KR0166752B1 - Method for improving the response speed of cd-1 player - Google Patents

Abstract

The present invention relates to a method for improving the response speed of a CD-I player. The present invention stores access information for the first data required for each menu or program in the data area of the TOC when a CD-I disc is produced, and reads the information stored in the data area of the TOC of the disc in advance during operation. It provides the effect of improving response speed by playing in real time.

Description

How to improve the response time of CD-I players

1 is a block diagram showing a conventional CD-I player.

2 shows a CD-I disc format defined by the present invention.

3 is a flowchart for explaining a method of playing a CD-I disc having the disc format of FIG.

The present invention relates to a method for improving the response speed of a CD-I player.

In general, CD-I players use full motion video, still images, graphics, high-quality audio, and computer data using a Compact Disc (CD) with Moving Picture Expert Group (MPEG) -I. It is a device for playing the recorded CD-I. Moreover, a CD-I player is an interactive system in which tasks are processed by continuing the question and answer between the user and the device. Thus, the response time for each user's question is important.

It is therefore an object of the present invention to provide a method for improving the response speed of a CD-I player.

A method for improving the response speed of the CD-I player of the present invention for achieving the above object is to produce the CD-I disc, which is the first data required for each menu and program in the data area of the TOC of the disc. A first step of recording the access information, a second step of reading and storing the access information recorded in the first step when the disc is inserted into the player, and reading data necessary for launching the application program and the first screen from the disc. A third step of storing the data; and a fourth step of reading the data designated by the access information in the second step from the disk while performing the data stored in the third step; and an application program read in the third step. Step 5 of re-assigning the access information for the data required in the menu screen according to the execution of the read and save from the disk, When the user selects a menu, and reads the remaining data at the same time that the data corresponding to the selection of the data read from the disc menu in advance a sixth step of continuously play.

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

1 is a block diagram showing a conventional CD-I player.

