KR20030083215A - Apparatus and method for trick play in digital broadcasting receiver - Google Patents

Abstract

PURPOSE: A device and a method for trick play in a digital broadcasting receiver are provided to carry out the forward and reverse trick play motions naturally and simplify the operation of various trick play motions by using trick play control information transmitted in program service information of transport streams. CONSTITUTION: A digital broadcasting receiver for trick play includes a demultiplexer(20), a parser(21), a buffer memory(22), a hard disc(23), a microcomputer(24), and an MPEG decoder(25). The multiplexer selects transport streams of a certain broadcasting program. The parser separates 188 byte transport packets of the selected transport streams into video/audio data and navigation data for separatively outputting the data. The buffer memory temporarily stores the video and audio data output via the parser, and stores the data to the hard disc by a predetermined recording size unit. The MPEG decoder decodes the temporarily stored video and audio data to original ones to output via a screen and speakers of a connected television. A JPEG encoder(26) carries out the JPEG type compression and encoding of images decoded by the MPEG decoder to generate JPEG compressed image files, the JPEG compressed image files being independently decoded. A JPEG decoder(27) decodes the JPEG compressed image files to restore original JPEG still images. The microcomputer controls the JPEG encoder and the JPEG decoder when a certain trick play operation is requested by a user in the procedure of restoring a broadcasting program or a data stream via MPEG decoding.

Description

Apparatus and method for trick play in digital broadcasting receiver

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trick play apparatus and method in a digital broadcast receiver, and more particularly, to receive a digital broadcast program, transmit the output to an external connection device such as a general television, and record a hard disk (HDD). The present invention relates to a trick play device and method in a digital broadcast receiver such as a set top box for recording and storing on a medium.

Recently, with the development of digital technologies such as digital image compression and digital modulation / demodulation, the standardization and commercialization of digital television broadcasting is rapidly progressing. Also, in the conventional terrestrial, satellite, and cable broadcasting, MPEG (Moving Picture Experts Group) Based on this trend, digitalization is on the rise.

On the other hand, in the digital broadcast, a plurality of broadcast programs encoded on the basis of MPEG are multiplexed and transmitted in a transport stream, and the transport stream is digital, such as a set-top box (STB) installed at a receiving side. A plurality of broadcast programs received by the broadcast receiver and included in the transport stream are demultiplexed.

Therefore, only one broadcast program desired by the user can be selected, and in a digital broadcast receiver such as the set-top box, the selected broadcast program is restored to the original audio and video signal by using an MPEG decoder provided in the receiver. After that, the output is transmitted to an A / V output device such as a general television.

Meanwhile, a large capacity hard disk (HDD) is additionally provided in a digital broadcast receiver such as the set top box, and the user can record and store a broadcast program transmitted to an A / V output device such as the television on a hard disk, and then According to the request, a digital broadcast recorder for reproducing and outputting a broadcast program recorded on the hard disk, for example, a digital broadcast receiver with an additional 'PVR (Personal Video Recorder)' function will be developed and released. It is expected, which will be described in detail below.

FIG. 1 shows a configuration of a digital broadcast receiver with a general PVR function. The digital broadcast receiver includes a demultiplexer 10, a parser 11, a buffer memory 12, a hard disk 13, and a microcomputer. 14 and MPEG decoder 15 and the like, wherein the demultiplexer 10 includes a plurality of digital broadcast programs for transporting a transport stream of any one of the multiplexed transport streams of the multiplexed program. The output will be optional.

Meanwhile, the parser 11 outputs 188 bytes of transport packets constituting the transport stream of any one broadcast program into video and audio data and navigation data. In the buffer memory 12, the video and audio data output through the parser are temporarily stored and then recorded and stored in the hard disk 13 in units of a predetermined recording size.

In addition, the MPEG decoder 15 decodes video and audio data temporarily stored in the buffer memory 12 into original video and audio data, and outputs the video and audio data through a screen and a speaker of a connected general television. The output will be displayed.

