JP2005196850A - Data recording and reproducing apparatus and data recording and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve response of recording operation directly after start of a power source or directly after loading of a recording medium in a data recording and reproducing apparatus having a high edition property for a large capacity recording medium. <P>SOLUTION: This apparatus is provided with a track ciphering information memory 3a for reading which develops newly control data of track ciphering information or the like in a data recording and reproducing apparatus, a ciphering processing part 4 ciphering new recording data such as music data or the like inputted externally, and a track ciphering information memory 3b for write-in which stores ciphering information generated when ciphering is performed by the ciphering processing part 4. When recording operation is performed, the ciphering information about contents data being recorded is developed in the ciphering information memory (ciphering data developing region) 3a for reading, ciphering data information of the new recording data made on the track ciphering information memory 3b for write-in is merged with a ciphering information table of a contents data unit and rewritten in the disk after recording operation is finished. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a data recording / reproducing apparatus and a data recording / reproducing method, and more particularly, to a data recording / reproducing apparatus and a data recording / reproducing method having high editing characteristics for a large capacity recording medium.

  In recent years, various technologies for increasing the capacity of recording media such as disks have been developed. There is also a need to be able to freely record and reproduce various data, such as audio data and data for computer use, for one medium. However, regarding the development of general-purpose media, compatibility and consistency of conventional recording / reproducing devices and the like are also important. Also, from a physical viewpoint, it is preferable that old assets can be used effectively.

  An example is the Mini Disc (MD (registered trademark)), which is currently widely used. As is well known, the mini-disc is a magneto-optical disc having a diameter of 64 mm and can record and reproduce audio data such as music. In a minidisc, audio data is recorded with the data amount compressed to 1/5 to 1/10 by the ATRAC method. Taking audio data as an example, recording for about 80 to 160 minutes is possible. The mini-disc is a file system that takes editability into consideration, such as dividing (dividing), connecting (combining), erasing (erasing), moving (track number move), and the like.

  Content data such as music and video recorded on package media such as CD-DA (Compact Disc Digital Audio) and DVD (Digital Versatile Disc) is played on a personal computer (PC), and the HDD (Hard Disc Drive) of the PC Is used as a primary recording medium, and a technique for duplicating (copying) or moving (moving) it onto a mini-disc as a secondary recording medium is disclosed (for example, see Patent Document 1).

  In Patent Document 1, data transfer is performed at the time of data transfer between a PC and a terminal, content right management is performed even when content data (data that is a unit of music or the like called a track) is edited, and SDMI (Secure Digital Music Initiative) The so-called check-in (right transfer) / check-out (right return) consistency is achieved.

  Since audio mini-discs are easily available to users, it would be convenient if this mini-disc could be used widely for purposes other than music, such as computer data storage media, but the recording capacity was 160 MB. In addition, the area for recording copyright protection information such as ID unique to the media is not prepared. Therefore, when it is assumed that it is used for music video distribution or the like as a wide range of data storage, there is a problem that it is not possible to respond to a request for copyright protection of distributed content. In addition, since a management system (PTOC (Premastered Table Of Contents), UTOC (User Table Of Contents)) using a unique management area other than the audio data recording area is adopted, for example, a general-purpose file system such as a FAT system is used. It is difficult to respond to Further, when data other than audio is recorded on a track managed by UTOC, problems such as abnormal noise being generated during reproduction by many audio devices (MD players) may occur. In other words, when it is assumed that the audio mini-disc is used as a general-purpose storage medium, special information such as recording capacity, management system, copyright protection and the like, problems with old models, etc. have been problems.

  As a standard for recording data other than audio data in a mini-disc system, a disc standard called “MD-DATA” or “MD-CLIP” has already been developed, but MD-DATA is an audio MD. It does not satisfy the above-mentioned demands such as a different dedicated disk, a recording / reproducing apparatus compatible with MD-DATA, and a recording capacity of about 140 MB. In addition, MD-CLIP can use audio MD and uses an inner peripheral portion that is not subject to UTOC management, so there is no inconvenience in conventional audio equipment, but the general-purpose data recording area is only about 2 MB. The application was naturally limited.

  Therefore, by making improvements such as narrowing the track pitch, changing the linear velocity and modulation method, etc., the recording data can be densified. Next-generation mini-discs that have solved the above-mentioned problems have been proposed. These next-generation mini-discs adopt a new management data structure different from UTOC, and unlike conventional mini-discs that were recorded in plain text when recording the disc, the data is encrypted and recorded on the disc. It has become. In the next generation mini-disc, data such as music content and video content for which copyright is generated is recorded in a secure area in a predetermined format and can be reproduced only by a device that can refer to the secure area.

  As a general recording operation for a recording medium, the recording / reproducing apparatus first reads information on a recorded area (track) on the recording medium and expands it in a memory in the apparatus, and then executes a recording process on the medium to perform recording. It is necessary to update the information in the completed area and write it back to the disk.

  However, in particular, in the recording system of the type that handles the above-mentioned next-generation mini-disc that encrypts data and records it on a recording medium, encryption information such as an encryption key required for encryption together with the encrypted data Must also be expanded into memory at the same time. In the next-generation mini-disc, first, all pieces of encrypted information of content units (tracks in the case of music data) that can be recorded in large quantities must be read into the memory. Whether or not the recording area of the content unit has already been used cannot be known unless all the encryption information for each content unit is expanded. Therefore, the recorded area information and the recorded area are recorded regardless of whether the recording area is used or not. All data encryption information is once prepared in the internal memory.

  For this reason, if an immediate recording is performed immediately after the power is turned on or immediately after the disc is inserted, an operation for reading a large amount of management data into the encryption information table in the internal memory of the device and new encryption information created by the recording are stored. There is a problem that the operation of writing to the table conflicts. Therefore, during the period when management data such as disk encryption information is read into the internal memory, the memory update operation must be waited. Especially when streaming recording is performed, the beginning of the data (recording start portion) is recorded. There was a bad effect such as not being able to.

JP 2002-373470 A

  An object of the present invention is to improve the responsiveness of a recording operation immediately after power-on or immediately after mounting of a recording medium in a data recording / reproducing apparatus having high editing characteristics with respect to a large-capacity recording medium.

  In order to achieve the above-described object, a data recording / reproducing apparatus according to the present invention includes a reading unit that reads out encryption information for each content unit of content data recorded on a recording medium, and a first unit that stores the read out encryption information. 1 encryption information storage means, content acquisition means for acquiring new content data from the outside, encryption means for encrypting the acquired content data, and a recording medium when content data is encrypted by the encryption means Encryption information creation means for creating new encryption information for each content unit when recording, second encryption information storage means for storing the created new encryption information, and second encryption information storage Recording means for recording the new encrypted information stored in the means and the encrypted content data on the recording medium, and the encrypted information read by the reading means. New encrypted information for recording the content data to be recorded and recorded in the first encrypted information storage means, created in the second encrypted information storage means, merged both encrypted information, Write the encrypted information back to the recording medium.

