WO2005109874A1

WO2005109874A1 - Information recording device and method, information reproducing device and method, and computer program

Info

Publication number: WO2005109874A1
Application number: PCT/JP2005/008160
Authority: WO
Inventors: Kenji Yamagata; Hiroshi Nakamura; Kyotaro Sato; Kenichiro Tada; Tomohiro Miura; Toshiro Tanikawa; Ken Miyagawa; Takashi Aoki; Shinya Hashimoto; Shinsuke Nishimura
Original assignee: Pioneer Corporation
Priority date: 2004-05-07
Filing date: 2005-04-28
Publication date: 2005-11-17
Also published as: JP4633715B2; JPWO2005109874A1

Abstract

An information recording device (1) is provided with a down-converting means (32) for down-converting first contents information of a first reproduction quality (HD) recorded in a first recording medium (10) and for generating second contents information of a low-definition second reproduction quality (SD), a first recording means (21) for recording the second contents information in a second recording medium (20), a deleting means (11) for deleting the first contents information recorded in the first recording medium when the second contents information is to be recorded in the second recording medium, and a differential means (38) for generating difference information which indicates a difference between third contents information and the first contents information. The third contents information is of the second reproduction quality, having a pixel size relating to the first reproduction quality generated by up-converting the second contents information.

Description

Information recording apparatus and method, information reproducing apparatus and method, and computer program

The present invention relates to a technical field of an information recording device and method such as a DVD recorder and a DVD player, an information reproducing device and method, and a computer program for causing a computer to function as such an information recording device and the like.

Background art

[0002] At present, terrestrial digital broadcasting, BS digital broadcasting, and the like have been started, and an environment is being prepared so that high-quality digital broadcasting can be viewed even at home. In such digital broadcasting, so-called standard broadcasting (hereinafter, referred to as SD (Standard Definition)) or content information having the quality of SDTV, HDTV broadcasting (hereinafter, referred to as HD (High Definition)) or HDTV It is possible to view content information having high quality.

[0003] On the other hand, since the content information broadcast by such digital broadcasting is digital data, it is possible to easily make a copy without deteriorating the image quality even by duplication. For this reason, copying digital data (or content information related to digital broadcasting) poses a problem in terms of copyright protection. Various copyright protection technologies have been developed to realize such copyright protection (see Patent Documents 1 to 3). In particular, CPPM (Content Protection for Prerecorded Media) and CPRM (Ontent Protection for Recording Media), which are used in DVDs and other recording media, and the 7th copyright protection technology are technologies to prevent unauthorized copying. For example, the copyright of content information is appropriately protected by restricting the content information to copy once.

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-324443

Patent Document 2: Japanese Patent Application Laid-Open No. 2000-298926

Patent Document 3: JP-A-9171658 Disclosure of the invention

Problems to be solved by the invention

[0005] In Japan, terrestrial digital broadcasting and BS digital broadcasting, which are currently being broadcasted since April 2004, have the power of copyright protection. All programs (content information) that are broadcast are copied. You will be subject to once restrictions.

[0006] Due to this copy once restriction, for example, when transferring content information recorded on a hard disk to another recording medium such as a DVD, only the so-called MOVE operation of erasing the original content information recorded on the hard disk is performed. It becomes possible. For example, some users may want to record HD content information on a hard disk at home and then record this content information on a DVD or the like and watch it on the go. In this case, a MOVE operation is performed in which the HD content information recorded on the hard disk is recorded as SD content information on a DVD or the like, and the HD content information recorded on the hard disk is deleted. This MOVE operation makes it possible to record the content information subject to copy once restrictions on another recording medium while appropriately protecting the copyright of the content information.

[0007] At this time, even if the user wants to view the HD content information again, only the SD content information remains at hand, and the user cannot view the HD content information. Have a point. Such problems not only hinder the spread of digital broadcasting, but may also reduce the appeal of information devices such as hard disk recorders by half.

[0008] The present invention has been made in view of, for example, the above-described conventional problems. For example, it is possible to appropriately view HD and SD content information while suitably protecting copyright. It is an object of the present invention to provide an information recording apparatus and method, an information reproducing apparatus and method, and a computer program for causing a computer to function as such an information recording apparatus.

Means for solving the problem

[0009] (Information recording device)

In order to solve the above problems, the information recording device of the present invention has been recorded on a first recording medium. Down-conversion means for down-converting the first content information of the first reproduction quality to generate second content information of the second reproduction quality with a lower definition than the first reproduction quality; and First recording means for recording content information, and first erasing means for erasing the first content information recorded on the first recording medium when the second content information is recorded on the second recording medium. Indicates a difference between the third content information of the second reproduction quality having a pixel size related to the first reproduction quality and generated by up-converting the second content information, and the first content information. And difference means for generating difference information.

[0010] According to the information recording apparatus of the present invention, the first content information relating to the first reproduction quality (HD) recorded on the first recording medium is down-compensated by the operation of the down-conversion means, Second content information related to the second reproduction quality (SD) is generated. At this time, since the second playback quality has lower definition than the first playback quality, the data size of the second content information is smaller than the data size of the first content information. Then, the generated second content information is recorded on the second recording medium by the operation of the first recording means.

On the other hand, after the second content information is recorded on the second recording medium, the first content information recorded on the first recording medium is erased by the operation of the first erasing means. Thereby, the copyright of the content information can be protected.

