JP2005032397A - Data write-read device, reproducing device and method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power consumption at the time of writing data in memory. <P>SOLUTION: The data write-read device is provided with a write part 50 for writing data and the information (hereafter called "data or the like") on the data in memory 4; a read part 50 for reading the data or the like when the data written in the memory 4 has reached a predetermined quantity; a calculation part 51 for calculating a time for reproducing the data based on the information concerning the data at the time of writing the data in the memory by the write part 50, and also calculating a time for reproducing the data based on the information concerning the data at the time of reading the data from the memory 4 by the read part 50; and a control part 52 for calculating a time for reproducing the data written in the memory 4 using the reproduction time calculated by the calculation part 51 as an addition amount and using the calculated reproduction time as a subtraction amount, and controlling write timing T1 by the write part 50 and read timing T2 by the read part 50 based on the calculated reproduction time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a data writing / reading device that writes data to a memory and reads the written data, and a reproducing device that reads data recorded on a recording medium, writes the read data to the memory, and reads the written data And a method.

  When a playback device receives a shock such as vibration from the outside during playback of data recorded on a recording medium (hereinafter referred to as “disk”), a track jump occurs and data (sound) is interrupted. .

  In the reproducing apparatus, a shock proof memory is provided to prevent this. FIG. 18 is a timing chart showing the operation of the shock proof memory. The playback device has a playback rate (for example, 1.4 Mbit / s) when the disc is played, about 5 times the output rate (for example, 0.3 Mbit / s) of the data output from the shock proof memory. The difference data is stored in the shock proof memory. The shock-proof memory waits until the memory usage reaches the disk access start value (MIN) when data is stored up to the maximum memory usage (MAX). A series of operations of accumulating supplied data is sequentially repeated.

  Here, for example, in the period from time T1 to time T2 in FIG. 18, when a track deviation occurs due to disturbance such as vibration (tracking servo is removed), the optical pickup is then a regular track of the disk at time T3. Assuming that the operation returns to the time period, during the period from time T1 to time T3, no data is supplied to the shock proof memory, and only the output of the stored data is continued. During this period, the data is stored in the shock proof memory. If there is no loss of data, no sound skip occurs (see Patent Document 1).

  The shock-proof memory recognizes data to be written in units of sectors, and a threshold value indicating how much data can be written is determined in units of sectors.

  In a reproducing apparatus having such a shock-proof memory, data can be reproduced from a disc on which data encoded at different encoding rates are recorded together. The playback device writes data read from the disc into the shock proof memory, and stops writing when the threshold is reached. Further, when a predetermined amount of data is written in the shock proof memory, the playback device starts reading data and performs decoding processing on the read data. Even if the size (number of sectors) of the data written in the shock proof memory is the same, the reproduction time after decoding differs if the coding rate of the data is different.

  For example, when 10 sectors of data are read from the shock proof memory, if the data is encoded at a certain coding rate, the playback time is 20 seconds, and the data is different. In the case where the data is encoded at the encoding rate of 4, the playback time is 40 seconds.

  Therefore, if the threshold value of the shock proof memory is set based on a high coding rate, the reproduction time is lower when data with a low coding rate is read than when data with a high coding rate is read. There is a problem that the amount of data in the shock-proof memory is short and the sound skipping occurs.

  Therefore, before reproducing data recorded on a disc, the playback device detects all types of encoding of the data recorded on the disc, and selects the highest coding rate from the detected encodings. The threshold value of the shock proof memory is determined on the basis of a low value (FIG. 19).

  However, since the playback apparatus writes data on the basis of the threshold value as described above, when the threshold value of the shock proof memory is viewed with the playback time, as shown in FIG. There is a problem that wasteful power is consumed because data writing starts even though data for the time remains.

  In addition, since it is impossible to manage the playback time of the data written to the shock proof memory, the display of the playback time of the data written to the shock proof memory and the threshold value once set could not be changed. .

Japanese Patent Laid-Open No. 11-53834

  The problem to be solved is that when reading data from a disc in which data encoded at different encoding rates is recorded in a mixed manner, without detecting the type of encoding of the data recorded on the disc, Data is written to the shockproof memory, and the written data is reproduced, so that useless power is not consumed.

  In order to solve the above-described problem, a data writing / reading device according to the present invention includes a writing unit that writes data and information related to the data to a memory, and a predetermined amount of data written to the memory by the writing unit. And when the data is written into the memory by the writing means, the reproduction time pt1 of the data is calculated based on the information about the data. When the data is read from the memory by the first calculating means, the second calculating means for calculating the reproduction time pt2 of the data based on the information related to the data, and the first calculating means The reproduced time pt1 is used as an addition amount, and the reproduction time pt2 calculated by the second calculating means is used as a subtraction amount. A third calculation means for calculating the reproduction time pt3 of the data, a write timing T1 by the writing means, and a read timing T2 by the read means based on the reproduction time pt3 calculated by the third calculation means. Control means for controlling, and the control means performs control so that the timing T1 and the timing T2 are not synchronized.

  In order to solve the above-described problem, the reproducing apparatus according to the present invention includes a first reading unit that reads data and information related to the data from a recording medium, the data read by the first reading unit, and the data. Writing means for writing information on the memory, and second reading means for reading data and information related to the data from the memory when the data written to the memory by the writing means reaches a predetermined amount; When writing the data into the memory by the writing means, when reading the data from the memory by the first calculating means for calculating the reproduction time pt1 of the data and the second reading means based on the information related to the data The second calculation means for calculating the reproduction time pt2 of the data based on the information related to the data and the first calculation means The third calculation means for calculating the reproduction time pt3 of the data written in the memory using the reproduced time pt1 as an addition amount and the reproduction time pt2 calculated by the second calculation means as a subtraction amount; and the third calculation means Control means for controlling the write timing T1 by the writing means and the read timing T2 by the second reading means based on the reproduction time pt3 calculated by the calculating means, and the control means includes the timing T1 Control is performed so as not to synchronize with the timing T2.

  In addition, in order to solve the above-described problem, the reproduction method according to the present invention reads data and information related to the data from a recording medium, and writes the read data and information related to the data into the memory. Based on the information related to the data, the reproduction time pt2 of the data to be read is calculated based on the information related to the data, and the reproduction time pt1 is used as an addition amount. Using the time pt2 as a subtraction amount, the reproduction time pt3 of the data written in the memory is calculated, the data and information related to the data are written to the memory based on the reproduction time pt3, and the data and the information related to the data are written from the memory. read out.

  The data writing / reading apparatus, reproducing layer apparatus and method according to the present invention write data to a memory and read the timing when a predetermined amount of data is written to the memory, and the reproduction time of the data written to the memory. Therefore, even though there is enough data for the reproducible time, data writing will not start, and the coding rate of the data recorded on the recording medium Regardless of this, the threshold value of the memory can be set optimally, so that the number of data write operations can be reduced and power consumption can be reduced.

  Hereinafter, a recording / reproducing apparatus and a recording / reproducing method thereof according to an embodiment of the present invention will be described.

  In this embodiment, as an example, it is assumed that it corresponds to a recording / reproducing system (mini disk system) for a mini disk (MD) which is a magneto-optical disk on which data recording is performed by a magnetic field modulation method. The explanation is as follows. 1. Disc specifications and area structure 2. Disk management structure UTOC, 4. 4. Cluster structure, 5. Realization example of FAT file system in data track; The order of the configuration of the recording / reproducing apparatus will be described.

1. Disc Specifications and Area Structure The disc employed in the present embodiment can record audio data on a mini disc type disc based on a predetermined disc format, and can record various data for computer use, for example. In this specification, the terms “audio track”, “data track”, “MD audio data”, and “high-density data” are used for distinction in explanation.

