KR19990042709A - Double speed playback method of digital video disc - Google Patents

Abstract

According to the present invention, when a user requests a digital video disc speed playback, the base frame (I frame) of the main video and corresponding sub picture data are intermittently selected from the data read out and stored by the pickup unit according to the user requested speed. The present invention relates to a double speed playback method of a digital video disc that allows a user to perform screen search while acquiring not only the main video but also sub-picture information during double speed playback. A first step of temporarily storing recorded data on the digital video disc read by the optical signal reading means; A second step of intermittently selecting a main video base frame (I frame) and sub-picture data from the temporarily stored data in response to a requested double speed upon request of double speed playback; A third step of decoding the selected base frame and the sub picture data, respectively, and converting them into an image signal; And a fourth step of synthesizing each of the converted video signals and outputting the synthesized output signal, thereby allowing a user to perform a screen search by the sub picture video without the hassle caused by the repetitive key operation at normal and double speed. Therefore, this invention is a useful invention for improving the convenience of video search of a DVD.

Description

Double speed playback method of digital video disc

The present invention relates to a double speed playback method of a digital video disc. More specifically, the present invention relates to a method of double speed playback of a digital video disc. By intermittently selecting and decoding the base frame (I frame) and corresponding subpicture data according to the user's requested speed, the user can search the screen while acquiring not only the main video but also subpicture information during double speed playback. The present invention relates to a double speed playback method of a digital video disc.

Fig. 1 is a general configuration diagram of a digital video disc reproducing apparatus, which includes a pickup section 11 for detecting a recording signal from the surface of a DVD 10; A drive unit 13 driving the pickup unit 11 and the motor M; An R / F unit 12 for filtering the signal detected by the pickup unit 11; From the tracking error (TE) and the focus error (FE) signal of the pickup section 11 and the rotational speed of the DVD 10, the drive of the drive unit 13 is controlled, and the R / F section 12 A servo unit 20 for detecting synchronization of an output signal; A digital signal processor (30) for restoring the signal read out by the R / F unit (12) to the digital signal and restoring the original compressed video data using the detected synchronization; A buffer 40 for temporarily storing the restored video compression data; A microcomputer 50 for controlling the separate reading of the main picture data, the corresponding sub picture data, and the audio data among the temporarily stored data; And a video decoder 61, a subpicture decoder 62, an audio decoder 63, which decodes the separated main input data, the subpicture data, and the audio data into a video and an audio signal, respectively. And an amplifier decoder 60 composed of a synthesizer 64 for synthesizing the output main image and the sub picture image.

In the digital video disc playback apparatus configured as described above, the pickup section 11 detects a recording signal on the DVD 10 in response to a user's playback request, and the high frequency signal detected from the pickup section 11 is After filtering the R / F unit 12, synchronization is detected by the servo unit 20, and the digital signal processing unit 30 uses the detected synchronization to extract the original signal from the filtered signal. Will restore digital data.

The microcomputer 50 temporarily stores moving picture compression data restored by the digital signal processor 30 in the buffer 40, and the main image data I (Intra) and B (Bidirectionally Predictive) from the temporarily stored data. Based on the absolute time data in the P (Predictive) frame, separate and read the main video data and corresponding audio data and sub-picture data separately recorded in each packet at the same time, and convert the same into an amplifier decoder ( And transmit to the corresponding decoder of 60). Each decoder that receives the transmitted data decodes the converted data into a video or audio signal, and the synthesizer 64 synthesizes the converted main video signal and the sub picture video signal to output the DVD 10. ) Is made.

During the normal regeneration as described above, when the user requests the double speed regeneration from the microcomputer 50, the microcomputer 50 controls the motor M through the servo unit 20 and the drive unit 13. In the data that is read out from the pickup unit 11 and temporarily stored in the buffer 40, the rotation speed of the DVD 10 is adjusted based on the user's request (3 times, 6 times, ...). Only I frames in the image data (frames encoded with only screen information, not predicted frames) are intermittently selected according to the requested double speed, and the selected I frames are transmitted to the video decoder 61 of the impact decoder 60. By decoded, double speed playback was performed according to a user's request by image skipping.

