KR100203859B1 - Control signal detecting method of video compact disc - Google Patents

Abstract

The present invention relates to a method for detecting a control signal of a video compact disc, and more particularly, to view only a portion of a video recorded on a video compact disc by a user, and to control a control signal through a code not used in a control signal on a sub code. It relates to a method for detecting.

In other words, one of the two 4 bits that is not used among the 4 bit control signals recorded in the subcode of the video compact disc indicates that the corresponding track is a warning, advertisement or trailer, and the other 4 bits By indicating that the corresponding track is the original video content, the user can select and play the video compact disc up to the first half and the main content at the time of initial playback, or only the initial playback is provided to provide convenience for the playback of the video compact disc.

Description

Control signal detection method of video compact disc

1A is a diagram relating to signals recorded on a conventional video compact disc.

1B is a diagram relating to the format of a frame of a conventional video compact disc.

1C is a block diagram of a sub code and a frame of a conventional video compact disc.

2 is a diagram in which a control signal is recorded with four flag bits on a sub code and a frame of a conventional video compact disc.

3 is a diagram in which a control signal is recorded with four flag bits on a subcode and a frame of a video compact disc according to the present invention.

4 is a control flowchart of a method for detecting a control signal of a video compact disc according to the present invention.

The present invention relates to a method for detecting a control signal of a video compact disc, and more particularly, to view only a portion of a video recorded on a video compact disc by a user, and to control a control signal through a code not used in a control signal on a sub code. It relates to a method for detecting.

In general, a video compact disc (VCD) is produced by producing a variety of video CDs, such as a variety of culture and music, including a movie with a video and sound, VCD is released as a video compact disc player ( It is driven by a Video-Compact Disk Player (VCDP), and the VCDP is expected to be in great demand at a time when the production cost of the VCD is significantly reduced.

In addition, the format of the CD is different according to the standard, CD-1 follows the Green Book format, VCD is based on the White Book format. Red Book format was published in 1980 as a standard for audio CDs. The recording method of audio data is also called CD-DA.

In addition, the Yellow Book format is a standard for computer data CDs published in 1983. The Yellow Book format defines the structure of data based on the Red Book. The Green Book format is a CD. The specification for -I was published around 1988, and in 1989 the specification for CD-I, which records figures, text and screens, was defined. In addition, White Book Format is a format of CD-ROM originating from home appliance field, and it is a standard that plays video and audio from CD-ROM using MPEG.

Conventional video compact discs have grooves called pits having digital information on one side thereof as a base material of a transparent plastic disc having a constant diameter and a constant thickness. The pits are arranged side by side in the circumferential direction at regular intervals. An aluminum film for reflecting the laser light is deposited on the pit surface, and a label coating for displaying the contents of the image thereon and a protective coating to prevent scratches, contamination, and oxidation of the aluminum reflective film.

In addition, a hole is formed in the gown of the disc so as to minimize eccentricity during reproduction, and a clamp area is designed around the center hole to clamp the disc up and down.

The signal recorded on the disk is divided into three parts: a read-in area, a program area, and a read-out area from the inside, as shown in the plan view of FIG. It is. The lead-in area is called TOC (Table Of Contents), which is recorded on the disk, that is, each address and total time. The contents of the disc are put together.

The lead-in area starts within a certain diameter and continues until immediately before a program start position of a certain diameter. In this area, the TOC signal is repeatedly recorded. When the disc is played back recently, the playback time in the disc is immediately displayed, but the reason is that the TOC is read and displayed at the same time as the disc is loaded.

The program area is an area where video and audio signals are recorded, starting from a certain diameter and up to a certain diameter.

The lead-out area is an area of the signal indicating the end of the program. The lead-out signal is recorded from the end position of the program area to an area about 0.5 mm outside of the radius.

When the pit group of the track wound in a spiral is enlarged, as shown in Fig. 1b, there is a specific arrangement of pits at certain intervals, and when the pit groups are divided into blocks, the synchronization signal is periodically present in the pit train. The block from the synchronization signal to the next synchronization signal is called a frame.

This frame includes a sub code containing control information and various service information, starting with a synchronization signal indicating the beginning of the frame, that is, a control signal, followed by 6-word (96-bit) video and sound. Signal and error correction signal.

The subcode includes control information and various service information for the disc. The subcode is also called a user bit or a control signal, and the subcode is a code for facilitating the use of the disc for the user. to be. These subcodes consist of eight channels, P to W. Among these channels, P and Q channels are most commonly used, and still pictures are recorded using R and W channels.

In addition, in FIG. 1C, one subcode is contained in one frame, and since only one subcode has a small amount of information, it is difficult to perform any operation. However, the subcode contains the same signal for each frame, so it looks like the second synchronization signal. Such a second frame is called a subframe, and is composed of 98 bits by adding a 4-bit control signal, a 4-bit address signal, a 72-bit signal, and 16-bit error correction bits, starting with a 2-bit synchronous signal. do.

Although the structure of the data signal in the sub code varies depending on the channel and the address value, the largest number of addresses in the case of the Q channel is 0001 (mode 1), and the index number, reproduction time, and accumulated time from the beginning of the program are recorded. The Q channel utilizes data of the Q signal relating to the presence or absence of pre-emphasis, distinction between two and four channels, the cumulative time of the program, the disc manufacturing number, and the like.