In the conventional CD-I player, the microprocessor 11 designed using the MC68000 series executes software such as a real-time operating system (CD-RTOS) and an application program of multiple programming using a disk. do. In addition, the microprocessor 11 performs a function of providing a real-time clock required by a de-M-A transmission to an peripheral device, an interrupt controller, and a CD-I player. Stores programs (CD-RTOS, System Booting Program, System Init Program, Device Driver Program, Play Shell Program for user interface,…) that are required for the operation of the CD-I player running on the microprocessor 11 The operating program storage unit 12 is generally composed of EPROM and has a capacity of 512K bytes. Therefore, when the system is turned on, the microprocessor 11 reads and executes a booting program among operating programs stored in the operating program storage unit 12 to boot the system. Thus, each program is registered, and a self program for the interface to the user is executed to enable a dialogue between the user and the system. That is, the user can operate the CD-I player. On the other hand, the data file storage unit 13 stores data files such as CD-I system parameter files, user files, etc. so that an application program and a user can store data or refer to necessary data. Thus, the data file storage unit 13 is composed of NVRAM, which is a nonvolatile memory, so that information can be retained even when the power supply is cut off, and has a capacity of approximately 8K bytes. In addition, the system memory 14, which is used for work when various programs are executed, stores application programs and various information (for example, audio, video, text, and other data) read from the disk. The system memory 14 is managed by the video decoder / system control unit 15 by a multi-program real-time operating system (CD-RTOS) using a disc. And has a capacity of approximately 2M bytes. On the other hand, the interface control unit 16 incorporating the ADPCM decoder 161 and the CD-I decoder 162 stores the CD-I data string read from the disc in the interface control buffer 17, and in the buffer 17. The stored data is decoded through the CD-I decoder 162. In other words, the CD-I decoder 162 reads the CD-I data string temporarily stored in the buffer 17, and performs header, subheader separation, error correction, and the like. The ADPCM decoder 161 and the CD-I decoder 162 in the interface controller 16 may be configured as one chip and may be divided according to respective functions. The interface controller 16 transmits the decoded data to the system memory 14 through the video decoder / system controller 15 according to the request of the microprocessor 11. Here, the interface control buffer 17 is a memory used by the interface control unit 16, is composed of SRAM, and has a capacity of approximately 32 KB. Since the buffer 17 continuously receives the CD-I data stream from the CD drive device 18 in real time, temporary storage, decoding, and transmission are simultaneously performed. That is, it is a buffer that stores a CD-I data stream, a data that is being decoded, and a memory that can store data being transmitted. In addition, the ADPCM decoder 161 is provided as a memory necessary for decoding audio data. In addition, the interface controller 16 has a function for interfacing with the microcomputer 11 and the microcomputer 11 in the CD drive device 18, which is not shown, to exchange commands and statuses. The ADPCM decoder 161 decodes the audio data of the CD-I data sequence temporarily stored in the buffer 17 or receives and decodes the audio data stored in the system memory 14 through the video decoder / system controller 15. do. Here, the ADPCM decoder 161 may perform various audio signal processing such as audio synthesis and audio attenuation. The audio signal decoded by the ADPCM decoder 161 is output through the audio output terminal. Here, signals for DMA transfer of data, the bus interface of the MC68000, chip selection, and the like are provided. This interface control unit 16 performs all control by the microcomputer and the CD-FM (File Management) device driver in the CD drive device 18. The CD drive device 18 has the same function as a conventional CD player. That is, it has a configuration so that data can be read from the disk. It consists of automatic control circuit for pickup, focusing control, tracking control, feeding control, CLV control mounted on the deck, spindle motor drive circuit, tray and tray drive circuit for mounting CD. Receive and operate. The microcomputer controls the CD driver device 18 to read data on the disk, and the command and status are controlled through the microprocessor 11 and the interface controller 16 on the CD-I board. Give and take In other words, when an application program running on the microprocessor 11 requests to read a CD data sector at a specific position on the disk, it is transmitted to the microcomputer in the CD drive device 18 through the CD FM device driver. The microcomputer controls the CD driver device 18 to find the requested position on the disk and read the data. On the other hand, the video decoder / system controller 15 decodes the video signal stored in the system memory 14 and outputs three signals of red (R), green (G), and blue (B) in digital form. The audio signal corresponding to the video signal is decoded and output through the ADPCM decoder 161 in the interface controller 16 as described above. If the video signal stored in the system memory 14 is a signal encoded according to the MPEG-I standard, it is input to the MPEG video decoder 19 through the video decoder / system controller 15. The MPEG video decoder 19 decodes a video signal received through the video decoder / system controller 15 according to the MPEG-I standard to detect red (R), green (G), and blue (B) in digital form. Output three signals. The audio signal corresponding to the video signal is decoded by the MPEG audio decoder 20 and output. Here, the MPEG video decoder 19 and the MPEG audio decoder 20 may be manufactured by one MPEG board, or may be manufactured respectively. The video signal and the audio signal input to the MPEG video decoder 19 and the MPEG audio decoder 20 are once stored in the MPEG buffer 21. The MPEG buffer 21 has a capacity of about 512 KB. The three signals of red (R), green (G), and blue (B) in the decoded digital form are digitally analog-converted by the D / A converter 22 and output. Three signals of red (R), green (G), and blue (B) in the analog form are encoded by the encoder 23 and output in a form that can be displayed on the screen.

When the CD-I player is turned on, several menus are displayed on the screen for the user to select. The user selects and executes a desired menu by using operation keys on the panel of the CD drive device 18, a remote control, or the like. The application program informs the microcomputer of the CD drive unit 18 of the corresponding position to read data from the disk necessary for executing the selection menu. At this point, real-time play begins. The microcomputer of the CD drive device 18 finds the input position on the disk and transfers the corresponding data string to the interface controller 16 on the CD-I board. The interface controller 16 stores the received CD-I data string in the buffer 17 and then decodes the received CD-I data string through the CD-I decoder 162. The decoded data is stored in the corresponding position on the system memory 14 designated by the application program through the video decoder / system controller 15. The stored data are used to provide the user with the necessary data or the corresponding function. Since then, the disc is recorded so that data can be played continuously. In other words, necessary data are continuously arranged to enable real-time play.