  An “audio track” is one section of audio data in the mini-disc system, and corresponds to, for example, one piece of music. The audio data recorded as the audio track is data compressed by the ATRAC (Adaptive Transform Acoustic Coding) compression method and modulated by the “first modulation method” as the ACIRC error correction method and EFM modulation. The audio data according to the first modulation method recorded on the “audio track” is referred to as “MD audio data”.

  The “data track” is a section (track) in which general-purpose data that can be used in, for example, a personal computer or a distribution system is recorded. As will be described in detail later, a general-purpose file system such as a FAT file system is constructed in the “data track”. There are various types of data to be recorded, such as software data for computer use, application programs, text files, image (video / still image) files, audio data files such as music, etc. Available.

  These various data are recorded as data by the “second modulation method” that realizes high-density recording by using RLL (1-7) PP modulation, RS-LDC error correction method, and Viterbi demodulation method. The data according to the second modulation method recorded on the “data track” is referred to as “high density data”.

  FIG. 1 shows a comparison between audio mini-discs (and MD-DATA) and disc standards employed in this embodiment. As a format of the mini disk (and MD-DATA), the track pitch is 1.6 μm and the bit length is 0.59 μm / bit. The laser wavelength λ is 780 nm, and the aperture ratio NA of the optical head is 0.45.

  As a recording method, a groove recording method is adopted. That is, the groove (groove on the disk surface) is used as a track for recording and reproduction.

  As an addressing method, a single spiral groove (track) is formed, and a wobbled groove in which wobbles as address information are formed on both sides of the groove is used.

  In the present specification, the absolute address recorded by wobbling is also referred to as ADIP (Address in Pregroove).

  An EFM (8-14 conversion) system is adopted as a recording data modulation system. As an error correction method, ACIRC (Advanced Cross Interleave Reed-Solomon Code) is adopted, and a convolution type is adopted for data interleaving. The data redundancy is 46.3%.

  The data detection method is a bit-by-bit method. As a disk drive system, CLV (Constant Linear Velocity) is adopted, and the linear velocity of CLV is set to 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). A data unit called a cluster is a minimum data rewrite unit. This cluster is composed of 36 sectors including 32 main sectors and 4 link sectors.

  On the other hand, the disc employed in this example has a track pitch of 1.3 μm and a bit length of 0.16 μm / bit, both of which are shorter than the audio mini-disc.

  However, the laser wavelength λ = 780 nm, the aperture ratio NA = 0.45 of the optical head, the recording method is a groove recording method, and the addressing method is to form a groove (track) by a single spiral, and to both sides of this groove Thus, a system using a wobbled groove in which wobbles as address information are formed is adopted. In other words, these points are the same as those of the audio mini-disc, and the optical system configuration, ADIP address reading method, and servo processing in the recording / reproducing apparatus are the same, so compatibility is maintained.

  As a recording data modulation system, an RLL (1, 7) PP system (RLL: Run Length Limited, PP: Parity preserve / Prohibit rmtr (repeated minimum transition runlength)), which is considered to be suitable for high-density recording, is adopted and an error occurs. As a correction method, a RS-LDC (Reed Solomon-Long Distance Code) method with a BIS (Burst Indicator Subcode) having a higher correction capability is used. A block-complete type is used for data interleaving. Data redundancy is 20.50%. The data detection method is a Viterbi decoding method using a partial response PR (1, 2, 1) ML.

  The disk drive system is CLV, the linear velocity is 2.7 m / s, and the standard data rate during recording / reproduction is 614 kB / s. As the recording capacity, 297 MB can be obtained. By changing the modulation method from EFM to RLL (1,7) PP method, the window margin is changed from 0.5 to 0.666. In this respect, a 1.33 times higher density can be realized.

  In addition, since the physical format is changed from the CIRC system to the RS-LDC system with BIS and the system using the sector structure difference and Viterbi decoding, the data efficiency is changed from 53.7% to 79.5%. 1.48 times higher density can be realized.

  Overall, the data capacity is 1.97 times (about twice). That is, the recording capacity can be about 297 MB, which is about twice that of the audio mini-disc. A cluster which is a minimum data rewrite unit is composed of 16 sectors.

  As described above, the disc employed in this embodiment can record both audio tracks and data tracks. When the audio track is recorded on the disc employed in this embodiment, the MD audio data modulation method is the EFM modulation and ACIRC method as shown in the audio mini-disc.

  Examples of various area structures on the disk employed in this embodiment are schematically shown in FIGS. As shown in FIG. 2, FIG. 3, and FIG. 4, the innermost periphery of the disk is a PTOC (pre-mastered TOC) area, which is a pre-mastered area as a physical structure. That is, this is an area where reproduction-only data by emboss pits is recorded, and PTOC which is management information is recorded as the reproduction-only data.

  The outer periphery from the pre-mastered area is a recordable area (a magneto-optical recordable area), which 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 area. Although detailed explanation is omitted, in the UTOC area, a buffer area with the pre-mastered area, a power calibration area used for adjusting the output power of the laser beam, and the like are provided. UTOC data is repeatedly recorded three times in the three cluster sections.

  Although details of the contents of the UTOC will be described later, a data format is defined in each of 32 main sectors (SC00 to SC1F) in one cluster (ADIP cluster described later), and predetermined management information is recorded respectively. That is, the address of each track recorded in the program area, the address of the free area, etc. are recorded, and the UTOC sector is defined so that information such as the track name and recording date and time associated with each track can be recorded. .

  In the recordable area, the outer peripheral side from the UTOC area is a data area, and this data area is an area used for recording an audio track or a data track.

  As a usage mode of the data area in the disc employed in the present embodiment, it is possible to record mixed audio tracks and data tracks at random.

  In this case, as shown in FIG. 2, for example, in the data area, an audio recording area AA in which one or a plurality of audio tracks are recorded and a high-density data recording area DA in which one or a plurality of data tracks are recorded are Each is formed at an arbitrary position. As will be described later in the description of UTOC, one audio track and one data track do not necessarily have to be physically continuously recorded on the disc, but a plurality of parts (parts are physically It may be divided into sections that are continuously recorded). Therefore, for example, even when two high-density data recording areas DA that are physically separated exist as shown in FIG. 2, the number of data tracks may be one or plural.

  Further, as another usage mode of the data area in the disc employed in the present embodiment, it is conceivable to divide the area where the audio track is recorded and the area where the data track is recorded. For example, this is a case where the area is divided and set in advance by PTOC management, or the area is divided by initialization / formatting before using the disk. In this case, as shown in FIG. 3, for example, a high-density data recording area DA in which one or more data tracks are recorded is set on the inner circumference side of the disc, and one or more audio tracks are recorded on the outer circumference side of the disc. An audio recording area AA is set. In this way, when the high-density data recording area DA and the audio recording area AA are divided and set on the disc, the recording / reproducing apparatus corresponds respectively depending on whether the recording / reproduction target is MD audio data or high-density data. Recording / reproduction is performed by accessing the area.

  In contrast to the case of FIG. 2, the area setting may be a high-density data recording area DA on the outer circumference side of the disk and an audio recording area AA on the inner circumference side of the disk, or a plurality of physically separated high-density areas. A data recording area DA and a plurality of audio recording areas AA that are also physically separated may be formed. However, if the high-density data recording area DA is set on the inner peripheral side as shown in FIG. 2, it is advantageous in terms of access. In the data track recorded in the high-density data recording area DA, for example, data for computer use is recorded. In this case, access is often performed repeatedly in a shorter data section than in the case of MD audio data. is assumed. Here, the disk employed in the present embodiment is a CLV system, and considering that the time required for one disk rotation on the inner circumference side is shorter, the inner circumference side has a disk rotation waiting time for access. This means that it is shortened compared to the outer peripheral side, that is, the access time can be shortened.

