KR0144973B1 - Method and apparatus for power control in compact disk graphics system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power automatic control apparatus and method for determining the type of disc in a CDG system and controlling the supply and interruption of power according to the type of disc. The present invention relates to a subcode data by signal processing of data read from the disc. From the digital signal processor to output, the CDG processor to perform graphics processing on the subcode data output from the digital signal processor, and the mode data of the subcode output from the CDG processor, the disc mode is judged. A judgment control unit for outputting a power supply control signal and outputting a power supply control signal for instructing a power off when the graphics mode is not in use, and supplying or cutting off power to the CDG processing unit by controlling the power supply control signal output from the determination controller. Provides power by classifying disc types including power supply controller. By supplying and cutting off power, it is possible to prevent unnecessary power consumption and increase the power usage efficiency of the CDG player.

Description

Power automatic control device and method for compact disc graphic system

1 shows the data format of a subcode.

2 is a block diagram according to an embodiment of an automatic power supply control apparatus of a compact disc graphics player.

3A and 3B are waveform diagrams of synchronization signals for distinguishing subcodes.

4A to 4C are waveform diagrams of data synchronization signals and data during one period of the synchronization signal shown in FIG. 3B.

5 is a flowchart showing a method for automatically controlling power of a compact disc graphics system according to the present invention.

* Explanation of symbols for the main parts of the drawings

202: digital signal processing unit 203: microcomputer

204: CDG processing unit 205: power supply control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic control apparatus and method for power supply in a compact disc graphics system. More particularly, the present invention relates to an automatic power control apparatus and method for determining the type of disk and controlling the supply and interruption of power according to the type of disk. will be.

In general, the compact disc method includes a compact disk (recorded as CD) for recording audio information and a compact disk graphic (hereinafter referred to as CDG), which mainly records audio information but records video information (still image). Etc.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CDG capable of reading audio information recorded on a disc and graphic information recorded in a subcode area attached to each frame for recording audio information and displaying the same on a television. This CDG is a system that can read graphic information together with sound information contained on a disc and display it on a TV. It is possible to send out music scores or related images. By using this function, various educational programs as well as the existing music field can be used. It can be used to record.

Most compact disc graphics players (CDGP) can drive both CD, which is an audio-only disc, and CDG, which is a disc with graphics information. Therefore, CDGP always supplies power to the CDG processing unit regardless of whether the disc is a CD or a CDG. If the disc is not a CDG but a CD, power is supplied to the CDG processing unit. This consumes unnecessary power. In particular, when driving a CD in a battery-powered portable CDGP consumes unnecessary power, there was a problem that the use time is reduced.

Accordingly, an object of the present invention is to provide a power automatic control apparatus for controlling the supply and interruption of the power supply of a compact disc graphics system according to the type of disc by distinguishing whether the disc is a CD or a CDG in a CDGP.

Another object of the present invention is to provide a method for driving an automatic power supply control device for controlling the supply and interruption of power in the CDGP.

In order to achieve the above object, in the compact disc graphics (CDG) player according to the present invention, there is provided a digital signal processing unit for signal processing data read from a disc and outputting subcode data, and the subcode data output from the digital signal processing unit. And a CDG processing unit for performing graphics processing, and determining the mode of the disc from the mode data of the subcode outputted from the CDG processing unit, and outputting a power supply control signal for commanding power supply if the mode is the graphic mode, and if not, the power supply. And a power supply control unit for supplying or cutting off the power of the CDG processing unit by the control of the power supply control signal output from the determination control unit.

A method for controlling a power supply in a compact disc graphics player (CDGP) for achieving the above another object, the method comprising: a first judging process for determining whether a playback command is input when the system is in a stopped state and the first judging process; When the play command is input in the stop state at, the power supply process for supplying the power of the CDGP and the power supply during the power supply process operate with the CDG processor to determine the mode of the disc based on the subcode data read from the disc. In the second determination process and the second determination process, if the mode of the disc is not in the graphics mode, it comprises a power off process of shutting off the power of the CDG processing unit.