[0012] In the present invention, in particular, difference information indicating a difference between the first content information and the third content information is generated by the operation of the difference means. The third content information has the same pixel size (or the number of pixels) but a different image quality (that is, reproduction quality) as compared with the first content information. The third content information can be relatively easily generated by up-converting the second content information. The difference information indicates a difference between the first content information and the third content information. Therefore, the first content information or content information corresponding to the first content information can be generated by complementing the third content information based on the difference information. Here, “content information equivalent to the first content information” means that the image quality (playback quality) is equivalent to the first playback quality (or has higher definition than the second playback quality). Content that can be recognized The purpose is to indicate the information. In addition, the difference information is not information indicating the content information itself, but is subjected to data processing and the like together with the third content information. Information).

[0013] Therefore, while the copyright of the content is appropriately protected, the user can convert the content information once down-converted to the second reproduction quality and recorded on another recording medium again based on the difference information. It can be viewed as content information related to the first playback quality. That is, for example, after a relatively high-definition digital broadcast program is recorded on the first recording medium, the program is down-converted into a relatively low-definition program and recorded on the second recording medium. Can be viewed again as a relatively high-definition program. Of course, it can also be viewed as a low-definition program.

[0014] As a result, according to the information recording apparatus of the present invention, while protecting the copyright of the content, the user can obtain the desired reproduction quality (for example, the first reproduction quality or the HD quality corresponding to the HD quality described later). It is possible to suitably view content information related to (second playback quality corresponding to SD image quality described later).

[0015] One embodiment of the information recording apparatus of the present invention further includes a second recording unit that records the difference information on the first recording medium.

According to this aspect, it is possible to appropriately perform various operations described below (in particular, a conversion operation of the reproduction quality of the third content information) using the difference information recorded on the first recording medium.

[0017] In another aspect of the information recording apparatus of the present invention, the second content information is up-converted to generate the third content information, and the third content information is generated based on the difference information. A conversion unit for converting the reproduction quality of the third content information from the second reproduction quality to the first reproduction quality.

According to this aspect, the reproduction quality of the third content information is obtained by using the difference information and the third content information generated by up-converting the second content information recorded on the second recording medium. Can be converted to the first playback quality. That is, it is possible to generate the first content information having a higher definition reproduction quality (or content information corresponding to the first content information). Therefore, even if the first content information is once converted to the second content information and recorded on another recording medium, the user can convert the second content information to high definition. It can be viewed again as the first content information.

[0019] In the aspect of the information recording device including the up-converting means and the generating means as described above, the third recording means for recording the third content information converted into the first reproduction quality on the first recording medium, When the converted third content information is recorded on the first recording medium, the apparatus further comprises a second erasing means for erasing the second content information recorded on the second recording medium. You can.

With this configuration, the third content information converted to the first reproduction quality is recorded again on the first recording medium, and the second content recorded on the second recording medium by the operation of the second erasing means. 2 Since the content information is erased, even if the first content information is once converted to the second content information and recorded on another recording medium, the first content is protected while the copyright of the content is appropriately protected. Information and the like can be recorded again on the original recording medium.

[0021] (Information recording method)

In order to solve the above-mentioned problems, the information recording method of the present invention downconverts first content information having a first reproduction quality recorded on a first recording medium, and converts the first content information having a lower definition than the first reproduction quality. (2) a down-conversion step of generating second content information of playback quality; a first recording step of recording the second content information on a second recording medium; and the second content information being recorded on the second recording medium. The first content information recorded on the first recording medium, a first erasing step of erasing the first content information, and a pixel size related to the first reproduction quality generated by up-converting the second content information. A difference step of generating difference information indicating a difference between the third content information having the second playback quality and the first content information.

According to the information recording method of the present invention, various benefits similar to those of the above-described information recording apparatus of the present invention can be enjoyed.

Incidentally, in response to the various aspects of the information recording apparatus of the present invention described above, the information recording method according to the present invention can also adopt various aspects.

(Information reproducing device)

In order to solve the above-mentioned problems, the information reproducing apparatus of the present invention has the above-mentioned information recording apparatus of the present invention (including its various aspects). An information reproducing apparatus that reproduces content information with a desired reproduction quality, comprising: an up-converting unit that up-converts the second content information to generate the third content information; and And a first reproducing means for converting the reproduction quality of the generated third content information from the second reproduction quality to the first reproduction quality and reproducing the same.

According to the information reproducing apparatus of the present invention, the difference information and the second content information recorded on the second recording medium (specifically, the third content generated by up-converting the second content information) It is possible to generate higher-definition first content information (or content information corresponding to the first content information) using the content information). Therefore, even if the first content information is once converted to the second content information and recorded on another recording medium, the user can view the second content information again as the high-definition first content information. Become.

[0026] As a result, according to the information reproducing apparatus of the present invention, while appropriately protecting the copyright of the content, the user can obtain the content information relating to the desired reproduction quality (particularly, the first reproduction quality). Can be suitably viewed.

[0027] One embodiment of the information reproducing apparatus of the present invention further comprises a second reproducing means for reproducing the second content information.

[0028] According to this aspect, the user can appropriately view the second content information.

(Information reproduction method)

In order to solve the above-mentioned problems, the information reproducing method of the present invention includes a method for transmitting the second content information recorded on the second recording medium by the above-described information recording apparatus of the present invention (including its various aspects). An information reproducing method for reproducing at the reproduction quality of the second content information, wherein the up-conversion step of up-converting the second content information to generate the third content information; and A first reproduction step of converting the reproduction quality of the third content information to be reproduced from the second reproduction quality to the first reproduction quality.