  Further, as another usage mode of the data area in the disk employed in this embodiment, as shown in FIG. 4, the entire data area may be a high-density data recording area DA in which data tracks are recorded. Conceivable.

  As shown in FIG. 2, when the audio track and the data track can be arbitrarily mixedly recorded, only the data track is recorded as a result, and the state shown in FIG. Thus, it may be a dedicated disk for recording data tracks.

2. Disk Management Structure The disk management structure employed in this embodiment will be described with reference to FIG. As described above, as the management information, first, PTOC and UTOC adopted in a normal mini-disc system are recorded. The PTOC is recorded by pits as information that cannot be rewritten. In this PTOC, the basic disc management information includes the total disc capacity, the UTOC position in the UTOC area, the position of the power calibration area, the start position of the data area, the end position of the data area (leadout position), and the like. It is recorded.

  On the other hand, the UTOC recorded in the recordable area is management information that is rewritten in accordance with recording / erasing of a track (audio track / data track), and the start position and end position of each track (parts constituting the track). And manage modes. It also manages a free area in which no track is recorded in the data area, that is, a part as a writable area.

  FIG. 5 shows, as an example, a state in which three audio tracks and one data track exist in the data area. In this case, UTOC manages these four tracks in total.

  The three audio tracks are, for example, three pieces of music data, which are tracks of MD audio data that is compressed by ATRAC and modulated by the ACIRC and EFM methods (first modulation method). Note that UTOC and PTOC are also recorded in a format that conforms to a predetermined disk system, that is, data as UTOC and PTOC is data of the first modulation format.

  On the other hand, the data track is a track formed by high-density data modulated by the RS-LDC and RLL (1-7) PP method (second modulation method). As will be described later, on the UTOC, the entire data track is managed as one track that does not depend on the MD audio data. That is, from the UTOC, one or a plurality of part positions as a whole of the data track on the disk are managed.

  As will be described later, the data track is configured with a high-density data cluster described later as a minimum recording unit. In the data track, a cluster attribute table (hereinafter referred to as “CAT”) for managing high-density data clusters included in the data track is recorded. In CAT, attributes (such as disclosure / impossibility, normal / defective, etc.) for each of the high-density data clusters constituting the data track are managed.

  Using a high-density data cluster that cannot be disclosed in this data track, a unique ID (UID) unique to the disk and a hash value (hash) for checking data tampering are used for copyright protection etc. Is recorded. Of course, various other types of non-public information may be recorded. It is assumed that only a specially authorized device can access this non-disclosure area.

  An area (exportable area) that can be disclosed within a data track is an area that can be used as a recording area by an external computer or the like via a general-purpose data interface such as USB or SCSI. It is said. For example, FIG. 5 shows a state in which a FAT file system is constructed in the exportable area using data files of FAT and FAT management.

  In other words, the data recorded in the exportable area is not managed by the UTOC, but is managed by general-purpose management information such as FAT, and can be recognized by an external computer or the like that does not conform to the mini-disc system. It becomes.

  A plurality of data tracks having such a structure may be recorded on the disc. In this case, each data track is managed as one track from the UTOC, and the data in the exportable area in each data track is managed by FAT or the like. For example, each data track has its own FAT file system. Alternatively, one FAT file system may be recorded over a plurality of data tracks.

  In addition, the information such as the unique ID is described as an example in which data is in the data track and is not FAT-managed, but may be recorded in any logical form as long as the information is not FAT-managed. For example, a track for private information may be provided as a track managed directly from the UTOC, or may be recorded in the UTOC / PTOC. Furthermore, a recording area for non-public information may be provided by using a portion not used for UTOC in the UTOC area.

3. UTOC
A UTOC management method will be described. In the UTOC, a track based on MD audio data and a data track based on high-density data recorded on a disc are managed in units of tracks.

  In a predetermined disk system, ADIP by a wobbling groove is given as a physical address, and data of an audio track (track such as music in a mini disk system) is defined by a cluster defined by ADIP (hereinafter “ADIP cluster”). Is the minimum rewriting unit.

  Although the structure of this cluster will be described later, one ADIP cluster is composed of 36 sectors (2352 byte ADIP sectors) of 32 main sectors and 4 link sectors. The physical address as ADIP is given in units of sectors. That is, the physical address includes an ADIP cluster address as an upper value and an ADIP sector address as a lower value.

  UTOC data is recorded in a specific ADIP cluster in the UTOC area described above. The contents of UTOC data are defined for each sector in the ADIP cluster. UTOC sector 0 (the first ADIP sector in the ADIP cluster) manages parts as tracks and free areas. UTOC sector 1 and sector 4 manage character information corresponding to the track.

  The UTOC sector 2 manages the recording date and time corresponding to the track. Here, the description of sector 1, sector 2, and sector 4 is omitted, and UTOC sector 0 is described.

  The UTOC sector 0 is an audio track such as recorded music, a free area in which a new track can be recorded, and a data area in which management information about the data track is recorded. For example, when recording a track on a disk, the recording / reproducing apparatus searches for a free area on the disk from UTOC sector 0 and records data (MD audio data or high-density data) here. become. At the time of reproduction, an area in which a track to be reproduced is recorded is determined from UTOC sector 0, and the area is accessed to perform a reproduction operation.

  FIG. 6 shows the structure of UTOC sector 0. In the data area of TOC sector 0 (2352 bytes (4 bytes × 588)), a synchronization pattern formed by arranging 1 byte data of all 0s or all 1s at the head position is recorded.

  Subsequently, as a value corresponding to the ADIP address, an address to be a cluster address (Cluster H) (Cluster L) and a sector address (Sector) is recorded over 3 bytes, and further 1 byte of mode information (MODE) is added. Collective header. The 3-byte address here is the address of the sector itself.

  Next, at the specified byte position, manufacturer code, model code, track number of the first track (First TNO), track number of the last track (Last TNO), sector usage status (Used sectors), disk serial number, disk ID, etc. Data is recorded.

  In addition, various pointers (P-DFA, P, etc.) are used as pointer parts in order to identify the areas of tracks (music pieces, etc.) and free areas recorded by the user by associating them with the table parts described later. -EMPTY, P-FRA, P-TNO1 to P-TNO255) are recorded.

  In addition, 255 parts tables (01h) to (FFh) are provided as table parts to be associated with the pointers (P-DFA to P-TNO255). Each part table has a starting point for a certain part. Start address, end address to be terminated, and mode information (track mode) of the part are recorded. The start address and end address are values corresponding to cluster / sector addresses as ADIP addresses. In addition, since the parts shown in each part table may be connected to other parts in succession, link information indicating the part table in which the start address and end address of the connected part are recorded can be recorded. Has been. Note that a part refers to a track portion in which data is physically continuously recorded in one track. The addresses indicated as the start address and the end address are addresses indicating one or a plurality of parts constituting one musical piece (track).

  In this type of recording / reproducing apparatus, the data of a track such as one musical piece is physically discontinuous, that is, even if it is recorded over a plurality of parts, it is reproduced while being accessed while being accessed between parts. Since there is no hindrance, the music recorded by the user may be divided into a plurality of parts for the purpose of efficient use of the recordable area.

  Therefore, link information is provided. For example, the part tables can be connected by specifying the part tables to be connected by the numbers (01h) to (FFh) given to the respective part tables. That is, in the table part in the UTOC sector 0, one part table represents one part. For example, for a music composed of three parts connected, three part tables connected by link information. To manage the position of the part.

