KR100480164B1 - Variable speed reproducible optical disc recording device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable speed reproducible optical disc recording apparatus capable of shifting and reproducing digital broadcast signals on an optical disc.

The variable speed reproducible optical disc recording device comprises a tuning means for tuning a transport stream for restoring a transport stream in which a plurality of video packets for a plurality of video programs are alternately arranged in time from a high frequency signal, and a transport stream from the tuning means. First recording means for recording on an optical disc, reference signal detection means for detecting positional information of a video signal as a reference for at least two or more video programs of a transport stream recorded by the first recording means, and a reference signal detection signal And second recording means for recording the positional information of the reference video signal detected by the data into a specific area of the optical disc.

The optical disc recording apparatus having such a configuration selectively records only the video signals stored in the storage area on the optical disc corresponding to the shift reproducing information by recording the positional information in which reference video signals are recorded in a specific area of the optical disc as the information for the speed reproducing. Let it play As a result, the optical disc recording apparatus can shift and reproduce digital broadcast signals recorded on the optical disc.

Description

Variable speed recordable optical disc recording device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording apparatus for optically accessing an optical disc, and more particularly, to an optical disc recording apparatus capable of recording a digital broadcast signal on an optical disc in a variable speed.

Recently, a digital broadcasting station that has started broadcasting compresses a plurality of video programs and transmits the compressed video programs through one broadcast channel having a constant bandwidth. In other words, the digital broadcasting station divides one broadcast channel in time and transmits different video programs in the form of packets in each of the divided time intervals. Accordingly, a plurality of video signal packets multiplexed in time are repeatedly loaded on one broadcast channel. A continuous stream of such video signal packets is called a transport stream, and each video signal packet is a picture group composed of one reference picture and a plurality of predictive pictures reconstructed from the reference picture. The video packets for the video program multiplexed in the transport stream are then scrambled to minimize the occurrence of errors. Accordingly, the digital broadcast receiver must descramble the video packets included in the transport stream to distinguish the picture signals included in the video packets.

A digital video cassette recorder (hereinafter referred to as "DVCR") is used as a recording apparatus for recording a transport stream broadcasted by a digital broadcasting station on a recording medium. This DVCR records a video program multiplexed packet-by-packet into a transport stream on a digital video cassette tape as it is scrambled, and reproduces the scrambled transport stream as it is from the digital video cassette tape. For this reason, it is difficult for the DVCR to shift-play any video program recorded on a digital video cassette tape. The problem of this DVCR will be described in detail with reference to FIG.

1 schematically shows a digital broadcast receiver to which a DVCR 22 has been added. In FIG. 1, the digital broadcast receiver includes a tuner 10 connected in series between the input line 11 and the television receiver 20, a transmission decoder 12, a descrambler 14, A decoder 16 and a digital-analog (hereinafter referred to as "DA") converter 18 are provided. The digital broadcast receiver includes a repeater 24 for relaying the DVCR 22, the tuner 10, and the descrambler 14.

The DVCR 22 stores the scrambled data packet inputted from the transmission decoder 12 via the repeater 24 as it is to information tracks arranged side by side in the longitudinal direction of the digital video cassette tape as shown in FIG. Record it. The DVCR 22 reproduces the scrambled data packet from the information tracks as it is, and supplies the reproduced transport stream to the descrambler 14 via the repeater 24. On the other hand, the descrambler 14 descrambles the reproduced transport stream in time to generate a data stream for the video program, and supplies the data stream to the video / audio decoder 16. The video / audio decoder 16 then decodes the data stream from the descrambler 14 according to a decompression algorithm (e.g., an MPEG decompression algorithm) to reconstruct the digital video and audio data.

In contrast, the DVCR 22 reproduces a non-recoverable data packet by the Hyde partially scanning the information track of the digital video cassette tape during shift playback. Because of this, the video / audio decoder 16 cannot recover digital video and audio data from the output signal of the descrambler 14.

In order to solve such a structural problem, a conventional method of recording a reference video signal in areas of an information track to be scanned in a head has been proposed for a DVCR having a variable speed reproduction function. However, this method requires rewriting for data shift reproduction for the same image, thereby reducing the tape's use efficiency.

Hanfun, a Digital Video Disc Recorder (hereinafter referred to as "DVDR") has recently been in the spotlight as a drive for recording media as the development of a rewritable optical disc is completed. And DVDR has been used to record video signals due to the large capacity of optical discs. However, the DVDR has not yet been developed to allow variable speed reproduction of video information recorded on an optical disc.

Accordingly, an object of the present invention is to provide a variable speed reproducible optical disc recording apparatus capable of recording a digital broadcast signal on an optical disc in a variable speed reproduction.

In order to achieve the above object, the variable speed reproducible optical disc recording apparatus according to the present invention tunes a transport stream for recovering a transport stream in which a plurality of video packets for a plurality of video programs are alternately arranged in time from a high frequency signal. Position information of a video signal as a reference for at least two or more video programs of the tuning means, the first recording means for recording the transport stream from the tuning means on the optical disc, and the transport stream recorded by the first recording means. And reference recording means for detecting, and second recording means for recording the positional information of the reference video signal detected by the reference signal detecting signal in a specific area of the optical disc.