According to the information reproducing method of the present invention, various types of information similar to those of the above-described information reproducing apparatus of the present invention are provided. You can enjoy the benefits.

[0031] Incidentally, in response to the various aspects of the information reproducing apparatus of the present invention described above, the information reproducing method according to the present invention can also adopt various aspects.

[0032] (Computer program)

A first computer program according to the present invention causes a computer to function as the above-described information recording device (including its various forms) in order to solve the above problems. A second computer program according to the present invention causes a computer to function as the above-described information reproducing apparatus (including its various forms) in order to solve the above problems.

According to the first or second computer program according to the present invention, the first or second computer program is stored in a storage medium such as a ROM, a CD-ROM, a DVD-ROM, or a hard disk that stores the computer program. If the program is read and executed by a computer, or if the first or second computer program is downloaded to a computer via communication means and executed, the above-described information recording apparatus or information of the present invention is provided. A playback device can be realized relatively easily.

[0034] Incidentally, in response to the various aspects of the above-described information recording apparatus or information reproducing apparatus of the present invention, the first or second computer program of the present invention can also adopt various aspects.

[0035] In order to solve the above-mentioned problem, the first computer program product in the computer-readable medium clearly embodies a computer-executable program instruction, and stores the computer in the information recording apparatus of the present invention. Function (including its various aspects)

[0036] In order to solve the above-mentioned problem, the second computer program product in the computer-readable medium explicitly embodies a program instruction executable by a computer, and converts the computer into an information reproducing apparatus according to the present invention. Function (including its various aspects)

According to the first or second computer program product of the present invention, the computer program product can be transferred to a computer from a storage medium such as a ROM, a CD-ROM, a DVD-ROM, or a hard disk that stores the computer program product. If you read, or an example For example, if the computer program product is converted into a transmission signal of a predetermined communication method and downloaded to a computer via communication means, the above-described information recording device or information reproducing device of the present invention can be relatively easily implemented. . More specifically, the computer program product may be constituted by computer-readable codes (or computer-readable instructions) that function as the above-described information recording device or information reproducing device of the present invention.

[0038] These effects and other advantages of the present invention will become more apparent from the following embodiment.

As described above, according to the information recording apparatus or method of the present invention, down-converting means, first recording means, first erasing means and difference means, or down-converting step, first recording step, first recording step, An erasing step and a difference step are provided. Further, according to the information reproducing apparatus or method of the present invention, it is provided with an up-conversion means and a first reproducing means, or an up-conversion step and a first reproducing step. Therefore, the user can suitably view the content information relating to the desired reproduction quality while protecting the copyright of the content.

Brief Description of Drawings

FIG. 1 is a block diagram conceptually showing a basic configuration of an embodiment according to an information recording / reproducing apparatus of the present invention.

FIG. 2 is a flowchart conceptually showing a flow of a MOVE operation of the information recording / reproducing apparatus according to the embodiment.

FIG. 3 is a block diagram that extracts constituent elements related to a MOVE operation among constituent elements of the information recording apparatus according to the embodiment.

FIG. 4 is an explanatory diagram conceptually showing data recorded on a hard disk and an optical disk during a MOVE operation.

FIG. 5 is a flowchart conceptually showing a flow of an HD image quality image reproducing operation and a MOVE BACK operation (HD) after the MOVE operation of the information recording / reproducing apparatus according to the embodiment.

FIG. 6 is a block diagram of components of the information recording apparatus according to the present embodiment, which are related to a playback operation of an HD image quality image after a MOVE operation and a MOVE BACK operation (HD). FIG. 7 is a flowchart conceptually showing a flow of an SD quality image reproducing operation and a MOVE BACK operation (SD) after the MOVE operation of the information recording / reproducing apparatus according to the embodiment.

FIG. 8 is a block diagram of constituent elements of the information recording apparatus according to the present embodiment, which are related to the SD image quality image reproducing operation and the MOVE BACK operation (SD) after the MOVE operation.

FIG. 9 is a flowchart conceptually showing a flow of an HD quality video image reproducing operation after the MOVE BACK operation (HD) of the information recording / reproducing apparatus according to the embodiment.

FIG. 10 is a block diagram of components of the information recording apparatus according to the present embodiment, which are extracted from components related to a reproduction operation of an HD quality image after a MOVE BACK operation (HD).

Explanation of symbols

[0041] 1 Information recording / reproducing device

10 Hard Disk

11 Hard disk drive

20 optical disk

21 Optical Disk Drive

32 Down converter

37 Upconverter

38 Difference circuit

42 Adder circuit

50 CPU

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode for carrying out the present invention will be described for each embodiment in order with reference to the drawings. (Basic configuration)

First, with reference to FIG. 1, the basic configuration of an embodiment of the information recording / reproducing apparatus (information recording apparatus or information reproducing apparatus) of the present invention will be described. Here, FIG. 1 is a block diagram conceptually showing a basic configuration of the information recording / reproducing apparatus according to the present embodiment.

As shown in FIG. 1, the information recording / reproducing apparatus 1 is configured to be able to record data on each of a hard disk 10 and an optical disk 20, and includes a hard disk drive 11 and an optical disk drive. Live 21, HD (High Definition) decoder 31, Down converter 32, SD (Standard Definition) encoder 33, CPRM (Content Protection for Recordable Media) circuit 34, Frame memory 35, SD decoder 36, Up converter 37, Difference circuit 38 , Compression circuit 39, expansion circuit 40, HD encoder 41, calorie calculation circuit 42, CPU 50, memory 51

The hard disk 10 is a specific example of the “first recording medium” in the present invention, and is a magnetic recording medium on which various data can be recorded. It has a larger recording capacity.

