reproduction. Let

The means for inquiring the ID information is preferably provided for each application software because the number of sets and the data utilization form differ depending on the application software. For example, a lead-in area, which is normally blank, is defined in a data block by a subcode, and means for inquiring ID information is written therein. A means for inquiring ID information is read into the memory and the ID information held in the system controller or the like is determined.

The means for inquiring the ID information may be read into a memory or the like attached to the CPU, and in some cases, necessary correction may be added on the memory according to the application software execution mode.

The application software, which is completed by a plurality of sets, may not only malfunction if the correct data is not read, but may also lose important data. However, the ID information recorded on the CD-ROM is determined in advance. However, if the CD-ROM is not the correct one, the system controller blocks the data reproduction, so that it can be safely used.

[0028]

As described above, in the present invention, the CD-ROM is used.
By using the information in which the unique ID information is recorded in the reproducing apparatus equipped with the means for inquiring the ID information, the general management of the application software completed in a plurality of sets becomes easy.

Since a plurality of sets of CD-ROMs can be managed,
It is possible to expand the occupied capacity of software. Since the disc on the disc drive is judged and the reproduction is performed or the reproduction is stopped, it is possible to prevent an accident such as a malfunction due to reading of illegal data or a loss of the data. I
Depending on the result of the D information judgment, a device with multiple disk drives can automatically select an appropriate disk to read the data, and provide the user of the device with an easy-to-understand instruction for disk replacement, which facilitates the operation. There is an effect such as.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of a data block structure of a CD-ROM of the present invention.

Claims (1)

[Claims] 1. In software completed by a plurality of CD-ROMs, unique ID information for identifying each CD-ROM is recorded in a subcode and a data block in the innermost circumference of the CD-ROM. CD-ROM that does.