JPH11238310A - Method and device for recording data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitate a mass hard disk drive(HDD) and to record without damaging the quality of images while using an optical information recording medium composed of DVD-RAM and DVD-R elements in a digital versatile disk(DVD) video recording system for performing the real-time encoding and recording of video data and audio data. SOLUTION: The inputted video and audio data are encoded by a DVD encoder 4 and recorded from a pickup 2 for DVD-RAM in the DVD-RAM part of an optical information recording medium 1. After the video and audio data are recorded in the DVD-RAM part, DVD data are read out by the pickup 2 and decoded by a DVD decoder 5. The decoded data are inputted to the DVD encoder 4, encoded with optimum compressibility, finalized and recorded from a pickup 3 for DVD-R in a DVD-R part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording method and a data recording apparatus for recording input data including at least one of video data and audio data using an optical disk having a write-once recording layer and a rewritable recording layer. More particularly, the present invention relates to a data recording method and a data recording apparatus using an optical information recording medium composed of a DVD-RAM and a DVD-R material for real-time encoding and recording of video data and audio data.

[0002]

2. Description of the Related Art MPEG (Moving Picture)
e Image Coding Expert Gro
DVD (Digital Vers.) as an optical disk including video data compressed using the (up) method and navigation data indicating a method of reproducing the video data.
atile disk) has already been released. DVD
For the logical format and DVD playback device,
It is disclosed in detail in Japanese Patent Application Laid-Open No. 8-273304, and is defined as Micro UDF and ISO9660 (hereinafter referred to as “DVD standard”).

On the other hand, as a write-once optical disc which is compatible with DVD and allows a user to record information, DV
There is a DR (DVD-Recordable).

FIGS. 7 and 8 are block diagrams of a conventional DVD video recording system using a DVD-R. In the figure,
Reference numeral 6 denotes a DVD-R disk, 7 denotes a pickup, 8 denotes a hard disk, 4 denotes a DVD encoder, and 5 denotes a DVD decoder. FIG. 7 shows a case where data is directly recorded on the DVD-R disc 6 at a fixed rate. When recording video data and audio data, the DVD encoder 4 encodes the input video data and audio data at a fixed rate, and inputs a modulated signal of the encoded data to the pickup 7. The pickup 7 records the input signal on the DVD-R disc 6 in real time. During playback, DVD-R
The signal read by the pickup 7 from the disk 6 is
The data is decoded by the VD decoder 5 and output to a monitor (not shown).

FIG. 8 shows a case of recording at a variable rate. When recording data, first, video data and audio data are recorded on the large-capacity hard disk 8. After the recording on the hard disk 8 is completed, the video data and the audio data read from the hard disk 8 are encoded at a variable rate by the DVD encoder 4, and the pickup 7 records a modulation signal of the encoded data. At the time of reproduction, DVD
-The signal read by the pickup 7 from the R disk 6 is decoded by the DVD decoder 5 and output to a monitor or the like (not shown).

However, in the system shown in FIG. 7 in which video data and audio data are recorded in real time as DVD video data on a DVD-R disc at a fixed rate, the recording time is shortened when the image quality is prioritized. When the priority is given, there is a problem that the image quality is deteriorated. In addition, the system shown in FIG. 8 that encodes video data in real time at a variable rate into a DVD video format is not only difficult in terms of standards, but also requires a large-capacity hard disk to be built in hardware before recording on a hard disk. However, it was a problem in terms of capacity. Furthermore, the video data and the audio data are converted to DV.
When D-video data is recorded on a DVD-RAM disk, rewriting is possible, but there is also a problem that it cannot be reproduced with a normal DVD drive.