The variable speed reproducible optical disc recording apparatus according to the present invention comprises a tuning means for tuning a transport stream in which a plurality of video packets for a plurality of video programs are alternately arranged in time from a high frequency signal, and from a transport stream from the tuning means. Transmission decoding means for extracting data portions for a video program, descrambling means for descrambling the data portions from the transmission decoding means, restoring a data stream, address generating means for generating a write address, and descrambling means. First recording means for recording the data stream from the disc and the data stream from the descrambling means to detect the position information of the reference video signals of the data portions recorded on the optical disc and store the detected position information in the memory. that And the second recording means for recording the position information of the reference video signals stored in the memory on the optical disc.

Other objects and advantages of the present invention in addition to the above objects will become apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 4 and 5.

4 illustrates a digital broadcast receiver to which a variable speed reproducible optical disc recording / reproducing apparatus according to an exemplary embodiment of the present invention is applied. In FIG. 4, the digital broadcast receiver comprises a tuner 28, a transmission decoder 30, a descrambler 32, a video / audio decoder 34 connected in series between the input line 31 and the output line 37. And a DA converter 36. The tuner 28 tunes the transport stream included in the specific frequency band from the high frequency signal from the input line 31 and supplies the tuned transport stream to the transport decoder 30. The transport decoder 30 decodes headers of video packets included in the transport stream from the tuner 28 to extract only video packets for any one of the plurality of video programs, and to the extracted video packets. The included data parts are separated and supplied to the descrambler 32 via the first node 33. In this case, each of the data units output to the first node 33 may include one reference video signal (I-video data in the case of MPEG transport stream) and a plurality of prediction video signals (B-video data in the case of MPEG transport stream). P-image data).

The descrambler 32 descrambles the data portions from the first node 33 to generate a data stream, and supplies the data stream to the video / audio decoder 34 via the second node 35. Video / audio decoder 34 decodes the data stream from second node 35 according to a decompression algorithm (e.g., an MPEG decompression algorithm) to reconstruct the digital video and audio data. Then, the DA converter 36 converts the digital video and audio data reconstructed by the video / audio decoder 34 into video and audio signals in analog form and converts the converted video and audio signals through the output line 37. Supply to a television receiver (not shown).

The digital broadcasting receiver inputs an address generator 38 for generating a recording address signal, a recording / reproducing section 40 for inputting a transport stream from the first node 33, and a data stream from the second node 35. A reference image detector 42 is further provided. The recording / reproducing section 40 adds the recording address signal generated by the address generator 38 to the data sections from the transmission decoder 30 via the first node 33 at the time of recording, and the optical disc 50 Format it as required. The recording / reproducing section 40 sequentially records the formatted signal in the data area of the optical disc 50. In contrast, during reproduction, the recording / reproducing section 40 reproduces the data sections for the video program recorded on the optical disc 50 and supplies the reproduced data sections to the descrambler 35 via the first node 33. do.

The reference image detector 42 detects a reference video signal from a data stream input from the descrambler 32 via the second node 35. The reference image detector 42 supplies a specific logic pulse signal to the shift information generator 46 whenever the reference image signal is detected. Then, the shift information generator 46 samples the write address signal from the address generator 38 each time a pulse signal of a specific logic is supplied from the reference image detector 42 and stores the sampled write address signal as the shift information. Save at 44. Then, the shift information generator 46 generates recording address signals indicating the recording position of the reference video signal stored in the memory 44 when the recording / reproducing section 40 has completed recording the transport stream. For example, the data is recorded as shift information in the TOC area.

In addition, the digital broadcast receiver further includes a controller 48 for controlling the system. The controller 48 controls the tuning operation of the tuner 28 and designates the tuning channel of the tuner 28. The controller 48 then controls the decoding operation of the transport decoder 30 and specifies the video program to be extracted by the transport decoder 30. The control unit 48 also controls the operations of the descrambler 32, the video / audio decoder 34, the D-A converter 36, the address generator 38, and the reference image detector 42. Next, the controller 48 controls the recording / reproducing operation of the recording / reproducing section 40 and the recording / reproducing position on the optical disk 50 as well as the recording operation of the shift information generator 46 and the optical disk 50 on the optical disk 50. Control recording matching. Finally, the controller 48 retrieves the shift information recorded in the specific area on the optical disc 50 via the recording / reproducing section 40 and only the reference video signals recorded on the optical disc 50 by the shift information. To be played.

FIG. 5 is a flowchart illustrating a transport stream recording process of a speed reproducible optical disc recording / reproducing apparatus according to an embodiment of the present invention, which is performed by the controller 48 shown in FIG. The flowchart of FIG. 5 will be described in detail step by step in conjunction with the digital broadcast receiver of FIG.

