KR100206441B1 - The decoding and its method of a compressed data in cd-rom - Google Patents

Abstract

The present invention relates to a method and a device for decompressing CD-ROM data, comprising: a CD-ROM as a read-only storage device for recording code information on a storage medium having a diameter such as an audio compact disc; A controller which controls the cdrom and reads data; A memory in which system software and user software are loaded and executed or receive and store data output from the CD-ROM; A central processing unit responsible for arithmetic, processing, etc. of contents of the memory or information input from an external input device; A video controller receiving the decoded data from the CD-ROM controller and outputting the decoded data to the following monitor through an internal D / A converter; A monitor which is a device for receiving an image data from the video controller and displaying an image so as to be visually confirmed; Since the present invention occupies only a small portion of the bandwidth of the PCI bus, the resource of the PCI is transmitted to the video controller without using a large amount of resources. Thus, the central processing unit can perform other tasks, which greatly affects system performance. The present invention relates to a method and apparatus for decompressing CD-ROM data that utilizes a multimedia function.

Description

Device and method for decompressing cdrom data

1 is a block diagram of a conventional apparatus for decompressing CD-ROM data,

2 is a block diagram of a device of CD-ROM data according to an embodiment of the present invention,

3 is a flowchart illustrating decompression of CD-ROM data according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

100: cd-rom 110: cd-rom controller

111: Controller Logic 117: Decryptor

120: video controller 130: feature connector

140: monitor 150: central processing unit

160: memory

The present invention relates to a method and apparatus for decompressing CD-ROM data, and more specifically, to fix a CD-ROM controller having a decompression circuit external to the CD-ROM controller and to decode the CD-ROM controller and output the same directly to the VGA controller. In doing so, the central processing unit relates to a method and apparatus for decompressing CD-ROM data which enables processing of other tasks.

Hereinafter, a conventional CD-ROM decompression will be described with reference to the accompanying drawings.

1 is a block diagram of a conventional apparatus for decompressing CD-ROM data.

As shown in FIG. 1, the conventional CD-ROM data decompressor has a CD-ROM 50, which is a read-only storage device that records code information on a storage medium having the same diameter as an audio compact disc. and; A controller 40 that controls the CD-ROM 50 and reads data; A memory 30 which is loaded with the system software and the user software, or receives and stores data output from the CD-ROM 50; A central processing unit (20) which is responsible for the operation, processing, etc. of the contents of the memory (30) or information input from an external input device; A decoder 60 for receiving data from the memory 30 and decoding and outputting compressed video data; A video controller 70 receiving the decoded data from the decoder 60 and outputting the decoded data to the monitor 80 through an internal D / A converter (not shown); Receives the image data from the video controller 70 is composed of a monitor (80) which is a device for displaying an image so that the eye can see.

The controller 40 controls the CD-ROM 50 to read data from the CD-ROM and output it to the outside, and the data is accumulated in the memory 30 through a bus.

The data stored in the memory 30 is not decompressed, and the central processing unit 20 transmits the decoded data to the decoder 60 to decompress the compressed data.

After the decompressor is decompressed again, the data is input to the video controller 70, which is processed inside the video controller 70 for display on the monitor 80, whereby the final D / A converter It has a path that is output to the monitor 80 (not shown).

However, the above-described prior art uses a lot of memory inside the computer system, and reduces the overall computer system speed and multitasking effect.

Accordingly, an object of the present invention is to solve the above-mentioned conventional problems, and to solve the above problems, without using a decoder inside the computer system and directly decompressing the decoder by including the decoder inside the CD-ROM controller. The present invention provides a device and a method for decompressing CD-ROM data for enhancing the speed and multitasking of a computer system.

As a means for achieving the above object, a configuration of the present invention includes: a CD-ROM for recording code information on a storage medium; And a decoder for decoding the compressed data recorded in the CD-ROM, and receiving the data recorded in the CD-ROM outputted by the first signal to determine whether the compressed data is compressed data, and compressing the compressed data according to the determination result. A CD-ROM controller, which is a control device that reads or passes and outputs to the following monitor without passing through the system bus; A memory in which system software and user software are loaded and executed; It is in charge of operation and processing of contents of the memory or information input from an external input device, and outputs the first signal which is a control signal to the CD-ROM so that recorded data is input to the CD-ROM controller. A central processing unit; A video controller which receives uncompressed data from the CD-ROM controller and outputs the uncompressed data to the following monitor through an internal D / A converter; And decompressing the CD-ROM data, wherein the monitor is a device which displays an image so as to receive the image data from the video controller.