  Actually, the link information is indicated by a numerical value that is a byte position in the UTOC sector 0 by a predetermined calculation process. That is, the part table is designated as 304+ (link information) × 8 (byte).

  Each part table from (01h) to (FFh) in the table part of UTOC sector 0 is as follows according to the pointers (P-DFA, P-EMPTY, P-FRA, P-TNO1 to P-TNO255) in the pointer part. The contents of the parts are shown as follows.

  The pointer P-DFA indicates a defective area on the disc. One part table or a head part table in a plurality of part tables indicating a track portion (= part) that becomes a defective area due to a scratch or the like is shown. It is specified. That is, when there is a defective part, any one of (01h) to (FFh) is recorded in the pointer P-DFA, and the corresponding part table indicates the defective part by the start and end addresses. . When there are other defective parts, other part tables are designated as link information in the parts table, and the defective parts are also indicated in the parts table. If there is no other defective part, the link information is set to “00h”, for example, and there is no link thereafter.

  The pointer P-EMPTY indicates the head part table of one or a plurality of unused part tables in the table section. When there is an unused part table, the pointer P-EMPTY is (01h) Any one of (FFh) is recorded.

  When there are multiple unused part tables, the part tables are specified sequentially by link information from the part table specified by the pointer P-EMPTY, and all unused part tables are linked on the table part. .

  The pointer P-FRA indicates a free area (including an erase area) in which data on the disk is writable, and is in one or more parts tables in which a track portion (= part) to be a free area is indicated. The first part table of is specified. In other words, when there is a free area, any one of (01h) to (FFh) is recorded in the pointer P-FRA, and the part table corresponding to it is indicated by the start and end addresses. Has been. Further, when there are a plurality of such parts, that is, there are a plurality of parts tables, the part information in which the link information becomes “00h” is sequentially specified by the link information.

  FIG. 7 schematically shows the management state of the parts that become free areas using the parts table. This is because when parts (03h) (18h) (1Fh) (2Bh) (E3h) are free areas, this state follows the pointer P-FRA and the parts table (03h) (18h) (1Fh) (2Bh ) (E3h) indicates the state represented by the link. The management form of the above-described defective area and unused parts table is the same as this.

  Pointers P-TNO1 to P-TNO255 indicate the tracks recorded on the disk. For example, the pointer P-TNO1 is the head of one or a plurality of parts in which data of the first track is recorded. The part table that shows the parts to be specified is specified. For example, if the music set as the first track (audio track) is recorded on the disc without being divided, that is, recorded as one part, the recording area of the first track is indicated by the pointer P-TNO1. Recorded as start and end addresses in the parts table shown.

  Also, for example, when a music piece that is designated as the second track (audio track) is discretely recorded on a plurality of parts on the disc, each part follows the temporal order to indicate the recording position of the second track. It is specified. That is, from the part table specified by the pointer P-TNO2, other part tables are sequentially specified by the link information in accordance with the temporal order, and are linked to the part table having the link information of “00h” (the above, The same form as FIG. 7). In this way, for example, all the parts in which the data constituting the second music is recorded are sequentially designated and recorded, so that the data of the UTOC sector 0 is used to reproduce the second music or the area of the second music. When performing overwriting recording, it is possible to access the recording / reproducing head to extract continuous music information from discrete parts, or to record using the recording area efficiently.

  When a data track is recorded, the start address, end address, and track mode of the data track are recorded in a parts table specified by a certain pointer P-TNOx. Of course, when the data track is composed of a plurality of parts, a plurality of parts tables are linked and managed by link information as in the case of the audio track.

By the way, each part table records a 1-byte track mode, which is track attribute information. Assuming that 8 bits constituting one byte are d1 (MSB) to d8 (LSB), this track mode is defined as follows.
d1... 0: Write protected (overwrite erase, edit prohibited), 1: Write permitted d2... 0: Copyrighted, 1: No copyright d3... 0: Original, 1: First generation or higher d4 ... 0: audio data, 1: other d5, d6 ... 01: normal audio, other: undefined d7 ... 0: monaural, 1: stereo d8 ... 0: emphasis off, 1: emphasis On Here, in the track mode of the parts table for the audio track, d4 = 0 is set, indicating that the track is based on MD audio data. On the other hand, in the track mode of the parts table for the data track, d4 = 1 indicates that the track is not based on MD audio data. In this embodiment, d4 = 1 is information indicating that the data track is high-density data.

  FIG. 8 shows various examples of track management by UTOC. FIGS. 8A, 8B, and 8C show a case where an audio track and a data track can be recorded at an arbitrary position on the data area as shown in FIG.

  FIG. 8A shows a case where the tracks TK1 and TK3 managed by the UTOC sector 0 are audio tracks and the track TK2 is a data track. In this case, the start address, end address, and track mode of the audio track TK1 are described in the parts table indicated by the pointer P-TNO1. Also, the start address, end address, and track mode of the data track TK2 are described in the parts table indicated by the pointer P-TNO2. In this track mode, d4 = 1.

  The start address, end address, and track mode of the audio track TK3 are described in the parts table indicated by the pointer P-TNO3. In addition, the start address and end address of the free area are described in the parts table indicated by the pointer P-FRA.

  FIG. 8B shows a case where the track TK1 managed by the UTOC sector 0 is a data track, and this data track is formed by two parts TK1-1 and TK1-2.

  In this case, the start address, end address, and track mode of the first part TK1-1 of the data track TK1 are described in the part table indicated by the pointer P-TNO1, and the data track is displayed in the part table linked from the part table. The start address, end address, and track mode of the second part TK1-2 of TK1 are described. In these parts tables, d4 = 1 of the track mode is set.

  FIG. 8C shows a case where two tracks TK1 and TK3 managed by the UTOC sector 0 are data tracks. In this case, the start address, end address, and track mode of the data track TK1 are described in the parts table indicated by the pointer P-TNO1. Further, the start address, end address, and track mode of the data track TK3 are described in the parts table indicated by the pointer P-TNO3. In these parts tables, d4 = 1 of the track mode is set.

  FIG. 8D shows a state where, for example, the audio recording area AA and the high-density data recording area DA are divided and set in the data area as shown in FIG. 3, and the data is recorded as the track TK1 on the inner peripheral side. This is a case where a track is recorded and audio tracks TK2 and TK3 are recorded on the outer peripheral side. In this case, the start address, end address, and track mode of the data track TK1 are described in the parts table indicated by the pointer P-TNO1.

  FIGS. 8E and 8F are examples in the case where the entire data area is the high-density data recording area DA as shown in FIG. 4, for example. FIG. 8E shows an example in which one data track TK1 over the entire data area is recorded. In this case, the start address, end address, and track mode of the data track TK1 are described in the parts table indicated by the pointer P-TNO1. FIG. 8F shows an example in which two data tracks TK1 and TK2 are recorded in the data area. In this case, the start address, end address and track mode of the data track TK1 are described in the parts table indicated by the pointer P-TNO1, and the start address, end address and track of the data track TK2 are described in the parts table indicated by the pointer P-TNO2. A mode is described.

  As shown in these examples, depending on the UTOC, audio tracks are managed in units of tracks, and data tracks are also managed in units of the tracks. As described above, actual management within the data track is performed by, for example, building a FAT file system.

4). Cluster structure Next, the cluster structure employed in the disk employed in this embodiment will be described.

  The audio mini-disc system employs a cluster / sector structure corresponding to a physical address as ADIP, and the cluster / sector structure is used as it is for recording and reproduction of audio tracks even in the disk employed in this embodiment. .

