JP4265530B2 - Disc playback apparatus, disc playback method, computer program, and computer program - Google Patents

Description

  The present invention relates to a disk playback apparatus and disk playback method for playing back information recorded on a disk type recording medium, and a computer program, and more particularly to a portable recording medium such as an optical disk such as a CD or a DVD. The present invention relates to a disk playback apparatus, a disk playback method, and a computer program for performing data playback processing.

  More particularly, the present invention relates to a disk playback apparatus, a disk playback method, and a computer program for performing data playback processing according to the state of deterioration of a loaded recording medium, and in particular, to a user for the progress of deterioration of a recording medium. The present invention relates to a disk playback apparatus, a disk playback method, and a computer program that can alleviate anxiety.

  With the recent technological innovation, various types of computer systems have been developed and marketed. These computer systems generally include an external storage system for storing information and installing operation programs.

  A magnetic recording type hard disk storage device (Hard Disk Drive) is a typical storage device. Several magnetic media as recording media are accommodated in the drive unit and rotated at high speed by a spindle motor. The medium is coated with a magnetic material plated with nickel or phosphorus. Then, by scanning the magnetic head in the radial direction on the surface of the rotating medium, magnetization corresponding to data can be generated on the medium to perform writing or data reading.

  Hard disks are already widespread. For example, as a standard external storage device for a personal computer, various software such as an operating system (OS) and applications necessary for starting the computer can be installed, and files created and edited can be saved A hard disk is used to do this.

  In addition, there are operation programs for installing on a hard disk and external storage devices of a type for reproducing information by detachably loading a removable recording disk in order to move data contents between systems. Conventionally, portable media such as flexible disks have been the mainstream, but recently, coupled with the expansion of programs and data contents, large-capacity disk-type recording media such as CDs and DVDs and their Disc playback devices are widely used.

  For example, a CD is a recording medium that can reproduce information based on an RF signal obtained by receiving reflected light with respect to light irradiated onto a recording surface. Depending on the combination of a reflective layer and a recording layer dye, There are variations (see, for example, Non-Patent Document 1).

  In addition to a read-only CD (press CD) in which pits corresponding to recorded information are formed in advance by the manufacturer like CD-ROM, like CD-R, CD-RW, DVD-R, DVD-RW, Disks on which information can be written by end users and corresponding drives have become widespread. Recently, there is an increasing number of occasions where optical disks such as CDs and DVDs are used as storage media for digital cameras and camcorders, and the necessity is increasing.

  By the way, this type of optical disk is generally considered to be a medium having a lifetime of several tens of years. However, in reality, the lifetime is large due to various factors such as the type of media, recording quality, and storage state. Change.

  In the analog era, the recorded media gradually deteriorated, so the user can easily know the storage status, and basically it can be played even in a very bad storage status. Is possible. That is, the deterioration of the medium is a continuous process, and the medium does not suddenly reach the end of its life one day.

  On the other hand, in a digitalized recording medium, the process of deterioration is discrete and discontinuous, and the media suddenly reaches the end of its life one day, and it is often impossible to read data unpredictably. . Since it is difficult for a general user to know the state of deterioration of recorded media, this results in anxiety to the user. Of course, it is possible to take a measure such as keeping a backup, but it is still uneasy because we do not know when the media can be played back.

  In the future, in order to leave records and memorials, the need to leave records on digital cameras and digital videos will increase, and it is expected that the importance will also increase for the preservation of recorded media. The sense of anxiety given to users becomes a major barrier in the spread of products.

  For example, an information recording medium that can warn a user to back up recorded information before the recorded information is damaged has been proposed (see, for example, Patent Document 1). This information recording medium is provided with a life judgment area having a shorter life than the recording area, and the life judgment area reaches the life before the recording area that has deteriorated due to long-term storage reaches the life. It is possible to know the progress of deterioration. However, in the case of a conventional recording format disc that does not have a life determination area, the life or the degree of deterioration cannot be detected.