On the other hand, the transport stream, as shown in Figure 2, when viewed on the time axis, the original image (Original Image) image is compressed and encoded using the MPEG2 compression method, for example, eight original images When pictures p1 to p8 are compressed and encoded by the MPEG2 compression method, the encoding order is as follows. 'p1-> p2-> p5-> p3-> p4-> p8-> p6-> p7', in order of compression of 's1, s2, s5, s3, s4, s8, s6, s7' It is encoded as an image.

At this time, s1 and s8 corresponding to I-picture (Intra-coded Picture) can be restored to the original original image by independent decoding, but s2 corresponding to P-picture (Predictive-coded Picture) s5 depends on the previous I-picture or P-picture, and s3 and s4, which also correspond to B-pictures (Bidirectionally predictive-coded Picture), depend on the previous and subsequent I-picture or P-picture.

Accordingly, s1 and s8 corresponding to the I-picture are required to decode s2 and s5 corresponding to the P-picture, and P-picture and I- to decode s3 and s4 corresponding to the B-picture. Since s5 and s8 corresponding to the picture are required, the rest of the P-pictures and B-pictures except for the I-picture cannot be restored to the original original image image by independent decoding.

On the other hand, when decoding the s1 to s8 video encoded by the MPEG2 method through the above process to the original original image video by the MPEG decoder 15, the decoding order is the same as the encoding order 'p1' -> p2-> p5-> p3-> p4-> p8-> p6-> p7 '. As described above, the I-picture, P-picture, and B-picture are each dependent. Accordingly, decoding is performed using information of the previous or subsequent picture.

Therefore, in the MPEG decoder 15, the data stream read out from the hard disk 13 can be restored and output as original video and audio data by the decoding operation as described above.

In addition, in performing a trick-play operation requested by the user, the video and audio data stored in the hard disk 13 may be 'playback mode' or 'fast forward (FF) /'. In the case of playing back in a slow forward (SF) mode, the decoding operation for each picture is performed in the same order as the encoding order for the original image image as described above.

However, when performing trick play in 'Fast Rewind (FR) mode' or 'Slow Rewind (SR) mode', i.e. when performing trick play in the reverse direction, the original image image is encoded. If you start decoding from a B-picture or a P-picture that is not an I-picture, you must decode the P-picture and B-pictures by itself, as described above. Since it cannot be reconstructed, it is necessary to search and find the previous or subsequent I-picture or P-picture, and then decode all of the B-picture or P-picture to be decoded.

However, in the MPEG2 compression scheme, since the number of I-pictures or P-pictures is not predetermined, a frequent search or decoding operation often does not occur normally. Therefore, in a conventional digital broadcast receiver, the decoding itself is performed. There is a situation in which a method of decoding and playing back only possible I-pictures is provided.

As a result, a video played in the 'fast rewind mode' or the 'slow rewind mode' may not be smooth and the screen may be disconnected. In particular, a video compressed stream in which an I-picture is inserted every few seconds or tens of seconds In the case of, the screen is discontinuously reproduced by the interval of the I-picture, thereby failing to provide a natural image to the user.

In addition, even in the case of trick play in the forward direction, due to the limitation of the decoding processing capability of the MPEG decoder, there is a disadvantage in that the reproduction speed is limited. Furthermore, in order to increase the reproduction speed, a high performance MPEG decoder having a high processing speed must be used. There was such a problem.

Therefore, the present invention was created to solve the above-mentioned situation and problems, and in a digital broadcast receiver such as a set-top box (STB) equipped with a PVR function, a data stream or a hard disk (HDD) received through digital broadcast. By converting the data stream read from the recording medium, such as) into a still image that can be independently decoded and reconstructed, such as a JPEG image file, and compressing and storing the data stream, when the trick play request is performed, the compressed and stored still image is read out and It is an object of the present invention to provide a trick play apparatus and method in a digital broadcast receiver to allow various trick plays to be performed more naturally.