  First, the cluster / sector structure corresponding to this ADIP will be described with reference to FIGS. In the present specification, for the sake of descriptive distinction, clusters / sectors corresponding to ADIP are referred to as “ADIP clusters” and “ADIP sectors”. As will be described later, regarding the recording / reproducing of the data track, different cluster / sector structures are adopted, which are referred to as “high density data cluster” and “high density data sector”.

  For MD audio data, a data stream for each unit called ADIP cluster is formed as recording data. On the recording track in the mini-disc system, as shown in FIG. 9B, a cluster CL (CL # (n), CL # (n + 1)... Are continuously formed, and one ADIP cluster is a minimum unit when MD audio data is recorded.

  One ADIP cluster CL is formed of four link sectors shown as ADIP sectors SCFC to SCFF in FIG. 9A and 32 main sectors shown as ADIP sectors SC00 to SC1F. That is, one ADIP cluster is composed of 36 ADIP sectors. One ADIP sector is a data unit formed of 2352 bytes.

  The link sectors SCFC to SCFF can be used for recording a buffer area as a break of recording operation, various operation adjustments, or recording information set as sub-data.

  The above-described recording of PTOC data, UTOC data, MD audio data, etc. is performed in the 32-sector main sectors SC00 to SC1F. The link sector and the main sector are physically the same.

  Here, when data tracks are recorded on a disk having such a physical cluster / sector structure, that is, a high density in which the linear density of data recording is higher than that of MD audio data by the above-described second modulation method. Consider the case of recording data.

  When high-density data having a high linear density is recorded, the address obtained from ADIP originally recorded on the disc does not match the address of the signal actually recorded. Random access is performed based on the ADIP address. However, in the case of data reading, it is only necessary to read the recorded data by accessing an approximate position based on the ADIP address. Don't be. However, in the case of data writing, unless data is written by accessing an accurate position, there is a possibility that already recorded data is erased by overwriting. Needless to say, access to an accurate position during reproduction is preferable for rapid data reading.

  Therefore, it is appropriate that the high-density data cluster / high-density data sector for recording / reproducing high-density data can be accurately grasped from the ADIP address. Therefore, a high-density data cluster can be grasped as a data unit obtained by converting the ADIP address molded and recorded on the disc according to a predetermined rule.

  Further, in this case, an integral multiple of the ADIP sector that is an ADIP address unit is made to be a high-density data cluster. This makes it possible to always start writing at the same timing after obtaining the ADIP address from the disk when recording high-density data at an arbitrary position.

  Also, an integer number of high-density data clusters are included in an ADIP cluster that is an ADIP address unit. Then, the address conversion rule from the ADIP cluster address to the high-density data cluster address is simplified, and the conversion circuit or software configuration can be simplified.

  FIGS. 9C and 9D show an example in which two high-density data clusters are written in one ADIP cluster based on such a concept. As shown in FIG. 9C, each high-density data cluster dCL (dCL # (2n), dCL # (2n + 1)...) Is formed in a ½ ADIP cluster section. That is, 2 high density data cluster sections = 1 ADIP cluster section, and 18 ADIP sector sections = 1 high density data cluster section.

  Therefore, in a certain section (part), the offsets of the two high-density data clusters recorded in the ADIP cluster CL # (n) where the number of ADIP clusters from the top (= ADIP cluster offset) is #n are # 2n, # 2n + 1. That is, as shown in FIGS. 9B and 9C, the high-density data clusters dCL # (2n) and dCL # (2n + 1) are recorded in the ADIP cluster CL # (n). The high-density data cluster dCL # (2n) is a section of the ADIP sectors SCFC to SC0D in the ADIP cluster CL # (n), and the high-density data cluster dCL # (2n + 1) is the ADIP sector SC0E to the ADIP cluster CL # (n). SC1F section.

  Such a high-density data cluster is a minimum rewrite unit for high-density data. The high-density data cluster has a structure including 16 high-density data sectors. That is, as shown in FIG. 9 (d), one high-density data cluster section has a preamble formed at the front end and a postamble formed at the rear end, and 16 high-density data clusters are formed between the preamble and the postamble. Density data sectors dSC # 0 to dSC # 15 are arranged.

  One high-density data sector is, for example, 4096 bytes. This high density data sector is not directly correlated with the ADIP address. Although FIG. 9 shows an example in which two high-density data clusters are arranged in one ADIP cluster, it is possible to arrange three or more high-density data clusters in one ADIP cluster. Of course, one high-density data cluster is not limited to a section of 18 ADIP sectors.

  These can be determined according to various design conditions such as the difference in data recording density between the first modulation method and the second modulation method, the number of sectors constituting the high-density data cluster, and the setting of the size of one sector. Good.

5. Example of Realization of FAT File System in Data Track An example of the structure of a data track in which various data is recorded as high-density data will be described with reference to FIG. As described in FIG. 5, the data track has an area that is released to an external computer device or the like as an exportable area, and a private area is set for the outside so that a unique ID or A hash value is recorded. Further, the high-density data cluster constituting the data track is managed by a cluster attribute table (CAT). FIG. 10 shows an example in which the FAT file system is realized in the exportable area.

  In this example, as shown in FIGS. 10D and 10E, it is assumed that one data track is recorded on the disc in a state managed as two parts in the UTOC. It is assumed that the first part of the data track is a section of ADIP clusters # 0 to # 2 and the second part is a section of ADIP cluster # 3. In this case, the two parts are physically separated as shown schematically in FIG.

  This data track is formed by four ADIP clusters. In the case of the cluster structure described with reference to FIG. 9, data is recorded by eight high-density data clusters # 0 to # 7 shown in FIG. A track will be constructed.

  The high-density data clusters # 0 to # 7 are managed by the CAT. The high-density data cluster by the CAT is the exportable area shown in FIG. 5, and the high-density data cluster is an area that is not visible from the outside (hidden ( Secure) data area). In this example, the high-density data cluster # 0 is set as a hidden data area, and a disk ID or hash value as a unique ID is recorded here. In this example, the high-density data clusters # 1 to # 7 are used as the exportable area.

  This exportable area is an area that can be freely accessed from an external computer device or the like via an interface such as USB or SCSI. The unit of writing / reading in the exportable area is generally 512 bytes, 1024 bytes, 2048 bytes, etc., and is smaller than the high-density data cluster which is a data track rewriting unit.

  The method of using the exportable area depends on the OS of the connected computer, but in this example, the FAT file system is recorded in the exportable area.

  That is, as shown in FIG. 10B, for example, 8192-byte FAT clusters # 0 to # 55 are formed. One FAT cluster is formed of four FAT sectors # 0 to # 3 each having 2048 bytes. The FAT sector and FAT cluster here are units handled in the FAT file system, and do not depend on the above-mentioned ADIP cluster, high-density data cluster, ADIP sector, or high-density data sector. For example, in the FAT clusters # 0 to # 55, a FAT file system composed of data files by FAT and FAT management is stored.

  In the FAT file system, data is handled in units of FAT sectors on the computer. However, since the rewrite unit for the disk is a high-density data cluster, for example, even when a certain FAT sector is rewritten, the rewrite on the disk is performed in the unit of the high-density data cluster including the FAT sector. It will be.

  For example, writing / reading of FAT sector data to / from a FAT file system recorded as a data track on the disk will be described later.

  The unique ID and hash value recorded in the high-density data cluster # 0 set as the hidden data area are used for authentication, falsification check, and the like for the data of the FAT file system. In addition, writing / reading to / from the hidden data area can be performed only by a specific device, but in that case, encryption is performed after mutual authentication determined separately.