Before describing the present invention, the data format of the CDG will be described with reference to FIG. 1 to aid the understanding of the present invention.

In the CDG, an area in which signals called subcodes are recorded is set for each frame for recording audio information. This subcode consists of eight subcode bits and each collection of bits constitutes eight channels represented by P, Q, R, S, T, U, V, and W, respectively. In the CDG, the P and Q channels usually contain information for finding the progress of each song, such as the absolute time of the disc, the relative time of each song, the track number, and the starting point of the song. Six channels from R to W record graphic information. A group of six bits from the R channel to the W channel is called a symbol (SYMBOL), and 98 symbols are collected to form one block. The first two of the 98 symbols are used as the synchronization signals S0 and S1 and constitute one pack as 24 symbols. In addition, four packets constitute one packet (PACKET).

Twenty-four symbols constituting each pack will be described by referring to symbol- 0 to symbol-23.

Symbol-0 represents a combination of MODE-ITEM with three bits, called MODE, and three bits, called Item, which specifies the graphics usage. The symbol-1 following the symbol-0 is called an instruction and indicates the type of data field, that is, the form of the instruction. Symbol-2 and Symbol-3 consecutive to Symbol-1 are the error correction codes for Symbol-0 through Symbol-3. Symbol-4 to Symbol-19 after Symbol-3 are data fields, and Symbol-20 to Symbol-23 are error correction codes for protecting the pack information.

The following MODE-ITEM combination is shown in Table 1.

As shown in Table 1, the zero mode indicates that there is no graphic information. Line-graphics mode is a mode for simple graphics and TV-graphics mode is a mode for higher resolution graphics.

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

2 is a block diagram of a compact disc graphics player.

2 shows a digital signal processor 202 for outputting subcode data among data stored on the disk 201, and a CDG processor for connecting an input terminal to the synchronous signal output terminal and the subcode data output terminal of the digital signal processor 202. 204 and a microcomputer 203 which connects input terminals to the mode output terminal and the mode-in signal output terminal of the CDG processing unit 204, and inputs an external input signal according to the PLAY and STOP keys; A power supply control unit 205 for connecting an input terminal to a power supply control signal output terminal and an output terminal for a power input terminal of the CDG processing unit 204, and a display unit 206 for connecting an input terminal to a data output terminal of the CDG processing unit 204. Is done.

5 is a flowchart according to the present invention, which includes a first determination process (steps 501-503), a power supply process (steps 504), a second determination process (steps 505-507), and a power cutoff process (step Step 508).

Next, the operation of the present embodiment will be described with reference to FIGS. 2 to 5.

When the system of the compact disc graphics player is operated, initialization is performed (step 501). The power supply of the CDG processing unit 204 is made when a playback command is input in the stopped state. Therefore, the microcomputer 203 determines the input of the play key (step 502), and when the play key is input, the microcomputer 203 determines the stop flag to determine whether the current state is the play state or the stop state. The determination process is performed (step 503).

If the stop flag is not set (1), that is, clear (0), the playback state is indicated and the playback state is maintained and the instruction is waited again.

If the stop flag is set (1), since the stop flag is in the stopped state, a power supply process is performed (step 504).

The transistor circuit of the power supply control unit 205 is an emitter follower. When the input signal is high, the power connected to the collector is output. If the input signal is low, the power connected to the collector is supplied. No output

The microcomputer 203 which judges that a regeneration command is input in the stop state outputs a power control signal to the base of the transistor, which is the power supply control unit 205, at a high level, and at this time, the power control supply unit 205 supplies the CDG processing unit. Supply power to 204. In addition, the stop flag is cleared (0) to indicate that the playback state.