A CD-ROM which is a read-only storage device that records code information on a storage medium having a diameter such as an audio compact disc; A controller which controls the cdrom and reads data; A memory in which system software and user software are loaded and executed or receive and store data output from the CD-ROM; A central processing unit responsible for arithmetic, processing, etc. of contents of the memory or information input from an external input device; A video controller receiving the decoded data from the CD-ROM controller and outputting the decoded data to the following monitor through an internal D / A converter; It is composed of a monitor that receives the image data from the video controller and displays the image so that it can be visually confirmed.

The CD-ROM controller includes a demultiplexer (DEMULTIPLEXER), which is a circuit for selecting one of a plurality of output paths and connecting the input path according to a control signal; A multiplexer (MULTIPLEXER) for sequentially selecting a plurality of input signals, dividing the signals, and outputting a signal corresponding to each input as one output each time; A decoder which receives the data output from the CD-ROM and decodes and compresses the compressed image data; A feature connector for directly connecting the decompressed digital feature data through the decoder to a video controller without using an internal bus of a computer system; A buffer used for preventing the high-speed internal processing unit from going to a standby state due to a slow operation of the input / output device, and a buffer used to remove the influence from the front end of the circuit; It consists of control logic that controls the connection and signal transmission of the device or circuit, etc. and grasps the overall signal state and outputs a control signal.

Another aspect of the present invention for achieving the above object comprises the steps of: a central processing unit for applying an operation command to a multimedia set including a CD-ROM driver; Initializing the video controller and designating an area in which data of the CD-ROM is displayed on the monitor; Initializing the CD-ROM driver; Selecting whether the data movement path of the CD-ROM is a system bus or a feature connector; If the system bus is selected, initializing the target address of the video controller to the CD-ROM controller; If the feature connector is selected, connecting a movement path of data to the selected path; The operation signal is applied to the CD-ROM controller and the internal control logic.

With the above configuration, the most preferred embodiment which can be easily implemented by those skilled in the art to which the present invention pertains will be described in detail with reference to the accompanying drawings.

2 is an apparatus for decompressing CD-ROM data according to an embodiment of the present invention, and FIG. 3 is an operation flowchart of decompression of CD-ROM data according to an embodiment of the present invention.

As shown in FIG. 2, the apparatus for decompressing CD-ROM data according to an embodiment of the present invention is a device for reading-only storage by recording code information on a storage medium having the same diameter as an audio compact disc. ROM 100; A CD-ROM controller 110 which controls the CD-ROM 100 and reads data; A memory 160 in which system software and user software are loaded and executed or receive and store data output from the CD-ROM 100; A central processing unit 150 in charge of arithmetic, processing, etc. of the contents of the memory 160 or information input from an external input device; A video controller (120) for receiving the decoded data from the CD-ROM controller (110) and outputting the decoded data to a monitor (140) through an internal D / A converter (not shown); Receives the image data from the video controller 120 is composed of a monitor 140 that is an apparatus for displaying an image so that the eye can see.

The CD-ROM controller 110 includes a demux (DEMULTIPLEXER) 113 and 118, which is a circuit for selecting one of a plurality of output paths and connecting the input path according to a control signal; MULTIPLEXER 116 for sequentially selecting a plurality of input signals, dividing the signals, and outputting a signal corresponding to each input as one output each time; A decoder 112 which receives data output from the CD-ROM 100 and decodes and outputs compressed image data; A feature connector 130 that connects the decompressed digital feature data through the decoder 112 directly to the video controller 120 without using an internal bus of the computer system; Buffers 112 and 114 used for preventing the high-speed internal processing unit from going to the standby state due to the slow operation of the input / output device, and for removing the influence from the front end of the circuit; Control logic 111 for controlling the connection and signal transmission of the device or circuit, etc. and grasping the overall signal state to output a control signal.

As shown in FIG. 3, the configuration of the operation flowchart of the apparatus for decompressing CD-ROM data according to the embodiment of the present invention indicates that the central processing unit 150 operates commands to a multimedia set including a CD-ROM driver. Applying a step (F20); Initializing the video controller 120 and designating an area in which data of the CD-ROM 100 is displayed on the monitor 140 (F30); Initializing the CD-ROM driver (F40); Selecting whether the data movement path of the CD-ROM 100 is the PCI bus or the feature connector 130 (F50); If the PCI bus is selected, initializing the target address of the video controller 120 to the CD-ROM controller 110 (F60); If the feature connector 130 is selected, connecting the movement path of the data to the selected path (F70); In step F80, an operation signal is applied to the CD-ROM controller 110 and the control logic 111 therein.

With the above configuration, the operation according to the embodiment of the present invention is as follows.

The central processing unit 150 is given an operation command to the multimedia function, and initializes the video controller 120 and designates regions to be displayed by the CD-ROM (F20 and F30).