  An information recording / reproducing apparatus having a self-diagnosis information recording mechanism without increasing memory capacity and without losing important error information has been proposed (for example, see Patent Document 2). . This information recording / reproducing apparatus detects malfunctions of the apparatus main body and the quality of the signal recorded on the recording medium, stores the error information in the memory, and stores subsequent error information when a fatal error occurs. It is forbidden. However, there is no mention of how to eliminate the user's anxiety about the progress of the deterioration of the recording medium.

Japanese Patent Laid-Open No. 11-203728 JP-A-5-298835 Yasuhiro Mori “CD-R / DVD-R Master” (Sansai Mook, pages 90-92, June 1, 2002)

  An object of the present invention is to provide an excellent disc reproducing apparatus, disc reproducing method, and computer program capable of suitably performing data reproduction processing from a portable recording medium.

  It is a further object of the present invention to provide an excellent disc playback apparatus, disc playback method, and computer program capable of performing data playback processing according to the state of deterioration of a loaded recording medium.

  A further object of the present invention is to provide an excellent disc reproducing apparatus, disc reproducing method, and computer program capable of eliminating the user's anxiety about the progress of deterioration of the recording medium.

The present invention has been made in consideration of the above problems, and a first aspect of the present invention is a disc playback apparatus for playing back data from a disc-type recording medium,
Disk deterioration determination means for determining the deterioration state of the disk;
User notification means for notifying a user when it is determined by the disk deterioration determination means that the deterioration of the disk has progressed over a predetermined amount;
A disc playback apparatus comprising:

  Here, the disk deterioration determining means includes, for example, an error rate measuring means for measuring an error rate when data is reproduced from the disk, and a threshold comparing means for determining the deterioration of the disk by determining the error rate measured value as a threshold. ing.

  In addition, the user notification means can prompt the user to back up a disk whose deterioration has been determined.

The second aspect of the present invention is a disk reproducing apparatus for reproducing data from a disk-type recording medium,
An error rate measuring means for measuring an error rate when reproducing data from a disc;
Threshold comparison means for determining the deterioration of the disk by determining the error rate measurement value as a threshold;
A disc playback apparatus comprising:

  Recently, there are increasing opportunities for optical disks such as CDs and DVDs to be used as storage media for digital cameras and camcorders. However, in a digital recording medium, the degradation process is discrete and discontinuous, and there is a problem that the media suddenly reaches the end of its life one day and data cannot be read unpredictably. . Since it is difficult for a general user to know the state of deterioration of recorded media, this results in anxiety to the user.

On the other hand, in the disk reproducing apparatus according to the present invention, the state of deterioration of the disk is observed based on the count value of the error rate, and the user can be notified when the state of deterioration has progressed to some extent. As a notification method to the user, there is a backup instruction for the recorded contents of the disc. For the user, it is possible to suitably know the timing at which backup is to be performed, so that loss of valuable data stored can be prevented and the sense of security is increased.

  In other words, the disk playback apparatus according to the present invention can meet the needs for recording in a digital camera or digital video, and the importance of storing recorded media.

  Here, in the case of discs on the market, the playback situation changes not only due to aging but also due to light, scratches, disc distortion, and the like. The disk reproducing apparatus according to the present invention adaptively determines the deterioration state by changing the threshold value for deterioration determination according to the state of the disk.

  For example, the threshold value is changed by detecting a scratch. When a scratch is detected from the recording surface of the disk, the threshold is lowered slightly compared to a normal disk, and the user is notified that backup is to be taken even at a low error rate. Since the scratch is not directly related to the recording state, the evaluation is performed on the portion without the scratch, and the evaluation is performed based on the threshold value based on the scratch. Then, it is determined whether to notify the user of backup.

  In the compressed signal, the degree of influence differs for the same defect. Therefore, since the degree of disc quality varies depending on the recorded format, the threshold value may be changed according to the format of the recorded data.

  In addition, since the margin for error changes due to warping or distortion of the disc, the threshold value is changed. The playback quality deteriorates due to skew factors such as disk warpage and surface wobbling, but in the case of skew, the playback quality can be drastically reduced with respect to the amount of skew. Do.