1 shows a configuration of a general digital broadcast receiver,

2 illustrates an MPEG decoding process in a general digital broadcast receiver.

3 illustrates a configuration of a digital broadcast receiver to which a trick play device and method according to the present invention are applied;

4 illustrates a JPEG encoding / decoding process in a digital broadcast receiver according to the present invention.

5 is a flowchart illustrating an operation of a trick play method in a digital broadcast receiver according to a first embodiment of the present invention.

6 is a flowchart illustrating an operation of a trick play method in a digital broadcasting receiver according to a second embodiment of the present invention.

7 illustrates JPEG image files compressed and stored according to a second embodiment of the present invention.

8 illustrates a configuration of a digital broadcast receiver to which a trick play device and method according to a third embodiment of the present invention are applied.

9 to 11 show program specification information applied to the third embodiment of the present invention.

FIG. 12 illustrates JPEG image files and trick play control information stored in association with a trick play apparatus and method according to a third embodiment of the present invention.

※ Explanation of code for main part of drawing

10,20,30: Demultiplexer 11, 21, 31: Parser

12,22,32: buffer memory 13,23,33: hard disk

14,24,34: Micom 15,25,35: MPEG decoder

26,36 JPEG encoder 27,37 JPEG decoder

38: trick play file generator 39: icon generator

According to an aspect of the present invention, there is provided a trick play method in a digital broadcast receiver comprising: decoding a data stream received through digital broadcast into original video and audio data; Encoding the decoded video data into a still image and compressing and storing the decoded video data on a recording medium; And, while outputting the decoded video and audio data, upon a trick play request. And reading, decoding and outputting the recording medium compressed and stored still image,

In addition, the trick play method in the digital broadcast receiver according to the present invention comprises the steps of: reading a data stream of digital broadcast stored in a recording medium and decoding the original video and audio data; Encoding the decoded video data into a still image and compressing and storing the decoded video data on the recording medium; And, while outputting the decoded video and audio data, upon a trick play request. And reading, decoding and outputting a still image compressed and stored on the recording medium.

In addition, the trick play apparatus in the digital broadcast receiver according to the present invention comprises: storage means for recording and storing a data stream received through digital broadcasting; Decoding means for decoding the received data stream or data stream read out from the storage means into original video and audio data; Still image encoding means for encoding the decoded video data into a still image and storing the decoded video data as a compressed image file in the storage means; Still image decoding means for decoding a compressed image file read out from the storage means into an original still image; And a trick play request while outputting video and audio data decoded by the decoding means. And control means for operationally controlling the configuration means such that the compressed image file stored in the storage means is read, decoded and output as an original still image.

Hereinafter, a preferred embodiment of a trick play apparatus and method in a digital broadcast receiver according to the present invention will be described in detail with reference to the accompanying drawings.

3 illustrates a configuration of a digital broadcast receiver to which a trick play device and method according to the present invention are applied. The digital broadcast receiver includes a demultiplexer 20 and a parser as described above with reference to FIG. 1. 21, the buffer memory 22, the hard disk 23, the microcomputer 24, and the MPEG decoder 25 may be included, and the JPEG encoder 26 and the JPEG decoder 27 may be included.

On the other hand, as described above, the demultiplexer 20 selectively outputs the transport stream of any one broadcast program among the transport streams of multiple programs multiplexed by a plurality of digital broadcast programs, and in the parser 21, The 188-byte transport packets constituting the transport stream of the broadcaster are separately output as video and audio data and navigation data. In the buffer memory 22, The video and audio data output through the parser are temporarily stored and then recorded and stored on the hard disk 23 in units of a predetermined recording size.

In addition, the MPEG decoder 25 decodes video and audio data temporarily stored in the buffer memory 22 into original video and audio data, and outputs the video and audio data through a screen and a speaker of a connected general television. In the JPEG encoder 26, as shown in FIG. 4, the image images p1 to p8 decoded by the MPEG decoder 25 are compressed and encoded by the JPEG method, and are independently output. After generating JPEG decompressed image files s'1 to s'8 which can be decoded, the recording and storing are performed on the hard disk 23.

