JP2000115701A - Recording device, reproducing device and recoding medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital versatile disk(DVD) system that records/ reproduces a high definition TV(HDTV) signal. SOLUTION: A recording rate storage section 13 stores a recording rate where a recording density per a track varies for a radial direction position. A transmission rate comparison section 15 compares a transmission rate of a HDTV elementary stream 12 detected by a transmission rate detection section 14 with a reproduction transmission rate in which a medium recorded at a recording rate stored in the recording rate storage section 13 is reproduced by a prescribed reproduction method. A block replacement section 16 generates recording position replacement information on the recording medium based on the result of comparison, a DVD format section 17 generates a DVD format stream 19 including physical information on the recoding medium and a DVD- RAM drive 20 writes the stream 19 on a DVD RAM 2. A reproducing device 3 reproduces the stream in the RAM 2 by a high multiple speed VD-ROM drive 31, an MPEG 2 decoder 32 corresponding to HDTV decodes the reproduced stream and displays the decoded stream on an HDTV display device 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for recording / reproducing a data stream compressed by a variable rate compression technique such as MPEG on a disk-shaped recording medium. The present invention relates to a recording apparatus, a reproducing apparatus, and a storage medium which record data on a recording medium at a constant angular velocity and vary a reproduction transfer rate during reproduction.

[0002]

2. Description of the Related Art DVD (Digital Versatile Disk)
The current TV signal of NTSC or PAL for about 2 hours
This is an optical disc standard for recording, reproducing, and compressing with G2. In order to reproduce this DVD disc, a consumer player (hereinafter, referred to as a DVD player) used by connecting to a normal television and a ROM drive for a computer (hereinafter, referred to as a DVD-ROM drive) are commercialized. ing.

The external dimensions of a DVD disk are CD-RO
It has the same diameter of 120 mm and thickness of 1.2 mm as M, but C
While the D-ROM is a 1.2 mm single plate, the DV
D has a structure in which two 0.6 mm thick disks are bonded together.

[0004] The recording surface has a maximum of two layers per side, and recording can be performed on both sides. The storage capacity is 4.7 for single-sided, single-layer recording.
G bytes, 8.5 Gbytes for single-sided dual-layer recording, 9.4 Gbytes for double-sided single-layer recording, and 17 Gbyte for double-sided two-layer recording. The track pitch is 0.74 μm, and the data reading laser wavelength is 650 nm. Data transfer speed is 1350 Kbytes / sec with standard speed drive, CD-R
When applied to an OM drive, it is equivalent to 9x speed.

The logical format of DVD includes UDF
(Universal disk format). UDF
Is an ISO 9660 with an item related to rewriting added.
It is based on SO13346.

[0006] Read-only DVD-ROM, DVD-
In addition to Video discs, the official version of DVD-R and DVD-RAM standards, which are data writable standards, has also been announced, and a medium and a drive device that conform to the 4.7 GB capacity of DVD-ROM have been developed. Have been.

[0007]

SUMMARY OF THE INVENTION Such a conventional DV
In D, it was possible to reproduce the current TV of NTSC or PAL, but there was a problem that there was no recording device or reproduction device for recording HDTV with higher definition than the current TV.

In view of the above problems, an object of the present invention is to provide a recording apparatus capable of recording an HDTV signal which has been subjected to variable rate compression encoding, and a reproducing apparatus which reproduces an HDTV signal from a recording medium recorded by the recording apparatus. , And a recording medium.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a disk-shaped recording medium having a distance of 1 to the radial position.
Recording rate storage means for storing a recording rate at which the recording density per track changes; input means for inputting a coded signal obtained by performing variable length coding on a material signal; Recording means for recording each block constituting the coded signal in an area of the recording medium in which a reproduction rate when reproduced by the method is higher than a transmission rate of the coded signal. It is.

In the present invention, the recording rate may be a constant linear recording density on the recording medium or a different angular recording density for each radially divided area of the recording medium. The recording capacity is higher on the outer circumference than on the inner circumference.

[0011] The present invention also provides a reproducing apparatus which performs reproduction control in accordance with the reproduction control information when reproducing a recording medium on which reproduction control information relating to a rotation speed or a reproduction transmission rate during reproduction is recorded. is there.

Further, the present invention is a recording medium in which reproduction control information relating to a rotation speed or a reproduction transmission rate at the time of reproduction is recorded so that it can be recognized even by a standard speed reproduction apparatus.

