JP3866169B2 - Recording / reproducing apparatus and data corruption detection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording / reproducing apparatus and a data corruption detection method.
[0002]
[Prior art]
With the popularization of music MDs (minidiscs) and the like, recording / reproducing apparatuses represented by MD recorders are becoming popular as one of popular audio devices. Such a recording / reproducing apparatus can record music data reproduced by a CD player or the like, music data received by an FM tuner or the like on an MD (recording MD), and reproduce it.
In addition, the MD includes an area for recording table of contents information (start / end addresses, etc.) for managing recorded music data (tracks) and input title information (disc titles, track titles, etc.) as UTOC A (User's Table Of Contents) area is provided.
Then, the recording / reproducing apparatus sequentially reproduces the music data recorded on the MD according to the table of contents information recorded in the UTOC area, or displays a title such as music data during reproduction according to the title information.
[0003]
Recently, a technology for recording a large amount (a large number) of music data in an MD or the like has been put into practical use by using a voice compression technology represented by ATRAC3 (Adaptive TRansform Acoustic Coding 3) or the like.
For example, in the MDLP (long recording mode) standard to which ATRAC3 is applied, music data for five music CDs can be recorded on one MD.
[0004]
As described above, when a large amount of music data can be recorded on the MD, even if each music data is simply managed only by the track title or the like, the user will eventually be confused. Therefore, a method of dividing each music data into groups is adopted so that a large amount of music data can be handled easily.
In general, a recording / reproducing apparatus adopting the MDLP standard has a group management function, and a user can divide and register each music data recorded in the MD into arbitrary groups.
For example, using such a group management function, the user registers only the music data of artist A in association with group 1 and registers only the music data of artist B in association with group 2. When the user designates group 2 and instructs group reproduction, the recording / reproducing apparatus sequentially reproduces only the music data of artist B registered in the group.
That is, the user can listen to only the music data of artist B in order from a large amount of music data.
[0005]
[Problems to be solved by the invention]
The recording / reproducing apparatus having the group management function described above defines the association between groups and music data by group information. This group information is managed, for example, in title information in the UTOC area.
[0006]
However, the title information in the UTOC area can be normally edited even by an old recording / reproducing apparatus that does not have a group management function. For this reason, if the MD in which the group information is recorded is inserted into an old-type recording / reproducing apparatus and the title information is edited there, the group information is partially deleted or replaced with another character or the like. There is a case. That is, the group information is destroyed (data is damaged), and the data is not consistent.
[0007]
Even if the MD in which the group information is destroyed (data corrupted) is inserted into the recording / reproducing apparatus having the group management function and the reproduction specifying the group is instructed, the group information cannot be acquired. Appropriate group playback is not performed. In other words, normal group management cannot be performed.
When such a situation is encountered, the user may suspect a failure of the recording / reproducing apparatus without knowing why the group management cannot be performed normally.
Also, even if a user registers a new group without noticing the situation where group management cannot be performed normally, the group information has already been destroyed, so the added information is simply added as a title. There is no change to the situation where group management cannot be performed normally, so the group registration operation itself is wasted.
[0008]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a recording / reproducing apparatus and a data corruption detection method capable of appropriately detecting data corruption of group information recorded on a disc.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, a recording / reproducing apparatus according to the first aspect of the present invention provides:
  Multiple used togetherBy group informationMusic dataGroup managedHaveA recording / reproducing apparatus for recording / reproducing the predetermined recording medium,
  The plurality ofGroup information from recording mediaRespectivelyA group information reading means for reading;
  Read by the group information reading meansThe plurality ofGroup informationRespectivelyAnalyze and according to the analysis results,eachGroup informationunitIn,AriseobtainData corruptionRespectivelyData corruption detection means to detect;
  A group management unit that performs group management using other normal group information when data corruption is detected only in any of the group information by the data corruption detection unit;
  By the data corruption detection meansFor all group informationInformation output means for outputting information indicating the occurrence of data corruption in the group information when data corruption is detected;
  It is characterized by providing.
