KR20010068576A - Method for recording reproduction speed management information and reproducing by using the information - Google Patents

Abstract

PURPOSE: A variable speed regeneration management information generating recording method and variable speed regeneration method is provided to search screen without vexation due to key operation by regenerating and outputting a text data for audio corresponding to main picture when a variable speed regeneration. CONSTITUTION: A picture from an input signal and a flash data besides the picture to be regenerated and interlocked with this are made an encoding separately in the first stage. A basis picture data is abstracted from the data to be made an encoding in the second stage. It is confirmed whether a data having other characteristic exists or not to be regenerated and interlocked with the basis picture data abstracted in the third stage. A designated information is regenerated and recorded as information for a variable speed regeneration according to result of confirmation in the fourth stage.

Description

Method for recording reproduction speed management information and reproducing by using the information}

The present invention relates to a method of generating and recording management information for shift reproduction of a digital data stream and performing shift reproduction through the management information recorded as described above.

FIG. 1 is a block diagram of a general recordable digital multi-function disk drive (DVD-RAM, hereinafter referred to as a " recording disc ") drive. An amplifier 10 for encoding input digital video and audio data using a predetermined MPEG method is shown in FIG. ); A digital recording signal processing unit (20) for adding an error correction code (ECC) or the like to the encoded digital data stream to convert it into a recording format; A channel bit encoder (30) for reconverting the data converted into the recording format into a bitstream; An optical driver 31 for outputting a light quantity driving signal according to an input signal; An optical pickup (40) for recording a signal on a recording disk (1) in accordance with the light quantity driving signal and for detecting a recording signal from a recording surface; An R / F unit 50 for filtering the signal detected by the optical pickup 40 and outputting it as a binary signal; A spindle motor 2 for rotating the recording disc 1; A sled motor 41 for horizontally moving the optical pickup 40; A drive unit 61 for driving the spindle motor 2 and the sled motor 41; A servo unit 60 controlling the driving of the drive unit 61 from the tracking error (T.E) and focus error (F.E) signals of the optical pickup 40 and the rotational speed of the recording disc 1; A digital reproduction signal processing unit (21) for restoring the binary signal to the original compressed video data with its clock synchronized with the binary signal; A buffer 71 for temporarily storing the restored moving picture compressed data; A microcomputer 70 for controlling the separate reading of the main image data, the corresponding sub picture data, and the audio data among the temporarily stored data; And a video decoder 81, a subpicture decoder 82, an audio decoder 83, which decodes the separated main input data, the subpicture data, and the audio data into a video and an audio signal. And an amplifier decoder 80 composed of a synthesizer 84 for synthesizing and outputting the output main video and sub-picture video.

In the recording disk driving apparatus configured as described above, the amplifier encoder 10 first encodes video data input from the outside and audio data corresponding thereto in a predetermined manner, and generates navigation data, as shown in FIG. Outputs a digital data stream, and the digital recording signal processing unit 20 adds an error correction parity to the encoded data for reliability of recording / reproducing the input digital data. ), And so on. The channel bit encoder 30 converts the digital bitstream output from the digital recording signal processing unit 20 into a pulse width modulated signal form for recording on the recording disk 1 and applies the signal to the optical driver 31. do.

The microcomputer 70 controls the optical driver 31 to output a recording signal by an optimal optical driving current, and the optical driver 31 outputs a signal by the optical driving power according to the optical pickup. By applying a pulse width modulated signal to the program area of the recording disk 1 by applying it to 40, the digital data stream as shown in FIG. 2 is recorded on the recording disk 1 as a VOBU (Video Object Unit). It is recorded in units.

As described above, when the digital data is recorded on the recording disk 1, or when a disk on which a digital image having a format as shown in FIG. 2 is recorded is inserted and a user requests playback, the microcomputer 70 is inserted and seated. By applying a drive voltage corresponding to an appropriate regeneration shift of the recording disc 1 to the spindle motor 2 through the servo unit 60 and the drive unit 61, the recording disc 1 is rotated and driven. The high frequency reproduction signal read out and reproduced from the rotationally driven recording disc 1 by the optical pickup 40 is filtered by the R / F unit 50 and then filtered by the digital reproduction signal processing unit 21. The original digital data is restored.

The reconstructed digital data is composed of video, audio and subpicture pack data, and navigation pack data, and the dual video, audio and subpicture data are separately stored for each type and temporarily stored in the buffer 71. Navigation data among the data is stored in the microcomputer 70 itself.