  In FIG. 10, the first high-density data cluster # 0 is the hidden data area, but of course, any high-density data cluster constituting the data track may be the hidden data area.

6). Configuration of Recording / Reproducing Device The configuration of the recording / reproducing device corresponding to the disc employed in this embodiment will be described with reference to FIGS. FIG. 11 shows that the recording / reproducing apparatus 1 according to the present invention can be connected to, for example, a personal computer 100.

  The recording / playback apparatus 1 includes a media drive unit 2, a memory transfer controller 3, a cluster buffer memory 4, an auxiliary memory 5, USB interfaces 6 and 8, a USB hub 7, a system controller 9, and an audio processing unit 10.

  The media drive unit 2 performs recording / reproduction with respect to the loaded disk 90 employed in the present embodiment. The internal configuration of the media drive unit 2 will be described later with reference to FIG.

  The memory transfer controller 3 controls delivery of playback data from the media drive unit 2 and recording data supplied to the media drive unit 2. Based on the control of the memory transfer controller 3, the cluster buffer memory 4 performs buffering of data read from the data track of the disk 90 by the media drive unit 2 in units of high-density data clusters. The auxiliary memory 5 stores various management information and special information read from the disk 90 by the media drive unit 2 based on the control of the memory transfer controller 3. That is, UTOC data, CAT data, unique ID, hash value, etc. are stored.

  The system controller 9 performs overall control in the recording / reproducing apparatus 1 and also performs communication control with the connected personal computer 100. That is, the system controller 9 can communicate with the personal computer 100 connected via the USB interface 8 and the USB hub 7, receives commands such as write requests and read requests, status information, and other necessary information. And so on.

  The system controller 9 instructs the media drive unit 2 to read management information from the disk 90 in response to, for example, loading the disk 90 into the media drive unit 2, and the management information read by the memory transfer controller 3. Is stored in the auxiliary memory 5.

  The system controller 9 can grasp the track recording state of the disk 90 by reading the management information of the PTOC and UTOC, and can grasp the high-density data cluster structure in the data track by reading the CAT. The access request to the data track from 100 can be handled. Also, disk authentication and other processes can be performed using the unique ID and hash value, or these values can be transmitted to the personal computer 100 for processing.

  When there is a read request for a FAT sector from the personal computer 100, the system controller 9 causes the media drive unit 2 to read a high-density data cluster including the FAT sector. The read high-density data cluster is written into the cluster buffer memory 4 by the memory transfer controller 3. However, when the data of the FAT sector has already been stored in the cluster buffer memory 4, reading by the media drive unit 2 is not necessary. Then, the system controller 9 reads out the requested FAT sector data from the data of the high-density data cluster written in the cluster buffer memory 4 and transmits it to the personal computer 100 via the USB interface 6 and the USB hub 7. To control.

  When there is a write request for a FAT sector from the personal computer 100, the system controller 9 first causes the media drive unit 2 to read a high-density data cluster including the FAT sector. The read high-density data cluster is written into the cluster buffer memory 4 by the memory transfer controller 3. However, when the data of the FAT sector has already been stored in the cluster buffer memory 4, reading by the media drive unit 2 is not necessary. Then, the system controller 9 supplies the FAT sector data (recording data) from the personal computer 100 to the memory transfer controller 3 via the USB interface 6 and rewrites the data of the corresponding FAT sector on the cluster buffer memory 4. Let it run.

  Then, the system controller 9 instructs the memory transfer controller 3 to store the data of the high-density data cluster stored in the cluster buffer memory 4 in a state where necessary FAT sectors are rewritten as recording data in the media drive unit 2. To be transferred. In the media drive unit 2, the recording data of the high-density data cluster is modulated by the second modulation method and written to the disk 90.

  The above is the control for recording / reproducing the data track, and the data transfer at the time of recording / reproducing the MD audio data (audio track) is performed via the audio processing unit 10.

  Here, the configuration of the media drive unit 2 having a function of recording and reproducing both the data track and the audio track will be described with reference to FIG.

  In the media drive unit 2, the loaded disk 90 is rotationally driven by the spindle motor 29 by the CLV method. The disk 90 is irradiated with laser light by the optical head 19 during recording / reproduction.

  The optical head 19 performs a high level laser output for heating the recording track to the Curie temperature during recording, and a relatively low level laser for detecting data from reflected light by the magnetic Kerr effect during reproduction. Output. Therefore, although not shown in detail here, the optical head 19 is equipped with a laser diode as a laser output means, an optical system including a polarizing beam splitter, an objective lens, and the like, and a detector for detecting reflected light. ing. The objective lens provided in the optical head 19 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, for example, by a biaxial mechanism.

  A magnetic head 18 is disposed at a position facing the optical head 19 with the disk 90 interposed therebetween. The magnetic head 18 performs an operation of applying a magnetic field modulated by the recording data to the disk 90. Although not shown, a sled motor and a sled mechanism are provided to move the entire optical head 19 and the magnetic head 18 in the radial direction of the disk.

  In the media drive unit 2, 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 19 and the magnetic head 18 and the disk rotation driving system using the spindle motor 29.

  In the recording processing system, a portion that performs modulation of the first modulation method (EFM modulation / ACIRC encoding) when recording an audio track, and a second modulation method (RLL (1-7) PP modulation, RS when recording a data track) -LDC encoding) is provided.

  In the reproduction processing system, a part for performing demodulation (EFM demodulation / ACIRC decoding) with respect to the first modulation method during reproduction of the audio track, and a demodulation (partial response PR (1, 2, 2) with respect to the second modulation method during recording of the data track. 1) and a part for performing RLL (1-7) demodulation and RS-LDC decoding based on data detection using Viterbi decoding.

  Information (photocurrent obtained by detecting the laser reflected light by the photodetector) detected as reflected light by the laser irradiation of the optical head 19 on the disk 90 is supplied to the RF amplifier 21. The RF amplifier 21 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 (on the disc 90) as reproduction information. (ADIP information recorded by track wobbling) and the like are extracted.

  At the time of audio track reproduction, the reproduction RF signal obtained by the RF amplifier is processed by the EFM demodulator 24 and the ACIRC decoder 25. That is, the reproduced RF signal is binarized by the EFM demodulator 24 to be an EFM signal sequence, EFM demodulated, and further subjected to error correction and deinterleaving processing by the ACIRC decoder 25. That is, at this time, the state becomes ATRAC compressed data. At the time of audio track reproduction, the selector 26 is selected on the B contact side, and the demodulated ATRAC compressed data is output as reproduction data from the disk 90. The output reproduction data is supplied to the audio processing unit 10 via the memory transfer controller 3.

  On the other hand, at the time of data track reproduction, the reproduction RF signal obtained by the RF amplifier 21 is processed by the RLL (1-7) PP demodulation unit 22 and the RS-LDC decoder 23. That is, the reproduced RF signal is obtained as RLL (1-7) code string by the RLL (1-7) PP demodulator 22 by data detection using PR (1, 2, 1) and Viterbi decoding. The RLL (1-7) demodulation process is performed on the RLL (1-7) code string. Then, the RS-LDC decoder 23 performs error correction and deinterleave processing.

  At the time of data track reproduction, the selector 26 is selected on the A contact side, and the demodulated data is output as reproduction data from the disk 90. In this case, the demodulated data is supplied to the memory transfer controller 3 of FIG.

  The tracking error signal TE and the focus error signal FE output from the RF amplifier 21 are supplied to the servo circuit 27, and the groove information is supplied to the ADIP decoder 30.

