KR19980021850A - Fast Access Method of Optical Disc Player - Google Patents

Abstract

The present invention relates to a fast access method of an optical disc reproducing apparatus which allows a user to select a menu screen and access a menu at VCD 2.0 to find a target point faster by accessing twice the speed.

To this end, the present invention comprises the first step of receiving an input for the target point search from the key input unit of the optical disc playback device to search whether the target point is inner or outer periphery; A second step of calculating the number of tracks to be searched according to the recognition of the inner / outer periphery of the target point of the first step; A third step of calculating the number of tracks to be accessed quickly = the number of tracks to be searched-the preset number of adjacent tracks using the number of tracks to be searched calculated in the second step; A fourth step of performing fast access to the track to be accessed calculated in the second step by n-folding the address book slide gain by n-fold the search speed (n = 2, 3, ...); The remaining tracks up to the number of tracks to be searched are multiplied by a slide gain of 1 to perform constant speed access, and thus, there are five steps.

Description

Fast Access Method of Optical Disc Player

The present invention relates to a fast access method of an optical disc reproducing apparatus. In particular, when a user selects a menu by viewing a menu screen in VCD 2.0, the user accesses twice the speed and finds a target point more quickly. A fast access method of an optical disc reproducing apparatus.

In the conventional optical disc reproducing apparatus, as shown in FIG. 1, a high frequency amplifying unit 1 converts an optical signal of information recorded on a disc into an electrical signal and amplifies it to a predetermined level, and outputs from the high frequency amplifying unit 1. The DSP unit 2 is provided with a servo circuit for driving the optical disc for decoding the harmonic signal and correcting the error of the disc, and the overall data of the optical disc through the data communication output from the DSP unit 2. The microcomputer 3 for controlling the operation, the key input unit 4 for inputting a function key, and the microcomputer 3 detects a key signal and applies it to the DSP unit 2, Motor drive unit 5 for transmitting data according to the control signal output from the SSP to the slide motor 5a to the target position, and the DSP unit 2 in accordance with the control signal output from the microcomputer 3 Video signal from output digital signal And an MPEG decoder 6 for separating and decoding an audio signal and outputting the same, an image digital / analog converter 7 for converting an image signal output from the MPEG decoder 6 into an analog signal, and the MPEG An audio digital / analog switching unit 8 for converting an audio signal output from the decoding unit 6 into an analog signal, and an analog video signal output from the video digital / analog switching unit 7 as a composite video signal. A video encoding unit 9 and an audio amplifying unit 10 for amplifying and outputting an analog audio signal output from the audio digital / analog switching unit 8 to a predetermined level are provided.

A conventional optical disc reproducing apparatus configured as described above will be described below with reference to FIG.

The information of the disc is converted into an electrical signal by the high frequency amplifier 1, and the amplified high frequency signal is input to the DSP unit 2.

Then, the DSP unit 2 equipped with a servo circuit for driving the optical disc functions to decode the high frequency signal output from the high frequency amplifier 1 and correct an error of the disc.

In addition, the DSP unit 2 implements the overall operation of the optical disc through data communication with the microcomputer 3.

That is, when a user manipulates a key to play or search and play a video-CD in the key input unit 4, the microcomputer 3 searches for a key signal output from the key input unit 4 and outputs a signal corresponding thereto. Will output to (2).

Then, the SSP in the DSP unit 2 transmits data to the motor drive unit 5 to transfer the slide motor 5a to the selected target position.

After that, the digital data of the DSP unit 2 is transmitted to the MPEG-decoding unit 6 and the MPEG decoding unit 6 is output from the DSP unit 2. The video signal and the audio signal are separated from the digital signal, decoded, and output to the video digital / analog switching unit 7 and the audio digital / analog switching unit 8, respectively.

Accordingly, the image digital / analog switching unit 7 converts the digital image signal output from the MPEG decoding unit 6 into analog, and the image encoding unit 9 finally outputs it as a composite video signal, and audio digital The analog switching unit 8 converts the digital audio signal output from the MPEG decoding unit 6 into analog and amplifies the digital audio signal to a predetermined level through the audio amplifying unit 10 for final output.