Subsequently, the microcomputer 70 includes, among the temporarily stored data, an absolute part in the video (main image) data including I (Intra), B (Bidirectionally Predictive), and P (Predictive) frame (picture) as shown in FIG. Based on the visual data, the main image data separately recorded in each packet, and the corresponding audio and subpicture data are separately read out at the same time and transmitted to the corresponding decoder of the amplifier decoder 80, respectively. Receiving the transmitted data, each decoder (81, 82, 83) is decoded and converted into a video or audio signal, and the synthesizer 84 is converted to the main video signal and the sub-picture video signal By synthesizing the output, the recording disk 1 is reproduced.

During normal regeneration as described above, when the user requests the shift regeneration from the microcomputer 70, the microcomputer 70 controls the motor M through the servo unit 60 and the drive unit 61. The rotation speed of the recording disc 1 is adjusted based on the shift (3 shifts, 6 shifts, ...) requested by the user, and is read from the optical pickup 40 and temporarily stored in the buffer 71. In the data, only I pictures (frames encoded with only screen information, not predicted frames) in the main image data are intermittently selected according to the requested shift. Thus, only I pictures in the main image data can be selected. As shown in Fig. 2, the data search information (DSI) field area in the navigation pack data manages position information of an I picture to be reproduced according to each shift so that an I picture can be selected based on this position information. The.

The microcomputer 70 transmits only the selected I picture to the video decoder 81 of the amplifier decoder 80 so as to be decoded, and the audio pack is not decoded. To perform the variable speed regeneration.

However, in the shift reproducing method of the recording disc made as described above, when the user wants to listen to the specific audio again and wants to search for the portion by the shift regeneration, the shift regeneration is made of only the image except the audio as described above. Because of this, it is very difficult to accurately search and rehearse the audio of a specific part desired by the variable speed reproduction. In particular, it is very cumbersome and time consuming to search for a video section that outputs the desired audio in a part where there is little change in the video such as news. Therefore, the user should stop the shift playback from time to time and switch to the playback mode to check the audio of the currently played part and repeat this process until the desired part is found.

Therefore, the present invention was created to solve the above problems, and provides information on the corresponding audio along with the main image when shifting and reproducing the digital recording medium, thereby making screen searching by shifting easier. It is an object of the present invention to provide a method of generating and regenerating shift reproduction management information and a shift reproduction method.

1 shows a configuration of a general disc recording medium driving apparatus,

Fig. 2 shows the format of video recording data of a digital multifunction disc (DVD)

Fig. 3 shows the structure of a recording disc drive device in which a speed change reproduction management information generation recording method and a speed change reproduction method according to the present invention are implemented.

4 is a flowchart showing the flow of a preferred embodiment of the shift regeneration method according to the present invention;

5 shows a data recording format of a recording medium according to the present invention;

Fig. 6 shows the form of the entry information (VOBU_ENT) of the recording unit which is the recording format of the disc recording medium.

※ Explanation of code for main part of drawing

1: Recordable digital multi-function disc (DVD-RAM)

2: Spindle Motor

10, 100: amplifier encoder 20: digital recording signal processing unit

21: digital reproduction signal processor 30: channel bit encoder

31: optical driver 40: optical pickup

41: sled motor 50: R / F part

60: servo unit 61: drive unit

70, 700: Micom 71: Buffer

80: Amp decoder 81: Video decoder

82: subpicture decoder 83: audio decoder

84: synthesizer

According to another aspect of the present invention, there is provided a variable speed reproduction management information generation recording method comprising: a first step of encoding each of attribute data other than an image to be reproduced in association with an image from an input signal; A second step of extracting base image data from the encoded data; A third step of confirming whether data of the other attribute to be reproduced is linked with the extracted base image data; And a fourth step of generating and recording the predetermined management information as the information for the speed change reproduction according to the confirmation result.

In addition, the shift playback method according to the present invention, the first step of checking the position information of the base image data for discrete playback, when the shift playback command input; A second step of checking whether there exists attribute data other than the image to be reproduced in association with the base image data from the checked position information; And a third step of determining the amount of data to be decoded for display on a single screen according to the presence or absence confirmation result.

Hereinafter, an embodiment of a shift regeneration management information generation recording method and a shift regeneration method according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a diagram illustrating a configuration of a recording disk driving apparatus in which a shift reproducing management information generation recording method and a shift reproducing method according to the present invention are implemented, and are the same as those of FIG. 1 described above, but with only the amplifier encoder 100 and the microcomputer. The operation of 700 is partly different.

4 is a flow chart showing the flow of a preferred embodiment of the shift regeneration method according to the present invention. Hereinafter, the regeneration method of FIG. 4 according to the present invention will be described in detail with reference to the configuration of the driving apparatus of FIG.