In the present invention, for example, a high-definition TV signal is recorded at a low speed on a DVD disk at a standard density, and the DVD disk is recorded at a CAV (constant angular velocity) generally used in a standard speed DVD-ROM drive, for example. ) 5
Play at twice the rotation speed.

In the case of reproduction by CAV, since data is recorded at a constant recording density on the disk surface, the reproduction transfer rate is determined in proportion to the relative speed between the pickup and the disk during reproduction. In CAV, since the disk is rotated at a constant rotational angular velocity regardless of the recording position, the relative speed between the pickup and the disk changes in proportion to the radius of the reading position.

For this reason, when a disc recorded at a constant recording density is reproduced by CAV, the relative transmission speed is low on the inner radius side having a small radius, so that the reproduction transmission rate is low, and the relative speed is low on the outer radius side having a large radius. Since it is large, the reproduction transmission rate is high.

When a video signal is encoded using variable-length encoding such as MPEG2, there are portions where the transmission rate of the encoded signal is high and low depending on the contents of the content.

Therefore, the portion where the transmission rate of the coded signal is high is arranged on the outer periphery of the DVD disk, and the portion where the transmission rate is low is arranged on the inner periphery of the DVD disk.

According to the above arrangement, the CAV DVD-R
The entire area of the DVD disk can be effectively used without changing the OM drive, and high-definition TV images requiring a high transmission rate can be recorded and reproduced.

[0019]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is an overall system configuration diagram of a recording device, a playback device, and a recording medium according to the present invention. FIG. 2 is a configuration diagram of a high-definition TV-compatible DVD disc creation system as a recording device. Correspondence D
FIG. 4 is a configuration diagram of a VD player system, FIG. 4 is a configuration diagram of a DVD-RAM drive as a part of a recording and reproducing device, FIG. 5 is an explanatory diagram of a recording method by a recording device, and FIG.

Hereinafter, embodiments will be described in the following order. [1] Overview of entire system [1.1] High definition TV recording / reproducing system [1.2] High speed rotation of DVD disc [2] DVD disc creation encoder system [2.1] Encoder system [2.2] Formatter system [3] ] Disc system [4] High definition DVD player [4.1] Decoding circuit [4.2] CAV and variable rate [5] DVD disc format [6] High-speed rotation flag

[1] Overview of Overall System FIG. 1 shows an overview of a high-definition TV (hereinafter abbreviated as HDTV) recording / playback system including a recording device 1, a playback device 3, and a DVD disk 2 as a recording medium according to the present invention. FIG. 2 is a system configuration diagram to be described. Referring to FIG.
Is a hard disk 11 for storing an HDTV elementary stream 12 and a recording rate storage unit 13, a transmission rate detection unit 14, a transmission rate comparison unit 15, a block replacement unit 16, a DVD format unit 17, and a hard disk 18 for storing a DVD format stream 19. , DVD
A RAM drive 20 is provided.

The hard disk 11 of the recording apparatus 1 has a variable length encoded H by an HDTV-compatible encoder (not shown).
The DTV elementary stream 12 is input and temporarily stored. Further, the hard disk 11 has a recording rate storage unit 13 for storing a recording rate at which a recording density per track changes with respect to a radial position of a DVD disk which is a disk-shaped recording medium.

The transmission rate detector 14 detects the transmission rate of the HDTV elementary stream 12 as a function of time. This can be regarded as a transmission rate along the time axis of the content, and is a transmission rate necessary for HDTV reproduction.

The transmission rate comparing section 15 detects the reproduction transmission rate when the DVD disk recorded at the recording rate stored in the recording rate storage section 13 is reproduced by a predetermined rotation method, and the transmission rate detecting section 14 detects the reproduction transmission rate. By comparing the transmission rate with the transmission rate, it is detected whether or not the latter exceeds the former, and if so, which block or which time has been exceeded.

The block replacing section 16 replaces the recording position of a block exceeding the reproduction transmission rate among the blocks constituting the HDTV elementary stream 12 with another block so that none of the blocks exceeds the reproduction transmission rate. , And assigns track positions on the DVD disk to create physical track assignment information. This physical track position assignment information is stored in the DVD format unit 17.
Output to

The DVD format unit 17 stores the physical track allocation information output from the block
Input TV elementary stream 12 and DVD
A format stream 19 is created and temporarily stored on the hard disk 18.