The JPEG decoder 27 decodes the JPEG compressed image files to restore an original JPEG still image, and the microcomputer 24 performs an MPEG decoding operation on a broadcast program received through digital broadcasting. If any one trick play operation is requested from the user during restoring and outputting the data stream read out from the hard disk through MPEG decoding, the JPEG encoder and the JPEG decoder are controlled respectively. In this case, the still image of the JPEG image files is controlled to be reproduced and output.

5 is a flowchart illustrating a trick play method in the digital broadcast receiver according to the first embodiment of the present invention. For example, in the microcomputer 24, the demultiplexer 20 is operated and controlled. In the normal broadcast viewing mode in which the user tunes and receives a broadcast program of a desired broadcast channel (S10), in the MPEG decoder 25, the data stream of the tuned-received broadcast program, that is, the parser 21, is set. The video data and audio data of the transport stream temporarily stored in the buffer memory 22 are decoded by the MPEG2 method as described above with reference to FIG. 4 to restore and output the original video and audio data (S11). ).

Meanwhile, the JPEG encoder 26 converts and encodes original video data reconstructed and output through the MPEG decoder 25 into a still image of a JPEG image file (S12), and then encodes the JPEG encoded into the still image. A series of operations of recording and storing image files on the hard disk is repeatedly performed (S13).

Accordingly, in a general television connected and connected to the digital broadcast receiver, a moving picture and a sound of a broadcast program currently being received are output and displayed, and the hard disk, video data of a moving picture being output and displayed through the television, is a JPEG image. When the user requests an arbitrary trick play operation, the microcomputer 24 searches for the JPEG image file recorded on the hard disk (S15), and then the user requests a trick play operation. JPEG image files are read out according to the type of play (S16).

For example, when the user requests 'fast rewind' (FR) during fast rewinding, slow rewinding, fast forwarding, slow forwarding, and pause, the microcomputer 24, at the time of the key input, the hard disk In addition to intermittently reading JPEG image files previously recorded and stored from the JPEG image file stored in the recording, the operation is controlled by the JPEG decoder 27 to stop the intermittently read JPEG image files. The video file is reproduced and output (S17).

At this time, the microcomputer 25 stops the MPEG decoder 25 so that the output of the JPEG decoder can be selectively output to the television. For example, the 'fast rewind (FR)' When the playback speed of 'corresponds to' 3 times speed 'of the normal playback speed, the microcomputer 24 operates the buffer memory 22 to control the JPEG image files stored in the hard disk 23. The intermittent read JPEG image files are independently decoded by the JPEG decoder 27 and restored to the original still image. Through the normal output naturally.

On the other hand, when the user requests another trick play, for example, 'fast forward' while performing the above operation, the microcomputer 24, from the JPEG image file that was read at that time, is then recorded and stored. After reading the JPEG image files sequentially, the image is restored to the original still image, but the output time is maintained for a longer time than the normal playback.

That is, when 'slow forward' corresponds to '1/2 times faster' than normal playback, the output time of the restored still image is maintained twice as long as normal playback.

Therefore, the broadcast program received through digital broadcasting is decoded into original video and audio data, output to a connected television, and the decoded video data is encoded into a still image and compressed and stored on a hard disk. After, on trick play request. By reading and decoding the compressed and stored still image and outputting it to the television, it is possible to more naturally provide various trick play operations desired by the user.

6 is a flowchart illustrating a trick play method in the digital broadcast receiver according to the second embodiment of the present invention. For example, in the microcomputer 24, the buffer memory 22 is operated and controlled. The data stream corresponding to any one broadcast program desired by the user is set to a normal broadcast reproducing mode for searching and reading from the hard disk 23 (S30). In the MPEG decoder 25, the searching and reading is performed. The data stream of the broadcast program, that is, video data and audio data temporarily stored in the buffer memory 22, as described above with reference to FIG. 4, is decoded in an MPEG2 manner to restore and output original video and audio data. (S31).

