KR0174477B1 - Method for controlling exchange time of video cd - Google Patents

Abstract

The present invention relates to a video compact disc changer, and in particular, when watching a movie made with two or more video compact discs, a continuous movie watching is performed with two or more video compact discs by avoiding a common time caused by the exchange of the disc. The present invention relates to a control method of an exchange time of a video compact disc.

That is, a disk holder 10 having a plurality of video compact disks 1 embedded therein, and a video compact disk 1 being loaded from the disk holder 10 to rotate the video compact disk 1 or include recorded images and sounds. A drive unit 20 for reading data, a servo controller 30 for controlling the drive unit 20, a CD-ROM decoder 40 for reading video and audio data read from the servo controller 30, and And a memory unit 50 for storing a predetermined amount of video and audio data read from the CD-ROM decoder 40 and an MPEG decoder 60 for restoring the compressed video and audio data read from the memory unit 50. And an analog / digital converter 70 for converting the data restored by the MPEG decoder 60 into an analog signal and outputting the analog signal to the television monitor 90, the servo controller 30, the memory unit 50, For controlling the CD-ROM decoder 40 and the MPEG decoder 60, respectively. It is composed of a microcomputer 80 that outputs a control signal, and controls the video and sound of a plurality of discs in the same way as a single disc to increase convenience for a user using a video compact disc changer.

Description

How to control the exchange time of a video compact disc

1 is a block diagram of a video compact disc changer according to the present invention.

2 is a control flowchart of driving a video compact disc changer according to the present invention.

* Explanation of symbols for main parts of the drawings

10 disc holder 20 drive unit

22: servo motor 24: pickup

30: Servo controller 40: CD-ROM decoder

50: memory 60: MPEG decoder

70: analog / digital converter 80: microcomputer

90: TV monitor

The present invention relates to a video compact disc changer, and in particular, when watching a movie produced with two or more video compact discs, continuous movie watching is performed with two or more video compact discs so that a blank time due to the exchange of the disc does not occur. The present invention relates to a control method of an exchange time of a video compact disc.

In general, a video compact disc changer includes a plurality of video compact discs in a storage means, and the video compact disc changer loads a video compact disc that a user wants to watch and monitors the video and sound recorded on the TV monitor. It can be watched through the back. These multiple video compact discs are selected sequentially or randomly.

Such a video compact disc (VCD) is produced by producing a variety of video, such as a variety of culture and music, including a movie and a movie containing a video and sound is produced as a VCD title, such VCD is 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 when the production cost of the VCD is significantly reduced.

Conventional digitized video files are quite large in size, which makes them difficult to use as they are. However, since video CDs use a video compression technology called MPEG, a maximum of 74 minutes of video can be viewed. As a result, video CDs can record about 70 minutes of video and audio. Each CD has been spotlighted as a new medium because of its semi-permanent life and easy storage.

MPEG stands for Moving or Motion Picture Experts Group and is a standard for video and audio compression. MPEG is a compression technology that is advantageous for multimedia communication such as video on demand (VOD) and video telephony due to low transmission cost at a high compression ratio. Such MPEG has been proposed from MPEG-I to MPEG-IV.

As a standard for moving picture data compression and reconstruction, M-JPEG has recently emerged following MPEG. M-JPEG is an abbreviation of Motion-Joint Photographic Experts Group, which is a continuous application of JPEG, a compression method for still images, to frames. In other words, it is a technique that creates a moving picture by spraying a compressed frame that deletes the same portion within one frame up to 24-30 frames per second.

However, MPEG is a method of applying the change encoding technique to record not only within a frame but also a portion changed between frames. MPEG shows three pictures: I-Picture, B-Picture, and P-Picture. In brief, I-Picture refers to the whole screen, and B-Picture only stores changes to the front screen, and P-Picture stores changes to both front and back screens.

Such a VCDP driving a conventional VCD is a video compact that drives one VCD to output video and sound, and a plurality of VCDs are built in to sequentially or selectively select a VCD to output the video and sound contained in the VCD. There is a disk changer. Types of the video compact disc changer include a roller type and an elevator type. The roller type is to select a VCD by using a plurality of VCD to rotate the roller, the elevator type is to load a plurality of VCD in the holder to raise and lower the holder to output the image and sound of the selected VCD.