The DVD-RAM drive 20 reads the DVD format stream 19 from the hard disk 18 and writes the DVD format stream 19 on the DVD-RAM disk 2 at the recording rate stored in the recording rate storage unit 13 to operate as the recording device 1 and the recording medium. DVD-RAM as
Complete writing.

The playback device 3 includes a high-speed DVD-ROM drive 31, an HDTV-compatible MPEG2 decoder 32, an HD
A TV display 33 is provided. When the DVD-RAM disk 2 is reproduced, for example, assuming that recording is performed at a 1-time density, the read speed of the DVD-ROM drive 31 needs to be at least 5 times the read speed of a conventional DVD-ROM drive in CAV. .

The HDTV stream read by the DVD-ROM drive 31 is decoded by an HDTV-compatible MPEG2 decoder 32 and is output to an HDTV display 33.
Will be displayed. The above is the outline of the present system.

[1.1] HDTV recording / reproducing system Next, an HDTV recording / reproducing system will be described. A first feature of a recording / reproducing system including a recording device, a reproducing device, and a recording medium according to the present invention is to provide a high-definition TV image as compared with a conventionally used TV system such as NTSC or PAL. It is an object of the present invention to provide a recording / reproducing device compatible with HDTV.

Here, the HDTV is a television standard BTA S-001, BTA S-00.
2, 1125 scanning lines, 750 lines, 1250 lines of HDTV system defined by SMPTE 260M, etc.,
HDT by progressive scanning such as 525P (Progressive)
Includes TV according to the V system.

In order to obtain the HDTV image, the studio uses, for example, an HDTV-compatible VCR for the source and an HDTV-compatible monitor for the display. Further, as the MPEG2 encoder and the MPEG2 decoder, for example, a device compatible with HDTV, for example, the MP @ HL specification is used.

[1.2] High Speed Rotation of DVD Disc A second feature of the present invention is that the number of revolutions of the disc 2 is higher than that of a conventional apparatus when reproducing a disc-shaped storage medium. . When compressing and recording an HDTV signal, the transmission rate after compression is also changed to the current TV disc (DV
The transmission rate becomes higher than D).

The transmission rate is determined by the recording / reproducing parameters (pit size, C / N, etc.), image quality, and recording time of the disk. In general, the transmission rate is about 4 to 6 times that of the current DVD that enables the reproduction of the current NTSC. In order to enable reading at this transmission rate, the number of rotations of the disk is about five times or more that of a conventional DVD-ROM.

At this time, as an example, a DVD-ROM having a rotation speed of 5 times can obtain a data transfer rate of 6535 KB / sec at the maximum, and can realize a DVD compatible with the HDTV system.

[2] Encoder System for Creating DVD Disc Next, an example of a system configuration of an encoder for creating a DVD disc as a detailed embodiment of the recording apparatus according to the present invention will be described with reference to FIG.

In FIG. 2, the DVD disk creation encoder system includes a studio control device 101, an HDTV
VTR 102, console 103, encoder 10
4, a console 105, a monitor 106, a video / audio / sub-video decoder 107, a formatter EWS (Engineering Work Station) 108, a network 109, and an encoder EWS 104a.

The encoder 104 inputs a material signal from the HDTV VTR 102 on which video and audio signals are recorded,
The video is encoded by a video encoder 118 by a variable length encoding such as MPEG2 to obtain a video stream, and the audio is encoded by an AC-3 audio encoder 119 to obtain an audio stream.
A) A video / audio stream is temporarily stored in the hard disk 121 via the 120.

Although not shown, a still picture encoder is used to encode a still picture, for example, an MPEG-2 I picture, to obtain a still picture stream. Although not shown, the text is converted into a code. Data is not shown, but
A predetermined conversion is performed to obtain a data stream.

Here, the video encoder 118
An inter-frame motion compensation DCT variable length encoding process such as G2 is performed to create a compressed bit stream, which is stored in the hard disk 121. When compressing, variable rate compression is used. As one of the variable rate compression encoding methods, a method called a two-pass method is used.

First, in the first pass, the statistical value of the required code amount based on the video material signal is calculated. The statistical value of the generated code amount is compared with the recordable code amount on the disk, and each encoding rate is determined so that the HDVTR material to be compressed and recorded on the disk can be recorded. , And performs a compression process to obtain a video bit stream.

Further, as for audio, an audio bit stream is obtained by using the audio encoder 119 and using a predetermined compression such as AC3 audio compression.