The hard disk drive 11 is a specific example of the “second recording device”, the “third recording device”, or the “first erasing device” in the present invention, and is capable of recording or erasing various data on the hard disk 10. Is configured.

The optical disc 20 is a specific example of the “second recording medium” in the present invention, and is, for example, a DV.

It is an information recording medium that has a disc-like shape with a diameter of 12 cm, such as D.

In particular, the optical disc 20 used in the information recording / reproducing apparatus 1 according to the present embodiment is a rewritable optical disc (for example, DVD-RW or the like) compatible with CPRM.

The optical disk drive 21 is a specific example of “first recording means” or “second erasing means” in the present invention, and is configured to be capable of recording or erasing various data on the optical disk 20.

[0049] HD decoder 31 is configured to be able to decode an HD stream. That is, by decoding an MPEG2 compressed (encoded) HD stream, data relating to an HD image quality video, which is a specific example of the “first content information” in the present invention, can be generated.

The down-converter 32 is a specific example of “down-conversion means” in the present invention, and converts data related to an HD-size (1920 pixels × 1080 pixels) video into an SD-size (720 pixels × 480 pixels) video. It is configured to be convertible to the data according to.

In the present embodiment, when the video is simply distinguished from the aspect of the number of pixels, the video is referred to as an HD size video or an SD size video as described above. In addition, an image that has the number of pixels equivalent to an HD-size image and that actually achieves HD A distinction is made especially with the term image. In addition, an image having the number of pixels corresponding to an SD-size image is referred to as an SD-quality image in some cases.

[0052] The SD encoder 33 is configured to be capable of MPEG2 compression (encoding) of data relating to SD-size video converted by the downconverter. Then, after being subjected to the MPEG2 compression, an SD stream is generated.

[0053] The CPRM circuit 34 performs encryption and decryption of various data (or streams) recorded on the optical disc 20 for copy protection according to the CPRM.

[0054] The frame memory 35 is configured to be able to store data related to HD image quality video generated by the operation of the HD decoder 31. In particular, by storing data relating to HD image quality video in the frame memory 35, the data can be output to the difference circuit 38 at a desired timing.

[0055] The SD decoder 36 is configured to be able to decode an SD stream. That is, the M-PEG2 compressed (encoded) SD stream is decoded, and the data relating to the SD size video as one specific example of the “second content information” in the present invention (that is, the data relating to the SD quality video) Can be generated.

The up-converter 37 is a specific example of “up-conversion means” in the present invention, and is configured to be able to convert data relating to SD-size video into data relating to HD-size video.

The difference circuit 38 is a specific example of the “difference means” in the present invention, and is configured to convert the HD image data output from the frame memory 35 and the HD size image output from the up-converter 37. It is configured to be able to generate difference data indicating the difference from such data

[0058] The compression circuit 39 is configured to be able to compress the difference data generated by the difference circuit 38. The compression method (or compression algorithm) used here is preferably a method capable of reversible compression, more preferably because various methods such as a run length compression method (Run Length method) can be used. preferable. That is, it is preferable that the compression method is such that the data obtained by expanding the compressed data and the original data of the compressed data are the same. That's right.

The expansion circuit 40 is configured to be able to expand (or decompress) the compressed difference data. Here, if the data is compressed by the compression method capable of reversible compression in the compression circuit 39, the data output from the expansion circuit 40 matches the data input to the compression circuit 39.

The addition circuit 42 is a specific example of “generation means” in the present invention, and includes the difference data expanded by the expansion circuit 40 and the data related to the HD-size video output from the up-converter 37. , The data relating to the HD image quality can be generated.

[0061] The HD encoder 41 is configured to be capable of MPEG2 compression (encoding) of data relating to HD image quality video. After the MPEG2 compression, an HD stream is generated.

[0062] The CPU 50 is configured to be able to control the operation of the information recording / reproducing apparatus 1 as a whole (ie, various configuration requirements surrounded by solid lines in FIG. 1). That is, by outputting a system command to each component included in the information recording / reproducing apparatus 1, the entire information recording / reproducing apparatus 1 is controlled. Usually, software for operating the CPU 50 is stored, for example, in an external memory.

The memory 51 includes, for example, a semiconductor memory such as a RAM (Random Access Memory) or a flash memory, and is configured to temporarily record various data necessary for the operation of the information recording / reproducing apparatus 1. .

[0064] Among the various components of the information recording / reproducing apparatus 1, the components mainly surrounded by a chain line indicated by la in FIG. 1 (that is, the hard disk drive 11, the optical disk drive 21, the HD decoder 31, The down converter 32, the SD encoder 33, the CPRM circuit 34, the frame memory 35, the SD decoder 36, the up converter 37, the difference circuit 38, the compression circuit 39, etc.) constitute one specific example of the information recording device of the present invention. Also, components mainly surrounded by a chain line indicated by lb in FIG. 1 (that is, a hard disk drive 11, an optical disk drive 21, a CPRM circuit 34, an SD decoder 36, an up-converter 37, a decompression circuit 40, an HD encoder 41, The addition circuit 42 and the like) constitute one specific example of the information reproducing apparatus according to the present invention.

Further, in the above-described embodiment, a bus that mediates various components is used for simplifying the drawing. It is to be noted that the block diagram is described with some parts omitted. For example, when an SD stream is recorded on the hard disk 10, the SD stream is output to the SD decoder 36 via a bus (not shown), and SD quality video is reproduced.