  Further, even if the deterioration of the medium is determined based on the error rate, the influence on the data reproduction differs for each radial position in the disk type medium. For example, even with an error rate that can be normally reproduced on the inner track, there is a problem that as the track moves toward the outer periphery, it cannot be reproduced due to the influence of touching. Therefore, every time a disk is loaded, the disk recording surface is divided into a plurality of areas in the radial direction, such as the inner circumference, the middle circumference, and the outer circumference, and an error rate check corresponding to the radial position is performed in each area. You may make it take a technique.

  In addition, for a writing disk such as a CD-R or CD-RW, error rate data at the time of recording data may be taken, and the recording date and time and the status of the error rate may be recorded. . In such a case, based on the recording date and error rate read from the disk and the measurement result by the error rate measuring means, the deterioration curve of the disk can be calculated to determine the life of the disk.

According to a third aspect of the present invention, there is provided a computer program written in a computer-readable format so as to execute a process for reproducing data from a disk-type recording medium on a computer system.
A disk deterioration determination step for determining a disk deterioration state;
A user notification step for notifying the user when it is determined in the disk deterioration determination step that the deterioration of the disk has progressed over a predetermined level;
A computer program characterized by comprising:

According to a fourth aspect of the present invention, there is provided a computer program written in a computer-readable format so as to execute a process for reproducing data from a disk-type recording medium on a computer system.
An error rate measuring step for measuring an error rate when reproducing data from a disc;
A threshold comparison step for determining the degradation of the disk by determining the threshold of the error rate measurement value;
A computer program characterized by comprising:

  The computer program according to each of the third and fourth aspects of the present invention defines a computer program described in a computer-readable format so as to realize predetermined processing on the computer system. In other words, by installing the computer program according to the third and fourth aspects of the present invention in the computer system, a cooperative action is exhibited on the computer system. The same operational effects as those of the disk reproducing apparatus according to the second aspect can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the outstanding disc reproducing | regenerating apparatus and disc reproducing | regenerating method and computer program which can perform suitably the reproduction | regeneration processing of data from a portable recording medium can be provided.

  Further, according to the present invention, it is possible to provide an excellent disc playback apparatus, disc playback method, and computer program capable of performing data playback processing in accordance with the state of deterioration of the loaded recording medium.

  Further, according to the present invention, it is possible to provide an excellent disc playback apparatus, disc playback method, and computer program that can eliminate the user's anxiety about the progress of deterioration of the recording medium.

  In the future, in order to leave records and memorials, the need to leave records on digital cameras and digital videos will increase, and the importance of storing recorded media is expected to increase. According to the present invention, in such an environment, it is possible to suitably instruct the timing at which the recording medium should be backed up. As a result, the user can prevent loss of valuable data stored. In addition, the user's sense of security increases and the use of the recording medium is promoted.

  Also, the backup instruction function according to the present invention can be realized at low cost based on the design of an existing media recording / reproducing apparatus.

  Other objects, features, and advantages of the present invention will become apparent from more detailed description based on embodiments of the present invention described later and the accompanying drawings.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

A. System Configuration FIG. 1 schematically shows a hardware configuration of a disc playback apparatus according to an embodiment of the present invention.

  The disc reproducing apparatus shown in the figure reflects light depending on the presence or absence of pits when a recording surface is irradiated with laser light from a so-called optical disc type recording medium such as a CD-ROM (press CD), CD-R, or CD-RW. Data can be read based on changes in intensity. In these optical discs, the shortest data length (shortest pit length) and the longest data length (longest pit length) are defined as 3T and 11T, respectively, and data modulated by an EFM (Eight to Future Modulation) method that is DC-free is used. It is recorded.

  In the disk reproducing apparatus, a bus 2 is connected to a CPU (Central Processing Unit) 1, and a RAM (Random Access Memory) 3 as a working memory, program data 4a for system control, and parameter data for control are connected to the bus 2. A ROM (Read Only Memory) 4 in which 4b is written in a nonvolatile manner, a servo system signal processing section 5, a spindle motor 6 for rotating the optical disc 7 and an optical pickup 8 are connected via the servo system signal processing section 5. Has been.

