KR20050024355A - Reproduction device - Google Patents

Abstract

Even if the assumed viewing mode was changed, the video and / or audio could not be viewed under conditions suitable for each viewing mode.

Extracting any one of the signals from the recording medium 131 in which recording management information indicating a correspondence relationship between the signals compressed by a plurality of different compression methods and the signals compressed by the plurality of different compression methods, respectively, is recorded. The reproduction management information including the reproduction unit 121 for decoding, the decoding units 111 and 113 for decoding the signal extracted from the recording medium 131, and the reproduction stop information in the reproduction unit 121; And a recording unit (120) for recording the recording medium (131) corresponding to the recording medium.

Description

Playback device {REPRODUCTION DEVICE}

The present invention relates to a reproducing apparatus for recording / reproducing a moving picture using a recording medium such as an optical disc.

As a method of compressing an image at a low bit rate, there is a system stream defined in the MPEG2 standard (ISO / IEC 13818-1). Three types of program streams PS, transport streams TS, and PES streams are defined in this system stream.

As a method of compressing at a lower bit rate, there is also a system stream defined in the MPEG4 standard (ISO / IEC 14496-1). Five types of program streams (PS), transport streams (TS), H.223 streams, RTP streams, and MP4 streams are defined in this system stream.

On the other hand, optical disks, such as DVD-RAM and MO, are attracting attention as a video recording medium replacing magnetic tape. FIG. 16 shows a configuration diagram of an AV data recording and reproducing apparatus 300 for a video using a conventional DVD-RAM disk. In FIG. 16, a program stream is created in the compression unit 301 from the signals input from the video signal input unit 100 and the audio signal input unit 102, respectively, and the created program stream is passed through the recording unit 320 and the pickup 130. Are recorded onto the DVD-RAM disk 131. At the time of reproduction, the program stream taken out via the pickup 130 and the reproduction unit 321 is decoded into a video signal and an audio signal by the decoder 311, and the decoded video signal and the audio signal are decoded into a video signal output unit ( 110 and output to the audio signal output unit 112. The compression unit 301 can compress at a lower bit rate than MPEG2 and MPEG2, and the decoding unit 311 can decode a signal compressed at MPEG2 or a signal compressed at a lower bit rate than MPEG2.

At the time of recording, the recording control unit 341 controls the recording unit 320. In addition, the continuous data area detection unit 340 investigates the use situation of the sector managed by the logical block management unit 143 according to the instruction of the recording control unit 341, and detects a physically continuous empty area. When deleting the recorded video signal file, the recording control unit 341 controls the recording unit 320 and the reproduction unit 321 to perform the deletion process.

As described above, the user has conventionally reproduced, for example, a signal compressed in MPEG2 by the AV data recording and reproducing apparatus 300, and connected to a display apparatus such as a television to watch video and audio.

Recently, portable video players have emerged, which can watch images at lower bit rates. Although the configuration of the portable video player 400 is similar to that of the AV data recording and reproducing apparatus 300 shown in FIG. 16, the portable player 400 uses a battery (not shown) as a power source for portable viewing.

Thus, for example, Japanese Patent Laid-Open No. 2001-344874 discloses that when recording a broadcast program, a user compresses a video signal and an audio signal into MPEG2 when the program is watched on a television screen, and records the program on a recording medium. Recording was hereinafter referred to as recording in MPEG2. When the program is viewed by the portable video player 400, the video signal and the audio signal are compressed and recorded (referred to as recording at a low bit rate) at a bit rate lower than that of MPEG2. In addition, both the AV data recording and reproducing apparatus 300 and the portable video player 400 were provided with a resume function for viewing the next portion interrupted by the apparatus which stopped the reproduction when the reproduction was stopped. .

However, the user initially recorded the program at a low bit rate in order to watch the program with the portable video player 400 and then watched the program recorded using the portable video player 400 outdoors to a certain portion, but the next portion We can think of case to watch at home. In this case, since the program is recorded on the recording medium only at a low bit rate, even if you want to watch the program on a home television screen having a screen much larger than that of the portable video player 400, it can be viewed with high definition image quality. There was no problem.

On the contrary, it is conceivable that the program was recorded on the recording medium in MPEG2 in order to watch the program on the home TV, but the user watched the part up from the home using the portable video player 400 outdoors. In this case, since the program is recorded on the recording medium only in MPEG2, the portable player 400 decodes the signal recorded in MPEG2. Signals recorded in MPEG2 have much higher power for reading from the recording medium and power consumption when decoding than signals recorded at low bit rates. Therefore, there is a problem that the battery of the portable video player 400 is easily consumed.

As described above, since the viewing mode is specified when the program is recorded, it is difficult to view on the conditions (image quality, bit rate, power consumption, etc.) suitable for each viewing form when the assumed viewing form is changed.