Each elementary stream of video, audio, still image, and soft data is multiplexed by software of the DVD formatter 154 via the network 109 as necessary, and a multiplexed stream of, for example, a DVD format is obtained. . The multiplexing process uses, for example, a signal processing device using a CPU such as a workstation such as a formatter EWS108 or a personal computer.

Here, at a minimum, since the compression of the video uses variable rate compression, the multiplexed stream also has a variable rate. In order to reproduce an HDTV reproduction image with an appropriate image quality, the average transmission rate of the multiplexed stream must be 1
5 Mbps and a maximum transmission rate of about 30 Mbps are required.

[2.1] Encoder System The encoder system is a system that performs variable-length encoding such as MPEG on a material signal including video and audio.
Studio control equipment 101, HDTV VTR 102, console 103, encoder 104, encoder EWS
104a.

The encoder 104 includes, as hardware, a video encoder 118 and an AC-3 audio encoder 1
19, a DMA 120, a hard disk 121 for storing encoded video and audio streams, and a network interface 122.

The encoder EWS 104a includes, as software, a studio control unit 110, a graphical user interface (GUI) 111, an MPEG2 rate control unit 112, a video encoder control unit 113, an audio encoder control unit 114, and a system control unit 11.
5, a compressed data accumulation control unit 116 and an elementary decoder 117.

The HDTV video / time code read from the HDTV VTR 102 is
8 and is subjected to variable length coding at a transmission rate according to the control of the MPEG2 rate control unit 112. At this time, H
Audio is simultaneously read from the DTV VTR, and AC-
It is encoded by a three-speech encoder 119.

The encoded video and audio streams are D
The data is temporarily stored in the hard disk 121 via the MA 120, and then sent from the hard disk 121 to the formatter EWS 108 via the network interface 122 and the network 109.

[2.2] Formatter System The formatter system converts video / audio encoded by the encoder system into a format for recording on a DVD disc. The console 105 for controlling the system includes A monitor 106 for confirming video / audio, a video / audio / sub-video decoder 107, and a formatter EWS108 are provided.

The formatter EWS 108 is, as hardware, an extended box interface 15 for interfacing with the video / audio / sub-video decoder 107.
6, a hard disk 155 for storing a formatter parameter file, a hard disk 157 for storing an elementary stream, a hard disk 158 for storing a DVD format stream, and a network interface 159.

The formatter EWS 108 includes a GUI 151, an editor 152, an elementary decoder 153, and a DVD formatter 154 as software.

The formatter EWS 108 reads chapter data 160 and formatting parameters 161 of the content to be formatted from an input device such as a floppy disk drive (not shown). .

On the other hand, the video / audio elementary streams sent from the encoder EWS 104 via the network 109 are stored in the hard disk 157.

Then, in response to a format instruction from the console 105, the DVD formatter 154 takes out the elementary stream from the hard disk 157 and performs a DVD recording format according to the formatter parameters stored in the hard disk 155 to create a DVD format stream. Then, it is stored in the hard disk 158.

When the contents to be recorded on one DVD recording medium are arranged in the form of a DVD format stream,
Network interface 159, network 10
9 to a DVD-RAM drive (not shown) or a cutting machine for creating a DVD-ROM master (not shown), and a recording medium or a master disk of the recording medium is created. When a DVD-ROM is created, cutting, master creation, and replication creation of a master are performed by a well-known process to create a DVD-ROM.

[3] Disk System FIG. 4 shows a DVD-RA as a disk-shaped recording medium drive.
FIG. 3 is a diagram illustrating an example of an M drive. In the drawing, the case where the disc-shaped recording medium is a DVD disc 2 will be described. However, the disc-shaped recording medium may be any other optical disc such as a CD, or a magnetic disc (such as an HDD). The gist of the present invention does not change even with a magneto-optical disk (such as an MO).

The DVD-RAM drive first has a DVD
The pickup 202 is set to the innermost circumference (in some cases, a specific position such as the outermost circumference) according to an instruction of the MPU 318 that controls the entire RAM drive, and the spindle motor 2
01, and the focus servo 311 and the tracking servo 313 are applied.

The rotation of the disk is controlled by the spindle motor 20.
Perform by 1. At this time, the rotation is controlled using the motor servo 315 in the servo processor 208. When applying the motor servo 315, the reference signal is synchronized by the synchronization circuit 316.

Synchronization is roughly divided into CA
According to two disk rotation methods, V and CLV.

