KR100240337B1 - Repetitive reproduction method of a video compact disc player - Google Patents

Abstract

The present invention relates to a repetitive playback method of a compact disc player. (A) When a predetermined disc is loaded, a table of contents (TOC) data is read and stored, and an EX-OR operation is performed on the TOC data to checksum the data. (check) obtaining data, setting and storing the checksum data as a unique number of the disk, and setting and storing each of the inputted repeating playback sections in order of priority, and repeating playback for each section; and (B) if a random repeat play key signal is input after step (a), comparing a checksum of a disc for random repeat play with previously stored checksum data to determine whether the same checksum data exists; (B) if the same checksum data exists, determining whether there is a repeat playback section for the checksum data; In step (c), if there are two or more sections of the repeat play section, a random variable is set, and the repeat play section selected by the set random variable is repeatedly played, but the random variable is increased while the repeat play is performed. And repeating the reproducing section for all previously stored reproducing sections so that the next reproducing section to be selected can be set randomly.

Description

How to play video compact disc player repeatedly

The present invention relates to a repetitive playback method of a video compact disc player. In particular, in executing a repetitive playback, a video compact disc player is configured to execute repetitive playback by randomly setting a repetitive playback order for a plurality of stored repetitive playback sections. It relates to a repeat playback method of.

With the development of audio and video media, optical disc players for recording and reproducing video and audio data on semi-permanent optical discs have been developed.

Such an optical disc player reproduces an image and / or audio recorded on an optical disc and outputs it through a screen and / or a speaker, and has a higher signal-to-noise ratio than conventional image and / or audio reproducing apparatus, resulting in better image quality and / or Or it can reproduce the signal with sound quality, it does not generate noise due to irregular reproduction and modulation, very low distortion, no ghost and random access, so it is rapidly developed and widely distributed. There is a trend.

In addition, such an optical disk player includes a compact disk player (CDP), a laser disk player (LDP), a compact disk graphic player (CDGP), and a video compact disk player (VCDP: video compact disk player) has been developed and widely used.

On the other hand, among such optical disc players, the video compact disc player has a built-in repeat play function for convenience. The repeat play function repeats a predetermined number of times for a desired track or a desired section on a given disc. It is used for various purposes, and in particular, it is widely used for learning languages.

In addition, the repeat playback function can not only repeat playback a predetermined number of times for one desired track and one section, but also repeat playback for more tracks and sections for which repeat playback is desired.

However, as described above, when the repeat play is performed on a plurality of input and stored repeat play sections, the repeat play order is sequentially performed from the first input repeat section or sequentially from the repeat section having a fast playback time. In this case, there was a problem that the user may feel bored when performing the repeated playback.

Accordingly, the present invention has been made to solve such a problem in the related art, and an object of the present invention is to generate a random variable in performing repetitive playback in a video compact disc player and to reproduce a plurality of repetitive playback sections as the random variable. It is to provide a repetitive playback method of a video compact disc player that can perform repetitive playback by setting the order.

According to a preferred embodiment of the present invention for achieving this object, a repetitive reproduction method of a video compact disc player for reproducing the reproduction order randomly in executing repetitive reproduction for a plurality of repetitive reproduction sections. (A) reading and storing TOC (table of contents) data when a predetermined disk is loaded, and performing EX-OR operation on the TOC data to obtain checksum data and storing the checksum data. Setting and storing as a unique number of the disc, and setting and storing each repeated playback section to be prioritized, and repeating playback for each section; and (b) random repeating after the step (a). When the play key signal is input, the checksum data of the disc for random repeat play is compared with the previously stored checksum data. (C) determining whether there is a repeat playback section for the checksum data if the same checksum data exists in step (b), and (d) repeating in step (c) If there are two or more sections, a random variable is set, and a repeating playback section selected by the set random variable is repeatedly played. However, the repeating playback section that is selected next by increasing the random variable even while the repeating playback is executed is also performed. And repeating playback for all previously stored repeat playback sections so as to be set randomly.

1 is a schematic block diagram of a general optical disc player for practicing the present invention;

2 is a detailed flowchart of a repetitive playback method of a video compact disc player according to a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

10: pickup and actuator unit 20: RF signal amplification and servo signal processing unit

30: motor and motor drive unit 40: key input unit

50: microcomputer 60: digital signal processing part

70: MPEG decoder 80: Audio signal processor

90: video signal processing unit 100: speaker

110: Screen

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

1 is a schematic block diagram of an optical disc player for practicing the present invention.