1 is a block diagram of an AV data recording and reproducing apparatus according to an embodiment of the present invention;

2 is a schematic diagram showing an example of use of the AV data recording and reproducing apparatus of the embodiment of the present invention;

3 is a schematic explanatory diagram of a use situation of an AV data recording and reproducing apparatus according to an embodiment of the present invention;

4 is an explanatory diagram of a recording form by the AV data recording and reproducing apparatus according to the embodiment of the present invention;

5 is an explanatory diagram of a recording form by the AV data recording and reproducing apparatus according to the embodiment of the present invention;

6 is a configuration diagram of a full video stream created in the AV data recording and reproducing apparatus according to the embodiment of the present invention;

7 is a configuration diagram of a time information file created in the AV data recording and reproducing apparatus of the embodiment of the present invention;

8 is a configuration diagram of a mini video file created by the AV data recording and reproducing apparatus of the embodiment of the present invention;

9 is a configuration diagram of a time information file of a mini video file created in the AV data recording and reproducing apparatus according to the embodiment of the present invention;

10 is a configuration diagram of each video stream created in the AV data recording and reproducing apparatus according to the embodiment of the present invention;

11 is an explanatory diagram of a continuous data area of a moving picture stream created by the AV data recording and reproducing apparatus of the embodiment of the present invention;

12 is an explanatory diagram of continuous data of a moving picture stream created by the AV data recording and reproducing apparatus according to the embodiment of the present invention;

13 is an explanatory diagram of continuous data of a moving picture stream created by the AV data recording and reproducing apparatus of the embodiment of the present invention;

14 is an explanatory diagram of continuous data of a moving picture stream created by the AV data recording and reproducing apparatus according to the embodiment of the present invention;

Fig. 15 is a schematic diagram illustrating the use situation of the recording and reproducing system of the present invention;

Fig. 16 is a block diagram of a conventional AV data recording and reproducing apparatus.

(Explanation of the sign)

100 Video signal input 101 MPEG2 compression

102 Audio Signal Input 103 MPEG4 Compressor

110 Video signal output section 111 MPEG2 decoder

112 Audio signal output section 113 MPEG4 decoder

130 Pickup 131 DVD-RAM disc

143 Logical Block Manager 320 Recorder

321 Playback unit 340 Continuous data area detection unit

341 Recording control section 342 Playback control section

In view of the above problems, an object of the present invention is to provide a reproduction apparatus capable of viewing a video and / or an audio under conditions suitable for each viewing mode even when the assumed viewing mode changes.

In order to solve the said subject, 1st this invention is the recording in which recording management information which shows the correspondence relationship of the signal compressed by the several different compression system and the signal compressed by the said several different compression system, respectively is recorded, respectively. A reproducing section for retrieving any one signal from a medium, a decoding section for decoding a signal retrieved from the recording medium, and reproducing management information including reproducing interruption information in the reproducing section corresponding to the recording management information And a recording unit for recording on the recording medium.

In the second aspect of the present invention, the reproduction interruption information is the reproduction apparatus of the first aspect of the present invention, wherein the elapsed time after the reproduction of the signal is started.

The third aspect of the present invention is the reproduction apparatus of the first aspect of the invention, wherein the driving is performed by a battery.

The fourth aspect of the present invention is a reproduction apparatus of the first aspect of the invention, which is suitable for displaying a signal decoded by a signal compressed by MPEG2.

In the fifth aspect of the present invention, recording management information indicating a correspondence relationship between a signal compressed by a plurality of different compression schemes and a signal compressed by the plurality of different compression schemes is recorded by the reproduction apparatus of the first aspect of the present invention. A reproducing section for retrieving any one signal, the recording management information, and the reproduction management information from a recording medium on which each of the reproduction management information is recorded, and a decoding for decoding any one signal extracted from the recording medium. And a signal extracted from the recording medium is suitable for the playback section and / or the decoding section, and the playback section is adapted to the playback management information based on the recording management information and the playback management information. And a reproducing apparatus for retrieving a signal following the signal corresponding to the reproduction stop information included from the recording medium.

In a sixth aspect of the present invention, the plurality of compression methods are MPEG2 and MPEG4, and the recording management information is information corresponding to the signal compressed in the MPEG2 and the signal compressed in the MPEG4, and the signal corresponding to the reproduction stop information. The subsequent compression method of the signal is the reproduction device of the fifth invention which is a compression method different from the compression method of the signal reproduced in the reproduction device of the first invention.

A seventh aspect of the present invention is a recording apparatus for recording recording management information indicative of a correspondence relationship between a signal compressed by a plurality of different compression methods and a signal compressed by the plurality of different compression methods.

The eighth aspect of the present invention is the seventh aspect of the present invention, wherein the recording section records the MPEG-2 compressed signal and the MPEG4 compressed signal on the recording medium as alternately arranged streams.