  The ADIP decoder 30 extracts the wobble component by band-limiting the groove information with a bandpass filter, and then performs FM demodulation and biphase demodulation to extract the ADIP address. The extracted ADIP address, which is absolute address information of the disk 90, is supplied to the drive controller 31. The drive controller 31 executes a required control process based on the ADIP address. The groove information is supplied to the servo circuit 27 for spindle servo control.

  The servo circuit 27 generates a spindle error signal for CLV servo control, for example, based on an error signal obtained by integrating the phase error with the reproduction clock (PLL clock at the time of decoding) with respect to the groove information.

  The servo circuit 27 performs various servo controls based on the spindle error signal, the tracking error signal, the focus error signal supplied from the RF amplifier 21 as described above, or the track jump command, access command, etc. from the drive controller 31. Signals (tracking control signal, focus control signal, thread control signal, spindle control signal, etc.) are generated and output to the motor driver 28. 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 31 generates a required servo drive signal based on the servo control signal supplied from the servo circuit 27. The servo drive signal here includes a biaxial drive signal for driving the biaxial mechanism (two types of focus direction and tracking direction), a sled motor drive signal for driving the sled mechanism, and a spindle motor drive signal for driving the spindle motor 29. It becomes. With such a servo drive signal, focus control and tracking control for the disk 90 and CLV control for the spindle motor 29 are performed.

  When a recording operation is performed on the disk 90, high-density data from the memory transfer controller 3 or ATRAC compressed data generated by the audio processing unit 10 is supplied.

  At the time of audio track recording, the selector 16 is connected to the B contact, so that the ACIRC encoder 14 and the EFM modulator 15 function. In this case, the compressed data generated by the audio processing unit 10 and supplied from the memory transfer controller 3 is subjected to interleaving and error correction code addition by the ACIRC encoder 14 and then EFM modulation by the EFM modulation unit 15.

  The EFM modulation data is supplied to the magnetic head driver 17 via the selector 16, and the magnetic head 18 applies a magnetic field to the disk 90 based on the EFM modulation data, thereby recording an audio track.

  At the time of data track recording, the selector 16 is connected to the A contact, so that the RS-LDC encoder 12 and the RLL (1-7) PP modulation unit 13 function. In this case, the high-density data from the memory transfer controller 3 is subjected to interleaving and RS-LDC error correction code addition by the RS-LDC encoder 12, and then the RLL (1-7) PP modulation unit 13 performs RLL ( 1-7) Modulation is performed.

  Then, the recording data as the RLL (1-7) code string is supplied to the magnetic head driver 17 via the selector 16, and the magnetic head 18 applies a magnetic field based on the modulation data to the disk 90, thereby data tracks. Is recorded.

  The laser driver / APC 20 causes the laser diode to perform a laser emission operation during the above-described reproduction and recording, but also performs a so-called APC (Automatic Laser Power Control) operation. That is, although not shown, a detector for laser power monitoring is provided in the optical head 19, and the monitor signal is fed back to the laser driver / APC 20. The laser driver / APC 20 compares the current laser power obtained as the monitor signal with the set laser power and reflects the error in the laser drive signal, so that the laser power output from the laser diode is , It is controlled to stabilize at the set value. As the laser power, values as reproduction laser power and recording laser power are set in a register in the laser driver / APC 20 by the drive controller 31.

  Based on an instruction from the system controller 9, the drive controller 31 performs control so that the above operations (access, various servos, data writing, and data reading operations) are executed. In FIG. 12, the A part and the B part surrounded by the alternate long and short dash line can be configured as a one-chip circuit part, for example.

  By the way, when the disk 90 is set in advance so that the data track recording area DA and the audio track recording area AA are divided as shown in FIG. 3, the system controller 9 determines whether the data to be recorded and reproduced is an audio track. Depending on the data track, the drive controller 31 of the media drive unit 2 is instructed to access based on the area setting. When a dedicated disk whose entire area is the data track recording area DA as shown in FIG. 4 is loaded as the disk 90, the system controller 9 controls the recording of the audio track for the disk to be prohibited. I do. That is, control is performed so that the audio processing unit 10 does not function.

  Next, the configuration of the audio processing unit 10 will be described below. As shown in FIG. 13, the audio processing unit 10 includes an analog audio signal input unit 40 such as a line input circuit / microphone input circuit, an A / D converter 41, and a digital audio data input unit 42 as an input system. The output system includes a digital audio data output unit 43, a D / A converter 44, an analog audio signal output unit 45 such as a line output circuit / headphone output circuit, and an ATRAC compression encoder / decoder (hereinafter referred to as “ATRAC unit”). ) 46, and the ATRAC unit 46 is connected to the memory transfer controller 3.

  An audio track is recorded on the disk 90 when digital audio data (or an analog audio signal) is input to the audio processing unit 10. The ATRAC unit 46 performs ATRAC compression encoding on the data input from the analog audio signal input unit 40 and the data input via the A / D converter 41 or the data input from the digital audio data input unit 42, and sends the data to the memory transfer controller 3. Supply. The memory transfer controller 4 writes the compressed data supplied from the ATRAC unit 46 to the cluster buffer memory 4, reads the compressed data from the cluster buffer memory 4 at a predetermined timing (data unit corresponding to ADIP cluster), and transfers it to the media drive unit 2. To do.

  In the media drive unit 2, the transferred compressed data is modulated by the first modulation method and written on the disk 90 as an audio track.

  When an audio track is reproduced from the disk 90, the media drive unit 2 demodulates the reproduction data into an ATRAC compressed data state and transfers it to the audio processing unit 10. Data transferred from the media drive unit 2 is written into the cluster buffer memory 4 by the memory transfer controller 3. The memory transfer controller 3 reads data from the cluster buffer memory 4 at a predetermined timing and outputs it to the ATRAC unit 46. The ATRAC unit 46 performs ATRAC compression decoding on the input data to obtain linear PCM audio data, which is output from the digital audio data output unit 43 or converted into an analog audio signal by the D / A converter 44. Output from the output unit 45.

  On the other hand, when the user arbitrarily records and reproduces music or the like, it is preferable to provide an operation unit and a display unit as a user interface.

  Here, the structure of the memory transfer controller 4 will be described with reference to FIG. It is assumed that audio data encoded at different encoding rates is recorded on the disk 90 in a mixed manner. Also, as shown in FIG. 15, the audio data is configured for each audio block fixed at 16 kB. After 0020h of the audio block, audio data is configured in units called a plurality of sound frames (SF) for each predetermined data, and 0000h to 0010h and 3FE0h to 3FF0h (header) include various kinds of sound frames. Consists of information. As shown in FIG. 16, the disk 90 includes an area A in which the above-described audio block is recorded and an area B in which information (block information) related to the audio block is recorded. The block information is several bytes of information data representing the contents of the corresponding audio block, and includes information such as coding rate information and the number of sound frames. Even when the data size of the audio block is the same, the playback time differs depending on the coding rate. For example, when 10 blocks of data are read from the disk 90 and the data is encoded at a certain coding rate, the playback time is 20 seconds, and the data In the case of encoding at a coding rate, the playback time may be 40 seconds.