  In the present invention, the encryption information for each content unit includes an encryption method corresponding to each content unit of the content data, an encryption key, and part pointer information indicating that the content unit is a part of the same file. Data management information including pointer information indicating an entry to the part information table to be managed. When the content data is music data, the content unit is a track as a delimiter for each music.

  In order to achieve the above object, a data recording / reproducing method according to the present invention includes a reading step of reading encrypted information for each content unit of content data recorded on a recording medium, A storage step for storing in one encryption information storage means, a content acquisition step for acquiring new content data from the outside, an encryption step for encrypting the acquired content data, and encrypting the content data in the encryption step An encrypted information creating step for creating new encrypted information for each content unit when recording on a recording medium, and a storing step for storing the created new encrypted information in the second encrypted information storage means A recording process for recording the new encrypted information and the encrypted content data on the recording medium, and the new encrypted information stored in the second encrypted information storage means The encrypted information read in the reading process is read into the first encrypted information storage means, and the new encrypted information for recording the content data to be recorded is the second information Created in the encrypted information storage means, merges both encrypted information, and writes the merged encrypted information back to the recording medium.

  Here, the encryption information for each content unit manages the encryption method corresponding to each content unit of the content data, the encryption key, and the part pointer information indicating that the content unit is a part of the same file. This is data management information including pointer information indicating an entry to the part information table. In this case, in the reading step, one content unit is selected from the reproduction order table indicating the reproduction order of each content unit, and the encryption method, the encryption key, and a part of the same file corresponding to each content unit are selected. The content unit information corresponding to the selected content unit is read from the data management information table including the pointer information indicating the entry to the part information table that manages the part pointer information indicating the part information table, and the part information table is read from the part information table. The part information corresponding to the pointer information is read, and a part of the file corresponding to the part pointer information in the part information is read. In the present invention, when the content data is music data, the content unit is a track as a delimiter for each music.

  According to the data recording / reproducing apparatus and the data recording / reproducing method of the present invention, when content data is recorded on the recording medium, the encryption information such as the encoding method of the track information and the encryption key is created in the recording-dedicated area. It is possible to simultaneously record content and read track encryption information from the recording medium. This improves the responsiveness of the recording operation, particularly immediately after the power is turned on or immediately after the recording medium is loaded.

  The data recording / reproducing apparatus according to the present invention is a recording / reproducing apparatus for a recording medium capable of handling different data created in different formats such as audio data, PC data, and the like. The recording medium can be used without limitation as long as the recording medium is characterized by being capable of large-capacity recording, such as a semiconductor memory or a disk-shaped recording medium, but in this specific example, a mini-disk that is a disk-shaped magneto-optical recording medium. A disk (registered trademark) is used. In particular, the data recording / reproducing apparatus shown as this specific example realizes higher recording data density by adding improvements such as narrowing the track pitch and changing the linear velocity and modulation method in addition to the conventional mini-disc, Furthermore, it corresponds to the next generation mini-disc provided with a normal recording area and a secret area (secure area) that can be used by authentication.

  In this next-generation mini disc, data is encrypted and recorded on the disc, unlike a conventional mini disc which is recorded in plain text when the disc is recorded. In this minidisc, data such as music content and video content for which copyrights are generated is recorded in a secret area in a predetermined format, and can be reproduced only by a device that can refer to the secret area. In this specific example, music content is taken as content, and audio data in the ATRAC (registered trademark) format is handled as specific data that can be recorded in this secret area. Audio data other than ATRAC, such as MP3 (MPEG1 Audio Layer-3) format and WMA (Windows Media Audio) format, data such as image data and text data are recorded in the normal recording area. Details of the next generation mini-disc having a secret area and a normal recording area will be described later.

  An outline of a data recording / reproducing apparatus 1 according to the present invention is shown in FIG. In the mini-disc 2 that can be used in the data recording / reproducing apparatus 1, a large amount of management data such as encryption information is required for the music data to be recorded in order to increase the recording data density and to perform encrypted recording. In order to avoid the problems described above, the data recording / reproducing apparatus 1 inputs a track encryption information memory 3a for reading newly developing management data such as track encryption information in the apparatus and an external input. An encryption processing unit 4 for encrypting new recording data such as music data, and a track encryption information memory 3b for writing that stores encryption information generated when the encryption processing unit 4 encrypts the data. Was provided.

  Then, the encryption information related to the content data being recorded is expanded in the read track encryption information memory (encrypted data expansion area) 3a, and the new recording data corresponding to the write track encryption information memory 3b is created. The encrypted data information is merged with the content data unit encryption information table and written back to the disc after the recording operation is completed. As a result, the data recording / reproducing apparatus 1 can execute encryption of the recorded data while reading the management data into the memory.

  Hereinafter, a data recording / reproducing apparatus shown as a specific example of the present invention will be described in detail with reference to the drawings. The data recorded in the secret area in the mini-disc applied in this specific example is an audio file, and here is data based on the ATRAC (Adaptive TRansform Acoustic Coding) method, the ATRAC3 method, and the ATRAC3plus method.

  As shown in FIG. 2, the data recording / reproducing apparatus 1 includes a media drive unit 11, a memory transfer controller 12, a cluster buffer memory 13, a reading auxiliary memory 14, USB interfaces 15 and 16, and a USB hub 17. The system controller 18 and the audio data processing unit 19 are provided. The data recording / reproducing apparatus 1 can be connected to a personal computer (hereinafter referred to as a PC) 100, and can use a mini-disc as an audio data recording medium, and can also be used as an external storage such as a PC.

  The media drive unit 11 in the data recording / reproducing apparatus 1 performs recording and / or reproduction with respect to the loaded mini disc 90. The internal configuration of the media drive unit 11 will be described later.

  The memory transfer controller 12 performs transmission / reception control of reproduction data from the media drive unit 11 or recording data supplied to the media drive unit 11. The cluster buffer memory 13 buffers data read by the media drive unit 11 from the data track of the mini disk 90 in units of high-density data clusters based on the control of the memory transfer controller 12. The read auxiliary memory 14 includes various management information such as UTOC data read from the mini-disc 90 by the media drive unit 11, information for copyright protection recorded in the secret area, information for data tampering check, The external device information and the like permitting limited access are stored based on the control of the memory transfer controller 12.

  The data recording / reproducing apparatus 1 is characterized in that it includes a writing auxiliary memory 20. The auxiliary memory for writing 20 stores track encryption information (content key) as management information generated at the time of encryption of the recording data input from the outside based on the control of the memory transfer controller 12.