  In addition, an equalizer 11 for waveform equalizing the RF signal from the RF signal processing unit 9 via the input / output port 10, and a digital clock for reproducing data using this clock after binarizing the output of the equalizer 11 A signal processor 12, an error correction process or the like is performed on the output from the digital signal processor 12, and a decoder 13 for decoding the data into the original data string, and a host computer for communicating with the host computer 18 The interface circuit 14 is connected.

  The host interface circuit 14 conforms to an interface standard such as USB (Universal Serial Bus) or SCSI (Small Computer System Interface). This disk reproducing apparatus is connected to a host system such as a personal computer via a host interface circuit 14 and an external bus 17.

  The servo system signal processor 5 synchronously controls the rotational drive of the spindle motor 6 and the scanning operation of the optical pickup 8 in the disk radial direction, and performs focusing and tracking operations.

When the disk playback device is turned on, the program data 4a stored in the ROM 4 is loaded into the main memory of the CPU 1, so that the CPU 1 has a RAM control means 15 as indicated by a broken line in the figure. And has a function as the system control means 16.

  The optical disk 7 that can be used in the disk reproducing apparatus is a CD-ROM, CD-R, CD-RW, or the like. Further, the disc playback apparatus can perform normal speed playback or x-times speed playback in accordance with a command from the host computer 18.

  The equalizer 11 is provided for the purpose of correcting eye pattern deterioration caused by MTF (Modulation Transfer Function). When reproducing the optical disc 7, the tail portion of the impulse response waveform of the output of the optical pickup 8 is widened due to the molding conditions of the disc, and the center of the eye pattern becomes dull. Unable to stabilize the price. Therefore, the equalizer 11 raises the high frequency region level of the RF reproduction waveform, for example, so that the digital signal processing unit 12 can perform binarization stably, and the deterioration of the MTF is equivalently corrected.

  When the optical disk 7 is loaded in the disk reproducing apparatus, the spindle motor 6 starts rotating, and the optical disk 7 is rotated at a constant linear velocity. When the rotational speed of the optical disk 7 becomes constant, the optical pickup 8 irradiates the recording surface with laser light and reads the reflected light. Since the intensity of the reflected light changes depending on the presence or absence of pits on the recording surface, data is read from the optical disc 7.

  Data read by the optical pickup 8 is supplied as a reproduction RF signal to the digital signal processing unit 12 via the RF signal processing unit 9 and the equalizer 11, and is reproduced as digital data by the digital signal processing unit 12. The digital data is supplied to the decoder 13, where error correction is performed in the decoder 13, and the original data array is restored.

B. Deterioration determination of media and backup instruction accompanying deterioration The disk reproducing apparatus according to the present embodiment observes the state of deterioration of a loaded disk, and notifies the user when the state of deterioration proceeds to some extent. As a notification method to the user, there is a backup instruction for the recorded contents of the disc. For the user, it is possible to suitably know the timing at which backup is to be performed, so that loss of valuable data stored can be prevented and the sense of security is increased. In other words, the disc playback apparatus according to the present embodiment can meet the needs for recording in a digital camera or digital video, and the importance of storing recorded media.

  The disc playback apparatus according to the present embodiment determines media degradation based on the error rate. That is, when the error rate becomes a value equal to or higher than a predetermined threshold per unit time, a signal instructing backup is generated.

  Here, the present inventors consider that it is not appropriate to apply a uniform threshold when determining media degradation based on an error rate. This is because the deterioration of the media is obvious depending on the state of the disk, and there is a high possibility that data will be lost if the backup instruction is not given to the user early.

  Therefore, in the present embodiment, adaptive deterioration state determination is performed by changing the threshold value according to the state of the disk. Specific examples of the disk status include the following items.

(1) The state of a scratch on the recording surface of the disc is detected, and a threshold value for generating a signal for instructing backup (or notifying of a media failure) is changed according to the detection result.
(2) Warpage or touch of the loaded optical disk 8 is detected, and a threshold value for generating a signal for instructing backup (or notifying a malfunction of the media) is changed according to the detection result.
(3) Based on the recording data compression method, the threshold value for generating a signal for instructing the backup (or notifying the malfunction of the media) is changed.