In a ninth aspect of the present invention, the MPEG-2 compressed signal stream has at least a first predetermined continuous data area and is recorded on the recording medium, and the MPEG4 compressed signal stream has at least a second predetermined continuous data area. And a recording apparatus of the eighth aspect of the present invention, which is recorded on the recording medium.

In a tenth aspect of the present invention, the recording medium is an optical disk or a magnetic disk, and the reproducing portion of the first or fifth reproducing apparatus of the present invention for extracting a signal recorded on the recording medium, receives a signal from the recording medium. Having a head for reading, wherein the first or second predetermined continuous data area is

Vo × Tj × Vr / (Vr-Vo)

(Vo: transmission speed of each signal from the head (Mbps), Tj: maximum seek time of the head (seconds), Vr: data read rate of each signal from the recording medium to the head (Mbps)) The recording apparatus of the ninth invention of the present invention.

The eleventh aspect of the present invention provides that the recording unit and the MPEG2 compressed signal stream are the same as the reproduction time of the MPEG2 compressed signal stream and the reproduction time of the MPEG4 compressed signal stream. A tenth aspect of the present invention is a recording apparatus for recording a signal stream compressed in MPEG4 onto the recording medium.

A twelfth aspect of the present invention provides a process for recording a recording management information indicating a correspondence relationship between a signal compressed by a plurality of different compression schemes and a signal compressed by the plurality of different compression schemes on a recording medium, and from the recording medium. Taking out any one of the signals, recording the reproduction management information including the reproduction stop information on the recording medium in correspondence with the recording management information, and recording from the recording medium on which the reproduction management information is recorded. Taking out the management information and the reproduction management information, and a signal after the signal corresponding to the reproduction stop information included in the reproduction management information based on the recording management information and the reproduction management information; And a signal following a signal corresponding to the reproduction interruption information from the recording medium on which the recording medium is recorded. The decoding process and the signal following the signal corresponding to the reproduction stop information are recording and reproducing methods suitable for the reproduction process and / or the decoding process.

A thirteenth aspect of the present invention provides a reproducing unit for reproducing any one signal from the recording medium, which is the reproducing apparatus according to the first aspect of the present invention, and to operate a computer as a decoding unit for decoding the signal extracted from the recording medium. It is a program for.

A fourteenth aspect of the present invention provides a reproduction apparatus according to a fifth aspect of the present invention, wherein a reproduction section for extracting any one of said signal, said recording management information, and said reproduction management information from said recording medium, and is taken out from said recording medium. It is a program for operating a computer as a decoding unit for decoding a signal.

A fifteenth aspect of the present invention is a recording medium carrying a program of the thirteenth or fourteenth aspect of the present invention, which is a computer-readable recording medium.

In a sixteenth aspect of the present invention, there is provided management information indicating respective correspondence relations of signals compressed by a plurality of different compression methods and separately recorded on a recording medium, and during reproduction thereof. A data structure capable of recording reproduction stop information in correspondence with the management information.

According to the present invention, even when the assumed viewing mode is changed, it is possible to provide a reproducing apparatus capable of viewing video and / or sound under conditions suitable for each viewing mode.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings. 1 is a block diagram of an AV data recording and reproducing apparatus 1 as an example of the reproducing apparatus of the present invention. In Fig. 1, the signals input from the video signal input unit 100 and the audio signal input unit 102 are compressed by the MPEG2 compression unit 101 to create a program stream including the MPEG2 video stream. In addition, the same signal is compressed by the MPEG4 compression unit 103 to create an MP4 stream including the MPEG4 video stream. These compressed signals are separately recorded to the DVD-RAM disk 131 which is an example of the recording medium of the present invention via the recording unit 120 and the pickup 130, respectively. In the MPEG4 compression unit 103, compression processing is performed after the number of pixels of the video signal is reduced to 1/4. The bit rate of the program stream output by the MPEG2 compression unit 101 is about 9 Mbps as an example, and the bit rate of the MP4 stream output by the MPEG4 compression unit 103 is about 0.5 Mbps as an example.

At the time of reproduction, either the program stream including the MPEG2 video stream or the MP4 stream including the MPEG4 video stream is reproduced according to the user's selection. Specifically, when the program stream is taken out via the pickup 130 and the playback unit 121, which is an example of the playback unit of the present invention, the MPEG2 decoder 111 decodes the video signal and the audio signal, and the decoded signal is The video signal output unit 110 and the audio signal output unit 112 are output. When the MP4 stream is extracted, the MPEG4 decoder 113 decodes the video signal and the audio signal, and the decoded signal is output to the video signal output unit 110 and the audio signal output unit 112.

