KR20010053813A - Data recording medium and data reproducing method - Google Patents

Abstract

PURPOSE: A data recording medium and a data reproducing method are provided to record data in file structure to feedback to a specific frame of an original file in performing a trick mode. CONSTITUTION: A control unit receives a data recording command from a remote controller. The control unit records a digital video stream outputted from a broadcasting signal receive unit on an HDD(Hard Disk Drive) in a random access recording unit. After completing the record, the control unit detects input of a normal reproducing command. Then, the control unit reproduces the data. In case of input of a trick mode select command, a data is reproduced from a trick mode file. Herein, the track mode file is located in an I-frame near the reproduced data frame. By input of a normal reproducing command, the control unit reproduces the data in an original file. Herein, the original file is located in the I-frame reproduced in the trick mode file.

Description

DATA RECORDING MEDIUM AND DATA REPRODUCING METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file structure of a digital video storage device, and more particularly, to a data recording medium in which data is recorded in a file structure for feeding back to a specific frame of an original file during a trick mode, and a data reproducing method of a digital video storage device using the same. It is about.

As an example of a digital video storage device, a broadcast receiving system capable of simultaneously recording broadcast signals input through a plurality of channels to a recording medium and reproducing a broadcast signal being recorded through one channel in real time. Such a broadcast receiving system employs a hard disk drive as an auxiliary memory device because the hard disk drive is randomly accessible, and the data transfer capacity is high and the data storage capacity can be increased.

In such a broadcast receiving system having a hard disk drive, trick modes such as fast forward, fast reverse, slow forward, slow reverse, and time search are performed. It has a file structure for running (trick mode). In order to distinguish such a file from an original file, the following description will be defined as a "trick mode support file", and a normal video file recorded on a hard disk surface for a relatively normal play will be described as "original file." To be defined.

Hereinafter, a detailed format of an original file and a trick mode support file in a broadcast receiving system that compresses a broadcast signal input based on an MPEG standard and records the same on a hard disk will be described with reference to FIG. 1.

First, Figure 1 illustrates the format of the original file (a) and the trick mode support file (b) stored in the recording medium. In FIG. 1, (a) shows a video file, that is, an original file, for playback at a normal speed. The original file (a) is divided into a plurality of blocks, and it is preferable to set the original file (a) to be aligned with sectors constituting tracks arranged concentrically on the hard disk surface. In the following description, it is assumed that two GOP data groups form one block, and each GOP data group is composed of one I frame and a plurality of B and P frames, as shown in (b). At the head of the group, there is a header section in which sync codes, index information, and the like are recorded.

Meanwhile, the trick mode support file also includes a plurality of blocks. Each block includes a section in which index information is recorded and a data frame section in which a plurality of I frame information is recorded, as shown in FIG. At this time, the index information is composed of offset information indicating the degree to which the I frames constituting one block are offset from the reference position (block head) as shown in (d).

Therefore, when the trick mode is performed in the broadcast receiving system having the file structure as described above, fast forward playback or fast backward playback is performed based on the trick mode support file (c). However, if the user wants to watch in the normal playback mode after the desired scene while performing the trick mode, the current file structure cannot play the original file a from the desired point. This is because the trick mode support file (c) does not include location information for feeding back to the original file (a).

Accordingly, an object of the present invention is to provide a data recording medium in which data is recorded in a file structure capable of feeding back a specific frame of an original file while performing a trick mode.

It is still another object of the present invention to provide a data recording medium and a method for reproducing recorded data such that normal playback is performed from a frame being reproduced at the time of mode switching, when switching from trick mode to normal playback mode.

In order to achieve the above object, the present invention records a video stream composed of data groups having header information inserted at the head of a plurality of data frames as an original file for reproducing in a normal mode, and performs a trick mode in each data group. And extracting only the data frames necessary to support the data stream and inserting the original file location information of each extracted data frame into a data recording medium as a trick mode supporting file.

In addition, the present invention provides a source file comprising a plurality of data frames constitute a data group and a plurality of the data groups constitute a video stream, at least data frames for trick mode support, and source file location information of each data frame. A data playback method of a digital video storage device which records an included video stream as a file for trick mode support.