When using such a conventional video compact disc changer, when the next disc is played back after the playback of the picture and sound of the first disc when the next disc is exchanged and played on the disc currently being played back, the first picture and sound are reproduced. After the disc is replaced, normal video and sound are output only after a predetermined time has elapsed until the disc is normally played. That is, when the next disc is played back after the first disc is played, the first disc is stored in the holder, and the next disc to be played from the holder must be moved to play the disc. in need. Therefore, when watching a movie with a video compact disc changer, a blank time occurs in the middle of the screen of the television monitor during the exchange time of the disc without reproducing the image and sound.

Therefore, there is a disadvantage that can spoil the viewer's feeling of watching a movie consisting of a plurality of video compact disc with VCD changer.

The present invention has been made in view of the above-described disadvantages, and when the movie or the like consisting of two or more video compact discs is removed, the replacement time of the video compact disc changer is eliminated so that the video and sound recorded in two or more pieces are continuously played. The purpose is to ensure the reliability of the video compact disc changer by playing the video compact disc so that the user cannot recognize the replacement time of the video compact disc.

The above object is to provide a disk holder with a plurality of video compact discs, a drive unit for loading a video compact disc from the disk holder to rotate the video compact disc or read recorded video and audio data, and to control the drive unit. A servo control unit, a CD-ROM decoder for reading video and audio data read from the servo control unit, a memory unit for storing a predetermined amount of video and audio data read from the CD-ROM decoder, and a read out of the memory unit. An MPEG decoder for restoring compressed video and audio data, an analog / digital converter for converting the data restored in the MPEG decoder into an analog signal and outputting the signal to a television monitor, the servo control unit, a memory unit, a CD-ROM decoder, It is configured to include a microcomputer that outputs a control signal that controls each MPEG decoder. Can be achieved as

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a video compact disc changer according to the present invention. The reference numeral 10 denotes a disc holder mounted inside the video compact disc changer to embed a plurality of discs 1, and the reference numeral 20 denotes the above. The drive unit reads the recorded video and sound data by driving the disk 1 loaded from the disk holder 10.

The drive unit 20 includes a servo motor 22 that rotates the loaded disk 1 at a predetermined rotation speed, and an optical pickup 24 that reads data contained in the disk 1 as the servo motor 22 rotates. It consists of.

In addition, reference numeral 30 denotes a servo controller which controls the driver 20 or reads data from the driver 20, and reference numeral 40 reads an image and sound output from the servo controller 30. It is a CD-ROM decoder to take out.

In addition, reference numeral 50 is a memory unit for storing a predetermined amount of data output from the CD-ROM decoder 40 or a plurality of control programs embedded therein, and reference numeral 60 is read from the memory unit 50. MPEG decoder which restores compressed video and audio data.

Reference numeral 70 denotes an analog / digital converter for converting video and audio data, which is a digital signal restored by the MPEG decoder 60, into an analog signal and outputting the analog signal to the television monitor 90. Also, reference numeral 80 denotes a control signal for controlling the servo control unit 30, the CD-ROM decoder 40, the memory unit 50, the MPEG decoder 60, and the analog / digital conversion unit 70, respectively. It is a microcomputer to output.

The present invention having the above configuration will be described in more detail.

When playing two or more video compact discs 1 containing movies, cultures, or flexibles with a video compact disc changer, the first disc 1 is selectively loaded from the disc holder 10 into the drive unit 20. The first disk 1 loaded is driven by the servo motor 22 through the servo controller 30 under the control of the microcomputer 80. The rotational speed of the disk 1 is determined by the driving of the servomotor 22, which is controlled at an appropriate speed according to the output speed of the image and sound output by the microcomputer 80 to the television monitor 90.

That is, the sub-Q channel in the subcode is read from the first disk 1, and the data of the memory capacity is stored in the memory unit 40 at a predetermined double speed or more. The servo motor 22 is driven at a rotational speed equal to a predetermined capacity of the memory unit 50 to fill the memory unit 50 with a full. If the data is stored at a low capacity corresponding to the memory unit 50, the servomotor 22 is driven below the predetermined speed. The speed of 1x speed is maintained even if it is below the said fixed speed. Even if the speed is not 1x, the servo motor makes the disk transition to the 1x speed.