  The system controller 18 can communicate with the PC 100 connected via the USB interface 16 and the USB hub 17, and performs communication control with the PC 100 to execute commands such as a write request and a read request. It performs reception, status information, transmission of other necessary information, etc., and overall control of the data recording / reproducing apparatus 1. For example, when the mini-disc 90 is loaded in the media drive unit 11, the system controller 18 instructs the media drive unit 11 to read out management information from the mini-disc 90, and the PTOC read by the memory transfer controller 12. Management information such as UTOC is stored in the auxiliary reading memory 14. The system controller 18 grasps the track recording state of the mini-disc 90 by reading these management information. Further, the system controller 18 generates management information such as PTOC, UTOC, etc. recorded on the mini-disc 90 and encryption information of the recording data, and stores it in the auxiliary memory 20 for writing via the memory transfer controller 12. Store.

  Then, when there is a read request for a FAT sector from the PC 100, the system controller 18 gives a signal to the media drive unit 11 to read the data cluster including the FAT sector. The read data cluster is written into the cluster buffer memory 13 by the memory transfer controller 12. However, when the data of the FAT sector has already been stored in the cluster buffer memory 13, reading by the media drive unit 11 is not necessary. At this time, the system controller 18 gives a signal for reading out the requested FAT sector data from the data of the high-density data cluster written in the cluster buffer memory 13, and the PC 100 via the USB interface 15 and the USB hub 17. Control to transmit to or to perform audio playback processing.

  Further, when a write request to a certain FAT sector is received from the PC 100, the system controller 18 reads the data cluster including the FAT sector from the media drive unit 11 based on the read auxiliary memory 14. Let The read data cluster is written into the cluster buffer memory 13 by the memory transfer controller 12. However, when the data of the FAT sector has already been stored in the cluster buffer memory 13, reading by the media drive unit 11 is not necessary. The system controller 18 supplies the FAT sector data (recorded data) transmitted from the PC 100 to the memory transfer controller 12 via the USB interface 15, and rewrites the corresponding FAT sector data on the cluster buffer memory 13. Let At this time, the management information developed in the auxiliary writing memory 20 is updated. Further, the system controller 18 instructs the memory transfer controller 12 to transfer the data cluster data stored in the cluster buffer memory 13 to the media drive unit 11 as recording data in a state where necessary FAT sectors are rewritten. At this time, the media drive unit 11 modulates and writes the recording data of the data cluster by the modulation method supported by the mounted mini disk.

  By the way, as in this specific example, when the mini-disc 90 has a secret area and a normal recording area, and data to be recorded in each area is determined in advance, the system controller 18 stores data to be recorded and reproduced. The media drive unit is instructed to access based on the recording area designated according to whether it is an audio track or a data track. In the data recording / reproducing apparatus 1, it is possible to perform control to permit recording of only one of PC data and audio data on the mounted mini disc 90 and prohibit recording of other data. . That is, control can be performed so that PC data and audio data are not mixed.

  In the data recording / reproducing apparatus 1 shown as the specific example, the recording / reproducing control described above is a control when recording / reproducing the data track, and the data transfer when recording / reproducing the MD audio data (audio track) is: This is performed via the audio data processing unit 19.

  The audio data processing unit 19 includes, as an input system, for example, an analog audio signal input unit such as a line input circuit / microphone input circuit, an A / D converter, and a digital audio data input unit. The audio data processing unit 19 includes an ATRAC compression encoder / decoder and a compressed data buffer memory. Furthermore, the audio data processing unit 19 includes an analog audio signal output unit such as a digital audio data output unit, a D / A converter, and a line output circuit / headphone output circuit as an output system.

  An audio track is recorded on the mini disc 90 when digital audio data (or an analog audio signal) is input to the audio data processing unit 19. Linear PCM audio data that is input as linear PCM digital audio data or analog audio signals and then converted by an A / D converter is subjected to ATRAC compression encoding and stored in a buffer memory. Thereafter, the data is read from the buffer memory at a predetermined timing (data unit corresponding to the ADIP cluster) and transferred to the media drive unit 11. In the media drive unit 11, the transferred compressed data is modulated by the EFM modulation method or the RLL (1-7) PP modulation method, and written as an audio track in the secret area of the mini-disc 90. Data compressed by a compression method other than ATRAC is written as general data in the normal recording area.

  When reproducing the audio track from the mini-disc 90, the media drive unit 11 demodulates the reproduction data into the ATRAC compressed data state and transfers it to the audio data processing unit 19. The audio data processing unit 19 performs ATRAC compression decoding to obtain linear PCM audio data, which is output from the digital audio data output unit. Alternatively, line output / headphone output is performed as an analog audio signal by a D / A converter.

  The configuration shown in FIG. 2 is an example. For example, when the data recording / reproducing apparatus 1 is connected to the PC 100 and used as an external storage device that records and reproduces only the data track, the audio data processing unit 19 is unnecessary. On the other hand, when the main purpose is to record and reproduce audio signals, it is preferable to include the audio data processing unit 19 and further to include an operation unit and a display unit as a user interface. The connection with the PC 100 is not limited to USB, but, for example, a so-called IEEE 1394 interface conforming to a standard established by IEEE (The Institute of Electrical and Electronics Engineers, Inc.) The connection interface can be applied.

  Next, data recording processing by the data recording / reproducing apparatus 1 will be described with reference to FIG. In step S1, when the data recording / reproducing apparatus 1 receives a content data recording instruction from the user almost simultaneously with activation, the data recording / reproducing apparatus 1 reads the TOC on the disc in step S2. If this mini-disc can record music data for 2048 songs, for example, track encryption information for all tracks 1 to 2048 is developed in the read auxiliary memory 14. At this time, content data is simultaneously recorded. That is, as step S3, the data recording / reproducing apparatus 1 encrypts the recording data. At this time, track encryption information is generated. Next, in step S4, the generated track encryption information is stored in the auxiliary writing memory 20. When the recording process ends, in step S5, the track encryption information stored in the read auxiliary memory 14 and the track encryption information stored in the write auxiliary memory 20 are merged, and in step S6, the merge is performed. Write the track encryption information back to the minidisc. As a result, the data recording / reproducing apparatus 1 can execute encryption of newly recorded data during the TOC read.

  Next, a specification example of the mini disk 90 used in this specific example will be described. The physical format of conventional mini-discs (and MD-DATA) is defined as follows. The track pitch is 1.6 μm and the bit length is 0.59 μm / bit. The laser wavelength λ is λ = 780 nm, and the aperture ratio of the optical head is NA = 0.45. As a recording system, a groove recording system that uses grooves (grooves on the disk board surface) as tracks for recording and reproduction is adopted. As an address system, a single spiral groove is formed on the disk surface, wobbles meandering at a predetermined frequency (22.05 KHz) are formed on both sides of the groove, and the absolute address is set to the above frequency. Is used as a reference and recorded on a wobbled groove track. In the present specification, an absolute address recorded as wobble is also referred to as ADIP (Address in Pre-groove).