2 is a view for explaining an outline of an example of use of the AV data recording and reproducing apparatus 1 of the present embodiment. The portable video player 2 is another example of the playback apparatus of the present invention. Since the configuration is the same as that of the AV data recording and playback apparatus 1, the description thereof is omitted. The portable video player 2 has a battery (not shown) and can be driven by the battery. When the playback of the DVD-RAM disc 131 on which the program stream and the MP4 stream are recorded is interrupted by either the AV data recording / reproducing apparatus 1 or the portable apparatus 2, the remaining video is transferred to the other apparatus. You can watch in the format that works best for your device.

Specifically, as shown in Fig. 3 (a), even if the user interrupts the viewing of a broadcast program recorded on a DVD-RAM disc on the way using the AV data recording and reproducing apparatus 1 indoors, The next part of the program can be watched while the battery consumption is reduced in the portable player 2.

On the contrary, as shown in Fig. 3B, even when the user interrupts viewing of a broadcast program recorded on the DVD-RAM disc 131 using the portable video player 2 outdoors, The next portion of the interrupted program can be viewed with high definition image quality in the AV data recording and reproducing apparatus 1.

Next, the specific operation of the AV data recording and reproducing apparatus 1 of the present embodiment will be described. As shown in Fig. 4A, a program stream (hereinafter referred to as a full video stream) containing an MPEG2 video stream is recorded on the DVD-RAM disk 131 as a full video file MOV001.MPG. At this time, a time information file is also recorded corresponding to the full video file. In addition, an MP4 stream (hereinafter referred to as a mini video stream) containing an MPEG4 video stream is recorded on a DVD-RAM disc as a mini video file MOV001.MP4. Here, time information corresponding to the mini video stream is recorded in the header portion of the mini video file.

In this way, the same video signal and audio signal are recorded as separate files at different bit rates and the number of pixels, and simultaneously recorded and identified as recording management information including both file names in the recording management file as shown in Fig. 4C. Save the information. In addition, an identifier for identifying the program (SIML # 1 in the example of FIG. 4) is also recorded. This makes it possible to identify which program is stored in which two moving picture files. When watching the broadcast program recorded in this way, for example, when the portable video player 2 is used outdoors, a mini video file is selected or automatically selected and reproduced and decoded. Then, the user can, for example, use a relatively small 3-inch LCD screen (equivalent to part of the video signal output unit 110) and headphones (equivalent to a part of the audio signal output unit 112) to record the broadcast. Watch the program. For example, when the large-screen TV 3 is connected to and watched by the AV data recording and reproducing apparatus 1, a full moving image file is selected or automatically selected and reproduced and decoded.

Next, a description will be given of an operation in the case of watching a program recorded on the DVD-RAM disk 131 indoors on a large-screen TV 3, and watching the next portion using the portable video player 2 outdoors on the way. do.

In the case where viewing of a broadcast program recorded on the DVD-RAM disk 131 is stopped while viewing the broadcast program recorded on the DVD-RAM disk 131 by using the AV data recording and reproducing apparatus 1, the recording section (141) is recorded via the recording control section (141). The interruption of reproduction is transmitted to the 120, and the recording unit 120 records the elapsed viewing time from the beginning of the program on the DVD-RAM disc 131 as the reproduction interruption information. For example, when the viewing is stopped when 10 minutes have elapsed from the beginning of the program, the recording unit 120 uses the value of 10 minutes and the identifier of the broadcast program being watched as reproduction stop information shown in FIG. 4 (b). Write to file.

After that, when the user continues to watch the next part of the program with the portable video player 2 outdoors, the portable video player 2 receives the DVD-RAM disc 131 taken out from the AV data recording and reproducing apparatus 1. Set). Then, the user selects viewing using the mini video file in the portable video player 2, or the mini video file is automatically selected. Then, the playback unit 121 reads out the reproduction stop information on the DVD-RAM disk 131. The readout interruption information is transmitted to the reproduction control unit 142, and the reproduction control unit 142 quickly calculates the file name of the mini video file by using the identifier of the broadcast program included in the reproduction interruption information as a key, and again reproduces the interruption information. The playback stop point of the corresponding mini video file is detected by referring to the elapsed time included in the and the time information included in the header of the mini video file. The playback control unit 142 then instructs the playback unit 121 to resume playback from the playback stop point of the mini video file.

By the above operation, even if the user interrupts the viewing of the broadcast program recorded on the DVD-RAM disk 131 on the way using the AV data recording and reproducing apparatus 1 indoor, the next portion of the interrupted program is portable. The video player 2 can significantly reduce the power consumption for viewing. For example, when a 9 Mbps full video file recorded on a DVD-RAM having a transfer speed of 24 Mbps is played back compared to a case where a 1 Mbps mini video file is played back, a mini video file is reproduced and decoded. In this case, the power consumption can be reduced to 1/4 compared with the case of reproducing and decoding a full video file. In other words, the MPEG-4 signal extracted from the recording medium is suitable in that the power consumption can be reduced in the playback section 121 and / or the decoding sections 111 and 113. In other words, a signal compressed in MPEG4 is suitable for reproduction by a portable device.