A method of recording data on a DVD-R disc at a variable rate will be described with reference to FIG. In the figure, 41 is a video camera, 42 is an MPEG encoder, 43 is a material file, 44 is a DVD authoring system, 45 is an intermediate recording medium, 46 is a DVD formatter, 47 is a DVD-
An R disk 48 is a recording unit. The video data and audio data captured from the video camera 41 are compressed by the MPEG encoder 42, recorded in the memory as a material file 43, and created by the DVD authoring system 44 in the same file as logical data conforming to the DVD standard. . The created file is stored in the intermediate medium 45.
Once, and after all the files have been collected, the DV
The D formatter 46 converts these files to DV format.
The file is converted into the same file as the logical format conforming to the D standard, and the DVD-R disc 47
Recorded above. As described above, after all the files have been prepared, a process of converting these files into the same file as the logical format conforming to the DVD standard and recording the same is required, so that the reproduction time of the recorded data is at least twice as long. Time is needed.

The reason why such a process is necessary will be described. The data unit to be reproduced includes a plurality of data pack sequences obtained by compressing content data including at least one of audio information, main video information, and sub-video information by the MPEG2 method and packetizing the data data, and is arranged at the head of the data pack sequence The content data is reproduced on the basis of the navigation data in which navigation data indicating a reproduction method of each data pack is stored.

[0009] This set of data units is called a data cell, and the data cells are reproduced continuously in time series. Further, it also has navigation data having a table in which cell reproduction information relating to data cell reproduction is described.

[0010] One video stream has at least one
A set of the above data cells is called a video object (VOB). A storage of at least one VOB having a common attribute is called a video object set (VOBS). Video title set information (VT) having information for reproducing this VOBS, etc.
SI) and its backup information (VTSI_B)
UP) are arranged before and after each VOBS to form one video title set (VTS).

A maximum of 99 video title sets can be arranged on an optical disk, and a video manager (VMG) having information for managing each video title set.
Is placed at the head of the video title set group.

As described above, until all the video title sets to be recorded on the DVD-R are determined, the VMG is not determined and cannot be recorded. A DVD-R on which no VMG is recorded cannot be played back by a DVD playback device.

Therefore, a video tape recorder (VT)
R) and video movies, in order to realize a function of recording TV programs one after another, recording commemorative pictures one after another, and playing back each time, a hard disk drive (HDD) is provided in the recording device. )), It is necessary to incorporate an intermediate medium, but there is a drawback that the apparatus becomes large-scale. Also, for applications such as portable video movies, there is a disadvantage that the HDD is vulnerable to vibration,
There is a problem that practical application is difficult.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and provides a system configuration using an optical information recording medium having a write-once recording layer and a rewritable recording layer to reduce the image quality of an image. It is an object of the present invention to provide a data recording method and a data recording apparatus which can perform recording without loss and do not require a large-capacity HDD.

[0015]

According to a first aspect of the present invention, an optical disk having a write-once recording layer and a rewritable recording layer is used to record input data including at least one of video data and audio data. In the data recording method, after compressing the input data and recording the data on the rewritable recording layer, reproducing the data recorded on the rewritable recording layer, compressing the data to a higher compression data, and recording the data on the additional recording layer. It is characterized by recording.

According to a second aspect of the present invention, there is provided a DVD-RAM
And a data recording method using an optical information recording medium composed of a DVD-R material, wherein input data including at least one of video data and audio data is converted to D data.
After encoding by a VD encoder and recording on the DVD-RAM section, the recorded data on the DVD-RAM section is reproduced, and the compression rate is optimized to record on the DVD-R section. is there.

According to a third aspect of the present invention, in the data recording method according to the second aspect, the DVD encoder comprises:
When recording on a DVD-R unit, encoding at a variable rate is possible.