  In the conventional MD, recording is performed by adding 4 sectors as link sectors to 32 sectors as the main data portion and totaling 36 sectors as one cluster unit. The ADIP signal is composed of a cluster address and a sector address. The cluster address is composed of an 8-bit cluster H and an 8-bit cluster L, and the sector address is composed of a 4-bit sector. The conventional mini-disc employs an EFM (8-14 conversion) modulation method as a recording data modulation method. As an error correction method, ACIRC (Advanced Cross Interleave Reed-Solomon Code) is used. A convolution type is adopted for data interleaving. As a result, the data redundancy is 46.3%.

  Further, the data detection method in the conventional mini-disc is a bit-by-bit method, and CLV (Constant Linear Velocity) is adopted as the disc driving method. The linear velocity of CLV is 1.2 m / s. The standard data rate at the time of recording and reproduction is 133 kB / s, and the recording capacity is 164 MB (140 MB in MD-DATA). Further, the minimum data rewrite unit (unit cluster) is composed of 36 sectors including 32 main sectors and 4 link sectors as described above.

  In addition to the conventional mini-disc, the data recording / reproducing apparatus 1 used in this specific example realizes an increase in the density of recorded data by adding improvements such as narrowing the track pitch and changing the linear velocity and modulation method. Also, it supports a next-generation mini disc provided with a normal recording area and a secret area (secure area) that can be used by authentication. Two types of next-generation minidiscs have been proposed.

  The next generation MD1 has the same physical specifications as the conventional mini-disc and the recording medium. Therefore, the track pitch is 1.6 μm, the laser wavelength λ is λ = 780 nm, and the aperture ratio of the optical head is NA = 0.45. As a recording method, a groove recording method is adopted. The address system uses ADIP. As described above, since the optical system configuration, ADIP address reading method, and servo processing in the disk drive device are the same as those of the conventional mini disk, compatibility with the conventional disk is achieved. The next generation MD1 adopts the RLL (1-7) PP modulation method (RLL: Run Length Limited, PP: Parity preserve / Prohibit rmtr (repeated minimum transition runlength)) suitable for high-density recording as the modulation method of recording data. doing. Further, as an error correction method, an RS-LDC (Reed Solomon-Long Distance Code) method with BIS (Burst Indicator Subcode) having higher correction capability is used. In the above data structure, data interleaving is a block completion type. As a result, the data redundancy becomes 20.50%. Further, a Viterbi decoding method based on PR (1, 2, 1) ML is used as a data detection method.

  A CLV system is used as the disk drive system, and its linear velocity is 2.4 m / s. The standard data rate at the time of recording / reproducing is 4.4 MB / s. By adopting this method, the total recording capacity can be set to 300 MB. Since the window margin is changed from 0.5 to 0.666 by changing the modulation method from EFM to RLL (1-7) PP, 1.33 times higher density can be realized. A cluster, which is the minimum data rewrite unit, is composed of 16 sectors and 64 kB. Since the recording modulation system is changed from the CIRC system to the RS-LDC system with BIS and the system using the difference in sector structure and Viterbi decoding, the data efficiency is increased from 53.7% to 79.5%. 48 times higher density can be realized. Taken together, the next generation MD1 can have a recording capacity of 300 MB, which is about twice that of the conventional mini-disc.

  On the other hand, the next-generation MD2 is a recording medium to which high-density recording technology such as a domain wall displacement detection method (DWDD: Domain Wall Placement Detection) is applied. The format is different. The next generation MD2 has a track pitch of 1.25 μm and a bit length of 0.16 μm / bit, and is densified in the line direction. In addition, in order to adopt compatibility with the conventional mini disk and the next generation MD1, the optical system, the reading method, the servo processing, and the like are in accordance with the conventional standards, the laser wavelength λ is λ = 780 nm, and the aperture ratio of the optical head is NA = 0.45. The recording method is a groove recording method, and the address method is a method using ADIP. The external form of the housing is the same as that of the conventional mini-disc and next-generation MD1.

  However, when reading a narrow track pitch and linear density (bit length) using a conventional mini-disc and an optical system equivalent to the next generation MD1, conventionally, crosstalk from a detrack margin, land, and groove is used. It is necessary to eliminate the constraints on wobble crosstalk, focus leakage, CT signal, and the like. Therefore, the next generation MD2 is characterized in that the groove depth, inclination, width and the like of the groove are changed. Specifically, the groove depth of the groove is determined to be 160 nm to 180 nm, the inclination is 60 ° to 70 °, and the width is 600 nm to 800 nm.

  The next generation MD2 is an RLL (1-7) PP modulation system (RLL: Run Length Limited, PP: Parity preserve / Prohibit rmtr (repeated minimum transition runlength)) suitable for high-density recording as a modulation system for recording data. Is adopted. Further, as an error correction method, an RS-LDC (Reed Solomon-Long Distance Code) method with BIS (Burst Indicator Subcode) having higher correction capability is used. Data interleaving is a block-complete type. As a result, the data redundancy becomes 20.50%. As a data detection method, a Viterbi decoding method based on PR (1, -1) ML is used. A cluster which is the minimum data rewrite unit is composed of 16 sectors and 64 kB.

  The disk drive system uses a ZCAV (Zone Constant Angular Velocity) system, and the linear velocity is 2.0 m / s. The standard data rate at the time of recording / reproducing is 9.8 MB / s. Therefore, in the next generation MD2, the total recording capacity can be reduced to 1 GB by adopting the DWDD method and this driving method.

  An example of the area structure on the board of the next generation MD1 shown in this specific example is schematically shown in FIGS. The next-generation MD1 is the same medium as a conventional mini-disc, and a PTOC (Premastered Table Of Contents) is provided as a pre-mastered area on the innermost circumference side of the disc. Here, disc management information is recorded as embossed pits due to physical structural deformation. The outer periphery of the pre-mastered area is a recordable area capable of magneto-optical recording, and is a recordable / reproducible area in which a groove as a guide groove of a recording track is formed. The innermost peripheral side of this recordable area is a UTOC (User Table Of Contents) area. In this UTOC area, UTOC information is described, a buffer area with a pre-mastered area, and output of laser light. A power calibration area used for power adjustment and the like is provided.

  As shown in FIG. 5, the next-generation MD2 does not use prepits in order to increase the density. Therefore, the next generation MD2 has no PTOC area. The next-generation MD2 has a unique ID area (UID) for recording information for copyright protection, information for checking data falsification, other non-public information, etc. in the inner peripheral area of the recordable area. Is provided. This UID area is recorded by a recording method different from the DWDD method applied to the next generation MD2.