[0066] Furthermore, arrows attached to buses that mediate various constituent elements exemplarily show data input / output directions, and data input / output directions are limited to the directions of the arrows. Needless to say! / ヽ.

[0067] (Operating principle)

Subsequently, the operation principle of the information recording / reproducing apparatus according to the present embodiment will be described with reference to FIGS.

[0068] (1) MOVE operation

First, the MOVE operation of the information recording / reproducing apparatus according to the present embodiment will be described with reference to FIGS. Here, FIG. 2 is a flow chart conceptually showing the flow relating to the MOVE operation, FIG. 3 is a block diagram excerpting the components related to the MOVE operation, and FIG. FIG. 3 is an explanatory diagram conceptually showing data recorded on each of the optical discs 20.

As shown in FIG. 2, first, data relating to HD image quality video recorded on the node disk 10 and MPEG2-compressed data (that is, an HD stream) is read, and the HD decoder 31 reads the data. (Step S101). By this decoding operation, data relating to the HD quality video before being MPEG2 compressed (hereinafter, appropriately referred to as “HD data”) is generated.

[0070] Then, the decoded HD data is input to downconverter 32. Then, by the operation of the down-converter 32, the HD data is converted to data relating to SD-size video (hereinafter, appropriately referred to as "SD data") (step S102).

Subsequently, the SD data is input to the SD encoder 33. Then, by the operation of the SD encoder 33, SD encoding (that is, MPEG2 compression) processing is performed on the input SD data (step S103). As a result, an SD stream is generated.

After that, a CPRM process is performed on the SD stream (step S104). Specifically, a device key of the information recording / reproducing device 1 or a device key previously recorded on the optical disc 20 are used. An encryption key is generated according to a media key (for example, an MKB (Media Key Block)), a unique ID number of the optical disk 20, and the like. That is, the recorded content (in this case, the SD stream) is encrypted based on the encryption key.

Then, the encrypted SD stream is recorded on the optical disc 20 (Step S105).

At this time, the operation described below is performed in parallel with the operation of recording the SD stream on the optical disc 20 described up to step S105.

Specifically, the HD stream decoded in step S 101 (ie, HD data generated by the operation of the HD decoder 31) is output to the frame memory 35 in addition to the down converter 32. (Step S106).

Furthermore, the SD data encoded in step S103 (ie, the SD stream generated by the operation of the SD encoder 33) is output to the SD decoder 36 in addition to the CPRM circuit 34. Then, the SD stream is decoded by the operation of the SD decoder 36 (step S107), and SD data is generated.

Then, the SD data is output to up-converter 37. Then, up-conversion of the SD data is performed by the operation of the up-converter 37 (step S108). That is, from the SD data, data relating to an HD-size image, which is a specific example of the “third content information” in the present invention, is generated.

After that, by the operation of the difference circuit 38, difference data indicating the difference between the data relating to the HD-size video generated in step S108 and the HD data stored in the frame memory 35 in step S106 is generated. (Step S109). At this time, by adjusting the timing at which the HD data is output to the difference circuit 38 in the frame memory 35, for example, the difference data can be synchronized with each other on the content reproduction time axis, for example, by synchronizing each frame. Preferably, it is configured to be input to 38.

The generation of the difference data will be described in more detail. For example, the difference between the pixels at the predetermined playback time indicated by the HD data and the data related to the HD size image is calculated to calculate the difference in pixel units. I do. For example, luminance, hue, and the like are compared for each pixel, and a difference between them is calculated. Then, by performing the calculation of the difference for all reproduction times of the content, difference data can be generated. Here, the table that appears in the video As soon as a particularly large difference is calculated in the outline portion of the display object, the difference data mainly conceptually indicates the outline portion of the display object.

That is, the difference data by itself does not mean a predetermined video, audio, or the like at all, and is subjected to data processing (specifically, addition, Processing) constitutes meaningful video and audio for the first time.

After that, the compression processing is performed on the generated difference data by the operation of the compression circuit 39 (step S110). For example, the compression circuit 39 may be configured to perform MPEG2 compression or the like.

[0082] Then, the compressed difference data is recorded on the hard disk 10 (step S111), and the HD stream is deleted from the hard disk 10 (step S112). At this time, the compressed difference data may be recorded on the hard disk 10 so that the compressed difference data is overwritten on the HD stream.

FIG. 3 shows the extracted components on the block diagram where the MOVE operation is actually performed. That is, mainly by the operations of the hard disk drive 11, optical disk drive 21, HD decoder 31, down converter 32, SD encoder 33, CPRM circuit 34, frame memory 35, SD decoder 36, up converter 37, difference circuit 38, and compression circuit 39. , The above-described MOVE operation is performed. In FIG. 3, the names of various data that are input and output between components are described.

In summary, the SD stream is recorded on the optical disk 20, the HD stream is deleted from the hard disk 10, and the compressed differential data is recorded on the hard disk 10. The mode of data recorded on each of the hard disk 10 and the optical disk 20 at this time will be described with reference to FIG.

As shown in FIG. 4A, the entire HD stream is recorded on the hard disk 10 before the MOVE operation!

[0086] Then, as the above-described MOVE operation proceeds, the HD stream is gradually erased from the hard disk 10 as shown in Figs. 4 (b) and 4 (c), and the difference data is transferred to the hard disk 10. The recording is gradually performed, and the SD stream is gradually recorded on the optical disc 10. [0087] When all the SD streams have been recorded on the optical disc 20, as shown in Fig. 4 (d), all the HD streams have been deleted from the hard disk 10, and instead, the compressed differential data is recorded. Being done.