[0010]
  The data corruption detection means iseachAccording to the relationship between the group start character string and the group end character string in the group information,eachGroup informationunitIn,AriseobtainData corruption may be detected.
[0011]
  The data corruption detection means isFor each group information unit,At least consistency within the group, consistency among all groups, and consistency of track numbers for managing music dataRespectivelyAnalyze and if there is any consistency problem,ConcernedData corruption that occurs in the group information may be detected.
[0012]
  The recording / reproducing apparatus includes: instruction information acquisition means for acquiring instruction information for instructing deletion of group information input in accordance with information output by the information output means;
  Data corruption occurred according to the instruction information acquired by the instruction information acquisition meansAll ofAnd group information erasing means for substantially erasing the group information.
[0013]
  In order to achieve the above object, a recording / reproducing apparatus according to the second aspect of the present invention provides:
  1st and 2nd used togetherIn title informationCorresponding first and secondMusic data is group-managed by group informationHaveA recording / reproducing apparatus for recording / reproducing the predetermined recording medium,
  The first and secondTitle information from the recording mediumRespectivelyTitle information reading means for reading;
  Read by the title information reading meanseachIncluded in title informationThe first and secondGroup informationRespectivelyGroup information analysis means to analyze,
  According to the analysis result of the group information analysis means,The first and secondOccurs in group informationobtainData corruptionRespectivelyData corruption detection means to detect;
  A group management unit that performs group management using the other normal group information when data corruption is detected only in one of the group information by the data corruption detection unit;
  By the data corruption detection meansBoth group informationInformation output means for outputting information indicating the occurrence of data corruption in the group information when data corruption is detected;
  It is characterized by providing.
[0014]
  The group information analyzing means includesFor each group information unit,At least the consistency between the group start character string and the group end character string in the group information, the consistency within the group, the consistency among all groups, and the consistency of the track number for managing the music dataRespectivelyParse and
  The data corruption detection means is the group information analysis means.Group information unitIf there is a problem with any of the analyzed consistency,ConcernedData corruption that occurs in the group information may be detected.
[0015]
  The recording / reproducing apparatus includes: instruction information acquisition means for acquiring instruction information for instructing deletion of group information input in accordance with information output by the information output means;
  In accordance with the instruction information acquired by the instruction information acquisition means, data corruption has occurred from the title informationThe first and secondAnd group information erasing means for substantially erasing the group information.
[0016]
  In order to achieve the above object, a data corruption detection method according to the third aspect of the present invention provides:
  Music dataMultiple used togetherThe group is managed by group information.HaveA data corruption detection method in a recording / reproducing apparatus for recording / reproducing a predetermined recording medium,
  The plurality ofGroup information from recording mediaRespectivelyA group information reading step to be read; and
  Read in the group information reading stepThe plurality ofGroup informationRespectivelyAnalyze and according to the analysis results,eachGroup informationunitIn,AriseobtainData corruptionRespectivelyA data corruption detection step to detect;
  A group management step of performing group management using other normal group information when data corruption is detected only in any group information in the data corruption detection step;
  In the data corruption detection stepFor all group informationAn information display step of displaying information indicating occurrence of data corruption in the group information on a predetermined display unit when data corruption is detected;
  It is characterized by providing.
[0017]
  The data corruption detection step includes:eachAccording to the relationship between the group start character string and the group end character string in the group information,eachGroup informationunitIn,AriseobtainData corruption may be detected.