  Note that audio data tracks and data tracks for music data can be recorded together on each disk described here. In this case, for example, as shown in FIG. 6, an audio recording area AA in which at least one audio track is recorded in the data area and a PC data recording area DA in which at least one data track is recorded are each arbitrarily set. Will be formed at the position. A series of audio tracks and data tracks are not necessarily recorded physically continuously on the disc, and may be divided into a plurality of parts and recorded. A part refers to a section that is physically continuously recorded. That is, even when there are two PC data recording areas physically separated on the disk, the number of data tracks may be one or plural.

  Next, the peripheral configuration of the media drive unit 11 and the audio data processing unit 19 in the data recording / reproducing apparatus 1 will be described in detail with reference to FIG.

  In order to record / reproduce the mini-disc 90, the media drive unit 11 performs recording on a next-generation mini-disc and a configuration for executing EFM modulation and ACIRC encoding for recording a conventional mini-disc, particularly as a recording processing system. And a configuration for executing RLL (1-7) PP modulation and RS-LDC encoding. In addition, as a playback processing system, a configuration for executing conventional EFM demodulation and ACIRC decoding for playback of mini-discs, and data detection using PR (1, 2, 1) ML and Viterbi decoding for playback of next-generation mini-discs It is characteristic that it has a configuration for executing RLL (1-7) demodulation and RS-LDC decoding based on the above.

  The media drive unit 11 rotationally drives the loaded mini disk 90 by the spindle motor 21 by the CLV method or the ZCAV method. At the time of recording / reproduction, the mini-disc 90 is irradiated with laser light from the optical head 22.

  The optical head 22 performs a high level laser output for heating the recording track to the Curie temperature during recording, and a relatively low level laser output for detecting data from reflected light by the magnetic Kerr effect during reproduction. Do. For this reason, the optical head 22 is equipped with a laser diode as a laser output means, an optical system including a polarization beam splitter, an objective lens, and the like, and a detector for detecting reflected light. The objective lens provided in the optical head 22 is held so as to be displaceable in the radial direction of the disk and in the direction of contacting and separating from the disk by, for example, a biaxial mechanism.

  In this example, the bit error rate at the time of data reading is optimized for both discs in order to obtain the maximum playback characteristics for conventional mini discs and next generation mini discs with different physical specifications on the medium surface. A phase compensation plate that can be formed is provided in the optical path of the reading light of the optical head 22.

  A magnetic head 23 is disposed at a position facing the optical head 22 with the mini disk 90 interposed therebetween. The magnetic head 23 applies a magnetic field modulated by the recording data to the mini disk 90. Although not shown, a sled motor and a sled mechanism are provided for moving the entire optical head 22 and the magnetic head 23 in the disk radial direction.

  In the media drive unit 11, a recording processing system, a playback processing system, a servo system, and the like are provided in addition to the recording / reproducing head system using the optical head 22 and the magnetic head 23 and the disk rotation driving system using the spindle motor 21. As a recording processing system, there are a part for performing EFM modulation and ACIRC encoding at the time of recording on a conventional minidisc, and a part for performing RLL (1-7) PP modulation and RS-LDC encoding at the time of recording to the next generation MD1 and next generation MD2. Provided.

  In addition, the reproduction processing system includes a part that performs demodulation and ACIRC decoding corresponding to EFM modulation during reproduction of a conventional mini-disc, and a demodulation that supports RLL (1-7) PP modulation during reproduction of the next generation MD1 and next generation MD2. (RLL (1-7) demodulation based on data detection using PR (1, 2, 1) ML and Viterbi decoding), and a part for performing RS-LDC decoding are provided.

  Information (photocurrent obtained by detecting the laser reflected light by the photodetector) detected as reflected light by the laser irradiation of the optical head 22 on the mini disk 90 is supplied to the RF amplifier 24. The RF amplifier 24 performs current-voltage conversion, amplification, matrix calculation, and the like on the input detection information, and performs reproduction RF signal, tracking error signal TE, focus error signal FE, groove information (mini disc 90) as reproduction information. (ADIP information recorded by track wobbling).

  At the time of reproducing a conventional mini disc, the reproduced RF signal obtained by the RF amplifier is processed by the EFM demodulator 27 and the ACIRC decoder 28 via the comparator 25 and the PLL circuit 26. The reproduced RF signal is binarized by the EFM demodulator 27 to form an EFM signal sequence, EFM demodulated, and further subjected to error correction and deinterleaving by the ACIRC decoder 28. If it is audio data, it will be in the state of ATRAC compression data at this time. At this time, the selector 29 has been selected for the conventional mini-disc signal side, and the demodulated ATRAC compressed data is output to the data buffer 30 as reproduction data from the mini-disc 90. In this case, the compressed data is supplied to the audio processing unit 19 in FIG.

  On the other hand, at the time of reproducing the next generation MD1 or the next generation MD2, the reproduction RF signal obtained by the RF amplifier is transmitted via the A / D conversion circuit 31, the equalizer (EQ) 32, the PLL circuit 33, and the PRML circuit 34 to the RLL ( 1-7) The signal is processed by the PP demodulator 35 and the RS-LDC decoder 36. The reproduction RF signal is obtained by the RLL (1-7) PP demodulator 35 by obtaining reproduction data as an RLL (1-7) code string by data detection using PR (1, 2, 1) ML and Viterbi decoding. The RLL (1-7) demodulation process is performed on the RLL (1-7) code string. Further, the RS-LDC decoder 36 performs error correction and deinterleave processing. In this case, the selector 29 selects the next generation MD1 or next generation MD2 side, and the demodulated data is output to the data buffer 30 as reproduction data from the minidisc 90. At this time, the demodulated data is supplied to the memory transfer controller 12 of FIG.

  The tracking error signal TE and the focus error signal FE output from the RF amplifier 24 are supplied to the servo circuit 37, and the groove information is supplied to the ADIP decoder 38.

  The ADIP decoder 38 limits the band of the groove information by a bandpass filter and extracts a wobble component, and then performs FM demodulation and biphase demodulation to extract an ADIP address. The extracted ADIP address, which is absolute address information on the disc, is passed through the MD address decoder 39 in the case of the conventional mini disc and the next generation MD1, and the next generation MD2 address decoder in the case of the next generation MD2. 40 to the drive controller 41.

  The drive controller 41 executes a predetermined control process based on each ADIP address. The groove information is returned to the servo circuit 37 for spindle servo control.

  The servo circuit 37 generates spindle error signals for CLV servo control and ZCAV servo control based on an error signal obtained by, for example, integrating the phase error with the reproduction clock (PLL clock at the time of decoding) with respect to the groove information. Generate.