[0088] The MOVE operation is performed so that the HD streams corresponding to the SD streams recorded on the optical disc 20 are simultaneously erased. In other words, the MOVE operation is performed so that the HD streams indicating the video corresponding to the video indicated by the SD stream recorded on the optical disc 20 (that is, for example, of the same frame) are simultaneously deleted from the hard disk 10. For example, the SD stream is recorded on the optical disc 20 for each one-minute (or several minutes, several seconds) reproduction time unit, and the HD stream is deleted from the hard disk 10. However, even if the recording of the SD stream and the differential data and the erasing of the HD stream are not performed as described above, for example, when the user uses the optical disk 20 or the node disk 10, the copyright of the content is appropriately protected. In such a state, the recording of the SD stream and the difference data and the erasing of the HD stream may be performed in any order and manner.

As described above, according to the information recording / reproducing apparatus 1 according to the present embodiment, while properly protecting the copyright of the content, the difference data recorded on the hard disk 10 is used as described later. HD quality video can be played.

It is to be noted that, in the above-described embodiment, it is preferable that the HD stream is sequentially read, and the operations from step S101 to step S112 are sequentially performed on the read HD stream. That is, as a premise of the MOVE operation, it is necessary to read the entire HD stream of one content recorded on the hard disk 10 at a time and perform the operations from step S101 to step S112 on the entire HD stream at once. If the MOVE operation is performed in real time, the HD stream is read out sequentially (for example, in units of several frames) within a range that can be processed by the information recording / reproducing apparatus 1 (that is, there is no need to perform batch processing) Yo!

[0091] (2) Playback operation of HD image quality video after MOVE operation and MOVE BACK operation (HD) Next, referring to Figs. 5 and 6, playback operation of HD image quality video and MOVE BACK operation after MOVE operation (HD) will be described. FIG. 5 is a flowchart conceptually showing the flow of the playback operation of the HD quality image after the MOVE operation and the MOVE BACK operation (HD). FIG. 6 is a block diagram in which components related to the operation of reproducing the HD image quality after the MOVE operation and the MOVE BACK operation (HD) are extracted.

[0092] The MOVE BACK operation refers to an operation of recording the data again on the original recording medium after the MOVE operation. Specifically, after performing a MOVE operation of recording data recorded on one recording medium on another recording medium, an operation of recording data recorded on the other recording medium again on one recording medium. Is referred to as a MOVE BACK operation. In particular, the operation of recording on the original recording medium as an HD stream is referred to as a MOVE BACK operation (HD), and the operation of recording on the original recording medium as an SD stream is referred to as a MOVE BACK operation (SD).

As shown in FIG. 5, first, difference data is read from the node disk 10 (step S 201). Then, the expansion processing of the differential data is performed by the operation of the expansion circuit 40 (step S202).

[0094] In parallel with the reading and decompression processing of the difference data, the SD stream is read from the optical disc 20 (step S203). Subsequently, the read SD stream is subjected to CPRM processing (step S104). Here, specifically, a decryption key for decrypting the code is generated according to a device key of the information recording / reproducing apparatus 1, a media key recorded in advance on the optical disc 20, and the like. Then, using the decryption key, the encryption applied to the SD stream is decrypted and decrypted.

Subsequently, the decoding of the decrypted SD stream is performed by the operation of the SD decoder 36 (step S 107), and SD data is generated.

[0096] Subsequently, the SD data is output to the up-converter 37. Then, up-conversion of the SD data is performed by the operation of the up-converter 37 (step S108). That is, data relating to an HD-size video is generated from the SD data.

[0097] Thereafter, the difference data subjected to the decompression processing in step S202 and the data related to the HD-size video output from the up-computer 37 are added by the operation of the addition circuit 42, so that the HD data is obtained. Is generated (step S204). That is, HD data is generated by performing an operation opposite to the above-described operation of generating difference data in the difference circuit 38. At this time, the timing and the difference between the timing at which data related to HD By adjusting (or synchronizing) the timing at which data is output to the adder circuit 42, for example, the adder circuit 42 is synchronized while synchronizing the corresponding data on the reproduction time axis of the content, for example, on a frame basis. It is preferable to be configured to be input to For example, at the time of the above-mentioned MOVE operation, the head offset address on the hard disk 10 of the corresponding difference data may be recorded as the user data (or additional data) of the SD stream, or The table in which the head offset address is recorded may be separately recorded on the node disk 10.

[0098] Thereafter, by reproducing the generated HD data (step S205), the user can view the HD quality video.

[0099] If an information recording / reproducing apparatus that does not generate difference data, such as a conventional hard disk recorder, converts an HD stream recorded on the hard disk 10 into an SD stream (ie, down-converts, etc.) After performing the MOVE operation, it is difficult or impossible to reproduce the SD stream again as an HD image. Also, even if SD data is up-converted, it can be played back as HD-size video in terms of the number of pixels, but it is difficult or impossible to play back the video as the original HD quality video.

However, according to the information recording / reproducing device 1 according to the present embodiment, even after the HD stream recorded on the hard disk 10 is converted into the SD stream and recorded on the optical disk 20, If the SD stream is reproduced using the difference data, it will be possible to reproduce the HD quality video again. Even if the HD stream is converted to an SD stream and recorded on the optical disc 20, only the difference data that is completely different from the original HD stream or SD stream is recorded on the hard disc 10, and the copyright of the content Is properly protected.