However, in the above-described digital video disc double speed playback method, since the sub picture information is not reproduced, when the user doubles the video reproduced for screen search, if the key image of the search is in the sub picture, Image retrieval is not possible, and sub picture information can be obtained only by stopping the speed play and switching to the play mode from time to time, so that the screen search by the speed play is cumbersome and unnecessary to waste time.

Accordingly, the present invention has been created to solve the above problems, and by providing a corresponding subpicture image together with the main image during double speed reproduction of a digital video disc, the screen search by double speed is made easier. It is an object of the present invention to provide a method of double speed playback of a digital video disc.

1 is a general configuration diagram of a digital video disc player;

2 is a flowchart of a double speed playback method of a digital video disc according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10: digital video disc (DVD) 11: pickup unit

12: R / F part 13: drive part

20: servo unit 30: digital signal processing unit

40: buffer 50: microcomputer

60: MPEG decoder 61: Video decoder

62: subpicture decoder 63: audio decoder

64: synthesizer

A double speed reproduction method of a digital video disc according to the present invention for achieving the above object comprises: temporarily storing recording data on a digital video disc read by an optical signal reading means in reproduction of a digital video disc (DVD); Stage 1; A second step of intermittently selecting a main video base frame (I frame) and sub-picture data from the temporarily stored data in response to a requested double speed upon request of double speed playback; A third step of decoding the selected base frame and the sub picture data, respectively, and converting them into an image signal; And a fourth step of synthesizing each of the converted video signals.

In the method of double speed playback of a digital video disc according to the present invention as described above, when the user requests double speed playback, the digital video disc is read and temporarily stored by the optical signal reading means at the time of reproduction of the digital video disc (DVD). Among the recording data, the base frame and the sub picture data of the main video are intermittently selected and decoded at a time interval proportional to the requested double speed, and the decoded base frame and the sub picture data are converted into a video signal and output to be synthesized. In this case, double speed playback is performed on the digital video disc on which the sub picture is displayed.

Best Mode for Carrying Out the Invention A preferred embodiment of the method for double speed playback of a digital video disc according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a flow chart illustrating a method of double speed playback of a digital video disc according to the present invention. Hereinafter, referring to the configuration of the digital video disc playback apparatus of FIG. 1, the speed playback method of FIG. 2 according to the present invention will be described in detail. Explain.

First, when the user requests to play the DVD 10, the DVD 10 is played through the same process as described above (S1), and the user is assigned to the microcomputer 50 while the playback is being performed. When requesting playback (S10), the microcomputer 50 of the I frame in the video data according to the user's double-speed playback (3x, 6x, ...) request from the read data temporarily stored in the buffer 40 A selection interval is specified (S11), and the I frame is selected and read out by the specified selection interval (one for every two I frames, one for every four I frames,…). In addition, the image is reproduced and output at a faster speed corresponding to the above-described operation.

The microcomputer 50 transmits the selected I frame and subpicture data to the video decoder 61 and the subpicture decoder 62 of the amplifier decoder 60, respectively, and the video decoder 61 and the subpicture decoder. 62 receives the transmitted I-frame and sub-picture data, decodes them into corresponding video signals (S13), which are then synthesized and output by the synthesizer 64 (S14), while double speed playback is performed. The sub picture is reproduced and output together with the main image, and thus screen search can be performed centering on the sub picture.

In the above-described method of double speed reproduction of a digital video disc according to the present invention, a user reproduces and outputs sub-picture data corresponding to a main picture during reproduction of a DVD at double speed. It is a useful invention that makes it possible to search a screen by a sub picture image without any hassle, thereby improving the convenience of image search of a DVD.

Claims (2)

A reproduction of a digital video disc (DVD), comprising: a first step of temporarily storing recorded data on a digital video disc read by an optical signal reading means; A second step of intermittently selecting a main video base frame (I frame) and sub-picture data from the temporarily stored data in response to a requested double speed upon request of double speed playback; A third step of decoding the selected base frame and the sub picture data, respectively, and converting them into an image signal; And a fourth step of synthesizing each of the converted video signals. The method of claim 1, wherein the sub picture data selected in the second step is data corresponding to a simultaneous point of the selected base frame.