Rotation method 1: CAV (Constant Angula)
r Velocity) In the case of CAV, synchronous control is performed so that the rotation speed of the disk 2 becomes constant. Since the rotation speed is constant, the transfer rate is low on the inner circumference of the disk, and higher on the outer circumference. The reason for using CAV is to exert superiority in access time and seek time. As a necessary matter, it is necessary that the high transfer rate on the outer periphery can be processed by the preamplifier demodulation circuit and the error correction circuit.

Rotation method 2: CLV (Constant Linear)
Velocity) In the case of CLV, synchronous control of the rotation of the disk is performed so that the linear velocity for reading tracks from the disk 2 is constant. The reason for using CLV is to increase the recording density. A necessary matter of CLV is that it is necessary to change the rotation speed of the spindle motor 201 depending on the reading position on the disk.

In order to optimally read the pits on the disk 2, the servo processor 208 applies a focus servo 311, a slide servo 314, and a tracking servo 313. A focus servo 311 for optimizing a focus for optimally reading a pit by the pickup 202 is applied. Further, a slide servo 314 for sliding the pickup to sequentially read the tracks on the disk, and a tracking servo 31 for optimally tracing the tracks when further sliding.
Multiply by 3.

The signal read by the pickup 202 is
The signal is amplified by the preamplifier 210a, passed through a clock extraction / pit extraction / equalizer 210b, fed back to the servo processor 208,
1. By applying the tracking servo 313, it is possible to perform optimal reading of the reproduction signal.

[4] High Definition DVD Player FIG. 3 shows the configuration of an HDTV compatible DVD player system. An output signal of the preamplifier 210 including functions such as clock extraction, pit extraction, and equalization is input to the data processor 211. In the data processor 211, demodulation, error correction, error correction, and deinterleaving are performed. In the case of a DVD-ROM, the data is input to the decoding circuit 215 through a bus interface 234.

The output stream of the data processor 211 is passed through a decoding circuit 215 to perform a decoding process, and decode signals are output from terminals 241, 242, and 243. When connecting the DVD-ROM drive and the decoding circuit, a bus interface 234 is used.

[4.1] Decoding Circuit Next, a decoding circuit in the HDTV-compatible DVD player system of FIG. 3 will be described. The following processing is a specific example of the decoding processing.

For video, HDTV compatible MPEG2
Is subjected to the motion-compensated inter-frame DCT decoding process.
As one example, an MPEG2 video decoder 235 for HDTV is used.

For audio, the audio decoder 231 performs an expansion process such as an MPEG2 audio decoding process or an audio decoding process such as AC3.

The still picture is subjected to MPEG I-picture decoding using the sub-picture decoder 237. The text is processed by using the sub-picture decoder 237 to inversely transform the code. Although not shown, data is similarly processed by inversely transforming the data.

Incidentally, regarding these decoding processes,
Although described as an example of the embodiment, the gist of the present invention does not change at all even when another decoding process is adopted.

[4.2] CAV and Variable Rate In general, the DVD-ROM drive uses the CAV method in many cases. The reason for this is, as described above, that CAV
This is because in the system, the rotation speed is constant irrespective of the access position on the disk, and there is no need to change the rotation speed of the rotating unit having a large moment of inertia, thereby increasing the access speed.

In one embodiment of the present invention, CAV is 5
A case where a double-speed DVD-ROM drive is used will be described. It should be noted that the present invention can be used as long as the code compressed at a variable rate by rotating at a high speed can be appropriately recorded and reproduced even if the speed is not 5 ×.

When the recording medium to be reproduced is recorded at the standard density, the reproduction transfer rate of the 5 × DVD-ROM drive is 52.28 Mbps (= 6535 KB) on the outer periphery.
/ S), 23.52 Mbps (= 2940 KB /
S), and changes with respect to the position in the radial direction as indicated by reference numeral 401 in FIG. Also, as described above, the maximum compression rate of HDTV is 30.
Mbps, and the average rate is 15 Mbps.

As an example, suppose that the result of compressing the HDTV signal of the content composed of five blocks A, B, C, D, and E at a variable rate is as indicated by reference numeral 403 in FIG. 5B. This transmission rate is grasped by the transmission rate detector 14 in FIG.

When this signal is sequentially recorded from the inner circumference to the outer circumference of the DVD disk, the blocks A and B where the transfer rate of the image stream is higher than the transfer rate of the disk cannot be reproduced correctly. Will be gone.