[0018]
  The data corruption detection step includes:For each group information unit,At least consistency within the group, consistency among all groups, and consistency of track numbers for managing music dataRespectivelyAnalyze and if there is any consistency problem,ConcernedData corruption that occurs in the group information may be detected.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
A recording / reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
[0020]
FIG. 1 is a block diagram showing an example of the configuration of a recording / reproducing apparatus applied to the embodiment of the present invention. As shown, the recording / reproducing apparatus includes a digital signal processing circuit 1, a head driver 2, a recording head 3, a spindle motor 4, an optical pickup 5, a feed motor 6, an RF amplifier 7, and a buffer memory. 8, a system controller 9, an operation unit 10, and a display panel 11.
As an example, the recording / reproducing apparatus is an audio device that complies with the MDLP (long-time recording mode) standard, and can record a large amount of music data on a disk d (MD; mini-disc). Moreover, the recording / reproducing apparatus has a group management function that can divide each music data into arbitrary groups.
[0021]
Incidentally, the disk d is provided with a program area, a UTOC (User Table Of Contents) area, and the like.
The program area is an area for recording music data. The UTOC area is an area in which various information for managing music data recorded in the program area is stored.
For example, sector 0, sector 1 and the like are used in the UTOC area, the music table of contents information (start address, end address, etc.) is managed in sector 0, and title information is stored in sector 1 (Disc title, track title, etc.) are managed. In the title information, group information for group management of music data can be stored.
[0022]
Specifically, the sector 0 and the sector 1 in the UTOC area have a structure as shown in FIGS. In the sector 0 shown in FIG. 2, information such as a start address (Start address), an end address (End address), and a track mode (Track mode) is managed for each music data (track).
Also, in the sector 1 shown in FIG. 3, information such as a disc title (Disc name) and a track title (Disc name or Track name) is managed for each music data (track).
[0023]
When music data is group-managed, group information is managed in this sector 1. For example, the group information consists of a character string as shown in FIG.
In the group information shown in FIG. 4, the disc title is “The Best”, and the group “Album1” is associated with the music data of track numbers 1 to 7. Similarly, the group “Album2” is associated with the music data of the track numbers 8 to 10, the group “Album3” is the track numbers 13 to 15, and the group “Album4” is associated with the music data of the track numbers 16 to 20, respectively. .
Such group information is stored in a disc title (Disc name) shown in FIG. 3 (8 bytes from 76 × 4 in the figure, that is, 304 bytes to 311 bytes, etc.).
[0024]
Returning to FIG. 1, the digital signal processing circuit 1 includes an ADIP (ADdress In Pre-groove) decoder, an EFM (Eight to Fourteen Modulation) decoder, a shock proof memory controller, an ATRAC (Adaptive TRansform Acoustic Coding) encoder / decoder, and Operates as a servo controller.
Specifically, the digital signal processing circuit 1 is controlled by the system controller 9, and controls the spindle motor 4, the optical pickup 5, the feed motor 6, the head driver 2, and the like.
For example, when recording music data on the disk d, the digital signal processing circuit 1 temporarily stores the music data supplied from the outside in the buffer memory 8 while the music data sequentially read from the buffer memory 8 is stored in the head driver. 2 etc. are controlled and recorded on the disk d (program area).
Further, the digital signal processing circuit 1 controls the head driver 2 and the like, and writes table of contents information and title information (group information) in the UTOC area of the disk d.
[0025]
The head driver 2 controls the recording head 3 to write music data or the like on the disk d.
The spindle motor 4 rotationally drives a turntable (not shown) on which the disk d is mounted.
The optical pickup 5 irradiates a recording surface of the disk d with laser light having a predetermined wavelength when reproducing music data, receives the reflected light, and converts it into an electrical signal. Then, the converted electric signal is supplied to the RF amplifier 7.
Further, the optical pickup 5 irradiates the recording surface of the disk d with laser light when recording music data, and heats it until it reaches the Curie point or higher.
[0026]
The feed motor 6 is controlled by the digital signal processing circuit 1 and moves the optical pickup 5 to a predetermined position on the disk d.
The RF amplifier 7 generates an RF signal, a focus error signal, a tracking error signal, and the like from the electrical signal supplied from the optical pickup 5. The RF amplifier 7 supplies the generated RF signal or the like to the digital signal processing circuit 1 or the like.