The video and audio data recorded on the first disk 1 are read by the optical pickup 24 configured on one side of the drive unit 20, and the read data is decoded by the CD-ROM decoder 40 via the servo controller 30. do. That is, the CD-ROM decoder 40 decodes the data signal recorded on the disc 1, and then synchronizes the data signal and checks the parity bit. The data decoded by the CD-ROM decoder 40 is input to the memory unit 50 and stored. At this time, by the control of the microcomputer 80 or by a program stored separately in the memory unit 50, the data stored in the memory unit 50 is decoded by the CD-ROM decoder 40.

Since the data decoded by the CD-ROM decoder 40 is in a compressed state, the data output from the memory unit 50 is restored by the MPEG decoder 60. Since the restored signal is a digital signal, it is converted into an analog signal by the analog / digital conversion unit 70 and output to the television monitor 90.

When the first disc 1 is reproduced in this manner and the signal recorded on the subcode configured on the frame of the disc 1 is read, the microcomputer 80 controls the servo controller 30 to control the disc 1. The rotation speed of the servomotor 22 to drive is increased.

That is, the subcode contains control information and various service information for the disc 1, and the subcode is also called a user bit or a control signal, and the subcode stores the disc 1 for the user. This code is for ease of use. These subcodes are composed of eight channels, P to W. Among these channels, P and Q channels are the most used at present, and recently, still pictures are recorded using R to W channels. The Q channel utilizes data of the Q signal relating to the presence or absence of pre-emphasis or distinction between two and four channels, the cumulative time of the program, the manufacturing number of the disc 1, and the like.

As described above, even when information indicating that the disk 1 is composed of two or more sheets is recorded on the Q channel of the subcode, the first disk 1 has a constant speed corresponding to the storage capacity of the memory unit 50. The above-described drive and data stored in the memory unit 50 are transferred to the TV monitor 90 through the MPEG decoder 60 and the analog / digital conversion unit 70 for the next time to replace the disc. Will print each one.

Further, even after the second disk is exchanged, the microcomputer controls the servo controller 30, and the servo controller 30 controls the rotational speed of the servo motor 22 to move the disk 1 above a predetermined speed. It rotates to always fill the storage capacity of the memory unit 50. When the data in the memory unit 50 is full, the servo motor 22 is driven at 1x speed. Therefore, the microcomputer 80 determines the storage capacity of the memory unit 50 and outputs a control signal to the servo controller 30 to control the rotational speed of the servo motor 22 of the driver 20.

When the rotational speed of the servo motor 22 increases in the driving unit 20, the microcomputer 80 continuously stores the data input after the subcode is read through the CD-ROM decoder 40 and the memory unit 50. do. This data is stored up to a certain amount and then outputs the data sequentially. The output data is converted into video and sound to the television monitor 90 through the MPEG decoder 60 and the analog / digital converter 70.

When the reproduction of the first disc 1 is completed, the first disc 1 is unloaded into the disc holder 10, and the next disc 1 is loaded into the drive unit 20. At this time, the data of the first disk 1 stored in the memory unit 50 is sequentially signal-processed during a predetermined exchange time during which the first disk 1 is unloaded and the second disk 1 is loaded. do.

The microcomputer 80 reads information that is an image made up of two or more disks recorded in the subcode of the disk 1, and drives the servo motor 22 at a predetermined speed or more in advance to drive the information of the disk 1 into the memory unit. By storing to 50, the TV monitor 90 continuously outputs to the television monitor 90 without interruption the video and sound information of the disc 1 during the exchange time until the next disc 1 is loaded. It is for the convenience of the user.

The control signal of the microcomputer 80 as described above will be described with reference to the control flow chart of FIG. 2.

The microcomputer 80 outputs a control signal to the servo controller 30 to control the rotational speed of the disk 1 through the driver 20. When the information of the disc 1 is input from the optical pickup 24 of the drive unit 20, the microcomputer 80 reads the sub code input from the disc 1 (S101).

It is determined whether or not data is stored in the memory state corresponding to the memory capacity of the memory unit 50 in the subcode recorded on the disc 1 (S102). In other words, it is determined whether the data read from the disk 1 has been stored in a state in which the storage capacity of the memory unit 50 is full. At this time, if all data is not stored in the capacity of the memory unit 50, the microcomputer 80 controls the servo control unit 30 to drive the rotational speed of the servo motor 22 of the drive unit 20 to a predetermined speed or more. (S103).