However, such a conventional method of calculating the track of an apparatus for reproducing an optical disc has a problem that the advantages of the optical disc are deteriorated because the relative coordinates n + Δt Δt are calculated as tracks to find a target point at a constant forward speed regardless of internal / external periphery. There was this.

The present invention has been proposed in order to solve the problems of the prior art as described above, the present invention is to access the menu screen in the VCD 2.0 when the user makes a menu selection now access (double) twice the speed (Access) faster target point An object of the present invention is to provide a fast access method of an optical disc reproducing apparatus.

The present invention for achieving the above object comprises a first step of receiving an input for the target point search from the key input unit of the optical disc playback device to search whether the target point is inner or outer periphery; A second step of calculating the number of tracks to be searched according to the recognition of the inner / outer periphery of the target point of the first step; A third step of calculating the number of tracks to be accessed at high speed = the number of tracks to be searched-a preset proximity track number value using the number of tracks to be searched calculated in the second step; A fourth step of performing fast access to the track to be accessed calculated in the second step by n-folding the slide gain so that the search speed is n times (n = 2, 3, ...); The fifth step is to perform constant speed access by doubling the slide gain for the remaining tracks up to the number of tracks to be searched.

1 is a block diagram of a conventional apparatus for reproducing an optical disc.

2 is an operation flowchart for explaining a conventional reproducing apparatus of an optical disc.

3 is a block diagram of an optical disc reproducing apparatus according to the present invention.

4 is a flowchart illustrating a fast access method of the optical disc reproducing apparatus according to the present invention.

Explanation of symbols for the main parts of the drawings

101: key input portion l02: high frequency amplifier

103: DSP section 104: SSP section

105: motor drive unit 106: microcomputer

107: MPEG decoding unit 108: Video digital / analog switching unit

109: audio digital / analog switching unit

110: video encoding unit 111: audio amplification unit

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

3 is a block diagram of an optical disc reproducing apparatus according to the present invention, and FIG. 4 is a flowchart illustrating a fast access method of the optical disc reproducing apparatus according to the present invention, and a key input unit for implementing a function desired by a user. 101, a high frequency amplifier 102 for converting the data optical signal of the disk into an electrical signal at the pickup, amplifying and outputting the signal to a predetermined level, and a DSP 103 for error correction and demodulation of the data of the disk; The SSP unit 104 for controlling the sub, the motor drive unit 105 for transmitting the data according to the control signal output from the SSP unit 104 to transmit the slide motor 105a to the target position, and the optical disc as a whole. And digital data of the DSP unit 103 according to the control signal output from the microcomputer 106 for controlling the MPEG decoder and controlling the MPEG decoder. An MPEG decoding unit 107 for demodulating and decompressing compressed data of a disc, an image digital / analog switching unit 108 for converting an image signal output from the MPEG decoding unit 107 into an analog signal, and the MPEG decoding unit An audio digital / analog switching unit 109 for converting an audio signal output from the analog signal to an analog signal, and an image decoding for outputting the analog video signal output from the video digital / analog switching unit 108 as a composite video signal. A unit 110 and an audio amplifier 111 for amplifying and outputting an analog audio signal output from the audio digital / analog switching unit 109 to a predetermined level.

4 is a flowchart illustrating a fast access method of an optical disc reproducing apparatus according to the present invention, wherein an input for searching for a target point is received from a key input unit of the optical disc reproducing apparatus to search whether the target is an inner / outer periphery. Step 1; A second step of calculating the number of tracks to be searched according to the recognition of the inner / outer periphery of the target point of the first step; A third step of calculating the number of tracks to be accessed quickly = the number of tracks to be searched-the preset number of adjacent tracks using the number of tracks to be searched calculated in the second step; A fourth step of performing a fast access to the track to be accessed calculated in the second step by n-folding the slide gain so that the search speed is n times (n = 2, 3, ...); A fifth step is performed for performing constant speed access by doubling the slide gain for the remaining tracks up to the number of tracks to be searched.

Referring to Figures 3 and 4 attached to the operation and effect of the present invention configured as described above are as follows.