FIG. 2 is a diagram in which a control signal is recorded with four flag bits on a sub code and a frame of a conventional video compact disc. In the control signal on a sub code, 00 × 0 of 4 bits does not pass a preamplifier. Two channels, 00 × 1, are two channels of audio with preamplification of 50/15 μS. 10x0 is 4 channels of audio without a preamplifier, and 10x1 is 4 channels of audio with a preamplifier of 50 / 15μS. In addition, 01x0 is a track on which data is recorded, and 01x1 and 11xx are an unused track. xx0x is a bit to prevent copying of the compact disc, and xx1x is a bit to allow copying.

In this regard, a warning message or advertisement is inserted in the first half of a video compact disc such as a culture product or a flexible material including a movie, and the advertisement, warning message or trailer is usually composed of 3-4 tracks. That is, when the playback button is pressed after reading the TOC at the time of playing the video compact disc, a warning message or advertisement of a specific company is reproduced, and the original contents of the video compact disc are reproduced after the reproduction of such warning message or advertisement is completed.

Therefore, when the user plays back the video compact disc without having to watch the warning message or the advertisement text, the user has to go to the original video content using a quick search or search function.

In order to solve the above-mentioned disadvantages, the present invention ignores the warning messages and advertisements of the first half by the user's choice by using four bits which are not used in the control signals of the sub-Q channel when the video compact disc is manufactured. It is an object of the present invention to provide a method for detecting a control signal of a video compact disc for the convenience of a user of the video compact disc by initially reproducing only original image contents.

In order to achieve the above object, one of two four bits which are not used in a certain number of four bit control signals indicates that the corresponding track is a warning, advertisement or trailer, and another four bits By indicating that the corresponding track is the original video content, the user can select and play the video compact disc up to the first half and the main content at the time of initial playback or only the main playback.

In addition, a feature of the control signal detection method of a video compact disc according to the present invention is that a portion corresponding to a warning message or advertisement and a trailer recorded on a disc and a portion in which a video signal is recorded are not used among sub codes recorded on a Q channel. Distinguishing and setting each using a preliminary subcode; When a reproduction signal is applied, reading the subcode recorded in the Q channel on the video compact disc, and determining whether the read subcode is a subcode corresponding to the portion where the video signal is recorded; If the read control signal is a sub code corresponding to a portion in which the video signal is recorded, storing the track number in the storage means and reproducing the video signal recorded in the track; As a result of the determination, when the read control signal is not a sub code corresponding to the portion where the video signal is recorded, but a sub code of a warning text or a portion corresponding to the advertisement and trailer, the TOC information is stored and the video signal is recorded. The video signal is reproduced by jumping to a track.

Hereinafter, a method of detecting a data signal of a video compact disc according to the present invention will be described.

3 is a diagram showing data recorded on a 4-bit control signal of a subcode frame of a video compact disc according to the present invention. When the disc information is read in the lead-in area on the video compact disc, the start time and the total time of each track are shown. It can be seen. At this time, by using the reserved 4 bits of the control 4 bits divided into warning information, advertisements or trailers, and other information such as the movie so that you can immediately watch only the movie from the initial playback. That is, the video compact disc player records a warning message, a trailer or an advertisement message in 01x1 or 11xx among the bits not used in the control signal, or indicates that the video content of the main story is recorded.

Among the unused bits, 01x1 indicates that the corresponding track is an area where an advertisement, a warning or a trailer is recorded in the first half of the video compact disc. Further, judging, 11xx indicates that the corresponding track has recorded the video material of the main part. Accordingly, the video compact disc player determines that the first part is read when 01x1 is read by the control signal during the playback of the video compact disc roll, and the main part when 11xx is read. The first half consists of three to four tracks, and the subsequent tracks consist of the main video.

If the user inputs by operating a separate key to play the main part without playing the first half while the compact disc player is in operation, when the 01x1 is read by judging the control signal, the part jumps from the part where 11xx of the main part is read. Play it back.

This operation refers to the control flow chart of the control signal detection method of the video compact disc of FIG. 4, the video compact disc player reads the control signal recorded in the Q channel on the sub code of the video compact disc (S100). It is determined whether the control signal read out from the subcodes is 11xx (S101). If the read control signal is 11xx, the corresponding track number is stored in the storage means (S102). If not, the TOC information is stored (S103). This is when the user wants to play by watching the main part without playing the first half, and a separate key input must be preceded.

However, if there is no separate key input at the time of operation of the video compact disc player, it does not comply with the above control flow.

As described above, the present invention displays four bits which are not used in the control signals of the subcodes on the video compact disc, and displays the corresponding tracks related to the first half and the first half from the initial playback according to the user's selection. There is an effect that can provide convenience to the playback of the disc.

Claims (2)

In the method of reproducing a video compact disc, a portion corresponding to a warning message or advertisement and a trailer recorded on the disc, and a portion in which the video signal is recorded, are used by using unused subcodes among the subcodes recorded on the sub-Q channel. Setting a division; When a reproduction signal is applied, reading the subcode recorded in the Q channel on the video compact disc, and determining whether the read subcode is a subcode corresponding to the portion where the video signal is recorded; If the read control signal is a sub code corresponding to a portion in which the video signal is recorded, storing the track number in the storage means and reproducing the video signal recorded in the track; As a result of the determination, when the read control signal is not a sub code corresponding to the portion where the video signal is recorded, but a sub code of a warning text or a portion corresponding to the advertisement and trailer, the TOC information is stored and the video signal is recorded. The control signal detection method of a video compact disc, characterized by comprising the steps of reproducing the video signal by jumping to the track. The control of a video compact disc according to claim 1, wherein the sub code corresponding to the warning message, the advertisement, and the trailer recorded on the disc is 01x1, and the partial sub code on which the video signal recorded on the disc is recorded is 11xx. Signal detection method.