On the contrary, while watching the program recorded on the DVD-RAM disc 131 outdoors with the portable video player 2, on the way, the next part is viewed on the big screen using the AV data recording and reproducing apparatus 1 indoors. The operation in the case will be described.

In the case where viewing of a broadcast program recorded on the DVD-RAM disc 131 is stopped while the portable video player 2 is being viewed, the playback unit 121 is provided to the recording unit 120 via the recording control unit 141. The interruption of reproduction is transmitted, and the recording unit 120 records the elapsed viewing time from the beginning of the program on the DVD-RAM disc 131 as reproduction interruption information. For example, when the viewing is stopped when 10 minutes have elapsed from the beginning of the program, the recording unit 120 uses the value of 10 minutes and the identifier of the broadcast program being watched as reproduction stop information shown in FIG. 4 (b). Write to file.

Then, when the user continues to watch the next part of the program on the indoor TV, the DVD-RAM disc 131 is taken out from the portable video player 2 and set in the AV data recording and reproducing apparatus 1. Then, the user selects the viewing using the full video file in the AV data recording and reproducing apparatus 1, or automatically selects the full video file. Then, the playback unit 121 reads out the reproduction stop information on the DVD-RAM disk 131. The readout interruption information is transmitted to the reproduction control unit 142, and the reproduction control unit 142 quickly calculates the file name of the full moving image file using the identifier of the broadcast program included in the reproduction interruption information as a key, and again reproduces the interruption information. With reference to the elapsed time and time information file M0V001.IFO included in the file, the playback stop point of the corresponding full video file is detected. The reproduction control unit 142 then instructs the reproduction unit 121 to resume reproduction from the reproduction stop point of the full moving image file.

By the above operation, even if the user interrupts the viewing of a broadcast program recorded on the DVD-RAM disk 131 using the portable video player 2 outdoors, the next portion of the interrupted program is recorded in the AV data. You can watch with the playback device 1. In this case, a signal compressed in MPEG2 is suitable for display on a large screen when it is decoded, so that it can be viewed with high definition image quality.

If the user continues to watch the next part of the program on any one device, the user may specify the file name of the full moving image (or mini moving image) file and skip to the corresponding point where the playback is stopped. If not, it is possible to easily watch the moving picture of the next part.

5 shows an example of the configuration of a directory of a full video file, a mini video file, a time information file, a recording management file, and a reproduction management file in the above description.

6 shows an example of the configuration of a full moving image file (MOV001.MPG) recorded on the DVD-RAM disk 131. As shown in FIG. The DVD-RAM disk 131 is composed of sectors of 2 K bytes, and 16 sectors are treated as one logical block, and an error correction code is assigned to each logical block and recorded on the DVD-RAM disk 131. In addition, a logical block that is physically continuous for 11 seconds or more in terms of the maximum recording rate is secured as one continuous data area, and a unit video packet (Video OBject UNIT) hereinafter referred to as "VOBU ”In order). One VOBU consists of a pack, which is a lower layer of an MPEG program stream in units of 2 K bytes. The pack consists of two types: a video pack (V_PCK) in which video compressed data is stored, and an audio pack (A_PCK) in which audio compressed data is stored. In addition, one VOBU includes all the V_PCKs of the corresponding time. In addition, one VOBU includes all A_TSPs including voice frames necessary for timing. That is, the video frame and the audio frame are completed in the VOBU.

The continuous data area detection unit 340 of the AV data recording and reproducing apparatus 1 redetects the next continuous data area when the rest of one continuous data area is cut for 3 seconds in terms of the maximum recording rate. When one continuous data area becomes full, the recording unit 120 writes to the next continuous data area.

7 shows an example of the configuration of the time information file MOV001.IFO. The time information indicating the correspondence between the elapsed time from the beginning of the file and the data address (number of packs) from the beginning of the file at the time of reproduction of the full moving picture stream is stored in the recording medium 131 as the time information file M0V001.IF0 separately from the full moving picture file. Stored.

On the other hand, the mini video stream is recorded on the DVD-RAM disc 131 as a mini video file M0V001.MP4. 8 shows an example of the configuration of the mini video file. In the mini video file, time information indicating the elapsed time from the beginning of the file and the data address from the beginning of the file at the time of reproduction are stored in the header portion of the file. The header of an MP4 file consists of a data structure called an atom structure, in which various attributes are stored. The time information is stored in the Sample Table Atom, as shown in FIG.

