JPH08138317A - Simulator for information recording medium - Google Patents

Abstract

PURPOSE: To obtain a simulator for information recording medium in which the data can be certified immediately after debugging work by a constitution wherein the data is read out in a manner just similar to that for an information recording medium and certified. CONSTITUTION: Upon receiving a data read-out instruction externally, an instruction processing section 2 delivers the data read-out instruction and the read-out starting position for the designated data, as a time data, to a CPU 3 while at the same time a timer is started at a data delay section 5. The CPU 3 determines the position of data tile stored in a data memory section 4 and designated by the time data at the data read-out starting position with reference too a correspondence table. Data is then outputted sequentially to the data delay section 5 from the tile recorded at a relevant position. In this regard, the time to be elapsed before starting output of data is shortened as much as possible so that the final data can be outputted smoothly after format conversion even if the file read-out starting position is shifted in succession at the data memory section 4 resulting in a long access time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simulation device for confirming data recorded on an information recording medium before recording on the information recording medium, and more particularly to a compact disc (C
D) The data can be debugged easily at the time of creating the data of the CD-ROM which records the data in C.
The present invention relates to a D-ROM simulation device.

[0002]

2. Description of the Related Art Conventionally, there is an information recording medium called CD-ROM in which data such as computer software and game software is recorded on a compact disc (CD) for music. Since a large amount of this CD-ROM is produced using a stamper, debugging data addition, correction, replacement, etc. is performed while confirming the data to be recorded before producing the master disc, to make it completely correct data. It is necessary to produce a master disc after that.

Further, in consideration of the case of recording data such as images and sounds to be reproduced in real time or other data related to the access time to the CD-ROM, the confirmation of the data to be recorded is recorded in the CD-ROM. It was necessary to perform it with a simulation device that reproduces in the same manner as in the above state. Under such circumstances, a simulation device as disclosed in Japanese Patent Laid-Open No. 3-46182 is disclosed.

This conventional simulation apparatus is shown in FIG. 3 and briefly described below. As shown in the figure, this simulation device is a high-level device 1 such as a computer.
1, a voice monitor unit 12, and a lower device 14 having a data reading unit 14 and an edited data storage unit 15. Then, the data to be recorded on the CD-ROM is recorded in the edited data storage means 15 of the lower device 14 in the data format to be recorded on the CD-ROM, and the data designated by the read command of the upper device 11 is read. The means 14 reads out from the edited data storage means 15, delays by the access time, and then outputs to the voice monitor means 12. By doing so, the data can be read and confirmed in exactly the same way as the actual reading from the CD-ROM.

[0005]

Since the above-mentioned conventional simulation apparatus records data in the data format to be recorded in the CD-ROM, when debugging a work such as adding, correcting, or deleting a part of the data. In addition, after performing debugging with the data in the state before being converted to the data format to be recorded in the CD-ROM, all the data is converted to the data format to be recorded in the CD-ROM again, and the edited data storage means It was necessary to record in 15, and even if some changes were made, all the data had to be converted and recorded, which took time.

Particularly, in converting data into a data format for recording on a CD-ROM (premastering), a recently developed high-speed CPU (central processing unit)
However, it takes as long as 60 minutes to convert 60 minutes of data, and the data creator has to wait for that time each time the debugging work is performed. Therefore, it is an object of the present invention to provide an information recording medium simulation apparatus capable of confirming data immediately after debugging the data.

[0007]

As means for achieving the above object, data to be recorded on an information recording medium can be divided into a plurality of files and stored, and can be read out at a higher speed than the information recording medium. A data storage unit, a command processing unit that outputs a read command for reading specific data stored in the data storage unit, and the specific data specified by the read command supplied from the command processing unit as the information storage unit. An arithmetic unit that calculates a data access time when outputting from the medium as a delay time, and delays the specific data supplied from the data storage unit by a time obtained from the delay time supplied from the arithmetic unit. The data delay section to output and the specific data supplied from the data delay section are converted into a data format read from the information storage medium and output. And a data conversion section for, is intended to provide a simulation device of an information recording medium and outputs the specific data data access time period delays of the information storage medium.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the information recording medium simulation apparatus of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a CD-ROM simulation apparatus which is an embodiment of the information recording medium simulation apparatus of the present invention. As shown in the figure, this simulation device
An instruction processing unit 2 for interpreting an instruction such as a data read instruction supplied from the outside and transmitting the contents to the CPU 3 as necessary, and data to be recorded in a CD-ROM are divided into a plurality of files and stored, and each of them is stored. Delete each file at high speed
For example, a hard disk (H
A CPU which controls the data storage unit 4 such as D) and the entire device and calculates the data access time when reading from the CD-ROM as a delay time in order to delay the data output designated by the read command. (Calculator) 3
A data delay unit 5 which delays the data supplied from the data storage unit 4 by a time calculated from the delay time supplied from the CPU 3 and outputs the data, and a data supplied from the data delay unit 5 to a CD-ROM. Drive is CD-RO
The personal computer (PC) 1 includes a data conversion unit 6 that converts the data into a serial data format that is the same as the data format that is read from M and outputs the data to the data decoding unit. Then, the instruction processing unit 2, CP
The U3, the data storage unit 4, and the data delay unit 5 are connected to each other by a PC bus.