A first step of accessing a video stream constituting the trick mode support file and playing data when a trick mode execution command is input;

When the normal play mode execution command is input during the trick mode, a second process of searching for the data frame being reproduced at the time of mode switching in the original file and reproducing data thereafter is performed.

1 is an exemplary view of a format of an original file (a) and a trick mode support file (b) stored in a recording medium.

2 is a block diagram of a broadcast receiving system as an example of a digital video storage device according to an embodiment of the present invention;

3 is an exemplary format of a trick mode support file for feeding back an original file while performing a trick mode according to an exemplary embodiment of the present invention.

4 is a data reproduction control flowchart according to an embodiment of the present invention.

Hereinafter, a data recording medium and a data reproducing method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a broadcast receiving system as an example of a digital video storage device according to an exemplary embodiment of the present invention. Referring to FIG. 2, the broadcast signal receiving unit 10 includes an RF tuner 12 for receiving a digital broadcast signal input from the outside and a plurality of RF tuners 14 and 16 for receiving an analog broadcast signal input from the outside. And a plurality of video compressors 18, 20 and 22 for converting and compressing analog signals input through the plurality of RF tuners 14 and 16 into digital signals.

The random access storage device 30 records and stores the digital video stream input from the broadcast signal receiving unit 10 under the control of the controller 40 on the hard disk surface of the recording medium as an original file and a trick mode support file. The video stream is read and output to the video reconstruction unit 50. The random access storage device 30 described above includes a dual port RAM 32 for temporarily storing the digital video stream, a hard disk (s) for permanently storing the digital video stream, and a drive, as is already known. And an expansion unit for expanding the HDD control unit and the hard disk drive (HDD) for controlling the operation of the drive. The extension refers to the IEEE 1394 interface.

The video recovery unit 50 restores the video stream output from the random access storage device 30 to the original signal through the system bus and outputs the original signal to the television receiver 90.

The controller 40 is a ROM for storing control program data for controlling the random access storage device 30 and the broadcast signal receiving unit 10, and a RAM for temporarily storing data generated during a control operation. And a memory configured. The controller 40 controls the overall operation of the system based on the control program. For example, the control unit 40 accesses the video stream constituting the original file when the normal play mode execution command is input and plays the data, and accesses the video stream constituting the trick mode support file when the trick mode execution command is input. Data playback. In addition, when a normal play mode execution command is input again while playing a file for trick mode support, the original file is fed back to the original file to play the original file from the data frame being played.

The remote controller 60 includes a plurality of control keys for system control, and generates and outputs data according to the operation of the control key to the controller 40. The plurality of adjustment keys comprise a plurality of adjustment keys for pausing, rewinding, normal playback, and trick mode.

The computer connection unit 70 interfaces signals transmitted and received between the broadcast receiving system and the computer according to an embodiment of the present invention, and the time checker 80 notifies time information so that the broadcast receiving system can perform automatic recording. .

Hereinafter, an original file and a file for trick mode support according to an embodiment of the present invention will be described.

3 is a diagram illustrating a format of a trick mode support file according to an embodiment of the present invention. In Figure 3 (a) shows a trick mode support file. The trick mode support file (a) is composed of data frames (I frames) necessary to support the trick mode and one or more indexes according to the size of the data frames. Data frames (I frames) necessary to support the trick mode are extracted from the original file shown in FIG. That is, the trick mode support file (a) consists of blocks in which a plurality of data frames are composed of one block and index information is recorded at the head of each divided block. The index information is composed of offset information, block number, and frame number for each data frame, as shown in FIG. The offset information is a value indicating the degree to which the I frame is offset from the head of the index section, and the block number is a value indicating the number of the data block to which the I frame belongs in the original file. Is a value indicating the frame number in the data block. The block number may be replaced with a GOP data group number. The block number (or data group number) and the frame number are original file position information of the data frame. As another embodiment of the present invention, the block number (or data group number) and the frame number may be located at the head of the corresponding data frame as shown in FIG. have. In this case, only the offset information of each data frame is recorded in the index section.

Hereinafter, a data reproducing method will be described with reference to FIG. 4 when reproducing a recording medium in which an original file as shown in FIG. 1A and a trick mode support file as shown in FIG. 3A are recorded.