Further, the RF amplifier 7 extracts groove information (absolute position information = ADIP recorded as a pre-groove on the disk d) and the like.
[0027]
The buffer memory 8 temporarily stores a predetermined amount of music data when recording or reproducing the music data. The music data stored in the buffer memory 8 is sequentially read out by the digital signal processing circuit 1.
[0028]
The system controller 9 is composed of, for example, a one-chip microcomputer including an internal memory, and controls the digital signal processing circuit 1 and the like.
Specifically, the system controller 9 instructs the digital signal processing circuit 1 to search for the address of the disk d, to control the optical pickup 5, and to start ATRAC decoding. Also, ADIP address information, EFM address information, ATRAC data write pointer, read pointer, and the like in the buffer memory 8 are acquired.
[0029]
In addition, the system controller 9 includes a group information management unit 9a. The group information management unit 9a manages the group information as shown in FIG. 4 stored in the sector 1 of the UTOC area.
Specifically, the group information management unit 9a analyzes the group information stored in the sector 1 and detects the presence or absence of data corruption. When it is detected that there is data corruption, the group information management unit 9a displays a message on the display panel 11 informing that the group information is broken. When receiving an instruction to discard the group information from the operation unit 10, the group information management unit 9a deletes the group information in which data is damaged.
[0030]
The operation unit 10 includes a plurality of key switch groups, for example, and supplies instruction information to the system controller 9 in accordance with a user operation (pressing or the like). For example, the operation unit 10 inputs instruction information that instructs to discard group information in which data corruption has occurred.
[0031]
The display panel 11 is composed of a liquid crystal display panel or the like, and displays characters, figures, and the like indicating the operation status of the recording / reproducing apparatus in accordance with display data supplied from the system controller 9. For example, the display panel 11 displays a message notifying that the group information is broken.
[0032]
The operation of the recording / reproducing apparatus according to the embodiment of the present invention will be described below with reference to FIG.
FIG. 5 is a flowchart for explaining the loading process executed by the system controller 9. This loading process is executed in parallel with a predetermined process (for example, a process of waiting for a user's instruction input via the operation unit 10) when the disk d is not inserted into the recording / reproducing apparatus.
[0033]
First, the system controller 9 waits for execution of subsequent processing until it detects the insertion of the disk d (step S11). That is, it waits until the user inserts the disk d from a predetermined insertion port provided in the recording / reproducing apparatus and transports it to a predetermined mounting position.
[0034]
When the system controller 9 detects the insertion of the disk d, the system controller 9 reads UTOC information and the like from the disk d (step S12). That is, the system controller 9 controls the digital signal processing circuit 1 and tries to read out necessary information from the TOC area or UTOC area of the disk d. When the disk d is a recording MD, the system controller 9 reads out the table of contents information of the sector 0 as shown in FIG. 2 and the title information of the sector 1 as shown in FIG. 3 from the UTOC area. . The read information is stored in the internal memory of the system controller 9.
[0035]
The system controller 9 (group information management unit 9a) performs group information analysis processing (step S13). That is, the group information management unit 9a analyzes the group information that can be managed by the title information of the sector 1 shown in FIG. 3, and determines (detects) the presence of the group information and the presence or absence of data corruption in the group information. Details of the group information analysis process will be described later.
[0036]
The system controller 9 determines whether or not there is data corruption by the group information analysis process (step S14). That is, the group information management unit 9a determines whether group information exists in the title information and whether data corruption has been detected in the group information.
[0037]
If the system controller 9 determines that there is no data corruption (or no group information exists), the system controller 9 ends the loading process. After that, the system controller 9 displays a disc title or the like on the display panel 11 or waits for input of instruction information from the operation unit 10.