  Further, even if the deterioration of the medium is determined based on the error rate, the influence on the data reproduction differs for each radial position in the disk type medium. For example, even with an error rate that can be normally reproduced on the inner track, there is a problem that as the track moves toward the outer periphery, it cannot be reproduced due to the influence of touching. Therefore, in this embodiment, every time a disc is loaded, the disc recording surface is divided into a plurality of areas in the radial direction, such as the inner circumference, the middle circumference, and the outer circumference, and an error rate check is performed in each area. The method is adopted. However, when data is added to the disk, it is not always recorded by the same device, so it is preferable to perform measurement by determining a measurement position in the radial direction for each session.

  In FIG. 2, the disc playback apparatus according to the present embodiment realizes a function of determining media degradation based on the error rate and instructing the user to perform backup (or notifying the disc malfunction) based on the degradation state. Illustrates the configuration to do this.

  A signal is recorded on the recording surface of the optical disc 7 depending on the presence or absence of pits. The optical pickup 8 reads a signal recorded on the optical disk 7 based on a change in the intensity of reflected light according to the presence or absence of pits when the recording surface is irradiated with laser light.

  The RF signal processing unit 9 adds and amplifies the pit signals obtained from the optical pickup 8 and sends them to the digital signal processing unit 12. At that time, a tracking error signal and a focus error signal necessary for the servo are also generated and supplied to the servo signal processing unit 5.

  The servo signal processing unit 5 realizes access control on the recording surface of the optical disc 7 by synchronously performing the rotation operation of the optical disc 7 by the spindle motor 6 and the scanning operation of the optical pickup 8 in the disc radial direction. . Here, when the optical pickup 8 straddles a scratch, there is a problem that the track cannot be accurately traced by an erroneous error signal. In order to prevent this, the servo signal processing unit 5 has a function of generating a defect signal for notifying that a flaw has occurred.

  Further, if the irradiation laser light from the optical pickup 8 does not form an image on the pit with a sufficiently high image forming property, an error occurs in the read signal, or an error occurs in picking up the signal of the adjacent track. Therefore, in the present embodiment, when the optical disk 7 having a warp (skew) is reproduced, an aberration is generated due to the inclination of the disk recording surface with respect to the optical axis, so that the imaging property is not deteriorated. And a skew detector for detecting the skew amount. The entire optical pickup 8 (or only an optical system such as an objective lens) is tilted according to the skew amount, and adjustment for reducing aberration can be performed. The configuration of the skew detection unit itself is not the gist of the present invention. For example, the skew detection device described in Japanese Patent Laid-Open No. 7-262585, which has already been assigned to the present applicant, can be applied.

  The digital signal processing unit 12 reproduces the reproduction RF signal read by the optical pickup 8 as digital data. In this embodiment, the digital signal processing unit 12 includes an error rate counter 12-1 for counting an error rate, and disc determination is performed based on the value of this counter. The threshold management unit 12-2 stores a threshold for determining media degradation based on the error rate. The comparator 12-3 compares the threshold value extracted from the threshold value management unit 12-2 with the value of the error rate counter 12-1, and determines the disc. A detection signal is generated when the error rate becomes a value equal to or greater than a predetermined threshold per unit time.

  This detection signal is supplied to, for example, the display unit 12-5. The display unit 12-5 can notify the user that the state of deterioration of the disk has progressed to some extent, and can tell when to back up the recorded contents.

  Also, in the digital signal processing unit 12, a recording method detection unit 12-4 for determining data type compression or recording method and media type of the loaded disc is arranged. The recording method and the media type can be detected by analyzing, for example, TOC (Table Of Contents).

  Here, in the case of discs on the market, the playback situation changes not only due to aging but also due to light, scratches, disc distortion, and the like. In the present embodiment, as described below, adaptive deterioration state determination is performed by changing the deterioration determination threshold value stored in the threshold value management unit 12-2 according to the state of the disk. ing.