As shown in FIG. 1, an optical disc player for carrying out the present invention includes a pickup and actuator unit 10, an RF (radio frequency) signal amplification and servo signal processor 20, a motor and motor driver 30, and a key input unit. 40, the microcomputer 50, the digital signal processor 60, the MPEG decoder 70, the audio signal processor 80, the video signal processor 90, the speaker 100, and the screen 110.

The pickup and actuator unit 10 performs an optical pickup from a disc loaded in a disc tray (not shown), and outputs the RF signal read out to the RF signal amplification and servo signal processing unit 20 accordingly.

In addition, the motor and the motor driving unit 30 drive the spindle motor (not shown) to rotate the disk and drive the actuator unit 10 so that the pickup unit 10 performs optical pickup to read data recorded on the disk. To output as an RF signal.

The RF signal amplification and servo signal processing unit 20 amplifies the RF signal provided from the pickup and actuator unit 10 and provides a servo control signal according to the signal to the motor and the motor driving unit 30 to provide the focus servo and the tracking servo. To be done.

The digital signal processing unit 60 digitally processes the amplified RF signal provided from the RF signal amplification and servo signal processing unit 20, performs error detection and error correction, and outputs the result to the MPEG decoder 70.

The MPEG decoder 70 decodes an error corrected digital video signal and an audio signal provided from the digital signal processor 60 based on the MPEG compression format and outputs the decoded video signal to the video signal processor 90 and the audio signal processor 80. .

The audio signal processing unit 80 and the video signal processing unit 90 process the decoded audio and video signals provided from the MPEG decoder 70 and output them to the speaker 100 and the screen 110, respectively. And the screen 110 are displayed as an audio and an image, respectively.

On the other hand, according to the present invention, the microcomputer 50 reads and stores TOC (table of contents) data indicating the disc contents information recorded in the lead-in area of a predetermined disc loaded in the disc tray. When stored in the internal memory of the microcomputer 50), the TOC data is exclusively ORed to obtain check sum data. Since the TOC data for all disks are different except for the same disk, the checksum data is different. Is set to be stored in the internal memory as the unique number of the disc, which is then used to identify whether the disc loaded in the disc in the random repetitive reproduction has been previously performed repetitive reproduction.

In addition, when the storage of the checksum data for a predetermined disk is completed, when the repeat play key signal and the repeat play section data, that is, time data for the repeat play start and end positions, are input, the microcomputer 50 stores the data in the memory. Then, playback is performed for each repeating section. The checksum data and repeating playback section data for this predetermined disk are stored and maintained even after the repeating playback is completed.

On the other hand, after the above-described repeat play process is completed, when a random repeat play key signal is input from the key input unit 40, the microcomputer 50 obtains checksum data from the TOC of the disc currently loaded in the disc tray. Is compared with the previous checksum data previously stored in the memory to determine whether the same checksum data exists. In this case, if the same checksum data exists, the microcomputer 50 again has two or more repeat playback sections corresponding to the checksum data. Determine whether In other words, the existence of the same checksum data indicates that the disc has previously performed a function such as repeat play, and thus it is determined whether there is a previously repeated play section for the currently loaded disc. As described above, the reason for determining whether there are two or more repeat playback sections is that when there is only one repeat playback section, there is no meaning of random repeat playback in which the priority is arbitrarily determined and the repeat playback is executed.

On the other hand, according to the present invention, if there are two or more repeat playback sections, the microcomputer 50 checks the current system clock signal and uses the system clock and the number of repeat playback sections to determine a random variable, that is, repeat playback. Choose a priority. For example, if the playback interval is 4 and the current counted system clock is 6 (the system clock is incremented by '1' each time each system loop is completed) then the random variable is '2'. Therefore, the microcomputer 50 plays the second stored repeat play section first. This random variable is also continuously increased while performing repetitive playback. When a random variable is set for a repeating section that has already been played when repeating playback for one section is completed, the repeating playback is performed by selecting a section that has not been played while reducing the random variable by '1'. When the playback is completed, the system is stopped when the playback for the repeated playback section is completed.