[0101] Therefore, for example, at home or the like, the user plays back an HD stream recorded on an advanced information recording / reproducing device such as a hard disk recorder, so that the user can view the image on a large screen such as a plasma television or a projector. You can watch high-quality video. On the other hand, by converting the HD stream and recording it as an SD stream on an optical disc 20 such as a DVD, for example, a DVD player mounted on a car (or a DVD player mounted on a car navigation system) And similar content in the car You can enjoy it. In other words, the user can reproduce the desired content at the desired reproduction quality regardless of whether it is a place where an advanced AV viewing environment can be realized, such as at home, or a place where a simple AV viewing environment can be realized, such as in a car. Can enjoy the great advantage of selective viewing.

[0102] On the other hand, in addition to or instead of reproducing HD data as described above, encoding processing may be performed on the HD data generated by the adding circuit 42 (step S206). ). That is, an HD stream is generated by performing MPEG2 compression processing on HD data.

[0103] Then, the generated HD stream is recorded on the hard disk 10 (step S207).

. That is, a MOVE BACK operation (HD) may be performed.

[0104] In parallel with the HD stream recording operation, the SD stream recorded on the optical disc 20 is erased (step S208). Thus, the copyright of the content can be protected. The user will be able to watch the HD quality video recorded on the hard disk again.

At this time, it is preferable that difference data recorded on the hard disk 10 is also deleted. As a result, the recording capacity of the hard disk 10 can be used more effectively.

FIG. 6 shows the extracted components on the block diagram where the HD image quality video playback operation and the MOVE BACK operation (HD) are actually performed after the MOVE operation. That is, mainly by the operations of the hard disk drive 11, the optical disk drive 21, the CPRM circuit 34, the SD decoder 36, the up-converter 37, the decompression circuit 40, the HD encoder 41, and the power! The playback operation of the image quality image and the MOVE BACK operation (HD) are performed. Then, by outputting the HD data to an external output device (for example, various displays and various audio devices, etc.) connected to the output 1, the user can view the HD quality image. In FIG. 6, the names of various data input / output between the components are described.

[0107] (3) Playback operation of SD quality image after MOVE operation and MOVE BACK operation (SD) Next, referring to FIGS. 7 and 8, playback operation of SD quality image after the MOVE operation and The MOVE BACK operation (SD) will be described. FIG. 7 is a flowchart conceptually showing the flow of the SD quality image playback operation and the MOVE BACK operation (SD) after the MOVE operation, and FIG. 8 is the SD image image playback after the MOVE operation. It is the block diagram which extracted the component regarding an operation | movement and MOVE BACK operation | movement (SD).

As shown in FIG. 7, first, an SD stream is read from the optical disc 20 (step S20).

3). Subsequently, the read SD stream is subjected to CPRM processing (step S1).

04). Here, specifically, a decryption key for decrypting the code is generated according to a media key or the like recorded in advance on the device key / optical disk 20 of the information recording / reproducing apparatus 1. Then, using the decryption key, the encryption applied to the SD stream is decrypted and decrypted.

Subsequently, the decoding of the decrypted SD stream is performed by the operation of the SD decoder 36 (step S 107), and SD data is generated. Then, by reproducing the generated SD data (step S301), the user can view the SD size video (ie, the SD quality video).

On the other hand, in addition to or instead of reproducing the SD data as described above, the decrypted SD stream may be recorded on the hard disk 10 (step S302). That is, MOVE BACK operation (SD) may be performed!

[0111] In parallel with the recording operation of the SD stream, the SD stream recorded on the optical disc 20 is erased (step S208). Thus, the copyright of the content can be protected. Then, the SD stream read from the hard disk 10 is subjected to decoding processing by the operation of the SD decoder 36, so that SD quality video can be reproduced.

[0112] At this time, since the difference data recorded on the hard disk 10 is necessary to reproduce HD data using the SD stream recorded on the hard disk 10, it is preferable to keep the difference data as it is. Better!/,.

As described above, even when both the SD stream and the difference data are recorded on the hard disk 10, these data are recorded in the calorie calculation circuit 42 in the same manner as in the “playback operation of HD image quality after MOVE” described above. By performing the addition process, HD quality video can be viewed. Further, if the content is recorded in advance on the hard disk 10 as an SD stream as described above, when the SD stream recorded on the hard disk 10 is recorded on the optical disk 20 (ie, at the time of the MOVE operation), A high-speed MOVE operation that does not require complicated data processing (eg, down-conversion processing, encoding processing, decoding processing, etc.) can be realized.

[0115] FIG. 8 shows the extracted components on the block diagram in which the SD image quality video playback operation and the MOVE BACK operation (SD) after the MOVE operation are actually performed. That is, mainly, the operation of the hard disk drive 11, the optical disk drive 21, the CPRM circuit 34, and the SD decoder 36 perform the above-described SD image quality reproduction operation after the MOVE operation and the MOVE BACK operation (SD). Then, the SD data is output to an external output device (for example, various displays and various audio devices, etc.) connected to the output 2, so that the user can watch the SD quality video. In FIG. 8, names of various data input and output between the respective components are described.

[4] (4) Playback operation of HD quality video after MOVE BACK operation (HD)

Next, with reference to FIG. 9 and FIG. 10, a description will be given of a playback operation of the HD quality image after the MOVE BACK operation (HD). Here, FIG. 9 is a flowchart conceptually showing the flow of the playback operation of the HD quality image after the MOVE BACK operation (HD), and FIG. 10 is the playback process of the HD image quality after the MOVE BACK operation (HD). FIG. 4 is a block diagram in which components related to the operation are extracted.