[0038]
On the other hand, when it is determined that there is data corruption, the system controller 9 (group information management unit 9a) performs group information discarding processing (step S15). That is, the group information management unit 9a notifies that the group information has data corruption, and erases the group information in which data corruption has occurred in accordance with a user instruction. Details of the group information discarding process will be described later.
When the group information discarding process is finished, the system controller 9 finishes the loading process.
[0039]
Next, the group information analysis process executed in step S13 of the loading process described above will be described with reference to the flowchart of FIG. This group information analysis process is executed by the group information management unit 9a.
[0040]
First, the group information management unit 9a sets an initial value 0 to a variable N used as a group NG counter, and sets an initial value 0 to a variable K used as a group detection counter (step S21).
[0041]
The group information management unit 9a searches for a character string from the disc title of the title information in order to search for group information (step S22). That is, the character string search is started from the disc title (Disc name) in the title information shown in FIG.
[0042]
The group information management unit 9a determines whether or not the group head character string has been detected by the search (step S23). That is, it is determined whether or not a character string arranged in the format of “TNO-TNO;” such as “1-7;” and “8-10;” as shown in FIG. 4 has been detected. Note that TNO is a track number and represents a numeric character string from 1 to 255 as a value.
[0043]
The group information management unit 9a determines whether the group end character string has been detected without detecting the group start character string (step S24). That is, it is determined whether or not the character string “//” as shown in FIG. 4 has been detected before the group head character string.
The group information may include a disc title in a format such as “0; The Best //” shown in FIG. 4. Therefore, the format of “0; character string //” is also considered. And
[0044]
When the group information management unit 9a determines that the group head character string has not been detected and the group end character string has not been detected, the group information management unit 9a advances the processing to step S28 described later.
On the other hand, when it is determined that the group end character string has been detected without detecting the group head character string, the group information management unit 9a adds 1 to the variable N (step S25). That is, since data corruption has occurred in the group information, 1 is added to the variable N serving as the group NG counter. And the group information management part 9a advances a process to step S28.
[0045]
If it is determined in step S23 that the group head character string has been detected, the group information management unit 9a determines whether the group end character string has been detected (step S26). That is, it is determined whether or not the group leading character string has been detected, and then the group end character string has been detected.
[0046]
When the group information management unit 9a determines that the group end character string has not been detected even though the group start character string has been detected, the group information management unit 9a adds 1 to the variable N (step S25), and then proceeds to step S28. Proceed with the process.
[0047]
On the other hand, when it is determined that the group head character string can be detected and then the group end character string can be detected, the group information management unit 9a adds 1 to the variable K (step S27). That is, since group information (valid group) exists in the title information, 1 is added to the variable K serving as a group detection counter.
[0048]
The group information management unit 9a determines whether or not the title end has been detected (step S28). That is, it is determined whether or not “NULL” (NULL value) indicating the end of the disc title (a series of disc titles) has been reached.
If the group information management unit 9a determines that the end of the title has not been detected, the group information management unit 9a returns the process to step S22, and repeatedly executes the processes of steps S22 to S28 described above.
[0049]
On the other hand, if it is determined that the end of the title has been detected, the group information management unit 9a determines whether or not the variable N remains at the initial value 0 (step S29). That is, it is determined whether or not the relationship between the group head character string and the group end character string is inconsistent (or these character strings are not included).
[0050]
If the group information management unit 9a determines that the variable N is not 0, the group information management unit 9a advances the processing to step S39 described later.
On the other hand, when it is determined that the variable N is 0, the group information management unit 9a determines whether or not the variable K remains at the initial value 0 (step S30). That is, it is determined whether or not the information defining the group is not included at all.
[0051]
When determining that the variable K is 0, the group information management unit 9a determines that group information does not exist in the title information (disc title) (step S31). Then, the group information management unit 9a finishes the group information analysis process and returns the process to the loading process of FIG.