According to a fourth aspect of the present invention, in the data recording apparatus, data input means for inputting input data including at least one of video data and audio data, and the input data is compressed at a low compression rate at a fixed transfer rate. A first data compression unit for performing recording and reproduction of input data compressed by the first data compression unit on a rewritable recording layer of an optical information recording medium; Data expansion means for expanding the expanded data, and a second means for compressing the data expanded by the data expansion means at an optimal compression rate at a variable transfer rate.
Data compression means, data storage means for storing data compressed by the second data compression means, and data for adding navigation data to the data stored by the data storage means and converting the data into a predetermined format Formatting means, data recording means for recording data converted into a format predetermined by the data formatting means on an additional recording layer of an optical information recording medium, the signal input means, the first data compression means, Data recording / reproducing means, the second data compression means, the data storage means, the data formatting means, a control means for controlling the data recording means, and an operation means for inputting command information to the control means. It is characterized by the following.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical information recording medium used in the present invention has a write-once recording layer and a rewritable recording layer. The configuration and manufacturing method of an example of the optical information recording medium will be described.

FIG. 6 is a sectional view of an example of the optical information recording medium of the present invention. In the figure, 31 is a substrate, 32 is a dye recording thin film, 33 is a reflective film, 34 is a substrate, 35 is a dielectric protective film,
36 is a phase change recording thin film, 37 is a dielectric protective film, 38 is a reflective film, and 39 is an adhesive layer.

The substrates 31 and 34 are made of polycarbonate, P
A transparent material such as a plastic material such as MMA, polyolefin, or epoxy resin or a glass plate is used. As the dye recording thin film 32, a thin film of an organic dye such as a cyanine dye, a phthalocyanine dye, or an azo dye is used, and the maximum absorption wavelength (λ _max ) of the dye is determined by setting the wavelength of the recording laser to 635 to 66.
If it is 0 nm, 550-600 nm is desirable. The dye film is formed by a spin coating method. The reflection film 33
The thin film is made of gold, silver, copper, aluminum, chromium, nickel, or an alloy thereof, and has a reflectance of about 70%. The reflection film 33 is formed by a sputtering method or a vacuum evaporation method. The reflection film 38 is also made of gold, silver, copper, aluminum, chromium, nickel, or an alloy thereof, and is formed by a sputtering method or a vacuum evaporation method. The dielectric protection films 35 and 37 are made of Si ○, SiO
₂ , an oxide such as TaO ₂ , a nitride such as SiN or AlN, a sulfide such as ZnS, or a mixture thereof is formed by a sputtering method, a vacuum evaporation method, or an electron beam method. The phase-change recording thin film 36 is made of a material typified by germanium antimontel (GeSbTe) or silver indium antimontel (AgInSbTe), and includes chromium, cobalt, selenium, tin, lead,
Platinum, palladium, etc. may be contained. The phase change recording thin film 36 is also formed by a sputtering method or a vacuum evaporation method. The adhesive layer 39 is made of an ultraviolet curable resin (UV resin), an adhesive sheet, or the like.

The manufacturing method is such that a dye recording thin film 32 and a reflection film 33 are laminated on a substrate 31 and a dielectric protection film 35, a phase change recording thin film 36 and a dielectric protection film 37 are formed on a substrate 34. , And a reflection film 38 are laminated on each other with an adhesive layer 39 interposed therebetween.

A specific example will be described. First, polycarbonate substrates 31 and 34 having guide grooves are formed by injection molding. Here, the track pitch of the guide groove is different between the substrates 31 and 34, and the track pitch of the substrate 31 on which the dye recording thin film 32 is formed is narrower than the track pitch of the substrate 34. For example, the track pitch of the substrate 31 is 0.8 μm, and the track pitch of the substrate 34 is 1.48 μm. The shape of the guide groove is
For example, the groove width is 0.4 μm and the groove depth is 0.15 μm. In the substrate 34, the groove width is 0.74 μm and the groove depth is 30.
nm.