Thereafter, the central processing unit 150 initializes the CD-ROM driver, and the CD-ROM controller 110 reads data from the CD-ROM 100 (F40).

The compressed data read from the CD-ROM 100 is input to the control logic 111, the demux 118, and the buffer 112 in the CD-ROM controller 110.

The data input to the buffer 112 is transmitted to the memory 160 through the PCI bus, processed, and then transmitted to the required device according to the data to be output (F50).

Meanwhile, the control logic 111 receives the input data of the CD-ROM 1100 and determines whether the data of the CD-ROM 1100 is compressed data or uncompressed data. If the determined data is compressed data, the control logic 111 outputs a control signal to the demux 118 to output the data of the CD-ROM 1100 to which the demux 118 is input to the decoder 117. If the determined data is uncompressed data, another control signal is output to the demux 118 to output data of the CD-ROM 1100 to which the demux 118 is input to the mux 116.

At this time, the demux 118 receives the data of the CD-ROM 1100 by the central processing unit 150.

The compressed data input to the decoder 112 is decompressed by the DECODING action of the decoder 112 and input to the mux 116.

The data input to the mux 116 receives a control command of the control logic 111 and is output to the buffer 114 (F60, F70, F80).

The buffer 114 which does not disturb the previous circuit or has a buffering effect on the delay of data by the internal device is input to the demux 113 while continuing to load the data output from the mux 116. Data may be transmitted on the PCI bus, and image data may be transmitted to the feature connector 130 connected to the video controller 120 instead of directly through the PCI bus.

The data transmitted to the video controller 120 is mixed with the operation of the video controller 120 to output data to the monitor 140.

As described above, in the embodiment of the present invention, the bandwidth of the BAND WIDTH of the PCI bus is about 133 MBYTE / S, and the multimedia data is 24 frames per second (FRAME) at 24BIT color with a resolution of about 640 * 480. Transmitted or through a feature connector, occupying approximately 17% of the bandwidth of the PCI bus, so the PCI's RESOURCE is sent to the video controller without much use, so the central processing unit can do anything else. It is possible to provide a method and apparatus for decompressing CD-ROM data having an effect that does not significantly affect system performance.

This effect of the present invention can be used for multimedia distribution of a computer.

Claims (3)

A CD-ROM for recording code information on a storage medium; And a decoder for decoding the compressed data recorded in the CD-ROM, and receiving the data recorded in the CD-ROM outputted by the first signal to determine whether the compressed data is compressed data, and compressing the compressed data according to the determination result. A CD-ROM controller, which is a control device that reads or passes and outputs to the following monitor without passing through the system bus; A memory in which system software and user software are loaded and executed; It is in charge of operation and processing of contents of the memory or information input from an external input device, and outputs the first signal which is a control signal to the CD-ROM so that recorded data is input to the CD-ROM controller. A central processing unit; A video controller receiving uncompressed data output from the CD-ROM controller and outputting the uncompressed data to the following monitor through an internal D / A converter; And decompressing the CD-ROM data, wherein the monitor is a device which displays an image so as to receive the image data from the video controller. The CD-ROM controller of claim 1, further comprising: a control logic for determining whether data of the CD-ROM is compressed and outputting a control signal corresponding to the determination result; A first demux (DEMULTIPLEXER) which selects one of a plurality of output paths and outputs data input from the CD-ROM according to a control signal of the control logic; A decoder for decoding and outputting compressed data input from the first demux according to a control signal of the control logic that determines that the data of the CD-ROM is compressed data; A mux for sequentially selecting an input signal from the decoder or the first demux, dividing the signal, and outputting a signal corresponding to each input as one output each time; A buffer for preventing the high speed internal processing unit from becoming idle due to a slow operation of the input / output device and for removing the influence from the front end of the circuit, the buffer receiving the output of the mux; A second demux receiving the output of the buffer and outputting the buffer in response to a control signal of the central processing unit; A feature connector for directly connecting the digital feature data output from the second demux to the video controller without using an internal bus of the computer system; And decompressing the CD-ROM data, the second buffer having the same function as the first buffer and positioned between the central processing unit and the CD-ROM. The central processing unit issuing an operation command to a multimedia set including a CD-ROM driver or the like; Initializing the video controller and designating an area in which data of the CD-ROM is displayed on the monitor; Initializing the CD-ROM driver; Selecting whether the data movement path of the CD-ROM is a system bus or a feature connector; If the PCM bus is selected, initializing the target address of the video controller to the CD-ROM controller; If the feature connector is selected, connecting a movement path of data to the selected path; A method of decompressing CD-ROM data, comprising: applying an operation signal to a CD-ROM controller and internal control logic.