On the other hand, in the JPEG encoder 26, the original video data reconstructed and output through the MPEG decoder 25 is converted and encoded into a still image of a JPEG image file (S32), and the JPEG encoded into the still image is encoded. A series of operations of recording and storing image files on the hard disk is repeatedly performed (S33).

Accordingly, in a general television connected to the digital broadcast receiver, a video and audio of a broadcast program currently being read and reproduced are output and displayed, and the video data of the video being output and displayed through the television is displayed on the hard disk. It is recorded and stored as an image file.

In this case, when the user requests any one trick play operation, the microcomputer 24 searches for the JPEG image file recorded on the hard disk (S35), and then the JPEG image according to the type of trick play requested by the user. The files are read (S36).

For example, when the user requests 'fast rewind' (FR) during fast rewinding, slow rewinding, fast forwarding, slow forwarding, and pause, the microcomputer 24, at the time of the key input, the hard disk In addition to intermittently reading JPEG image files previously recorded and stored from the JPEG image file stored in the recording, the operation is controlled by the JPEG decoder 27 to stop the intermittently read JPEG image files. The video file is reproduced and output (S37).

Therefore, the data stream read out from the hard disk is decoded into original video and audio data, output to the connected television, and the decoded video data is encoded into a still image, and then compressed and stored on the hard disk. On request, trick play. By reading and decoding the compressed and stored still image and outputting it to the television, it is possible to more naturally provide various trick play operations desired by the user.

On the other hand, in the microcomputer 24, in order to link the JPEG image files recorded and stored on the hard disk with the MPEG stream of a specific section to be selectively reproduced by the user, as shown in FIG. The playback start information (M_PB_Start) and the playback end information (M_PB_End) for the playback, the playback start information (J_PB_Start) and the playback end information (J_PB_End) for the JPEG stream may be linked to each other.

FIG. 8 illustrates a configuration of a digital broadcast receiver to which a trick play device and method according to a third embodiment of the present invention are applied. As described above with reference to FIG. 3, the digital broadcast receiver includes a demultiplexer ( 30, a parser 31, a buffer memory 32, a hard disk 33, a microcomputer 34, an MPEG decoder 35, a JPEG encoder 36, and a JPEG decoder 37, and a trick play The file generator 38 and the icon generator 39 may be included.

Meanwhile, the trick play file generation unit 38 searches for trick play control information output through the parser, generates files necessary for controlling a trick play operation, and then records and stores the files on the hard disk 33. The trick play control information, for example, program specification information (PSI) transmitted in an MPEG transport stream is transmitted. As shown in FIG. 9 and FIG. 10, the packet is transmitted in a transport packet of 188 bytes.

In this case, the 4 bytes of header information constituting the transport packet includes payload unit start indicator (PUSI) information, which is 1 bit of payload unit start indication information, and is recorded, and the 184 bytes of pay constituting the transport packet are recorded. In the load, PSI information may be included and recorded. The PSI information includes a program association table and a program map table having different unique IDs as shown in FIG. Program Map Table, Network Information Table, and Conditional Access Table information are included.

In addition, only one type of PSI table information is recorded in one transport packet (TSP), and in a case where the length of the PSI information table included in the transport packet is long, in units of one or more sections. When a section of the PSI table starts at the payload of the transport packet as described above, the one-bit PUSI information is set to '1'.

And. A packet ID (PID: Packet ID) for identifying the packet is transmitted in the program map table (PMT), and the trick play control information is based on the MPEG system as shown in FIGS. 9 and 10. Trick-play section (Trick_Play_ Section) and internally contained trick play as an example of a private section, or transmitted as information corresponding to the Digital Storage Media-Command and Control (DSM-CC) standard extended to The information is recorded and transmitted as the information of the decoder (Trick_Play_Descriptor).