First, the amplifier encoder 100 encodes video and audio data input under the control of the microcomputer 700. In this case, the amplifier encoder 100 has audio data corresponding to the encoded video data. Encoding text data having time information input or linked thereto at the time of encoding the audio data so as to be continuously outputted with the base image data (I picture) constituting the video data as shown in FIG. 5. . The amplifier encoder 100 also records a flag indicating that text data to be reproduced in association with the base image data is recorded when the base image data is reproduced, and also in the recording unit entry information (VOBU_ENT) area. As in 6, flag recording fields b23 and b22 of the upper two bytes are allocated, and a value indicating that there is text data to be reproduced in association with the flag recording field is written. For example, if b23 b22 = 00, there is no text data, if 01, there is text data, and other values indicate that data to be interlocked and reproduced according to the attribute is recorded.

In addition to indicating that the audio text is recorded as the flag information as described above, the size information of the encoded base image and the audio text data is recorded as the size information of the I picture. In the recording unit entry information (VOBU_ENT) area, as shown in Fig. 6, there is a size information field (1STREF_SZ) for the I picture, and the size of the text data to be reproduced at the time of shifting together with the I picture is summed with the I picture size. By recording, even during shifting, text data for audio is also recognized as part of the I picture and reproduced together with I picture reproduction.

As described above, instead of summing up the audio text size as the encoded size, the encoding size of the audio text may be fixed according to a system specification. For example, the encoding size of the audio text is fixed to 200 kbytes, and the amplifier encoder 100 may fill and record null data with a size of 200 kbytes regardless of the size when encoding the audio text. At this time, whether to decode an additional 200 kbytes in addition to the I picture data is determined depending on whether the flag is set at the time of reproduction.

As described above, the encoded digital data stream of FIG. 5 is recorded in the VOBU unit which is an image recording unit on the recording disc 1 through the above-described process, and the reproduction management information which is entry information of the recording unit is It is recorded on the management information area corresponding to VOBU.

When the recording disk 1 having data recorded as described above is inserted or seated or a disk recording medium having audio text continuously recorded with the base image data in the above-described recording form is inserted and seated and played back (S10, S20), the microcomputer The operation 700 is performed in the same manner as described above (S21), and if the shift reproduction is performed at the request of the user (S30), the microcomputer 700 is read from the optical pickup 40 (S31). In the digital data temporarily stored in the buffer 71, the I picture is intermittently selected according to the requested shift based on the position information of the I picture recorded in the DSI field in the navigation pack data as described above. At this time, the microcomputer 700 checks the position of the text data to be reproduced in association with the I picture from the I picture size information in the corresponding recording unit entry information, or checks the flag value on the flag recording field and the audio text is the I picture. In step S32, if the existence of the text data is confirmed, subsequent text data of the specified size is continuously decoded and outputted after decoding the I-picture data or the flag is checked. If not, the data is decoded and outputted from the start of the base frame by the data having the size added up to the size of the audio text data to the size information (S33).

In this way, the speed change reproduction is performed according to the user's request by the video skip, so that the user can watch the main image together with the text data representing the corresponding audio content on the screen.

The shift regeneration management information generation recording method and the shift regeneration method according to the present invention as described above reproduces and outputs text data for audio corresponding thereto together with a main image during shift reproduction of a recording disc, thereby allowing a user to perform normal and shift operations. It is a useful invention that makes it possible to screen search the desired audio output section from the subtitle image by text data without the hassle caused by repetitive key manipulation of the text data, thereby making language learning using a recording disc convenient.

Claims (9)

A first step of encoding each of attribute data other than the image to be reproduced in association with the image from the input signal; A second step of extracting base image data from the encoded data; A third step of confirming whether data of the other attribute to be reproduced is linked with the extracted base image data; And And a fourth step of generating and recording the predetermined management information as information for shift reproduction according to the result of the confirmation. The method of claim 1, And the predetermined management information is information indicating whether data of the other attribute to be linked with the base image data exists. The method of claim 1, And the predetermined management information is size information of the base image data and the data of the other attribute. The method of claim 1, And in the fourth step, recording the predetermined management information into a management information area corresponding to a recording unit divided into the base image data units. A first step of checking position information of the base image data for discrete reproduction when a shift reproduction command is input; A second step of checking whether there exists attribute data other than the image to be reproduced in association with the base image data from the checked position information; And And a third step of determining the amount of data to be decoded for display on a single screen, in accordance with the existence check result. The method of claim 5, And the confirmation of the second step is performed based on predetermined information recorded in a management information area corresponding to a recording unit divided into base image data units. The method of claim 5, The third step is to determine whether or not to reproduce the data of the other attribute in addition to the base image data according to the existence check result. A first step of checking position information of the base image data for discrete reproduction when a shift reproduction command is input; A second step of confirming existence of character data to be reproduced in association with the base image data from the checked position information; And And a third step of determining a unit section for discrete regeneration according to the existence existence result. The method of claim 8, And the confirmation of the second step is performed based on predetermined information recorded in a management information area corresponding to a recording unit divided into base image data units.