  Further, the servo circuit 37 performs various servo control signals based on the spindle error signal, the tracking error signal, the focus error signal supplied from the RF amplifier 24 as described above, or the track jump command, access command, etc. from the drive controller 41. (Tracking control signal, focus control signal, thread control signal, spindle control signal, etc.) are generated and output to the motor driver 42. That is, various servo control signals are generated by performing necessary processing such as phase compensation processing, gain processing, and target value setting processing on the servo error signal and command.

  The motor driver 42 generates a predetermined servo drive signal based on the servo control signal supplied from the servo circuit 37. The servo drive signal here includes a biaxial drive signal (two types of focus direction and tracking direction) for driving the biaxial mechanism, a sled motor drive signal for driving the sled mechanism, and a spindle motor drive signal for driving the spindle motor 21. It becomes. With such a servo drive signal, focus control and tracking control for the mini-disc 90 and CLV control or ZCAV control for the spindle motor 21 are performed.

  When a recording operation is performed on the mini-disc 90, high-density data or normal ATRAC compressed data from the audio processing unit 19 is supplied from the memory transfer controller 12 shown in FIG.

  At the time of recording on the conventional mini disc, the selector 43 is connected to the conventional mini disc side, and the ACIRC encoder 44 and the EFM modulator 45 function. In this case, if it is an audio signal, the compressed data from the audio processing unit 19 is interleaved and an error correction code added by the ACIRC encoder 44 and then EFM-modulated by the EFM modulating unit 45. The EFM modulation data is supplied to the magnetic head driver 46 via the selector 43, and the magnetic head 23 applies a magnetic field based on the EFM modulation data to the mini disk 90 to record the modulated data.

  At the time of recording on the next generation MD1 and the next generation MD2, the selector 43 is connected to the next generation MD1 / next generation MD2 side, and the RS-LCD encoder 47 and the RLL (1-7) PP modulation section 48 function. In this case, the high-density data sent from the memory transfer controller 12 is subjected to interleaving and RS-LDC error correction code addition by the RS-LCD encoder 47 and then to the RLL (1-7) PP modulation unit 48. RLL (1-7) modulation.

  The recording data modulated into the RLL (1-7) code string is supplied to the magnetic head driver 46 via the selector 43, and the magnetic head 23 applies a magnetic field to the mini disk 90 based on the modulation data. Data is recorded.

  The laser driver / APC 49 causes the laser diode to perform a laser emission operation during reproduction and recording as described above, but also performs a so-called APC (Automatic Laser Power Control) operation. Specifically, although not shown, a detector for laser power monitoring is provided in the optical head 22, and this monitor signal is fed back to the laser driver / APC 49. The laser driver / APC 49 compares the current laser power obtained as a monitor signal with a preset laser power and reflects the error in the laser drive signal, thereby outputting the laser power output from the laser diode. Is controlled to be stabilized at the set value. Here, as the laser power, values as the reproduction laser power and the recording laser power are set in a register in the laser driver / APC 49 by the drive controller 41.

  Based on an instruction from the system controller 18, the drive controller 41 controls each component so that each of the above operations (access, various servos, data writing, and data reading) is executed. In addition, each part enclosed with the dashed-dotted line in FIG. 7 can also be comprised as a circuit of 1 chip | tip.

  By the way, when the mini-disc 90 is divided into a data track recording area and an audio track recording area as shown in FIG. 6, the system controller 18 determines whether the data to be recorded / reproduced is an audio track or a data track. Accordingly, the drive controller 41 of the media drive unit 11 is instructed to access based on the set recording area. It is also possible to perform control to permit recording of only one of PC data and audio data on the mounted mini disk 90 and prohibit recording of other data. That is, control can be performed so that PC data and audio data are not mixed.

  An example of a management method when content data is recorded / reproduced by the data recording / reproducing apparatus 1 with respect to the mini-disc 90 having the above specifications will be specifically described.

  Mini-discs adopting a new modulation method enable recording and reproduction of high-quality music data for a long time, so the number of songs managed on one disc is enormous. Also, this mini-disc is managed using a FAT system to achieve compatibility with a computer. However, this has the merit of improving usability, but by taking music data into HDD of computers etc., it is illegally copied illegally to other recording media, and the copyright holder may not be protected. There is sex. Therefore, this next-generation mini disc employs a data management system that can withstand use as such a so-called multimedia disc.

  8 to 24 show an example of an audio data management method. As shown in FIG. 8, a track information file and an audio data file are generated on the disc. The track information file and the audio data file are files managed by the FAT system. The track information file corresponds to encryption information related to content data. The management structure shown in FIG. 8 includes security information and content generation management information files characteristic of the next generation MD1 and the next generation MD2. As security information and content generation management information, there are EKB (Enabling Key Block) as reproduction permission information for each set that is a recording / reproducing apparatus of a recording medium, track MAC as content tampering check information, and the like.

  As shown in FIG. 9, the audio data file is a file in which a plurality of music data is stored as one file. When the audio data file is viewed with the FAT system, it looks like a huge file. A plurality of audio blocks included in the audio data file form one track. The audio data file is divided into parts, and the audio data is handled as a set of parts. The part break and the track break do not necessarily match.

  The track information file shown in FIG. 8 is a file in which various information for managing music data stored in an audio data file is described. As shown in FIG. 10, the track information file includes a play order table, a programmed play order table, a group information table, a track information table, a parts information table, and a name table.

  The play order table is a table indicating the playback order defined by default. As shown in FIG. 11, the play order table includes information INF1, INF2,... Indicating the link destination to the track descriptor (FIG. 15) of the track information table for each track number (song number). . . Is stored. The track number is a continuous number starting from “1”, for example.

  The programmed play order table is a table in which each user defines a playback procedure. In the programmed play order table, as shown in FIG. 12, information track information PINF1, PINF2,... Linked to the track descriptor for each track number. . . Is described. In the group information table, information about groups is described as shown in FIGS. A group is a set of one or more tracks having a continuous track number, or a set of one or more tracks having a continuous programmed track number. As shown in FIG. 13, the group information table is described by the group descriptor of each group. In the group descriptor, as shown in FIG. 13, the track number at which the group starts, the number of the end track, the group name, and the flag are described.

  As shown in FIGS. 15 and 16, the track information table describes information about each song. As shown in FIG. 15, the track information table is made up of track descriptors for each track (each tune). In addition, as shown in FIG. 16, each track descriptor includes an encoding method, copyright management information, content decryption key information, pointer information to a part number that is an entry at which the music starts, artist name, title name Original song order information, recording time information, and the like are described. The artist name and title name describe pointer information to the name table, not the name itself. The encoding method indicates a codec method and becomes decoding information.

  As shown in FIGS. 17 and 18, the part information table describes a pointer for accessing the actual music position from the part number. As shown in FIG. 17, the part information table is made up of part descriptors for each part. Parts are all parts of one track (music) or parts obtained by dividing one track. The entry of the parts descriptor is indicated by the track information table (FIG. 16). As shown in FIG. 18, each part descriptor describes the start address of the part in the audio data file, the end address of the part, and the link destination to the part that follows the part.