When power is supplied to the CDG processing unit 204, the CDG processing unit 204 receives a synchronization signal generated from the digital signal processing unit 202 shown in Figs. 3A and 3B as an input. FIG. 3A is a signal for distinguishing a block having one packet and two synchronization signals S0 and S1, and shows synchronization signals S0 and S1 for one period. FIG. 3b is a signal for distinguishing the symbols SYMBOL. Since two synchronization signals and 96 symbols SYMBOL are included in one block, 98 synchronization signals are given in one cycle of FIG.

When the synchronization signals of FIGS. 3A and 3B are input to the CDG processing unit 204, the CDG processing unit 204 outputs a synchronization signal (FIG. 4B) for obtaining subcode data to the digital signal processing unit 202, and digitally. The signal processing unit 202 outputs the subcode data (Fig. 4C).

FIG. 4a shows one period of a synchronization signal for distinguishing one symbol SYMBOL, and FIG. 4b shows eight synchronization signals for reading eight subcodes per symbol SYMBOL, and FIG. 4c shows in FIG. 4b. This is a waveform diagram of subcode data outputted from the digital signal processing unit 202 to the CDG processing unit 204 in synchronization.

The microcomputer 203 determines data from the CDG processing unit 204 in order to determine whether the data of the disk read by the digital signal processing unit 202 is actually data having a mode for the CDG processing unit 204 to operate. Get input. At this time, the microcomputer 203 receives the mode-in signal MODE-IN, which is a signal for controlling the storage of the mode discrimination data MODE output by the CDG processing unit 204, together with the mode discrimination data MODE. That is, the microcomputer 203 determines whether the mode-in signal is input (step 505), and when the mode-in signal is input, the mode received from the CDG processing unit 204. The determination data MODE is stored (step 506).

The microcomputer 203 determines the mode of the stored data as shown in Table-1 (step 507). If the mode is the graphics mode, the CDG processing unit 204 that has already been supplied powers the data. In order to cut off the power of the CDG board 204 when not in the graphics mode, the microcomputer 203 outputs a power control signal low. Since the transistor receiving the low input to the base stage does not output the power connected to the collector, the power of the CDG processing unit 204 is cut off (step 508).

If the PLAY key is not input in step 502, it is determined that the STOP key is input (step 509). If the STOP key is input, the stop flag is set (1) to indicate that it is in the stopped state. .

As described above, the automatic power supply control apparatus and method of the compact disc graphic system according to the present invention distinguish whether the disc is a CD or a CDG by sub-codes, and if the disc is a CD, cut off the power of the CDG board, thereby eliminating unnecessary power. There is an advantage to increase the power usage efficiency of the CDG player by preventing consumption.

Claims (3)

A compact disc graphics (CDG) player, comprising: a digital signal processor for signal processing data read from a disc and outputting subcode data; A CDG processor for graphicly processing the sub code data output from the digital signal processor; The mode of the disc is determined from the mode data of the subcode output from the CDG processing unit, and if the mode is the graphic mode, a power supply control signal for commanding power supply is output; A determination control unit outputting a; And a power supply control unit for supplying or cutting off the power of the CDG processing unit by the control of the power supply control signal output from the determination control unit. The power supply control unit of claim 1, wherein the base terminal is connected to an input resistor (R1) connected to the power supply control signal output terminal of the determination control unit, and the collector terminal is connected to a collector resistor (R2) connected to the supply power supply terminal. And an emitter stage comprising a transistor (TR1) connected to an output resistor (R3) connected to ground to output the power supply to the CDG processing unit. CLAIMS 1. A method for controlling power in a compact disc graphics player (CDGP), the method comprising: a first judging step of determining whether a play command is input when the system is in a stopped state; A power supply process of supplying power of a CDGP when a play command is input while in a stop state in the first determination process; A second judging step of supplying power in the power supply process to determine the mode of the disc based on the subcode data read from the disc by the CDG processor; And a power off process of shutting off the power of the CDG processing unit if the mode of the disc is not the graphic mode in the second determination process.