This determination is made by the transmission rate comparing section 15 shown in FIG.
, The recording rate storage unit 13 and the transmission rate detection unit 1
4 is performed.

Therefore, as shown in FIG. 5C, the blocks 403a and 403 of the coded signals of A and B at a high transfer rate.
b can be correctly reproduced by moving to a recording position where a high reproduction transfer rate is possible and recording. For this replacement, the blocks of each encoded signal are replaced using the block replacement unit 16 in FIG.

In this example, recording is performed in the order of C → A → B → D → E. To do this recording, the encoder system
Knowing the rate of the coded signal compressed at the variable rate,
A comparison is made with the transfer rate of the VD-ROM drive. This comparison is performed by, for example, calculating and comparing with the CPU of the formatter EWS108 and the personal computer or the like in FIG. The arrangement of the encoded signal on the disk is determined based on the result of this comparison.

In the case where the optimal arrangement is performed, if there is a portion that exceeds the disk transfer rate, the portion is recorded by lowering the transfer rate, re-encoding, and replacing the bit stream. Create a stream.

Further, the navigation and navigation described in [5]
If the command (Navigation Command) specifies that the playback block order is A → B → C → D → E, playback is easy in the correct order even if the recording order does not match the playback order. Can be done. At the time of playback, the navigation command is read from the disk 2 and playback control is performed according to the command to perform playback.

For this purpose, for example, the DVD formatter 154 of FIG. 2 creates a navigation command based on the reproduction order of the stream and arranges it in the stream.

At the time of reproduction, a navigation command in the stream is extracted, the reproduction position of the pickup is defined by the MPU based on the extracted value, and the reproduction is performed in the order of A → B → C → D → E.

In addition to the recording method of the recording medium, in addition to the CLV, the recording medium is divided concentrically into a plurality of areas, and the CAV for each area is divided.
May be used. For example, an example in which the recording medium is divided into five areas and a plurality of zones CAV in which the rotation speed increases sequentially from the inner peripheral area to the outer peripheral area is shown as reference numeral 402 in FIG. Become. Again, in this case,
It is effective to arrange the recording positions on the medium such that the reproduction transfer rate is compared with the transmission rate of the variable-length encoded content so that the former exceeds the latter.

[5] DVD Disc Format FIG. 6 is a view for explaining the file format of a DVD video disc. DVD discs divide the volume space into a volume file management zone, a DVD-video zone, and other zones for optional DVDs.

The DVD video zone includes a video manager (VMG) and one or more and no more than 99 video title sets (VTS # 1 to VTS # 99).

The video manager includes video management information (VMGI), a video object set for a VMG menu (VOBS), and a VMGI backup.

Each video title set (VT
S) is video title set information V
It consists of a TSI, a video object set for menus (VOBS for menus), a video object set for titles (VOBS for titles), and a VTSI backup.

Each title VOBS has a maximum of 2 ¹⁶ -1 video objects (VOB # 1, VOB # 2,
..), Each VOB has at least one CEL
L.

The navigation command for designating the video playback order is composed of a CN string sandwiched between a pre-command and a post-command.
A specific cell is specified by the OB number and the cell number. Thus, the cell can be arranged at a desired position on the DVD recording medium.

In the present invention, the navigation
Using the command, the reproduction order is changed from A → described in [4.2].
Designate in the order of B → C → D → E. Thus, the recording order (recording position) on the DVD disk is C → A → B → D → E
Can be played back in the correct order.

[6] High-Speed Rotation Flag In the present invention, it is necessary to reproduce a high-speed HDTV signal at a higher transfer rate than a conventional NTSC-TV signal by compressing and recording the HDTV signal. Yes. For this reason, it is necessary for the DVD-ROM drive or DVD player to rotate about five times faster than the conventional disk rotation speed of DVD. Therefore, a flag indicating that the number of rotations of the disk is required to be about five times or more is recorded on the disk in the recording medium.

At the time of reproduction, the high-speed rotation flag is used, for example, by the flag determination unit 212 in the data processor 211 in FIG.
When it is determined that high-speed rotation is necessary and the DVD player supports high-speed rotation, the HDTV is transmitted from the data processor 211 to the decode circuit 215.
Instruction to perform the corresponding (MP @ HL) decoding, and the HDTV-compatible decoding is performed in accordance with the instruction.
Is output.