[0052]
If it is determined in step S30 that the variable K is not 0 (1 or greater), the group information management unit 9a checks the consistency of the group information in each group (step S32). . For example, the consistency is checked such that there is no reversal of the TNO value in the “TNO-TNO;” format, or that it ends with “//”.
Then, the group information management unit 9a determines whether or not there is a problem with such consistency (step S33).
[0053]
When the group information management unit 9a determines that there is a problem in consistency within each group, the group information management unit 9a advances the processing to step S39 described later.
On the other hand, when it is determined that there is no problem in consistency, the group information management unit 9a checks consistency among all groups (step S34). For example, consistency is checked such that the TNO values are in ascending order between groups.
And it is discriminate | determined whether there was no problem in consistency (step S35).
[0054]
When the group information management unit 9a determines that there is a problem in the consistency among all the groups, the group information management unit 9a advances the process to step S39 described later.
On the other hand, when it is determined that there is no problem in consistency, the group information management unit 9a checks the consistency of the track number (TNO) (step S36). For example, consistency is checked such that the TNO values of all the groups do not exceed 255 (the maximum value of TNO).
And it is discriminate | determined whether there was no problem in consistency (step S37).
[0055]
If the group information management unit 9a determines that there is no problem in the consistency of the track numbers, it determines that the group information exists in the title information and that no data is damaged (step S38), and the group information analysis Finish the process.
[0056]
On the other hand, if it is determined that there is a problem in consistency, the group information management unit 9a determines that the group information exists in the title information and that data is damaged (step S39), and the group information analysis is performed. Finish the process.
[0057]
Next, the group information discarding process executed in step S15 of the loading process shown in FIG. 5 will be described with reference to the flowchart of FIG. This group information discarding process is executed by the group information management unit 9a.
[0058]
First, the group information management unit 9a displays a message for notifying data corruption and a message for confirming the destruction of the group information on the display panel 11 (step S41). For example, a message such as “GROUP information is broken, do you want to discard the information?” Is displayed on the display panel 11.
[0059]
The group information management unit 9a determines whether or not the destruction of the group information has been confirmed (step S42). That is, it is determined whether or not the instruction information for instructing the destruction of information is input via the operation unit 10.
[0060]
If the group information management unit 9a determines that the destruction of the group information has not been confirmed, the group information management unit 9a finishes the group information discarding process and returns to the loading process of FIG.
[0061]
On the other hand, when it is determined that the destruction of the group information has been confirmed, the group information management unit 9a erases the disc title and the like from the sector 1 in the UTOC area (step S43).
For example, 0 is written in the disc title (Disc name) shown in FIG. 3 (8 bytes from 76 × 4 in the figure, ie, 304 bytes to 311 bytes).
At that time, if a subsequent slot (other disc title or track title) is set after the first “Link-P” (311 bytes) of the disc title (that is, other than 0), the subsequent slot is not set. Combine to use slot.
When the disc title or the like is deleted, the group information management unit 9a finishes the group information discarding process.
[0062]
Thus, it is determined whether or not the group information is managed in the title information (disc title) when loading the disc d by the above-described loading processing, group information analysis processing, and group information discarding processing. When group information is managed, it is determined (detected) whether there is data corruption.
In addition, if group information exists and data corruption occurs, the user can be notified of this, and with the consent of the user, the group information in which data corruption has occurred is deleted. I can do it.
[0063]
As a result, it is possible to appropriately detect data corruption in the group information recorded on the disk d.
[0064]
In the above-described embodiment, a case has been described in which the group information is deleted after it is confirmed (instructed) by the user in the group information discarding process shown in FIG. However, the group information may be automatically deleted without waiting for an instruction from the user.
[0065]
In the above embodiment, the case where the loading process shown in FIG. 5 is performed up to the group information discarding process shown in FIG. 7 has been described. However, the timing for discarding the group information is arbitrary.
For example, group information may be discarded when a new group registration is performed. The operation when the group information is discarded at the time of group registration will be briefly described below with reference to FIG.