The controller 48 enables the address generator 38 when there is a recording request of the transport stream, and loads an initial write address value into the address generator 38 so that the address generator 38 sequentially increases the write address. Generate a signal (step 52). The controller 48 then controls the recording / playback section 40 such that the recording / playback section 40 records data sections for any video program from the transport decoder 30 on the optical disc 50 (54th). step). At this time, the recording / reproducing section 40 adds the recording address signal from the address generator 38 to the data sections from the transfer decoder (0) and the data section to which the recording address signal is added. Start writing to the data area.

After performing step 54, the controller 48 enables the descrambler 32 (step 56). The descrambler 32 then descrambles the data portions for any video program input from the transport decoder 30 via the first node 33 to restore the data stream. The descrambler 32 supplies the restored data stream to the video / audio decoder 34 and the reference picture detector 42 via the second node 35. The reference image detector 42 then monitors the data stream input from the descrambler 32 via the second node 35 to detect whether a reference video signal (e.g., I-image data) is input. In addition, the detection result is supplied to the shift information generator 46 (step 58). Subsequently, the shift information generator 46 uses the write address signal from the address generator 38 as the shift information every time a pulse signal of a specific logic indicating that the reference video signal has been input from the reference image detector 42 is input. (Step 60). At this time, the write address signals stored in the memory 44 indicate storage areas on the optical disc on which reference video signals are recorded.

Next, the controller 48 checks whether the recording end command from the user has been input or whether the specified recording time has elapsed, and determines whether recording of the data portions for which video program should be terminated (step 62). If the recording of the data portions is not the end point of recording in step 62, the controller 48 returns to step 58. In contrast, at the end of recording of the data portions, the controller 48 controls the shift information generator 46 to record the shift information in a specific area of the optical disc 50 (step 64). At this time, the shift information generator 46 records the record addresses stored in the memory 44 in the TOC area, which is a specific area of the optical disc 50, as the shift reproduction information.

As described above, the variable speed reproducible optical disc recording apparatus according to the present invention records position information in which reference video signals are recorded in a specific area of the optical disc as the speed regeneration information, and stores the information on the optical disc corresponding to the speed regeneration information during reproduction. Only video signals stored in the area are reproduced. Accordingly, the optical disc recording apparatus according to the present invention can record a digital broadcast signal on the optical disc in a variable speed reproduction manner.

As described above, the present invention has been described in the embodiments shown in FIGS. 4 and 5, but those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. For example, when the recording / reproducing section 40 in FIG. 4 is connected to the second node 35 instead of the first node 33, the optical disc 50 has a descrambled data stream, that is, one video program. The data streams for can be recorded and the descrambled data streams can be played back from the optical disc 50. As another example, the recording / reproducing unit 140 may be connected to an output terminal of the video / audio decoder 34 to record digital video and audio data on an optical disc, and to reproduce digital video and audio data recorded on the optical disc. In addition, the shift information may be recorded in a specific area of the optical disk 50 by the recording / reproducing unit 40, unlike the direct information recorded in the specific area of the optical disk 50 by the shift information generator 46. I can understand. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a block diagram of a digital broadcast receiver with a digital video cassette recorder.

FIG. 2 shows the state of a video transport stream recorded on a video cassette tape by the digital video cassette recorder shown in FIG.

FIG. 3 is a diagram showing a state in which a video transport stream is recorded on a video cassette tape in a variable speed playback manner by the digital video cassette record shown in FIG.

4 is a block diagram of a digital broadcast receiver to which an optical disc recording apparatus according to an embodiment of the present invention is applied.

5 is an operation flowchart of a speed reproducible optical disc recording apparatus according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10,28: tuner 12,30: transmission decoder

14,32: Descrambler 16,34: Video / Audio Decoder

18,36: D-A Converter 20: TV Receiver

22: DVCR 24: Repeater

38: address generator 40: recording / reproducing section

42: reference image detector 44: memory

46: shift information generator 48: controller

50: optical disc

Claims (3)

Tuning means for tuning a transport stream to recover a transport stream in which a plurality of video packets for a plurality of video programs are alternately arranged in time from a high frequency signal; First recording means for recording the transport stream from said tuning means onto an optical disc; Reference signal detecting means for detecting positional information of a video signal as a reference for at least two or more video programs of the transport stream recorded by said first recording means; And second recording means for recording the positional information of the reference video signal detected by the reference signal detection signal in a specific area of the optical disk. The method of claim 1, And recording positions of the reference video signals are recorded in the TOC area of the optical disc. Tuning means for tuning a transport stream in which a plurality of video packets for a plurality of video programs are alternately arranged in time from a high frequency signal; Transmission decoding means for extracting data portions for a video program from the transport stream from the tuning means; Descrambling means for restoring a data stream by descrambling data portions from the transmission decoding means; Address generating means for generating a write address; First recording means for recording the data stream from the descrambling means onto an optical disc; Shift information generating means for checking the data stream from said descrambling means, detecting positional information of reference video signals of data portions recorded on an optical disk, and storing the detected positional information in a memory; And second recording means for recording the positional information of the reference video signals stored in the memory on an optical disk.