First, when the power switch is turned on in the key input unit 101, the microcomputer 1006 detects this.

The microcomputer 106 then reads the area of TOC (Tab1 of Contents) in the area of the optical disc.

Since the PSEC portion of the TOC region where the AO region PMIN, PSEC, and PFRAM information is written indicates the type of the disk, this portion is searched to determine the disk.

In the case of a video-CD, track 1 information is read. Then, when a user presses a play key of the key input unit 101, the micom 106 transmits the track 1 information to the MPEG decoding unit 107 to PBC. The menu screen is displayed to the user so that it can

Meanwhile, when the user selects the menu screen of the key input unit 101, the microcomputer 106 sets the target point position at the current point position to calculate the relative coordinate time, and detects whether the target point is outer / inner. In other words, if the value of 1/2 of the TOTAL absolute time TlME value is the center value, the center value is determined to be the inner circumference. Otherwise, the center value is determined to be the outer circumference.

In this case, the number of tracks is calculated based on the center of absolute time by calculating the number of frames per track from 7 to 8 frames for the inner circumference and 14 to 15 frames for the outer circumference.

As an example, in the track calculation method shown in FIG. 4, the absolute time can be known when the TOC is read, and is set to the internal / external discrimination center time.

If it is 20 minutes, it is judged as the inner circumference. If it is the inner circumference, it is 7 to 8 frames. X: 75 frames = 1 track: 7 frames X ≒ 10 tracks / second. The number of tracks in the next 75 frames / second (therefore the target position 20 minutes (20 minutes-10 minutes (current position))) is known as 6000 tracks / 10 minutes.

After calculating the number of tracks described above, in the microcomputer 106, the gain (GAIN) is doubled ($ 31, $ 32 (three times)) with the serial data in the SSP unit 104, and the motor drive unit 105 is now $ 30. Will be sent to.

Then, the motor drive unit 105 transmits the data according to the control signal output from the SSP unit 104 to transmit the slide motor 105a to the target position, limit the target position to 300 tracks less than the position and less than 300 tracks. In the position close to the final target position, 100 tracks → 10 tracks → 1 track jump in order to find the final target position without error.

However, during the slide transfer command, the PLL of the DSP unit 103 (frequency + phase control) performs phase control only, and after completing the slide transfer, the tracking servo performs frequency control to increase stability of fast access. .

4 is a flowchart illustrating the operation of the present invention, which performs a first step of receiving an input for a target point search from a key input unit of an optical disc reproducing job and searching whether the target point is inner / outer, and the target of the first step is Performing a second step of calculating the number of tracks to be searched according to whether the point is an inner or outer periphery; Performing a third step of calculating the number of tracks, and performing a fast access to the track to be accessed calculated in the second step by n times the slide gain so that the search speed is n times (n = 2, 3, ...). Step 4 is performed, and a fifth step of performing constant speed access by doubling the slide gain for the remaining tracks up to the number of tracks to be searched is performed.

As described above, the present invention has the effect that the desired data can be enjoyed at a short time by reducing the access time in the case of a CD / Video-CD optical disc. Since browsing the screen takes a considerable time, fast access to such menu information reduces the time required to be interactive, thereby facilitating user convenience.

Claims (2)

A first step of receiving an input for searching for a target point from a key input unit of the optical disc reproducing apparatus and retrieving whether the target point is inner or outer; A second step of calculating the number of tracks to be searched according to whether the target point of the first point is an inner / outer periphery; A third step of calculating the number of tracks to be accessed quickly = the number of tracks to be searched-the preset number of adjacent tracks using the number of tracks to be searched calculated in the second step; A fourth step of performing a fast access to the track to be accessed calculated in the second step by n times the slide gain so that the search speed is n times (n = 2, 3, ...); And a fifth step of performing constant speed access by doubling the slide gain for the remaining tracks up to the number of tracks to be searched. Fast access method of the device. The method of claim 1, wherein the constant speed access to the remaining tracks up to the number of tracks to be searched determines the number of tracks remaining and searches for the final width mark by varying the number of track jumps according to the number of tracks remaining. Fast access method of an optical disc player.