Meanwhile, the trick play control information includes, for example, two-byte mode information for designating a shift reproduction control operation such as 'slow motion after rewinding' and a reproduction such as '1/2 times speed' during slow motion reproduction. Two bytes of sub mode information for specifying a speed and 10 bytes of start time and stop time information for specifying a specific playback section may be included. The time information includes a presentation time stamp (PTS) transmitted in a payload of the transport packet.

The number of repetitive reproductions for a specific recording section designated by the start time information and the end time information may be arbitrarily designated according to a user's request in the digital broadcasting receiver 30 or may be separately repeated in the shift reproduction control information. It may be additionally recorded as the reproduction count information, so that the repetitive reproduction operation can be automatically performed by the number of times.

On the other hand, the trick play file generation unit 38 searches and reads out the trick play control information additionally recorded as PSI information in the paid load of the transport packet from the MPEG transport stream of the digital broadcast, and the hard disk. The microcomputer 34 stores and associates with the MPEG stream recorded and stored at 33. In this case, the microcomputer 34 reconstructs and outputs the original video data by the MPEG decoder 35 according to the trick play control information. Video data is encoded into the JPEG image file using the JPEG encoder 36, and then stored in association with the trick play control information.

Accordingly, as shown in FIG. 12, the JPEG image files are stored in association with the trick play file, and the trick play control information recorded in the trick play file is linked to the hard disk based on the PTS time information. It is used to search and read stored JPEG image files.

The microcomputer 34 controls the icon generator 39 to generate and output icons of various shapes so that the user can easily select and designate a desired trick play control operation. When a trick play is requested from the user through the icon, the user can search for and read trick play control information corresponding to the icon to search and read JPEG image files recorded in the hard disk 33.

For example, in the microcomputer, 'Rew and Slow Motion', 'Rew and Normal Play' or 'Frame Reverse Play', and the main scene are specified. The operation of the icon generator 39 is controlled so that an icon of a shape for designating a 'highlight playback' for selecting and playing only a highlight section is superimposed on the television screen, and then an optional icon is designated and designated. The JPEG decoder 37 to selectively read out the JPEG image files recorded on the hard disk and restore the outputted JPEG image files to the original still image so that a corresponding trick play operation may be performed. To control the operation.

For example, the trick play file generation unit 38 may perform trick play mode information, submode information, start time information, and end from the PSI information output from the parser 31. It extracts Stop Time information, generates a trick play control file, and records and stores JPEG image files corresponding to the MPEG stream of the corresponding section in association with the trick play control file. At this time, the start time information and the end time information are generated based on the value of the presentation time information PTS.

That is, as shown in FIG. 12, in the mode information recorded in the m-th trick play control information (Trick Play # m), control information specifying 'slow motion after rewinding' is recorded, and in the sub-mode information And control information designating a playback speed of '1/2 times speed' may be recorded, and the JPEG image file corresponding to the playback start section and the playback end section of the slow motion may be included in the start time information and the end time information, respectively. PTS information (PTS K, PTS K + 5) can be recorded.

Therefore, when the user is watching an arbitrary digital broadcast program, when the icon of a specific shape corresponding to the 'slow motion after rewinding' is superimposed on the television screen, the user can select and designate it. In the microcomputer 306, any one of the trick play control information recorded and stored on the hard disk 303, corresponding to the icon, for example, m-th trick play control information (Trick Play # m) will be searched and read,

Thereafter, the PTS K, which is the start time information recorded in the m-th trick play control information, is read and checked, the position of the time information of the PTS K is searched, and the corresponding JPEG image files are read as the original JPEG still image. And performing a series of decoding operations for decoding. At this time, the sub mode information is checked to perform a slow motion operation of 1 / 2x speed.

Therefore, it searches for the trick play control information included in the transport stream as program specification information, converts and compresses and stores the video data of a specific section designated by the control information into a JPEG image file, and the trick play control information. After saving the record with the trick play request. By searching, reading, and decoding the compressed and stored still image and outputting it to the television, it is possible to more easily and naturally provide various trick play operations desired by the user.