By referring to these time information, for example, the playback control section 142 can simply know the storage address of each video file corresponding to the video 10 minutes later. In the example shown in FIG. 7, as an example, the VOBU reproduction time (number of fields) corresponding to the elapsed time is requested, and the VOBU data size corresponding to the integrated value is determined. In addition, in the example shown in FIG. 9, the video frame period (time) corresponding to elapsed time is calculated | required, and the video frame size (number of bytes) corresponding to this is determined. By this operation, the address of the signal after reproduction is stopped is determined. Here, the time information stored in the time information file M0V001.IFO and the time information stored in the header of the mini video file correspond to the recording management information of the present invention as an example. In addition, the head of a file in each moving picture file is a position at which a video signal and an audio signal are started.

FIG. 10 shows that the recording contents on the DVD-RAM disk 131 are UDF (Universal Disk Format) file system or ISO / IEC 13346 (Volume and file structure of write-once and rewritable media using non-sequential recording for information interchange) file system. It is a figure which shows the state managed by. In Fig. 10, one MPEG program stream recorded continuously is recorded as the file VR_MOVIE.VRO. In this file, a file name and a file entry position are managed by a file identifier descriptor (FID). The file name is set as VR_MOVIE.VRO in the file identity fire column, and the position of the file entry is set as the head sector number of the file entry in the ICB column.

In addition, the UDF standard corresponds to the implementation protocol of the ISO / IEC 13346 standard. In addition, by connecting the DVD-RAM drive via the 1394 interface and the SBP-2 (Serial Bus Protocol) protocol, a file recorded in a UDF-compliant form can be treated as a file in a personal computer.

The file entry also manages a continuous data area (CDA) a, b, and c in which data is stored using an allocation descriptor. Specifically, when the recording control section 341 finds a bad logical block during recording to the continuous data area a, the recording control block 341 skips the logical block and continues recording from the beginning of the continuous data area b. Next, when the recording control section 341 detects that the recording control section 341 collides with the recording area of the PC file during recording to the continuous data area b, recording continues from the head of the continuous data area c. As a result, the file VR_MOVIE.VRO is composed of continuous data areas a, b, and c.

In addition, as a description rule of the allocation descriptor, the starting position of the data referred to by the allocation descriptors a, b and c in FIG. 10 coincides with the head of the sector, and the allocation descriptors a and b other than the latest allocation descriptor c are referred to. The size of the data to be mentioned must be an integer multiple of one sector.

In addition, the data size of one VOBU fluctuates in the range below the maximum recording rate if the video has a variable bit rate. If the video is at a fixed bit rate, the data size of the VOBU is almost constant.

In addition, at the time of reproduction of the recorded contents, reading of data from a phase change optical disk such as a DVD-RAM disk 131 and outputting of the read data to the MPEG2 decoding unit are performed simultaneously. At this time, the data reading speed is set to be higher than the data output speed, and control is performed so that data to be reproduced is not lost. Therefore, if the continuous data reading and the continuous data output are continued, it is possible to secure extra data to be output by the speed difference between the data reading speed and the data output speed. That is, continuous reproduction can be realized by using such extra secured data as output data while data reading is interrupted by the jump of the pickup 130.

Specifically, when the data read speed from the DVD-RAM disc 131 is 11 Mbps, the data output speed to the MPEG2 decoder is up to 8 Mbps, and the maximum travel time of the pickup 130 is 3 seconds, the pickup 130 24 Mbits of moving data are needed as extra output data. In order to secure such extra data, 8 seconds of continuous reading is required. That is, it is necessary to continuously read 24 Mbits by the difference of 11 Mbps of data read rate and 8 Mbps of data output rate.

Thus, output data of 88 Mbits, that is, 11 seconds, is read during 8 seconds of continuous reading, thereby ensuring continuous data reproduction by securing a continuous data area of 11 seconds or more.

In addition, several bad logic blocks may exist in the middle of the continuous data area. In this case, however, it is necessary to predict the read time required to read such a defective logical block during reproduction, and to secure the continuous data area slightly more than 11 seconds.

Generalizing the above description, if the maximum seek time of the pickup 130 is Tj (seconds), the data output speed of the pickup 130 is Vo (Mbps), and the data reading speed of the pickup 130 is Vr (Mbps). The minimum size of the continuous data area can be expressed as follows.

Minimum size of continuous data area = Vo × + j × Vr / (Vr_Vo)

Here, Vo and Vr are different in the case of MPEG2 and MPEG4, respectively, the first predetermined continuous data area of the present invention and the second predetermined continuous data of the present invention, each being the minimum size of the continuous data area appropriate for the compression scheme. The area is determined. 11 shows the relationship of the above equation. By determining the continuous data area in this manner, as shown in Fig. 12, even when two moving picture streams are alternately recorded, each data can be taken out without freezing the data.