If the high-speed rotation flag is not detected,
The data processor 211 instructs the decoding circuit 215 to perform conventional TV (SDTV) compatible decoding. That is, the MPEG2 video decoder 235
Video decoding for TV (MP @ ML) is performed.

The preferred embodiment using a DVD-RAM disk has been described above.
It is not limited to a disk, and may be recorded as a DVD-ROM by a well-known master creation step and a replication step.
Obviously, the present invention can be applied to other optical disks, magneto-optical disks, and magnetic disks in place of the VD disk. When these recording media are used, it goes without saying that an optical disk drive, a magneto-optical disk drive, or a magnetic disk drive is used instead of the DVD drive.

[0096]

As described above, according to the present invention, recording of an HDTV video having a higher transmission rate than that of the current TV is performed by using a current disk recording medium such as a 1 × DVD disc or a DVD-RAM. -There is an effect that reproduction can be performed.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram illustrating an overview of a recording / reproducing system including a recording device, a reproducing device, and a recording medium according to the present invention.

FIG. 2 shows an HDT which is an embodiment of a recording apparatus according to the present invention.
1 is a configuration diagram of a V-compatible DVD disc creation system.

FIG. 3 is an HDT that is an embodiment of a playback device according to the present invention.
1 is a configuration diagram of a V-compatible DVD player system.

FIG. 4 is a configuration diagram of a DVD-RAM drive.

FIG. 5 is a diagram illustrating a relationship between a transmission rate of an encoded signal and a reproduction transmission rate of a reproducing apparatus.

FIG. 6 is a diagram illustrating a file structure of a DVD disc.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Recording apparatus, 2 ... DVD-RAM disk (disk-shaped recording medium), 3 ... Playback apparatus, 11 ... Hard disk, 12
... HDTV elementary stream, 13 ... recording rate storage unit, 14 ... transmission rate detection unit, 15 ... transmission rate comparison unit, 16 ... block replacement unit, 17 ... DVD format unit, 18 ... hard disk, 19 ... DVD format stream, 20 ... DVD-RAM drive, 31
... High speed DVD-ROM drive, 32 ... HDTV compatible MPEG2 decoder, 33 ... HDTV display.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) AC01 AC05 BA06 CA11 CA12 CA20 DA03 5D044 AB05 AB07 BC06 CC04 DE15 DE44 DE52 DE76 DE78 GK08 GK10

Claims (8)

[Claims] 1. A recording rate storage means for storing a recording rate at which a recording capacity per track changes with respect to a radial position of a disk-shaped recording medium, and a code obtained by performing a variable length coding on a material signal. Input means for inputting an encoded signal, and each block constituting the encoded signal in an area of the recording medium where a reproduction rate when the recording medium is reproduced by a predetermined rotation method exceeds a transmission rate of the encoded signal. A recording device, comprising: recording means for recording the information. 2. The recording apparatus according to claim 1, wherein the recording rate is a constant linear recording density on the recording medium. 3. The recording method according to claim 1, wherein the recording rate has a different angular recording density for each radially divided area of the recording medium, and the recording rate is higher on the outer peripheral side than on the inner peripheral side. apparatus. 4. A recording apparatus according to claim 1, further comprising a comparing unit for comparing a recording rate stored in said recording rate storing unit with a transmission rate of an encoded signal inputted from said input unit. 2. The recording apparatus according to claim 1, wherein each block of the encoded signal is interchanged and recorded on the recording medium such that a transmission rate of the encoded signal does not exceed a recording rate of the recording medium. 5. A variable-length encoding unit, further comprising a variable-length encoding unit, wherein when the transmission rate of the encoded signal exceeds a recording rate of the recording medium based on a result of the comparing unit, 5. The recording apparatus according to claim 4, wherein a transmission rate of the encoded signal is reduced by re-encoding at least a part of the material signal or the encoded signal. 6. The recording apparatus according to claim 1, further comprising reproduction order recording means for recording reproduction control information for designating a reproduction order of each block of the coded signal on the recording medium. 7. When reproducing a recording medium on which reproduction control information relating to a rotation speed or a reproduction transmission rate during reproduction is recorded, reproduction control is performed in accordance with the reproduction control information, and reproduction is performed at a reproduction speed higher than a standard speed. A reproducing apparatus characterized by the above-mentioned. 8. A recording medium characterized in that reproduction control information relating to a rotation speed or a reproduction transmission rate during reproduction is recorded so that it can be recognized even by a standard speed reproduction apparatus.