As described above, preferred embodiments of the present invention are disclosed for the purpose of illustration, and the still image may be replaced by a compression method other than JPEG, and those skilled in the art will be aware of the present invention disclosed in the appended claims. Within the spirit and scope of the present invention, other various embodiments may be improved, changed, replaced or added.

The trick play apparatus and method in the digital broadcast receiver according to the present invention constituted and constructed as described above may include a data stream or a hard data stream received through a digital broadcast in a digital broadcast receiver such as a set-top box (STB) having a PVR function. After converting the data stream read from the recording medium such as a disk (HDD) into a still image that can be independently decoded and restored, such as a JPEG image file, and compressing and storing the data stream, the compressed and stored still image is transferred to the trick play upon a trick play request. By properly reading and reproducing, it is possible to perform not only the forward trick play but also various trick play operations in the reverse direction more naturally, and also by using the trick play control information transmitted as program service information (PSI) in the transport stream. Various trick play operations can be made easier Very useful inventions that are able to.

Claims (10)

Decoding a data stream received through digital broadcasting into original video and audio data; Encoding the decoded video data into a still image and compressing and storing the decoded video data on a recording medium; And While outputting the decoded video and audio data, upon a trick play request. And reading and decoding the still image stored in the recording medium, and outputting the decoded still image. Reading a data stream of a digital broadcast stored in a recording medium, and decoding the original video and audio data; Encoding the decoded video data into a still image and compressing and storing the decoded video data on the recording medium; And While outputting the decoded video and audio data, upon a trick play request. And reading, decoding, and outputting a still image compressed and stored on the recording medium, and outputting the decoded still image. The method according to claim 1 or 2, In the second step, the I-picture, the B-picture, and the P-picture of the decoded video data are encoded as JPEG still images, respectively, and stored in the recording medium as a compressed image file. How to play tricks on The method according to claim 1 or 2, The data stream includes trick play control information. In the second step, by searching and referring to the trick play control information included in the data stream, each image of a specific section of the decoded video data is encoded as a still image, and stored as a compressed image file on the recording medium. A trick play method for a digital broadcast receiver, characterized by the above-mentioned. The method of claim 4, wherein The trick play control information includes highlight information corresponding to the DSM-CC standard extended based on the MPEG system, or highlight information transmitted in the private section. . The method according to claim 3 or 4, In step 3, the compressed image file stored in the recording medium is read and decoded to perform at least one trick play operation of fast rewinding, slow rewinding, fast forwarding, slow forwarding, and pause. How to play tricks on a digital broadcast receiver. Storage means for recording and storing a data stream received through digital broadcasting; Decoding means for decoding the received data stream or data stream read out from the storage means into original video and audio data; Still image encoding means for encoding the decoded video data into a still image and storing the decoded video data as a compressed image file in the storage means; Still image decoding means for decoding a compressed image file read out from the storage means into an original still image; And When a trick play request is made while outputting video and audio data decoded by the decoding means. And control means for operationally controlling the configuration means such that the compressed image file stored in the storage means is read, decoded as an original still image, and output. The method of claim 7, wherein The still image encoding means digitally encodes the I-picture, the B-picture, and the P-picture of the decoded video data into JPEG still images, and stores the compressed image file in the storage means as a compressed image file. Trick play device in a broadcast receiver. The method of claim 7, wherein The control means, according to the user key input, characterized in that the operation control the configuration means to perform at least one trick play operation of the fast rewind, slow rewind, fast forward, slow forward, pause Trick play device in digital broadcast receiver. The method of claim 7, wherein The control means may search for and refer to trick play control information included in the data stream, and, among the decoded video data, only I-picture, B-picture, and P-picture of a specific section designated by the control information. And encoding each of the JPEG still images after encoding the same, and storing the compressed image file in the storage unit as a compressed image file.