Here, MPEG2 is larger in the continuous data area in which continuous data reproduction is guaranteed than in MPEG4. Thus, for example, by continuously recording 11-12 seconds of full video data for which continuous playback is guaranteed in MPEG2 and mini-video data of 11-12 seconds in the same manner, both continuous video data can be continuously played back. At this time, since the mini-movies are recorded in longer units of 11 to 12 seconds, the screen output delay time of each frame of the mini-movies ends shortly due to the increase in cases in which pickup processing is unnecessary. Since the mini moving picture has a small data size, all the data can be arranged in the memory, thereby facilitating smooth high-speed playback (for example, double speed playback, etc.) using all the recorded frames. In the same case of a full moving picture, it is difficult to put the frame data on the memory because of the large data size. It is not smooth compared with the case of moving picture. In addition, since the mini video image has a small data size, reverse 1x speed reproduction, double speed reproduction, and the like are also possible. In addition, processing of special reproduction such as coma sending and coma reversal can be realized quickly and easily if there is data in the memory.

In this case, however, it is preferable that the moving picture data and the mini moving picture data have two consecutive data areas as one group, so as not to be physically separated in the group. In addition, it is preferable that the continuous data area of the mini video data is physically located ahead of the order of the block number than the continuous data of the full video. This is because the data to be reproduced by both parties can be read more quickly at the same time. This makes it possible to further shorten the first screen output time during simultaneous playback.

Each continuous data area does not have to be physically continuous as shown in Fig. 13 as long as the respective data size satisfies the above relationship. However, MPEG-2 has a first predetermined continuous data area (CDA), MPEG2 has a second predetermined continuous data area so that video and audio can be continuously reproduced without freezing. In the area, it is necessary to record each file physically and continuously. This can reduce the seek operation of the pickup 130 when recording two files at the same time.

In addition, when each data area is recorded so that the reproduction time of each data is the same, a full moving picture and a mini moving picture can be reproduced simultaneously. That is, for example, the playback unit 121 in FIGS. 1 and 2 extracts both the full video file and the mini video file from the DVD-RAM disk 131, and the MPEG2 decoder 111 and the MPEG4 decoder ( 113 decodes each moving image file, and outputs each decoded video signal and audio signal to the display unit 3 of the portable video player 2 and the display device 3 connected to the AV data recording and reproducing apparatus 1. If so, the full video file and the mini video file can be viewed simultaneously (i.e., in the same reproduction progress).

In this case, since the full video file and the mini video file are each framed based on the same clock at the time of compression, the playback timing of each frame of the full video and the mini video file is adjusted by matching the start timing of the first one frame. Matches in subsequent frames played back. The reproduction timing of the first one frame of the full moving image and the mini moving image coincides when the reproduction starts from the moving image data corresponding to the same time with reference to the time information in the time information file and the time information in the mini moving image file, respectively.

As shown in Fig. 14, data such as a PC file may be sandwiched (interleaved) between the respective continuous data areas.

In addition, in the above description, although the portable video player 2 is used outdoors and the AV data recording and reproducing apparatus 1 is used indoors, of course, it is not limited to this. As shown in Fig. 15, the portable video player 2 and the AV data recording and reproducing apparatus 1 may be connected and used.

In that case, as long as the device can remotely operate the other device from one device, it is not necessary to reinsert the DVD-RAM disk 131 between the devices. For example, when the playback unit 121 of the AV data recording and reproducing apparatus 1 extracts both a full moving picture file and a mini moving picture file and sends the mini moving picture file to the portable video player 2, the portable video player ( In 2), only the mini video file is decoded, so that the battery consumption of the portable video player 2 can be reduced. For example, the user can watch the next part in the bedroom by watching the AV data recording and reproducing apparatus in the living room, but remotely from the portable video player 2 in the bedroom without ejecting the DVD-RAM disc. And so on.

In the present embodiment, the storage medium is a DVD-RAM disk, but is not particularly limited thereto. For example, MO, DVD-R, DVD-RW, DVD + RW, CD-R, CD-RW, and the like. Any recording medium having a disk shape such as an optical disk or a hard disk can be used. In addition, the semiconductor memory may be used. In such a case, the same effects as described above can be obtained.

In this embodiment, the read and write heads are the pickups 130, but in the case of M0, they are pickups and magnetic heads, and in the case of a hard disk, they are magnetic heads.

In the present embodiment, the broadcast program is compressed to MPEG2 and MPEG4 in the AV data recording and reproducing apparatus. However, in the case of digital broadcast waves, the MPEG2 compressed stream and the MPEG4 compressed stream included in the broadcast wave are separately separated as the transport stream. It may be recorded as a file. In addition, you may record to one file. In the latter case, however, the same file name is registered in the simultaneous recording identification information of FIG.

In this embodiment, the reproduction stop information of 3 is recorded on a recording medium such as a DVD-RAM disk 131, but may be recorded in a flash memory built in the AV data recording and reproducing apparatus. In this case, however, it is necessary to record the media identifier together with the identifier in the flash memory in order to identify which recording medium is stopped.