(1) The threshold value is changed by rewriting data on the threshold value management unit 12-2 by detecting a flaw.
(2) Depending on the recording method, for example, the compressed audio and the normal CD have different tolerances against errors, so the threshold value is changed according to the recording format.
(3) Since the margin for error changes due to warping or distortion of the disc, the threshold value is changed. The disk recording surface is divided into a plurality of areas in the radial direction, and deterioration of the disk is determined for each of the divided areas.

  In the disk reproducing apparatus according to the present embodiment, when the system part having the servo function straddles a flaw, a defect informing that the flaw has occurred is generated in order to prevent the track from being accurately traced by an erroneous error signal. A function for generating a signal is installed (described above). In general, the defect signal is used for servo control by detecting a flaw, but at the same time, it has pit loss information, so that an error can be predicted from the width of the signal.

  For example, when a defect signal is detected, the threshold value is slightly lowered as compared with a normal disk, and notification is made that backup is possible even with a small number of errors. Since the scratches are not directly related to the recording state, the evaluation is performed on the portion without the scratches, and the threshold management unit 12-2 applies the threshold based on the scratches to evaluate the deterioration state of the disc. Then, it is determined whether to notify the user of backup.

  Further, in the compressed signal, the degree of influence differs for the same defect, and the degree of disc quality varies depending on the recorded format. Therefore, the threshold value management unit 12-2 may change the deterioration determination threshold value according to the recording format of the disc.

  In addition, the reproduction quality is deteriorated due to a skew factor such as a warp or a surface deflection of the disk. However, in the case of the skew, the reproduction quality may be drastically deteriorated with respect to the skew amount. Therefore, the threshold management unit 12-2 sets the threshold taking into account the amount of skew.

  When a skew cancellation mechanism is provided as in the present embodiment, the threshold management unit 12-2 changes the threshold according to the amount of skew obtained from the cancellation mechanism. If the skew cancellation mechanism is not provided, the skew amount is detected from the amplitude of the error signal generated by the RF signal processing unit 9, and the threshold management unit 12-2 changes the threshold according to the magnitude. Further, since eccentricity and surface runout can be detected by the same method, the threshold value can be changed from the information.

  Further, even if the deterioration of the medium is determined based on the error rate, the influence on the data reproduction differs for each radial position in the disk type medium. For example, even with an error rate that can be normally reproduced on the inner track, there is a problem that as the track moves toward the outer periphery, it cannot be reproduced due to the influence of touching. Therefore, every time a disc is loaded, a method is adopted in which the disc recording surface is divided into a plurality of regions in the radial direction such as the inner circumference, the middle circumference, and the outer circumference, and an error rate check is performed in each area. However, when data is added to the disk, it is not always recorded by the same device, so it is preferable to perform measurement by determining a measurement position in the radial direction for each session.

  When a disc is loaded (loaded) in a disc playback device and played back, especially when data is stored, the entire surface is not played back. Therefore, by collecting the error rate data at the same time by using, for example, adjusting the skew for each area divided in the radial direction such as the inner and outer circumferences, the outer circumference side can be reproduced due to the problem of surface runout. The problem of disappearing is solved.

  FIG. 3 is a flowchart showing a processing procedure for disc degradation determination and user notification in the disc playback apparatus according to the present embodiment.

  When the disc is loaded into the disc playback device (step S1), the type of media is determined (step S2).

  At this time, since the copyright-protected disk cannot be backed up, it is excluded from the target of the backup instruction processing according to the present embodiment, and the subsequent check is not performed (step S3). However, since the data written on the recordable medium can be destroyed or erased after swapping, it can also be a target.

  On the other hand, if it is determined that the medium is recordable such as R or RW, the error rate data is collected together with the error rate count and the sector address in the case of a DVD, for example.

  At this time, in order to reflect the influence of the warp of the disk or the like, the error rate data is acquired separately for the inner circumference and the outer circumference (or radial position). That is, first, a jump is made to the target sector address (step S4), and error rate data is collected along with the sector address on the inner circumference side (step S5). At the same time, information such as scratches is recorded. Subsequently, jump to the target sector address (step S6), and on the outer periphery side, error rate data is collected together with the sector address, and at the same time information such as scratches is recorded (step S7).