Here, the operation of this simulation apparatus will be described with reference to the flow chart shown in FIG.
First, when a data read command is supplied from the outside (step 21 → Yes), the command processing section 2 outputs the read start position of the data designated by the data read command to the CPU 3 as time data (step 22). , Start the timer of the data delay unit 5 (step 2
3).

The CPU 3 calculates, based on a correspondence table, which position of the data stored in the data storage unit 4 the time data at the data read start position is calculated based on the correspondence table. The data of the recorded files are sequentially output to the data delay unit 5 (step 2
4). At this time, the time until the start of data output is shortened as much as possible, and even if the read start position of the file in the data storage unit 4 moves one after another and the access takes time, the final data after the format conversion is converted. Do not disturb the output. And at the same time, this data
When reading from the D-ROM, the access time required for the CD-ROM drive to read from the CD-ROM is C
It is calculated by PU3 and output to the data delay unit 5 (step 26).

In the data delay unit 5, the timer is stopped when the data is input (step 25), and the supplied data is calculated as the delay time T _{DL represented} by the following equation (a) (step 27). , _Is delayed by the delay time T _DL and output to the data conversion unit 6 (step 28).

T _DL = T _SEEK −T _CURR −T _FORM (Equation (a)) T _DL : Delay time delayed by the data delay unit 5 T _SEEK : Data access time calculated by the CPU 3 T _CURR : After the timer starts Time until data is input T _FORM : Time until data is converted by the data conversion unit 6 and output

Then, in the data converter 6, the supplied data includes a synchronization signal (SYNC), a header, a sub-header,
Converted to a serial data format of CD-ROM with ECC, EDC, etc. and output (step 2
9). The data output from the simulation device is delayed by the data delay unit 5 by (data access time calculated by the CPU 3)-(time from the supply of the data read command to the output from the data conversion unit 6). As a result, the data is output after being delayed by the data access time when reading from the CD-ROM. Therefore, the data is read and confirmed in exactly the same manner as when reading from the CD-ROM. can do.

Strictly speaking, the access time of the hard disk used in the data storage unit 4, the transfer time of the PC bus, etc. are always fluctuating, but in the present embodiment, the data delay unit 5 close to the output side. In the above, since it is processed as the time from the start of the timer until the data is input to the data delay unit 5, even if these times change, the delay time of the finally output data is not affected. Therefore, it can be output with high accuracy (the delay amount by the data conversion unit 6 in the subsequent stage is constant).

When the debug operation is performed, it is possible to partially modify each file, so that it is not necessary to change the entire file, and it is possible to check in file units. Further, since the data is recorded in the data storage unit 4 in a state before being converted into the serial data format of the CD-ROM, the data can be immediately confirmed without waiting for a long time for the whole conversion after the debugging work. It can be performed.

[0016]

Since the information recording medium simulation apparatus of the present invention can read and confirm data in exactly the same manner as reading from the information recording medium, it can be used in a CD-ROM or the like. Before making a master disc, you can check data and debug. Further, when performing the debugging work, since it is possible to partially modify each file, it is not necessary to change the whole file, and it is possible to check in file units. In addition, since the data is recorded in the data storage unit before it is converted to the data format of the information recording medium, it is possible to confirm the data immediately after debugging without waiting for a long time for the entire conversion. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an information recording medium simulation apparatus of the present invention.

FIG. 2 is a flow chart diagram for explaining the operation of an embodiment of the information recording medium simulation apparatus of the present invention.

FIG. 3 is a configuration diagram showing a conventional example.

[Explanation of Codes] 1 personal computer (PC) 2 instruction processing unit 3 CPU (arithmetic unit) 4 data storage unit 5 data delay unit 6 data conversion unit

Claims (1)

[Claims] 1. A data storage unit capable of dividing data to be recorded on an information recording medium into a plurality of files for storage and reading the data at a higher speed than the information recording medium, and the data storage unit. A command processing unit that outputs a read command for specific data, and a data access time when the specific data designated by the read command supplied from the command processing unit is output from the information storage medium are calculated as a delay time. And a data delay unit that delays and outputs the specific data supplied from the data storage unit by a time obtained from the delay time supplied from the calculation unit, and is supplied from the data delay unit. A data conversion unit for converting the specific data to a data format read from the information storage medium and outputting the data format. Simulation apparatus of the information recording medium, characterized in that data access time period is delayed to output the specific data.