Next, a dye recording thin film 32 is formed on the substrate 31 by spin coating. Using a cyanine dye dissolved in an alcoholic organic solvent, a film thickness of 100 to 20
The film is formed to have a thickness of 0 nm. A reflective film 33 is formed thereon by a sputtering method. The reflective film 33 is made of gold and has a thickness of about 80 n so that the reflectivity is 45% or more.
m. On the other hand, a dielectric protection film 35, a phase change recording thin film 36, a dielectric protection film 37, and a reflection film 38 are successively formed on the substrate 34 by sputtering. Aluminum is used for the reflection film 38, and the film thickness is set to 70 nm. ZnS—SiO ₂ (20 mol) is used for the dielectric protection films 35 and 37.
%), And the film thicknesses are 40 nm and 120 nm, respectively. The phase change recording thin film 36 is made of silver indium antimony (AgInSbTe) and has a thickness of 20 to 25.
is deposited to a thickness of nm. After that, using UV curable resin, UV
Substrates 31 and 34 formed by resin bonding, respectively.
Are bonded so that the film forming surface is on the inside.

The above-described optical information recording medium has a configuration in which both a rewritable recording layer and a write-once recording layer are recorded and reproduced from both sides.
The configuration may be such that reproduction is possible, or a configuration in which a rewritable recording layer and a write-once recording layer are formed separately in the radial direction.

FIG. 1 is a block diagram showing a configuration of a DVD video recording system according to an embodiment of the present invention. In the figure, 1 is a two-layer DVD disc composed of DVD-RAM and DVD-R materials, and 2 is a DVD-RA
Pickup for M, 3 for DVD-R, 4
Is a DVD encoder, and 5 is a DVD decoder.

Here, video data is stored on a two-layer DVD disc 1 in which the first layer is made of DVD-RAM (phase change recording thin film) and the second layer is made of DVD-R (organic dye-based recording thin film). The operation when recording as video data will be described with reference to the recording processing flowchart of FIG.

First, when video and audio data are input (S1), the DVD encoder 4 encodes the DVD data (S2). Specifically, it separates video data and audio data,
Each is digitally converted to a format conforming to the DVD video standard. Since encoding must be performed in real time, a format is often adopted in which the transfer rate of encoded data is fixed and the data is embedded in a prescribed format. DV of double-layer DVD disc 1
To avoid image quality deterioration when recording to D-RAM,
The encoder 4 performs encoding with low compression to generate DVD video data.

In parallel with the above processing, DVD video data encoded at a fixed rate is passed through a DVD-RAM pickup 2 having a wavelength recordable on a DVD-RAM (phase-change recording thin film) of a dual-layer DVD disc 1. , DVD-R
Temporarily recorded in the AM section (S3).

Next, recording on the DVD-R is performed. DVD data is temporarily stored in the DVD-RAM part
Read through the VD-RAM pickup 2 (S
4). The read DVD data is stored in a DVD decoder 5
Is decoded (S5), and the decoded video data is input to the DVD encoder 4 at the subsequent stage (S6).
When performing DVD variable rate encoding in S5 to S6, if there is difficulty in real-time encoding,
Although not shown, a buffer memory may be required because the transfer rate must be adjusted by an I / F between the D decoder 5 and the DVD encoder 4. The buffer memory amount is set depending on the processing capacity of the DVD encoder 4.

The DVD encoder 4 performs encoding according to the compression rate corresponding to the optimum transfer rate value stored during the temporary recording (S6). Encoding at the optimum compression rate here means generating DVD data at a variable rate. As a result, it is possible to avoid a problem that the recording time is shortened because the image quality is prioritized without visually deteriorating the image quality. Then, the DVD data generated at the optimum transfer rate is finalized and recorded on the DVD-R from the DVD-R pickup 3 having a wavelength recordable on the DVD-R (organic dye-based recording thin film) (S).
7).

As described above, in the two-layer DVD disc 1, by re-recording from the DVD-RAM section to the DVD-R section, reproduction by a normal DVD drive becomes possible.

In this embodiment, the DVD-RA
Although the optical information recording medium composed of the M and DVD-R materials has been described as a two-layer disk, a disk in which a part of the single-layer disk which is a DVD-R material is a DVD-RAM material may be used. . In this embodiment, a recording method using two types of pickups has been described. However, in the case of an optical information recording medium configured to perform recording / reproduction from one side, a single bifocal pickup may be used. Good. In this case, a buffer memory may be prepared as appropriate, and reading and writing may be performed alternately.