  Next, the threshold value is changed according to the presence / absence of the scratches on the disk and the size thereof, and the error status of the disk is confirmed (step S8).

  If it is determined that the error status is at a level that requires data backup, the user is notified through the display unit 12-5 such as a display (step S9). It is also possible to display only the error status as a numerical value.

  As a modified example of the above-described disk deterioration determination process, the above check may be used as a temporary check, and detailed chucking may be performed except for the OK level. In the detailed check, there is a method of checking the presence or absence of scratches by checking PLAY or checking a wider range over the entire surface. Basically, it is better to detect dangerous discs as accurately as possible. Further, after the determination is made, more accurate determination can be made by updating the data anew while reproducing the actually recorded data.

  Further, as already described, in this embodiment, the threshold value for deterioration determination is adaptively changed based on the state of the disk. As the status of the disc, mainly the presence or absence of scratches on the recording surface, the warp or runout of the disc are observed.

FIG. 4 shows, in the form of a flowchart, a processing procedure for determining the deterioration of the disk using a threshold value corresponding to the disk condition and notifying the user in the disk reproducing apparatus according to the present embodiment.

  First, the error rate is measured in the access area of the loaded disc (step S11).

  Here, it is checked whether a flaw has been detected from the accessed area (step S12). When a flaw is detected, the threshold value for deterioration determination is changed (step S13).

  Next, it is checked whether there is a warp on the inner circumference side of the disk (step S14). If there is a warp on the inner circumference side, a temporary value 1 is set as a threshold value (step S15).

  Next, it is checked whether or not there is surface runout on the inner peripheral side of the disk (step S16). If there is surface deflection on the inner circumference side, a temporary value 1 is set as a threshold value (step S17).

  Next, it is checked whether there is a warp on the outer peripheral side of the disk (step S18). If there is a warp on the outer peripheral side, a temporary value 2 is set as a threshold value (step S19).

  Next, it is checked whether or not there is a runout on the outer peripheral side of the disk (step S20). If there is surface runout on the outer peripheral side, a temporary value 2 is set as the threshold value (step S21).

  Then, the temporary value 1 and the temporary value 2 are compared, and a smaller value is set as a threshold value for deterioration determination (step S22).

  Next, the error rate measured in step S1 is compared with the threshold value (step S23).

  When the measured error rate is larger than the threshold value, a backup instruction is given to the user (step S24). If the measured error rate is less than or equal to the threshold value, no backup instruction is given (step S25).

  The present invention has been described in detail above with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiment without departing from the gist of the present invention.

  In the present specification, an information reproducing apparatus for reproducing recorded data from a disk-type recording medium has been described as an example. However, the gist of the present invention is not necessarily limited to this. By applying the present invention to a device that reproduces data from a recording medium other than a disk type, it is possible to give a user a sense of security by giving a backup instruction corresponding to the deterioration of the medium. it can.

  In short, the present invention has been disclosed in the form of exemplification, and the description of the present specification should not be interpreted in a limited manner. In order to determine the gist of the present invention, the description of the scope of claims should be considered.

FIG. 1 is a diagram schematically showing a hardware configuration of a disc playback apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration for realizing the function of determining the deterioration of the media based on the error rate and instructing the user to perform backup based on the deterioration state in the disc playback apparatus according to the present invention. . FIG. 3 is a flowchart showing a processing procedure for disc degradation determination and user notification in the disc reproducing apparatus according to the present invention. FIG. 4 is a flowchart showing a processing procedure for determining the deterioration of the disk using a threshold value corresponding to the condition of the disk and notifying the user in the disk reproducing apparatus according to the present invention.