  The address used as part number pointer information, name table pointer information, and pointer information indicating the position of the audio file is a file byte offset, FAT cluster number, physical address of a disk used as a recording medium, or the like. be able to.

  The name table is a table for representing characters that are names of names. As shown in FIG. 19, the name table is composed of a plurality of name slots. Each name slot is called by being linked from each pointer indicating a name. The pointer for calling the name includes an artist name, a title name in the track information table, a group name in the group information table, and the like. Each name slot can be called from a plurality. As shown in FIG. 20, each name slot includes name data that is character information, a name type that is an attribute of the character information, and a link destination. A long name that does not fit in one name slot can be described by being divided into a plurality of name slots. If one name slot does not fit, the link destination to the name slot in which the subsequent name is described is described.

  In an example of the audio data management method in the system to which the present invention is applied, as shown in FIG. 21, when the track number to be reproduced is designated by the play order table (FIG. 11), the link destination of the track information table is specified. The track descriptor (FIG. 15) is read out, and from this track descriptor, the encoding method, copyright management information, content decryption key information, pointer information to the part number where the music starts, pointers for the artist name and title name The original music order information, the recording time information, etc. are read out.

  The part number information read from the track information table is linked to the part information table (FIGS. 17 and 18), and from this part information table, the audio of the position of the part corresponding to the start position of the track (music) is recorded. A data file is accessed. When the data of the part at the position specified in the part information table of the audio data file is accessed, the reproduction of the audio data is started from that position. At this time, decoding is performed based on the encoding method read from the track descriptor of the track information table. If the audio data is encrypted, the key information read from the track descriptor is used.

  When there is a part that follows the part, a part descriptor is described in the link destination of the part, and the part descriptor is sequentially read in accordance with the link destination. The audio data of the desired track (music) can be reproduced by following the link destination of this part descriptor and reproducing the audio data of the part at the position specified by the part descriptor on the audio data file. . Also, the name table name slot (FIGS. 19 and 20) at the position pointed to by the pointer of the artist name or title name read from the track information table is called, and the name data is read from the name slot at that position. Read out.

  As described above, a plurality of name slots in the name table can be referred to. For example, there may be a case where a plurality of music pieces of the same artist are recorded. In this case, as shown in FIG. 22, the same name table is referred to as an artist name from a plurality of track information tables. In the example of FIG. 22, the track descriptor “1”, the track descriptor “2”, and the track descriptor “4” are all music pieces of the same artist “DEF BAND”, and refer to the same name slot as the artist name. . Also, the track descriptor “3”, the track descriptor “5”, and the track descriptor “6” are all the music of the artist “GHQ GIRLS” at the same position, and refer to the same name slot as the artist name. Thus, if the name slot of the name table can be referred to from a plurality of pointers, the capacity of the name table can be saved.

  Along with this, for example, a link to this name table can be used to display information of the same artist name. For example, when it is desired to display a list of songs whose artist name is “DEF BAND”, the track descriptor referring to the address of the name slot of “DEF BAND” is traced. In this example, the track descriptor “1”, the track descriptor “2”, and the track descriptor “4” are obtained by tracing the track descriptor referring to the address of the name slot “DEF BAND”. This makes it possible to display a list of songs whose artist name is “DEF BAND” among the songs stored on the disc. Since a plurality of name tables can be referred to, no link is provided to reversely follow the track information table from the name table.

  In the case of newly recording audio data, a FAT table provides an unused area that is continuous with a desired number of recording blocks or more, for example, four recording blocks or more. The reason why a continuous area of a desired recording block or more is ensured is that there is no waste in access if audio data is recorded in a continuous area as much as possible.

  When an area for recording audio data is prepared, one new track description is allocated on the track information table, and a content key for encrypting the audio data is generated. Then, the input audio data is encrypted, and the encrypted audio data is recorded in the prepared unused area. The area where the audio data is recorded is connected to the end of the audio data file on the FAT file system.

  As new audio data is linked to the audio data file, the linked position information is created, and the newly created audio data position information is recorded in the newly reserved parts description. The Then, key information and part number are described in the newly secured track description. Further, if necessary, an artist name, a title name, and the like are described in the name slot, and a pointer linked to the artist name and the title name is described in the name description in the track description. Then, the number of the track description is registered in the play order table. Also, copyright management information is updated.

  When reproducing audio data, information corresponding to the designated track number is obtained from the play order table, and the track descriptor of the track to be reproduced is obtained.

  Key information is acquired from the track descriptor in the track information table, and a part description indicating an area in which entry data is stored is acquired. The position in the audio data file at the head of the part where the desired audio data is stored is acquired from the part description, and the data stored at that position is retrieved. Then, the data reproduced from that position is decrypted using the acquired key information, and the audio data is reproduced. If there is a link in the part description, it is specified and linked to the part, and the same procedure is repeated.

  In the case where the music piece having the track number “n” on the play order table is changed to the track number “n + m”, the track description Dn in which the information of the track is described from the track information TINFn in the play order table. Is obtained. All values (track description numbers) of the track information TINFn + 1 to TINFn + m are moved to the previous one. The number of the track description Dn is stored in the track information TINFn + m.

  When deleting a music piece having a track number “n” in the play order table, the track descriptor Dn in which the track information is described is acquired from the track information TINFn in the play order table. All the valid track descriptor numbers after the track information TINFn + 1 in the play order table are moved to the previous one. In the track information table, the encoding method and decoding key corresponding to the track are acquired from the acquired track descriptor Dn, and the number of the part descriptor Pn indicating the area where the first music data is stored is acquired. . The audio block in the range specified by the part descriptor Pn is separated from the audio data file on the FAT file system. Further, the track descriptor Dn of the track in the track information table is deleted.

  For example, in FIG. 23, parts A, B, and C have been connected so far, and part B is deleted from them. Part A and part B share the same audio block (and share the same FAT cluster), and the FAT chain is continuous. The part C is located immediately after the part B in the audio data file, but when the FAT table is examined, it is assumed that the part C is actually located away from the part.

  In the case of this example, as shown in FIG. 24, when part B is deleted, it can actually be removed from the FAT chain (returned to a free area), and the cluster is not shared with the current part. There are two FAT clusters. That is, the audio data file is shortened to 4 audio blocks. The numbers of the audio blocks recorded in the part C and the parts after it are all reduced by 4.

  It should be noted that the deletion can be performed on a part of the track instead of the entire track. When a part of the track is deleted, the remaining track information can be decrypted by using the encoding method and decryption key corresponding to the track acquired from the part descriptor Pn in the track information table. It is.