FIG. 3 illustrates the fixed-rate encoding and the variable-rate encoding of MPEG video data. MPE
In the G encoding method, image data is compressed in a certain group unit along the time axis. As shown in FIG. 3A, a method of compressing all video data groups at the same compression rate is called a fixed rate encoding method.
As shown in (B), a system that does not always compress at the same compression ratio for each group is called a variable rate encoding system.
Normally, variable rate coding is based on human visual effects,
In the case of an image having a large amount of data, the compression is performed at a low compression rate. As a result, the total data amount can be adjusted, and thus the total recording time can be adjusted.

Therefore, in S2, the data of the transfer rate or the compression rate is used as the reference data in the temporary storage of S3 so that the DVD data can be encoded and the optimum encoding can be performed later at a variable rate. It can be stored. Then, in S6, when performing the optimal compression, the encoding is performed according to the optimal transfer rate value or the compression rate corresponding to the value of the compression rate based on the reference data stored at the time of the temporary recording. You can do so.

FIG. 4 is a diagram showing a schematic configuration of an embodiment of the optical information recording medium recording apparatus according to the present invention. In the figure,
11 is signal input means, 12 is first data compression means, 1
3 is a data recording / reproducing means, 14 is a data decompression means, 15
Is the second data compression means, 16 is the data storage means, 17
Is data format means, 18 is data recording means, 1
9 is a control means, 20 is an operation means, and 21 is an optical information recording medium.

When content data such as a video signal and an audio signal is input from the signal input means 11, the content data is fixed by the first data compression means 12 (MPEG encoder) at a fixed transfer rate (a fixed amount of information per unit time). ), And is recorded on the rewritable recording layer of the optical information recording medium 21 by the data recording / reproducing means 13. The low-compression-ratio content data recorded on the rewritable recording layer is reproduced by the data recording / reproducing means 13 and decompressed by the data decompressing means 14 (MPEG decoder). The content data decompressed by the data decompression means 14 is compressed by the second data compression means 15 to an optimal compression rate at a variable transfer rate (variable information amount per unit time).

The content data compressed at the optimum compression rate by the second data compression means 15 is input to the data storage means 16 for adjusting the transfer rate, and after being delayed for a certain time, to the data format means 17. Is entered. The data format means 17 adds various kinds of navigation data to convert the content data into a logical format that can be reproduced by a DVD reproducing device.

The content data output from the data formatting means 17 is transmitted to the data recording means 18 by the data recording means 18.
The information is recorded on the write-once recording layer of the optical information recording medium 21. At this time, the data recording unit 18 is controlled by the control unit 19 to secure areas for recording the lead-in area, the volume and file structure area, and the video manager area, and the navigation data is sequentially added immediately after that. The content data (VTS) is recorded.

FIG. 5 is an explanatory diagram of a recording method in the additional recording layer. FIG. 5A shows a state in which areas for recording the above-described lead-in area, volume and file structure area, and video manager area are secured.
5B, 5C, and 5D show VTS1, VTS2,
.. And VTS are sequentially recorded. And after recording the last VTS, VTSn,
Perform finalization recording. In the finalization recording, the lead-out area (LO) is recorded as shown in FIG. 3Q (E), and the VTS is recorded as shown in FIG. 3Q (F).
Of video manager data (VM
G), and as shown in FIG. 3Q (G), information (FS) on the volume and file structure area for all data recorded on the disc is recorded, between the video manager area and the volume and file structure area. Is recorded as 0. Lastly, as shown in FIG. 3Q (H), the lead-in data (LI) corresponding to the data capacity recorded on the disc is recorded in the lead-in area.

Before finalizing recording on the additionally recordable recording layer, temporary lead-out data, lead-in data, video manager data, and the like are recorded on the rewritable recording layer. Information already recorded on the additional recording layer can be reproduced. However, at this point, the data cannot be reproduced by the existing DVD reproducing device, but can be reproduced by the optical information recording medium recording device of the present invention.

