KR19980054361A - Decoder IC and its data processing method in CD-I player - Google Patents

Abstract

The present invention relates to a decoder IC of a CD-I player which can directly process data input from a CD-I disc in a decoder IC without passing through a central processing unit. The present invention relates to a decoder, a system memory, and an external memory. A decoder IC of a CD-I player having a device, comprising: a decoding unit for decoding data transmitted from a CD-I disk in block units and an audio and video decoding unit for decoding audio and video data among decoded data in block units. And the memory management unit that inputs and outputs data transmitted from the CD-I disk to the system memory under the control of the CPU and the central processing unit, and detects the header and subheader data from the decoded data on a block basis. The control signal is applied to the decoding unit according to the stored reproduction control data to decode block by block. It is configured to include a control device for transmitting the coded data to the audio and video decoding unit or the memory management unit can improve the performance of the system.

Description

Decoder IC and its data processing method in CD-I player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decoder IC, and more particularly, to a decoder of a CD-I player, which allows data input from CD-I (Compact Disc Interactive) directly to be processed in the decoder IC without passing through a central processing unit. It's about I.

In general, a CD-I player is a type of compact disc player that synthesizes and processes data and programs recorded on a CD-I disc as well as external signals such as an OSD (On Screen Display) signal or a graphic signal. It is a device to play through. At this time, the CD-I disk is composed of the first 4 bytes of 1 sector data section, and includes the header and 8 headers that are contiguous with the header so that the address-related information of the entire data can be grasped. It has a data structure consisting of a sub header and original data.

Hereinafter, a decoder IC of a CD-I player according to the related art will be described with reference to the accompanying drawings.

1 is a block diagram showing the configuration of a decoder IC of a CD-I player according to the related art.

At this time, prior to explaining the decoder IC, the CD-I player is a playback control data block 16 (Play) stored in the central processing unit 13, the system memory 15, the decoder IC 10 and an external storage device (not shown). Control Block).

Subsequently, as illustrated in FIG. 1, the decoder IC 10 of the CD-I player according to the related art decodes serial data such as an audio signal or a video signal transmitted from a CD-I disc, and stores a built-in buffer ( A memory management unit (Memory) which inputs and outputs data transmitted from the block decoder 11 to the system memory 15 under the control of the block decoder 11 and the central processing unit 13 which are temporarily stored in a buffer. Management unit) 14 and an audio and video decoding unit 12 for decoding video data and audio data among data transmitted from the block decoder 11.

The operation of the decoder IC 10 configured as described above is as follows.

When serial data such as an audio signal or a video signal is input from the CD-I disk, the block decoder 11 decodes the serial data into blocks of a predetermined size and temporarily stores the serial data in a built-in buffer. Subsequently, the CPU 13 detects, from the data stored in the buffer, a subheader defining data related information such as a header and content defining address information of the data. At the same time, the data after the subheader stored in the buffer is transferred to the audio and video decoding unit 12 or the memory manager 14 according to the structure of the reproduction control data block 16 and instructions corresponding to the contents of the header and the subheader. The control signal is applied to the block decoder 11 to be transmitted. At this time, the reproduction control data block 16 is a data structure which is stored in an external storage device and constitutes a command or the like set for controlling data reproduction. Subsequently, the data transmitted to the memory management unit 14 is stored in the system memory 15 according to the control signal of the central processing unit 13, and the data transmitted to the audio and video decoding unit 12 is appropriately signal-processed so that it can be reproduced. Is played on the TV screen.

The decoder IC of the CD-I player according to the prior art discriminates the data transmitted from the CD-I disc by the central processing unit and transfers the data to a necessary place. Therefore, the central processing unit does not perform any other operation while the data is moving. There is a problem.

Accordingly, the present invention provides a decoder IC of a CD-I player which can identify data transmitted from a CD-I disc and directly transfer it to a required place. There is a purpose.

1 is a block diagram showing the configuration of a decoder IC of a CD-I player according to the prior art;

2 is a block diagram showing the configuration of the decoder IC of the CD-I player according to the present invention.