[0066]
FIG. 8 is a flowchart for explaining group registration processing executed by the system controller 9. It is assumed that the group information analysis process shown in FIG. 6 has already been performed in the loading process when the disk d is inserted.
[0067]
First, the system controller 9 waits for subsequent processing until a group registration instruction is given (step S51). That is, it waits until the operation unit 10 is operated by the user and instruction information for instructing group registration is input.
[0068]
When group registration is instructed, the system controller 9 determines whether data corruption has occurred in the group information (step S52). That is, it is determined whether or not it is determined that group information exists and data corruption has occurred by the group information analysis processing shown in FIG.
If the system controller 9 determines that no data is damaged (or no group information exists), the system controller 9 advances the process to step S54 described later.
[0069]
On the other hand, when it is determined that data corruption has occurred in the group information, the system controller 9 (group information management unit 9a) executes a group information discarding process (step S53). That is, the group information management unit 9a executes a group information discarding process as shown in FIG.
[0070]
The system controller 9 generates (updates) group information in accordance with an instruction from the operation unit 10 (step S54). That is, group information as shown in FIG. 4 is generated or added to the disc title (Disc name) shown in FIG.
[0071]
Even in such a group registration process, if group information exists and data corruption has occurred, it is possible to notify the user to that effect, and with the consent of the user, data corruption will occur. Delete the generated group information. Then, the user can register a new group and reflect the group information effectively.
[0072]
In the above embodiment, the case where title information and group information are managed in the sector 1 in the UTOC area as shown in FIG. 3 has been described. However, the present invention can also be applied as appropriate when title information and group information are managed in the sector 4 in the UTOC area.
Note that in the sector 4 in the UTOC area, title information in Chinese characters (shift JIS or the like) is managed.
Also, when sector 1 and sector 4 in the UTOC area are used in combination, the above-described group information analysis processing is performed on both title information (disc title), and data corruption occurs in both group information. The group information discarding process described above may be executed for each of the generated users.
Further, when data corruption occurs in one group information in the sector 1 and sector 4 in the UTOC area, the normal group information is used, and the above-described group information discarding process is not performed. Good.
[0073]
In the above embodiment, in order to describe the recording / reproducing apparatus compliant with the MDLP standard, the case where the group information analysis or the like is performed on the disc d made of MD has been described. It is arbitrary without being limited to.
For example, music data, group information, etc. may be recorded on a recording medium such as MO (Magneto-Optical disk), DVD-RAM (Digital Versatile Disk-RAM), etc., smart media (registered trademark), memory, etc. Music data, group information, or the like may be recorded on a recording medium such as a stick (registered trademark).
Furthermore, the data to be managed by the group is not limited to music data, but may be video data or the like.
[0074]
【The invention's effect】
As described above, according to the present invention, it is possible to appropriately detect data corruption of group information recorded on a disc.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an example of a configuration of a recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic diagram for explaining the structure of a UTOC area (sector 0) in a disc.
FIG. 3 is a schematic diagram for explaining the structure of a UTOC area (sector 1) in a disc.
FIG. 4 is a schematic diagram showing an example of specific contents of group information.