As described above, the user feels late because of the time required to search, read, and process the screen, audio, or other data to be displayed to the user for the first time when starting a specific real-time play. Thus, as shown in FIG. 2, the CD-I disc format is newly defined.

2 is a diagram showing a CD-I disc format defined by the present invention.

In FIG. 2, position information (hereinafter, referred to as a play list) about the first data required for each menu or program when a CD-I disc is produced is recorded in a data area of a table of contents (TOC). That is, as shown in FIG. 2 (a), the TOC of the disc is a sync part represented by 12 bytes, a header part represented by 4 bytes, and a subheader represented by 4 bytes. Part, and a data area part having a plurality of play lists (Play List # 1- # n). The play list located in the data area of the TOC has a sequence number (Play List Block NO) indicating the number of play list blocks as shown in FIG. 2 (b), the start address (MIN, SEC, PRAME) of the play list block, and the like. , An end address (EMIN, ESEC, EFRAME), and an area (Control) for recording necessary information (for example, play list start and end marks, sector interleaving, etc.). Here, the application program reads the necessary data in advance by specifying the play list block number. On the other hand, in the initial operation state of the CD-I player, i.e., a new disc is loaded into the CD drive unit 18, the play list blocks recorded in the TOC area of the CD-I disc are read in the system memory ( 14) Store on. Therefore, when the application program starts to operate, the information about the next play, that is, the play list is informed in advance, and the CD drive device 18 reads, decodes and transmits this data in advance. To this end, if the capacity of the buffer 17 is appropriately increased in consideration of the access time of the CD drive device 18, that is, the capacity of the buffer 17 is as follows.

Total capacity = 1 sector of decoding + 1 sector for transmission + 1 sector of input buffer + 2 sectors of ADPCM decoder

+ Memory X sector for storage

= 10KBYTE + αBYTE

The present invention is the same as that of the conventional CD-I player, and has a structure in which the size of the buffer 17 to the system memory 14 is increased by the required size (α bytes). Next, the play operation from the initial state in which the disc is mounted in the CD drive device 18 will be described with reference to FIG.

3 is a flowchart for explaining a method of playing a CD-I disc having the disc format of FIG.

First, the CD drive unit 18 reads a sector containing a play list in the TOC area of the loaded CD-I disc and stores it in the system memory 14 on the CD-I board through a predetermined path (step). One). Then, the data corresponding to the first block (Play List # 0) of the play list, that is, the data required for launching the application program and the first screen, is read from the disk and stored in a buffer for decoding (step 2). When the microprocessor 11 requests data transfer, the sector designated by the play list is read from the CD-I disc while transferring the data stored in the buffer (step 3). The application program respecifies the play list specifying the data required on the menu screen so that the CD drive unit 18 reads and stores the data in advance, and waits for the user's next selection (step 4). When the user selects the next menu, the requested data is transmitted from the already read data, and the remaining data is read out and played in succession (step 5). After this, repeat step 4 and step 5 to read the data required by the application in advance to improve the response speed.

As described above, the method for improving the response speed of the CD-I player of the present invention stores the access information by the first data required for each menu or program in the TOC data area of the CD-I disc, thereby providing the player with the information. When a disc is loaded, the response speed can be improved by reading and playing the data stored in the data area of the TOC of the disc.

Claims (2)

CLAIMS 1. A method for improving the response speed of a CD-I player, comprising: a first step of recording, when a CD-I disc is produced, access information for the first data required for each menu and program in the data area of the TOC of the disc; A second step of reading and storing the access information recorded in the first step when the disc is inserted into the player; A third step of reading and storing data necessary for displaying an application program and a first screen from the disk; A fourth step of reading the data designated by the access information from the disc while performing the data stored in the third step; A fifth step of re-designating access information for data required on a menu screen according to the execution of the application program read in the third step, reading from the disk, and storing the read information; And a sixth step of performing data corresponding to the selection menu among data read in advance when the user selects the menu, and simultaneously reading out the remaining data from the disc and continuously playing the data. Way. 4. The method of claim 3, wherein the access information recorded on the disc in the first step comprises a series of numbers, a start address and an end address, and necessary information. Way.