On the other hand, the microcomputer 50 stores a current checksum in a memory and repeats it later when there is no checksum data that is equal to the elapsed time when a random repeat play key signal is input and the checksum of the current disc is compared with a previously stored checksum. When a reproduction key signal is input, repeat playback is performed and the repeat playback data is stored and set at the same address as the checksum data.

Fig. 2 is a detailed block diagram showing a method for performing repetitive playback of a video compact disc player according to a preferred embodiment of the present invention.

When a predetermined disc is loaded in step S10, the TOC data recorded in the lead-in area is read and stored in step S20, and the process proceeds to step S30 when step S20 is completed.

Then, in step S30, an EX-OR operation is performed on the TOC data to obtain check sum data, and the flow advances to step S40 to determine whether a repetitive playback key signal is input. In step S40, the repetition reproduction key signal is input, and then, in step S50, if the repetition interval data is input, in step S60 the checksum data calculated in step S30 and the repetition interval input in step S50 The data is first stored and stored at the same address, and then the flow advances to step S70 to repeat playback for the inputted repeating section. When repeating playback is completed, the flow returns to repeat.

On the other hand, if the repeat playback key signal is not input in step S40, the flow advances to step S80, and in step S80 it is determined whether the random repeat playback key signal is input. If the random repetitive playback key signal is not input in step S80, the flow returns to step S40, and if so, the flow advances to step S90.

If a random repeat play key signal is input in step S80 and the process proceeds to step S90, in step S90, the checksum data for the current disk is compared with the previously stored checksum data, where the same checksum data exists. If yes, the process proceeds to step S100 and, if not present, to step S170.

First, when the process proceeds from the step S90 to the step S100, in step S100, it is determined whether there is repeated playback data for the previously stored checksum data. If not, the process proceeds to the step S190 to perform a random repeat playback function. After canceling, the flow ends, and when it is finished, the flow advances to step S110 to determine whether the stored repeat playback section is two or more.

If at step S110 the repeat playback section is not two or more, i.e., if there is one, the process proceeds to step S200 and proceeds to step S160 where the repeat playback for the section is performed. Proceed to set the random variable using the system clock and repeat the selected section according to the set random variable.

Then, in step S130, it is determined whether the repeat playback for the section selected in step S120 is completed. If the repeat playback is not completed in step S130, the process proceeds to step S140 in which a random variable according to the system clock is performed. Increase to '1' and return to step S130. If the playback is completed, it is determined whether the random repeat playback for all the repeated playback sections is completed in step S150, and if not, the process returns to step S120. If the flow is again performed and the process is completed, the process proceeds to step S160. If the process proceeds from the step S150 or the step S200 to the step S160, the step S160 stops the system and ends the flow.

On the other hand, if there is no previously stored checksum data equal to the current checksum data in step S90, the flow advances to step S170 to determine whether the disk tray is opened or closed. If the disk tray is open-closed in step S170, the flow advances to step S180 to store the current checksum data and returns the flow, and immediately ends the flow if the disk tray is not open-closed.

As described above, the present invention has an effect that the user does not feel bored about the repeated playback since the playback order is randomly set in the repeated playback for a plurality of sections in the video compact disc player.

Claims (1)

In the repetitive playback method of a video compact disc player for reproducing a repetitive playback of a plurality of repetitive playback sections by setting the playback order to random, (A) When a given disk is loaded, it reads and stores table of contents (TOC) data, and performs EX-OR operation on the TOC data to obtain checksum data and stores the checksum data inherent to the disk. Setting and storing the number of repetitive repetition sections inputted in priority order, and performing repetitive reproducing for each section; (B) if a random repeat play key signal is input after step (a), comparing a checksum of a disc desired for random repeat play with previously stored checksum data to determine whether the same checksum data exists; (C) if the same checksum data exists in step (b), determining whether there is a repeat playback section for the checksum data; (D) If there is more than two sections of the repeat playback section in step (c), set a random variable, and repeat playback of the selected repeat playback section selected by the set random variable, and repeat the random variable while the repeat playback is executed. And repeating playback of all previously stored repeat playback sections so that the next repeat playback section that is incremented to be selected at random may be set to be random.

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