As shown in FIG. 9, the HD stream recorded on the hard disk 10 is read (step S401), and the read HD stream is subjected to a decoding process (step S101). That is, HD data is generated. Then, by reproducing the generated HD data (step S205), the user can view the HD quality video.

[0118] The playback operation described here is the same as the operation of playing back an HD stream recorded on the hard disk 10 before the MOVE operation.

FIG. 10 shows the extracted components on the block diagram in which the playback operation of the HD image quality video after the MOVE BACK operation (HD) is actually performed. That is, the above-described MOVE BACK operation is mainly performed by the operations of the hard disk drive 11 and the HD decoder 31. The playback operation of the HD quality video after the work (HD) is performed. Then, by outputting the HD data to an external output device (for example, various displays or various audio devices, etc.) connected to the output 3, the user can view the HD image. In FIG. 10, the names of various data input / output between the components are described.

As described above, according to the information recording / reproducing apparatus 1 according to the present embodiment, after the HD stream recorded on the hard disk 10 is converted into the SD stream and recorded on the optical disc 20, However, if the operation of reproducing the SD stream is performed using the difference data as described above, it becomes possible to reproduce the HD quality video again. Even if the HD stream is converted to an SD stream and recorded on the optical disk 20, only the difference data that is completely different from the original HD stream or SD stream is recorded on the hard disk 10, and the Can appropriately view the content related to the desired reproduction quality while appropriately protecting the copyright of the content.

In the above embodiments, the hard disk 10 and the optical disk 20 were described as an example of the recording medium, and the recorder (player) of the hard disk 10 and the optical disk 20 was described as an example of the information recording / reproducing apparatus. The present invention is not limited to a hard disk, an optical disk, and its recorder (player), but may be applied to other various recording media and its recorder (player).

[0122] The present invention is not limited to the embodiments described above, and may be modified as appropriate without departing from the spirit or spirit of the readable invention. An information recording device and method, an information reproducing device and method, and a computer program for recording control and reproduction control are also included in the technical scope of the present invention.

Industrial applicability

The information recording apparatus and method, the information reproducing apparatus and method, and the computer program according to the present invention can be used, for example, for consumer or business DVD recorders and DVD players. Further, for example, the present invention can be used for an information recording / reproducing device mounted on various consumer or business computer devices or connectable to various computer devices.

T800 / S00Zdf / X3d SS ^ .860ΐ / δ00Ζ OAV

Claims

The scope of the claims

[1] Down-converting the first content information of the first reproduction quality recorded on the first recording medium to generate the second content information of the second reproduction quality with a lower definition than the first reproduction quality Means,

First recording means for recording the second content information on a second recording medium,

When the second content information is recorded on the second recording medium, first erasing means for erasing the first content information recorded on the first recording medium,

Difference information indicating a difference between the third content information of the second reproduction quality having a pixel size related to the first reproduction quality and generated by up-converting the second content information and the first content information. Difference means for generating

An information recording device comprising:

2. The information recording apparatus according to claim 1, further comprising a second recording unit that records the difference information on the first recording medium.

[3] Up-conversion means for up-converting the second content information to generate the third content information,

Conversion means for converting the reproduction quality of the generated third content information from the second reproduction quality to the first reproduction quality based on the difference information;

2. The information recording device according to claim 1, further comprising:

[4] third recording means for recording the third content information converted to the first reproduction quality on the first recording medium,

A second erasing unit for erasing the second content information recorded on the second recording medium when the third content information converted to the first reproduction quality is recorded on the first recording medium;

4. The information recording device according to claim 3, comprising:

[5] Down-converting the first content information of the first reproduction quality recorded on the first recording medium to generate the second content information of the second reproduction quality with a lower definition than the first reproduction quality Process and

A first recording step of recording the second content information on a second recording medium; When the second content information is recorded on the second recording medium, a first erasing step of erasing the first content information recorded on the first recording medium,

Updating the second content information and generating difference information indicating a difference between the third content information of the second reproduction quality having a pixel size related to the first reproduction quality and the first content information. Difference process

An information recording method, comprising:

[6] An information reproducing apparatus for reproducing the second content information recorded on the second recording medium with a desired reproduction quality by the information recording apparatus according to claim 1, wherein the second content is Up-conversion means for up-converting information to generate the third content information;

First playback means for converting the playback quality of the generated third content information from the second playback quality to the first playback quality based on the difference information and playing the converted content;

An information reproducing apparatus comprising:

[7] The information reproducing apparatus according to claim 6, further comprising a second reproducing means for reproducing the second content information.

[8] An information reproducing method for reproducing the second content information recorded on the second recording medium with a desired reproduction quality by the information recording device according to claim 1, wherein the second content is Up-converting information to generate the third content information;

A first reproduction step of converting the reproduction quality of the generated third content information to the second reproduction quality power based on the difference information and reproducing the converted information.

An information reproducing method, comprising:

[9] A computer program for recording control for controlling a computer provided in the information recording apparatus according to claim 1, wherein the computer is a computer program for controlling the down-converting means, the first recording means, A computer program functioning as at least one of the first erasing means and the difference means.

[10] A computer program for reproduction control for controlling a computer provided in the information reproducing apparatus according to claim 6, wherein the computer is provided with the up-converter. And a computer program functioning as at least one of the first reproducing means.