4 shows a data reproduction control flowchart according to an embodiment of the present invention. Referring to FIG. 4, when the data recording command is input through the remote controller 60 in step 100, the control unit 40 proceeds to step 110 and randomly stores the digital video stream output from the broadcast signal receiving unit 10. Recording is carried out on the HDD 34 in 30. At this time, the recorded digital video stream is recorded and stored as an original file having a format as shown in FIG. 1A and a trick mode support file having a format as shown in FIG. Thereafter, when the recording operation is terminated under the control of the user, the controller 40 checks whether a normal playback command is input in step 120. If the normal playback command is input as a result of the test, the controller 40 proceeds to step 130 to play data from the initial position of the original file or a specific data frame designated by the user. If it is determined in step 140 that the trick mode selection command is input while reproducing the data in the normal mode, the controller 40 proceeds to step 150 to play the data from the trick mode support file. At this time, the position of the trick mode support file to be started is the I frame closest to the data frame being played back from the original file. Therefore, the controller 40 plays the trick mode support file from the searched I frame in step 150.

On the other hand, if a normal play command is input in step 160 while playing a file for trick mode support, the controller 40 proceeds to step 170 and feeds back the original file to play the data. At this time, the position of the original file from which data is started is played from the I frame that was being played in the trick mode support file. That is, in the trick mode to the normal playback mode, the control unit 40 returns to the original file based on the original file position information recorded at the beginning of the I frame being played at the time of mode switching or at the beginning of the block to which the I frame belongs. Feedback. Accordingly, the original file can be normally played back from the I frame that was being played at the time of mode switching.

As described above, the present invention inserts original file position information of data frames constituting the trick mode support file into the index section or the head of the data frame, thereby reproducing or tricking the original file from the data frame being reproduced at the time of mode switching. The file for mode support can be played.

On the other hand, terms used herein are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a person skilled in the art and the definitions should be made based on the contents throughout the present application. .

In addition, although specific embodiments of the present invention have been described and illustrated, it is obvious that the present invention can be variously modified by those skilled in the art. And since the present invention has been described in the present invention through a preferred embodiment of the present invention, when considering the technical difficulty aspects of the present invention, those skilled in the art can easily be modified to another embodiment and other embodiments of the present invention As can be added, it will be apparent that all embodiments and modifications cited in the above description belong to the appended claims.

As described above, the present invention configures a trick mode support file by inserting original file position information of data frames at an index section or the head of the data frame, thereby allowing normal or trick mode playback to be performed from a data frame being reproduced at the time of mode switching. There is an advantage that can be achieved.

Claims (8)

Records a video stream composed of data groups having header information inserted at the head of a plurality of data frames as an original file for reproduction in a normal mode, and only data frames necessary for supporting a trick mode in each data group. A data recording medium in which a video stream composed of extracted and inserted source file location information of each extracted data frame is recorded as a trick mode support file. 2. The data recording medium of claim 1, wherein the original file position information is recorded in an index section located at the head of each group consisting of a plurality of extracted data frames. The method of claim 2, wherein the index period; Offset information indicating the degree to which the corresponding data frame is offset from the head of the index section, data group position information to which the data frame belongs in the original file, and frame position information in the data group are recorded. Data recording medium. Data groups in which header information is inserted at the head of a plurality of data frames are composed of one data block, and a video stream composed of these data blocks is recorded as an original file for reproducing in a normal mode, and the trick is performed in each of the data blocks. A data recording medium in which a video stream configured by extracting only data frames necessary for supporting a mode and inserting original file position information of each extracted data frame at the head of the corresponding data frames is recorded as a trick mode supporting file. The method of claim 4, wherein the source file location information comprises: And a data block number to which the data frame belongs in the original file, and a frame number in the data block. A video stream comprising a source file in which a plurality of data frames constitute one data group and the plurality of data groups constitute a video stream, at least data frames for trick mode support, and source file location information of each data frame. In the method of reproducing data of a digital video storage device recording a file as a trick mode support file, A first step of accessing a video stream constituting the trick mode support file and playing data when a trick mode execution command is input; And a second process of searching for the data frame being reproduced at the time of mode switching from the original file and reproducing data thereafter when a normal play mode execution command is input during the trick mode. 7. The method of claim 6, wherein the original file position information is recorded at the head of the corresponding data frame, respectively. 8. The method of claim 7, wherein the original file position information comprises a data group number and a data frame number of the original file.