Further, since the optical information recording medium of the present invention on which the finalized recording has been performed has compatibility with DVD-R, it can be reproduced by an existing DVD reproducing apparatus.

[0043]

As is apparent from the above description, according to the present invention, an optical information recording medium comprising a write-once recording layer (or DVD-R) and a rewritable recording layer (or DVD-RAM) is used. By performing tentative recording with low compression on the rewritable recording layer at the time of recording, and finally finalizing recording on the additional recording layer with the optimal compression ratio, the recording time is optimally recorded without impairing the image quality of the recorded video There is an effect that can be. Further, since all recording is performed in one disk, there is an effect that a large capacity HDD becomes unnecessary.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a DVD video recording system according to an example of an embodiment of the present invention.

FIG. 2 is a flowchart of a DVD video recording process in FIG.

FIG. 3 is an explanatory diagram of fixed-rate encoding and variable-rate encoding of MPEG video data.

FIG. 4 is a diagram showing a schematic configuration of an example of an embodiment of an optical information recording medium recording apparatus of the present invention.

FIG. 5 is an explanatory diagram of a recording method for a write-once recording layer.

FIG. 6 is a sectional view of an example of the optical information recording medium of the present invention.

FIG. 7 is a block diagram of an example of a conventional DVD video recording system using a DVD-R.

FIG. 8 is a block diagram of another example of a conventional DVD video recording system using a DVD-R.

FIG. 9 is an explanatory diagram of a method of recording on a DVD-R disc at a variable rate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Double-layer DVD disk, 2 ... DVD-RAM pickup, 3 ... DVD-R pickup, 4 ... DVD encoder, 5 ... DVD decoder, 6 ... DVD-R disk, 7 ... Pickup, 8 ... Hard disk, 11 ... Signal input means, 12 first data compression means, 13 data recording / reproduction means, 14 data expansion means, 15 second data compression means, 16 data storage means, 17 data format means, 18 data Recording means 19 control means 20 operating means 21 optical information recording medium 31
Substrate, 32: Dye recording thin film, 33: Reflective film, 34: Substrate, 35: Dielectric protective film, 36: Phase change recording thin film, 37
... a dielectric protection film, 38 ... a reflection film, 39 ... an adhesive layer.

Claims (4)

[Claims] 1. A data recording method for recording input data including at least one of video data and audio data using an optical disk having a write-once recording layer and a rewritable recording layer, wherein the input data is compressed. Recording the data on the rewritable recording layer, and then reproducing the data recorded on the rewritable recording layer, compressing the data to higher compression data, and recording the data on the additional recording layer. 2. A data recording method using an optical information recording medium comprising a DVD-RAM and a DVD-R material, wherein input data including at least one of video data and audio data is encoded by a DVD encoder. -A data recording method characterized by reproducing data recorded in the DVD-RAM part after recording in the RAM part, optimizing the compression ratio and recording the data in the DVD-R part. 3. The data recording method according to claim 2, wherein the DVD encoder is capable of encoding at a variable rate when performing recording on a DVD-R unit. 4. Data input means for inputting input data including at least one of video data and audio data;
First data compression means for compressing the input data at a low compression rate at a fixed transfer rate, and recording and reproducing the input data compressed by the first data compression means on a rewritable recording layer of an optical information recording medium. Data recording / reproducing means, data decompressing means for decompressing the data reproduced by the data recording / reproducing means, and second data compressing means for compressing the data decompressed by the data decompressing means at an optimal compression rate at a variable transfer rate. Data storage means for storing data compressed by the second data compression means, data format means for adding navigation data to the data stored by the data storage means and converting the data into a predetermined format; The data converted into a predetermined format by the data format means is written in optical information. A data recording unit for recording on a write-once recording layer of a medium, the signal input unit, the first data compression unit, the data recording / reproducing unit, the second data compression unit, the data storage unit, the data format unit, and A data recording apparatus comprising: a control unit that controls the data recording unit; and an operation unit that inputs command information to the control unit.