If the data in the memory unit 50 is full in step S102, it is determined whether the rotational speed of the servomotor 22 is being rotated at 1x speed (S104). If the speed of the servo motor 22 is not 1x, the microcomputer 80 controls the servo controller 30 to drive the servo motor 22 at 1x (S105).

If the rotational speed of the servomotor 22 is 1x in step S104, the total regeneration time according to the regeneration of the disc 1 is compared with the present regeneration time (S106). That is, if the playing time of the currently playing disc is longer than the current playing time as compared with the playing time of the entire disc, the disc is continuously played, and the current playing time is not less than the total playing time. In the case where the playback of the first disc is terminated, the disc is replaced (S107).

This means that when the total playback time of the disc is the same as the current time, the data recorded on the current disc is already stored in the memory unit 50 through the optical pickup 24, and the memory unit in which the residual data is stored ( 50 stores a certain amount of data and is reproduced to the television monitor 90 through the MPEG decoder 60 and the analog / digital conversion unit 70 at a predetermined time.

In other words, even when the first disc has finished all reproduction, a certain amount of data, which is the latter part of the disc, can be reproduced for a predetermined time while already stored in the memory unit 50. At this time, the storage capacity of the memory unit 50 should be equal to or longer than the exchange time of the first disk and the second disk.

Therefore, even when the disc is replaced, the image and sound are continuously output through the television monitor 90 so that the user cannot feel the disc replacement state.

As shown in the control flowchart, the rotation speed of the disc is driven at a constant speed so that the data is always stored in the memory unit 50 at the start of playing the disc, and the data is in the full state in the memory unit 50. In this case, after reproducing the stored data after driving at the normal speed, the next loaded disc is driven at a constant speed. At this time, the playback time is based on the Red Book of the disc.

This format is different according to the standard of the CD. The CD-I follows the Green Book format, and the 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. It defines the format of the structure 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, the white book format is a format of CD-ROM originating in the home appliance field and is a standard for playing video and audio from a CD-ROM using MPEG.

At the start of the playback, the disk 1 is rotated at twice or more speeds to read and store data for a predetermined time in the memory unit 50. For example, the memory capacity required by the memory unit 50 requires 640 Mbytes for 74 minutes and about 1.44 Mbytes for 10 seconds.

That is, when the remaining time of the disc 1 is reproduced, the data input to the memory unit 50 is continuously stored, and when the disc 1 is reproduced at normal speed, the entire disc 1 is read when the sub-Q channel is read. When the reproduction end time of the disc 1 is reached in comparison with the time, the disc 1 is replaced. Therefore, during the exchange time, the user can watch the playback picture continuously through the television monitor 90 so that the exchange of the disc 1 cannot be felt.

The present invention controls the time for replacing a video compact disc, and the servo motor of the drive unit uses the Q channel information recorded on the sub code of the disc when a movie, culture or flexible material composed of a plurality of discs is reproduced on a television monitor. By controlling the rotational speed of the disc to eliminate the gap time caused by changing the disc, the user can not play the disc and play the disc in the same way as playing a single disc. It is effective to increase convenience for users who use disk changers.

Claims (3)

The subcode recorded on the video compact disc is read, and it is determined whether it is stored in the memory state corresponding to the memory capacity of the memory unit (S101) (S102), and the corresponding memory capacity in the step (S101) (S102). If not, the step of driving the rotational speed of the servo motor of the drive unit more than a predetermined speed (S103); If the memory capacity of the corresponding step (S103), the driving step of driving the servo motor at a constant speed (S104) (S105); Determining the present time and the total time of the disc while the disc is being reproduced at a constant speed in the step (S104) (S105); Exchanging the disc when the total time is less than the current time of the disc in step S106; Time control method of the video compact disc consisting of. The method of controlling an exchange time of a video compact disc according to claim 1, wherein the rotation speed of the servo motor of the driving unit is driven at two times or more in the step (S103). The method of controlling a swapping time of a video compact disc according to claim 1, wherein the memory capacity of the memory unit in the step (S103) is a capacity capable of outputting data for more than a swapping time of the disc.