FIG. 5 is a flowchart for explaining loading processing according to the embodiment of the present invention;
FIG. 6 is a flowchart for explaining group information analysis processing according to the embodiment of the present invention;
FIG. 7 is a flowchart for explaining group information discarding processing according to the embodiment of the present invention;
FIG. 8 is a flowchart for explaining group registration processing according to the embodiment of the present invention;
[Explanation of symbols]
1 Digital signal processing circuit
2 Head driver
3 Recording head
4 Spindle motor
5 Optical pickup
6 Feed motor
7 RF amplifier
8 Buffer memory
9 System controller
9a Group Information Management Department
10 Operation part
11 Display panel

Claims (10)

Music data a predetermined recording medium Ru Tei is a group managed by a plurality of group information to be used in combination, a recording and reproducing apparatus for recording and reproducing,
Group information reading means for reading each of the plurality of group information from a recording medium;
Analyzing each of said plurality of group information said group information reading means has read, according to the analysis result, the group information units, and the data corruption detection means for detecting that can occur data corruption, respectively,
A group management unit that performs group management using other normal group information when data corruption is detected only in any of the group information by the data corruption detection unit;
Information output means for outputting information indicating occurrence of data corruption in the group information when data corruption is detected in all group information by the data corruption detection means;
A recording / reproducing apparatus comprising: The data corruption detection means, according to the relationship between the group head character string and group-terminated string in each group information, to each group information unit, to detect data corruption that may occur,
The recording / reproducing apparatus according to claim 1. The data corruption detection means, each group information units, at least, consistent within a group, consistency across all groups, and analyzes the consistency of the track number of managing music data, respectively, either If there is a problem in the consistency, to detect the resulting data corruption to the group information,
The recording / reproducing apparatus according to claim 1. Instruction information acquisition means for acquiring instruction information for instructing erasure of group information input according to the information output by the information output means;
Further comprising group information erasure means for substantially erasing all group information in which data corruption has occurred in accordance with the instruction information acquired by the instruction information acquisition means.
The recording / reproducing apparatus according to claim 1, 2 or 3. The first and second first and second musical data by the group information is group management predetermined recording medium Ru Tei corresponding to the title information to be used in combination, a recording and reproducing apparatus for recording and reproducing,
And title information reading means for reading each of said first and second title information from the recording medium,
Group information analysis means for analyzing each of the first and second group information included in each title information read by the title information reading means;
According to the analysis results of the group information analysis unit, and data corruption detection means for detecting the resulting capable data corruption to the first and second group information, respectively,
A group management unit that performs group management using the other normal group information when data corruption is detected only in one of the group information by the data corruption detection unit;
Information output means for outputting information indicating occurrence of data corruption in the group information when data corruption is detected in both group information by the data corruption detection means;
A recording / reproducing apparatus comprising: The group information analysis means includes, for each group information unit, at least the consistency between the group head character string and the group end character string in the group information, consistency within the group, consistency between all groups, and music. consistency of the track number for managing data were analyzed respectively,
The data corruption detection means detects data corruption that has occurred in the group information when there is a problem with any consistency analyzed by the group information analysis means in units of group information.
The recording / reproducing apparatus according to claim 5. Instruction information acquisition means for acquiring instruction information for instructing erasure of group information input according to the information output by the information output means;
Group information erasing means for substantially erasing the first and second group information in which data corruption has occurred from the title information in accordance with the instruction information acquired by the instruction information acquiring means;
The recording / reproducing apparatus according to claim 5 or 6, Music data, a predetermined recording medium Ru Tei is a group managed by a plurality of group information to be used in combination, a data corruption detection method in a recording and reproducing apparatus for recording and reproducing,
A group information reading step of reading each of the plurality of group information from a recording medium;
Analyzing each of said plurality of group information read by the group information reading step, according to the analysis result, the group information units, and the data corruption detection step of detecting that can occur data corruption, respectively,
A group management step of performing group management using other normal group information when data corruption is detected only in any group information in the data corruption detection step;
When data corruption is detected in all group information in the data corruption detection step, an information display step for displaying information indicating the occurrence of data corruption in the group information on a predetermined display unit;
A data corruption detection method comprising: The data corruption detection step, according to the relationship between the group head character string and group-terminated string in each group information, to each group information unit, to detect data corruption that may occur,
The data corruption detection method according to claim 8, wherein: The data corruption detection step, each group information units, at least, consistent within a group, consistency across all groups, and analyzes the consistency of the track number of managing music data, respectively, either If there is a problem in the consistency, to detect the resulting data corruption to the group information,
The data corruption detection method according to claim 8, wherein:

Images