Explanation of symbols on the main parts of the drawings

10, 20: decoder IC11, 21: block decoder

12: audio and video decoding unit 13: central processing unit

14: memory manager 15: system memory

16: Data block for playback control 22: RISC

The present invention relates to a decoder IC of a CD-I player having a central processing unit, a system memory, and an external memory device, wherein the decoding unit for decoding data transmitted from the CD-I disk in block units and the decoded data in block units. An audio and video decoding unit for decoding audio and video data, and a memory management unit for inputting and outputting data transmitted from a CD-I disk to system memory under control of a central processing unit, and headers and subs in the decoded data in block units. And a control unit for detecting the header data and applying a control signal to the decoding unit according to the reproduction control data stored in the corresponding external storage device to transmit the decoded data in units of blocks to the audio and video decoding unit or the memory management unit. It features.

Hereinafter, a decoder IC of a CD-I player according to the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing the configuration of the decoder IC of the CD-I player according to the present invention.

Prior to explaining the present invention, the basic configuration of a CD-I player is the same as in the prior art.

Next, as shown in FIG. 2, the decoder IC 20 of the CD-I player according to the present invention decodes serial data such as an audio signal or a video signal sequentially transmitted from the CD-I disc in units of blocks of a predetermined size. The memory management unit 14 and the block decoder 21 for inputting and outputting data transmitted from the block decoder 21 to the system memory 15 under the control of the decoded block decoder 21 and the central processing unit 13. The audio and video decoding unit 12 for decoding the video data and the audio data transmitted from the data stream, and the header and subheader are detected in the data being sequentially transmitted to the block decoder 21 and stored in the data control block 16 for reproduction control. The data after the subheader is sent to the audio and video decoding unit 12 or the memory manager 14 according to the command corresponding to the contents of the header and the subheader. It consists of a reduced instruction set computer (RISC) 22 which applies a control signal to the block decoder 21 to be transmitted. At this time, the RISC 22 is a control device for use for a specific purpose, unlike a general purpose CPU (CPU), in the present invention is a control device for controlling only the movement of data. And the block decoder 21 does not have a buffer, unlike the prior art.

Looking at the operation of the decoder IC of the CD-I player of the present invention configured as described above are as follows.

When serial data such as an audio signal or a video signal is sequentially input from the CD-I disc, the block decoder 21 decodes the serial data into block units having a predetermined size. Next, the RISC 22 detects subheaders that define data related information such as headers and contents that define address information of the data in the data sequentially transmitted through the block decoder 21. The RISC 22 transmits the data after the subheader to the audio and video decoding unit 12 or the memory manager 14 according to a command corresponding to the contents of the header and the subheader among the instructions stored in the reproduction control data block 16. The control signal is applied to the block decoder 21 to be transmitted. Subsequently, the data transmitted to the memory management unit 14 is stored in the system memory 15 according to the control signal of the central processing unit 13, and the data transmitted to the audio and video decoding unit 12 is appropriately signal-processed so that it can be reproduced. Is played on the TV screen. At this time, the decoder IC 20 checks the location of the data to be transmitted from the header and the subheader before inputting the original data and delays the original data input after the subheader using the RISC 22 which controls only the movement of the data. Since the block decoder 21 does not need to store the decoded data because it is transmitted in real time without time, the block decoder 21 may be configured without a temporary storage device such as a buffer.

Meanwhile, the CPU 13 may perform other control operations while the decoder IC 20 properly moves data transmitted from the CD-I disc to a signal processing block or the like.

Since the decoder IC of the CD-I player according to the present invention uses a control device for controlling the movement of data transmitted from the CD-I disc, the CPU can perform other control operations while moving the data. This has the effect of improving the performance of the system.

Claims (2)

A decoder IC of a CD-I player having a central processing unit, a system memory and an external storage device; A decoding unit for decoding data transmitted from the CD-I disc in units of blocks; An audio and video decoding unit for decoding audio and video data among the decoded data in units of blocks; A memory manager for inputting / outputting data transmitted from the CD-I disk to the system memory under the control of the CPU; The header and subheader data are detected from the decoded data in block units, and a control signal is applied to the decoding unit according to the reproduction control data stored in the corresponding external storage device without a separate buffer to decode the decoded data in block units. And a control unit for transmitting to the audio and video decoding unit or the memory management unit. In the data processing method of the decoder IC of the CD-I player, Decoding serial data transmitted sequentially from the CD-I disc; Detecting header and subheader data in the decoded data by an embedded controller; And transmitting data input subsequent to the subheader data to a place according to a control signal of the control device in real time without delay.