  The memory transfer controller 3 writes the audio block read from the disk 90 by the media drive unit 2 and block information corresponding to the audio block to the cluster buffer memory 4, and a predetermined amount of audio blocks are written to the cluster buffer memory 4. When the audio block is written to the buffer memory by the writing / reading unit 50 and the writing / reading unit 50 writes the audio block to the buffer memory, the reproduction time pt1 of the audio block is set based on the corresponding block information. When the audio block is read from the buffer memory by the writing / reading unit 50, the calculation unit 51 that calculates the reproduction time pt2 of the audio block is calculated based on the corresponding block information, and the calculation unit 51 calculates During playback The reproduction time pt3 of the audio block written in the cluster buffer memory 4 is calculated by using pt1 as the addition amount and the reproduction time pt2 as the subtraction amount. Based on the calculated reproduction time pt3, the write timing T1 by the writing / reading unit 50 is calculated. And a controller 52 for controlling the read timing T2. The controller 52 controls the writing / reading unit 50 so that the timing T1 and the timing T2 are not synchronized (same timing). Moreover, the calculation part 51 may be comprised with the program which performs the above calculations. In this case, the program is stored in a ROM (not shown), and the program is read from the ROM when the memory transfer controller 3 performs an operation.

  The controller 52 calculates the reproduction time pt3 written in the cluster buffer memory 4 from the reproduction time pt1 calculated by the calculation unit 51 and the reproduction time pt2, and when the reproduction time pt3 reaches a preset threshold value. The writing / reading unit 50 is controlled. The writing / reading unit 50 writes data for a predetermined time in the cluster buffer memory 4 under the control of the controller 52.

  Further, the controller 52 compares the calculated reproduction time pt3 written in the cluster buffer memory 4, not the free capacity (number of sectors) of the cluster buffer memory 4 as in the prior art, with a predetermined threshold, and according to the comparison result. Since the writing / reading unit is controlled, it is not necessary to set a high threshold value in order to match the data recorded on the disk 90 with the lowest coding rate, and an optimal threshold value is set. Can do.

  Therefore, as shown in FIG. 17, the recording / reproducing apparatus 1 according to the present invention does not start writing data even though sufficient data for the reproducible time remains. Since the threshold value of the cluster buffer memory 4 can be optimally set regardless of the coding rate of the data recorded on the disk 90, the number of data write operations by the writing unit can be reduced, and the power can be reduced. Consumption can be reduced.

  In addition, the recording / reproducing apparatus 1 includes an interface that can specify a threshold value of the cluster buffer memory 4 (a value indicating a timing at which data and information related to the data are written to the cluster buffer memory 4), and the user operates the interface. A configuration in which a threshold value can be arbitrarily designated may be used. In addition, the recording / reproducing apparatus 1 arbitrarily selects a mode that suppresses power consumption according to the level of the threshold (sets the threshold low) and a mode that does not skip sound even when continuous vibration is applied (set the threshold high). You can choose.

  The recording / reproducing apparatus 1 may be configured to display the reproduction time pt3 or the total reproduction time of the data written in the cluster buffer memory 4 on the display unit.

It is explanatory drawing of the disk used with the recording / reproducing apparatus which concerns on this invention. It is explanatory drawing of the 1st area structure of the disc used with the recording / reproducing apparatus which concerns on this invention. It is explanatory drawing of the 2nd area structure of the disc used with the recording / reproducing apparatus which concerns on this invention. It is explanatory drawing of the 3rd area structure of the disc used with the recording / reproducing apparatus which concerns on this invention. It is explanatory drawing of the management structure of the disk used with the recording / reproducing apparatus which concerns on this invention. It is explanatory drawing of the UTOC sector 0 of the disc used with the recording / reproducing apparatus based on this invention. It is explanatory drawing of the link form of the UTOC sector 0 of the disk used with the recording / reproducing apparatus based on this invention. It is explanatory drawing of the example of management by the UTOC of the disk used with the recording / reproducing apparatus which concerns on this invention. It is explanatory drawing of the cluster structure example of the disk used with the recording / reproducing apparatus which concerns on this invention. It is explanatory drawing of the FAT file system in the data track of the disc used with the recording / reproducing apparatus based on this invention. 1 is a block diagram of a recording / reproducing apparatus according to the present invention. It is a block diagram of the media drive part with which the recording / reproducing apparatus which concerns on this invention is equipped. It is a block diagram of the audio processing part with which the recording / reproducing apparatus which concerns on this invention is equipped. It is a block diagram of the memory transfer controller with which the audio processing part is equipped. It is a schematic diagram which shows the structure of audio data. It is a schematic diagram which shows the state by which the audio block and block information are recorded on the disc. It is a figure which shows the timing which writes the data and the information corresponding to the said data in a cluster buffer memory. It is a timing chart explaining operation | movement of a memory. It is a figure which shows the timing which writes data in memory. It is a figure which shows the timing which writes data in memory.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Recording / reproducing apparatus, 2 Media drive part, 3 Memory transfer controller, 4 Cluster buffer memory, 5 Auxiliary memory, 6,8 USB interface, 7 USB hub, 9 System controller, 10 Audio processing part, 40 Analog audio | voice signal input part, 41 A / D converter, 42 digital audio data input unit, 43 digital audio data output unit, 44 D / A converter, 45 analog audio signal output unit, 46 ATRAC compression encoder / decoder, 50 write / read unit, 51 Calculation unit, 52 controller

Claims (6)

Writing means for writing data and information related to the data to the memory;
Reading means for reading data and information related to the data from the memory when the data written to the memory by the writing means reaches a predetermined amount;
First writing means for calculating a reproduction time pt1 of the data based on information related to the data when writing the data into the memory by the writing means;
A second calculating unit that calculates a reproduction time pt2 of the data based on information about the data when the data is read from the memory by the reading unit;
The reproduction time pt3 of the data written in the memory is calculated using the reproduction time pt1 calculated by the first calculation means as an addition amount and the reproduction time pt2 calculated by the second calculation means as a subtraction amount. A third calculating means;
And a control means for controlling the write timing T1 by the writing means and the read timing T2 by the reading means based on the reproduction time pt3 calculated by the third calculating means,
The data writing / reading apparatus, wherein the control means controls the timing T1 and the timing T2 so as not to be synchronized. 2. A data writing / reading apparatus according to claim 1, further comprising decoding means for decoding data read by said reading means based on information relating to the data. First reading means for reading data and information related to the data from the recording medium;
Writing means for writing data read by the first reading means and information related to the data into a memory;
Second reading means for reading data and information related to the data from the memory when the data written to the memory by the writing means reaches a predetermined amount;
First writing means for calculating a reproduction time pt1 of the data based on information related to the data when writing the data into the memory by the writing means;
Second reading means for calculating a reproduction time pt2 of the data based on information about the data when the data is read from the memory by the second reading means;
A reproduction time pt3 of the data written in the memory is calculated using the reproduction time pt1 calculated by the first calculation means as an addition amount and the reproduction time pt2 calculated by the second calculation means as a subtraction amount. Means for calculating
A control means for controlling a write timing T1 by the writing means and a read timing T2 by the second reading means based on the reproduction time pt3 calculated by the third calculating means;
The reproducing apparatus according to claim 1, wherein the control means performs control so that the timing T1 and the timing T2 are not synchronized. 4. A reproducing apparatus according to claim 3, further comprising decoding means for decoding the data read by said second reading means based on information relating to the data. The first reading means reads data and information related to the data from a recording medium in which data having different encoding rates are recorded together,
4. The reproducing apparatus according to claim 3, wherein the information related to the data includes information on a coding rate of the corresponding data. Read data and information about the data from the recording medium,
When writing the read data and information related to the data into the memory, the reproduction time pt1 of the data to be written is calculated based on the information related to the data,
When reading data from the memory, the reproduction time pt2 of the data to be read is calculated based on the information about the data,
The reproduction time pt3 of the data written in the memory is calculated using the reproduction time pt1 as an addition amount and the reproduction time pt2 as a subtraction amount,
A reproduction method comprising writing data and information related to the data to the memory based on the reproduction time pt3, and reading the data and information related to the data from the memory.

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