In this embodiment, the simultaneous recording identification information shown in Fig. 4 is recorded on a recording medium such as a DVD-RAM disk 131, but may be recorded in a flash memory built in the AV data recording and reproducing apparatus. In this case, however, it is necessary to record the media identifier together with the identifier in the flash memory to identify which DVD-RAM disc is the name of the moving image file.

In the present embodiment, when the mini moving picture is reproduced, the power consumption can be reduced by lowering the rotation speed of the DVD-RAM drive in accordance with the bit rate of the mini moving picture.

In the present embodiment, the mini video is compressed into an MP4 stream including an MPEG4 video stream, but may be an MPEG-TS stream or the like. In addition, a QuickTime file including a continuous JPEG stream (Motion JPEG stream) or a file including a stream conforming to the Motion JPEG 2000 standard may be generated.

The compression method of the present invention is not limited to two types of compression methods, but may be three or more different compression methods. In that case, if it decodes with the apparatus which has a decoding part suitable for each compression system, the effect similar to the above can be acquired.

Further, in the present embodiment, although the AV data recording and reproducing apparatus 1 is an example of the reproducing apparatus of the present invention, a correspondence relationship between a signal compressed by a plurality of different compression methods and a signal compressed by a plurality of different compression methods In the case where recording management information indicating a is recorded on the recording medium, this is also an example of the recording apparatus of the present invention. In this case, since the recording apparatus of the present invention only needs to have the above-described function, it can be considered that there is no reproduction function.

In addition, in the above description, the portable video player 2 may not have a function of compressing a signal by a plurality of different compression schemes and a recording function of recording the compressed signal. In other words, the portable video player 2 may be a playback-only device. However, as described above, it is necessary to have a recording function for recording the reproduction stop signal on the recording medium.

The playback apparatus of the present invention can also be considered to be a single device in which the functions of the AV data recording and playback apparatus 1 and the function of the portable video playback apparatus 2 are combined. That is, when viewing indoors, it is connected to a power supply line and a large screen TV 3, and used as an AV data recording and reproducing apparatus 1, and when it is taken out outdoors, it is driven by a battery and operated as a portable video player 2. I can think of it. Even in such a case, the same effects as described above can be obtained.

Each compressed data may also be recorded in a flash memory built into the AV data recording and reproducing apparatus 1.

Incidentally, in the above description, the recording on the recording medium of the present invention is taken as a broadcast program as an example, of course, but is not limited to this.

The program of the present invention is a program for executing a function of all or part of the means (or apparatus, element, etc.) of the reproduction apparatus or recording apparatus of the present invention described above by a computer, and operates in cooperation with the computer. Program.

In addition, the recording medium of the present invention carries a program for causing a computer to execute all or part of the functions (or devices, elements, etc.) of all or a part of the reproducing apparatus or recording apparatus of the present invention described above. The recording medium is a recording medium, which is readable by a computer, and wherein the read program executes the function in cooperation with the computer.

In addition, said "some means (or apparatus, element etc.)" of this invention means one or some means in these some means.

In addition, the "function of a means (or apparatus, element, etc.)" of this invention means the function of all or one part of the said means.

In addition, one of the forms of use of the program of the present invention may be recorded on a computer-readable recording medium and operated in cooperation with the computer.

In addition, one of the usage forms of the program of the present invention may be a form transmitted through a transmission medium, read by a computer, and operating in cooperation with a computer.

In addition, the recording medium includes a ROM and the like, and the transmission medium includes a transmission medium such as the Internet, light, radio waves and sound waves.

The computer of the present invention described above is not limited to pure hardware such as a CPU, but may include firmware, an OS, and even peripherals.

As described above, the configuration of the present invention may be implemented in software or in hardware.

In addition, the data structure recorded on the recording medium such as DVD-RAM in the above description is also included in the scope of the present invention. In this case, the data structure includes a database, a data format, a data table, a data list, a kind of data, and the like.

As described above, according to the reproduction apparatus and the recording apparatus of the present invention, the broadcast program can be efficiently viewed both outdoors and indoors. In other words, the battery consumption of the recording / reproducing apparatus can be suppressed during outdoor viewing, and the next part of the same program can be easily switched on a large screen TV for viewing indoors.

The recording and reproducing system of the present invention has an effect that a video and / or audio can be viewed under conditions suitable for each viewing mode even when the assumed viewing mode changes, and is useful as a playback device or the like.

Claims (2)

A reproducing unit for extracting any one signal from a recording medium on which recording management information indicating a correspondence relationship between the signals compressed by a plurality of different compression methods and the signals compressed by the plurality of different compression methods are recorded, respectively; , A decoder which decodes the signal extracted from the recording medium; And a recording unit which records the reproduction management information including the reproduction stop information in the reproduction unit on the recording medium in correspondence with the recording management information. The method of claim 1, And the reproduction stop information is an elapsed time after the reproduction of the signal is started.