  When connecting the track n and the track n + 1 on the play order table, the track descriptor number Dn describing the information of the track is acquired from the track information TINFn in the play order table. Further, the track descriptor number Dm in which the information of the track is described is obtained from the track information TINFn + 1 in the play order table. All valid TINF values (track descriptor numbers) after TINFn + 1 in the play order table are moved to the previous TINF. By searching the programmed play order table, all the tracks referring to the track descriptor Dm are deleted. A new encryption key is generated, a part descriptor list is extracted from the track descriptor Dn, and the part descriptor list extracted from the track descriptor Dm is linked to the tail of the part descriptor list.

  When connecting tracks, compare both track descriptors to confirm that there is no problem with copyright management, obtain a parts descriptor from the track descriptor, and if both tracks are connected, there is a provision for fragments. It is necessary to confirm whether it is satisfied with the FAT table. Further, it is necessary to update the pointer to the name table as necessary.

  When the track n is divided into the track n and the track n + 1, the track descriptor number Dn in which the information of the track is described is obtained from TINFn in the play order table. The track descriptor number Dm in which the information of the track is described is acquired from the track information TINFn + 1 in the play order table. Then, all valid track information TINF values (track descriptor numbers) subsequent to TINFn + 1 in the play order table are moved to the next one. A new key is generated for the track descriptor Dn. A list of parts descriptors is taken out from the track descriptor Dn. A new part descriptor is assigned, and the contents of the part descriptor before division are copied there. The part descriptor including the dividing point is shortened until immediately before the dividing point. In addition, the link of the part descriptor after the dividing point is cut off. A new part descriptor is set immediately after the dividing point.

  Therefore, in the data recording / reproducing apparatus 1, by preparing the auxiliary writing memory 20 as the writing track encryption information memory, the content data can be managed when managing the content data by the content data management method described above. Even while the track information corresponding to the encryption information related to the data is being developed in the read track encryption information memory, the recording data can be encrypted. The created encryption information table for the newly recorded data is written back to the disk after the recording operation is completed.

  In the specific example described above, the write track encryption information memory and the read track encryption information memory are shown to be provided independently of each other, but the logical areas of the same memory are separated. There may be.

  The present invention can be applied to any data recording / reproducing apparatus capable of handling a recording medium having a file format capable of large capacity recording and having management data complicated by encrypted recording or the like.

It is a figure explaining the outline of the data recording / reproducing apparatus concerning this invention. It is a figure explaining the data recording / reproducing apparatus shown as a specific example of this invention. It is a flowchart explaining the data recording process by the said data recording / reproducing apparatus. It is a schematic diagram explaining the area structure on the disk board surface of next generation MD1 used with the said data recording / reproducing apparatus. It is a schematic diagram explaining the area structure on the disk board surface of next generation MD2 used with the said data recording / reproducing apparatus. It is a schematic diagram explaining the area configuration on the board surface when audio data and PC data are mixedly recorded on the next generation mini-disc. It is a figure explaining the periphery structure of the media drive part and audio | voice data processing part in the said data recording / reproducing apparatus. It is a figure explaining an example of the management system of audio data. It is a figure explaining the audio file by an example of the management system of audio data. It is a figure explaining the track information file by an example of the management system of audio data. It is a figure explaining the play order table by an example of the management system of audio data. It is a figure explaining the programmed play order table by an example of the management system of audio data. It is a figure explaining the group information table by an example of the management system of audio data. It is a figure explaining the group information table by an example of the management system of audio data. It is a figure explaining the track information table by an example of the management system of audio data. It is a figure explaining the track information table by an example of the management system of audio data. It is a figure explaining the parts information by an example of the management system of audio data. It is a figure explaining the parts information by an example of the management system of audio data. It is a figure explaining the name table by an example of the management system of audio data. It is a figure explaining the name table by an example of the management system of audio data. It is a figure explaining an example of the management system of audio data. It is a figure explaining that each name slot by an example of the management system of audio data can refer to two or more. It is a figure explaining the process which deletes parts from an audio data file in an example of the management system of audio data. It is a figure explaining the process which deletes parts from an audio data file in an example of the management system of audio data.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Data recording / reproducing apparatus, 2 Minidisc, 3a Read track encryption information memory, 3b Write track encryption information memory, 4 Encryption process part,
DESCRIPTION OF SYMBOLS 11 Media drive part, 12 Memory transfer controller, 13 Cluster buffer memory, 14 Reading auxiliary memory, 15, 16 USB interface, 17 USB hub, 18 System controller, 19 Voice data processing part, 20 Writing auxiliary memory

Claims (7)

Reading means for reading out the encryption information for each content unit of the content data recorded in the recording medium;
First encrypted information storage means for storing the read encrypted information;
Content acquisition means for acquiring new content data from outside;
An encryption means for encrypting the acquired content data;
Encryption information creating means for creating new encrypted information for each content unit when recording on the recording medium when content data is encrypted by the encryption means;
Second encrypted information storage means for storing the created new encrypted information;
A data recording / reproducing apparatus comprising: new encryption information stored in the second encryption information storage means; and recording means for recording the encrypted content data on the recording medium.   The encryption information for each content unit is a part that manages the encryption method, the encryption key, and the part pointer information indicating that the content unit is a part of the same file. 2. The data recording / reproducing apparatus according to claim 1, wherein the data management information includes pointer information indicating an entry in the information table.   2. The data recording / reproducing apparatus according to claim 1, wherein when the content data is music data, the content unit is a track as a delimiter for each music. A reading step of reading out encryption information for each content unit of the content data recorded in the recording medium;
A storage step of storing the read encrypted information in the first encrypted information storage means;
A content acquisition process for acquiring new content data from outside,
An encryption process for encrypting the acquired content data;
An encryption information creation step of creating new encryption information for each content unit when recording on the recording medium when content data is encrypted in the encryption step;
A storage step of storing the created new encryption information in a second encryption information storage means;
A recording step of recording the new encrypted information and the encrypted content data on the recording medium;
And a step of writing back the new encrypted information stored in the second encrypted information storage means to the recording medium.   The encryption information for each content unit is a part that manages the encryption method, the encryption key, and the part pointer information indicating that the content unit is a part of the same file. 5. The data recording / reproducing method according to claim 4, wherein the data management information includes pointer information indicating an entry to the information table.   In the reading step, one content unit is selected from the reproduction order table indicating the reproduction order of each content unit, and indicates that the encryption method, the encryption key, and a part of the same file correspond to each content unit. Read the information of the content unit corresponding to the selected content unit from the data management information table including the pointer information indicating the entry to the part information table for managing the part pointer information, and the part information table pointer information from the part information table 6. The data recording / reproducing method according to claim 5, wherein part information corresponding to the part information is read out and a part of the file corresponding to the part pointer information in the part information is read out.   5. The data recording / reproducing method according to claim 4, wherein when the content data is music data, the content unit is a track as a delimiter for each music.

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