Explanation of symbols

1 ... CPU
2 ... Bus 3 ... RAM
4 ... ROM
DESCRIPTION OF SYMBOLS 5 ... Servo signal processing part 6 ... Spindle motor 7 ... Disk 8 ... Optical pick-up 9 ... RF signal processing part 10 ... Input / output port 11 ... Equalizer 12 ... Digital signal processing part 12-1 ... Error rate counter 12-2 ... Threshold management unit 12-3 ... comparator 12-4 ... recording method detection unit 12-5 ... display unit 13 ... decoder 14 ... host interface 18 ... host computer

Claims (13)

A disk playback device for playing back data from a disk-type recording medium,
Disc status detection means for detecting warpage or runout of the disc as the status of the disc ,
An error rate measuring means for measuring an error rate when reproducing data from a disc;
Comparing means for comparing the error rate measured by the error rate measuring means with a predetermined threshold and generating a detection signal when the error rate becomes a value equal to or higher than the threshold;
In response to the detection signal, user notification means for notifying the user that the state of disk degradation has progressed;
Threshold changing means for changing the threshold according to the status of the disk detected by the disk status detecting means;
A disc playback apparatus comprising: A disk playback device for playing back data from a disk-type recording medium,
Disk status detection means for detecting the status of the disk;
Data recording method detecting means for detecting compression or recording method of data recorded on the disc;
An error rate measuring means for measuring an error rate when reproducing data from a disc;
Comparing means for comparing the error rate measured by the error rate measuring means with a predetermined threshold and generating a detection signal when the error rate becomes a value equal to or higher than the threshold;
In response to the detection signal, user notification means for notifying the user that the state of disk degradation has progressed;
Changing the threshold according to the status of the disc detected by the disc status detection means, and changing the threshold according to the data recording method detected by the data recording method detection means;
A disc playback apparatus comprising: A disk playback device for playing back data from a disk-type recording medium,
Disk status detection means for detecting the status of the disk;
An error rate measuring means for dividing the disk recording surface into a plurality of areas in the radial direction and measuring the error rate for each divided area when reproducing data from the disk;
Comparing means for comparing the error rate measured by the error rate measuring means with a predetermined threshold and generating a detection signal when the error rate becomes a value equal to or higher than the threshold;
In response to the detection signal, user notification means for notifying the user that the state of disk degradation has progressed;
A threshold value changing means for changing the threshold value according to a radial position with respect to an error rate measurement result in each divided area, while changing the threshold value according to a disk condition detected by the disk condition detecting means;
Comprising
The comparison means compares the error rate measured for each area divided by the error rate measurement means with a corresponding threshold value.
A disc player characterized by that. The user notifying means prompts the user to take a backup of the disc determined to be deteriorated;
4. A disk reproducing apparatus according to claim 1, wherein the disk reproducing apparatus is a disk reproducing apparatus. The disc status detecting means detects a scratch on the disc recording surface;
4. A disk reproducing apparatus according to claim 1, wherein the disk reproducing apparatus is a disk reproducing apparatus. A disk playback method for playing back data from a disk-type recording medium,
As a disk status, a disk status detecting step for detecting warpage or runout of the disk;
An error rate measurement step for measuring an error rate when reproducing data from a disc;
A comparison step of comparing the error rate measured in the error rate measurement step with a predetermined threshold and generating a detection signal when the error rate becomes a value equal to or greater than the threshold;
In response to the detection signal, a user notification step for notifying the user that the state of deterioration of the disk has progressed;
A threshold value changing step for changing the threshold value according to the disk status detected in the disk status detecting step;
A disc reproducing method comprising: A disk playback method for playing back data from a disk-type recording medium,
A disk status detection step for detecting the status of the disk;
A data recording method detecting step for detecting a compression or recording method of data recorded on the disc;
An error rate measuring step for measuring an error rate when reproducing data from a disc;
A comparison step of comparing the error rate measured in the error rate measurement step with a predetermined threshold and generating a detection signal when the error rate becomes a value equal to or greater than the threshold;
In response to the detection signal, a user notification step for notifying the user that the state of deterioration of the disk has progressed;
Changing the threshold according to the status of the disc detected in the disc status detecting step, and changing the threshold according to the detected data recording method ;
A disc reproducing method characterized by comprising: A disk playback method for playing back data from a disk-type recording medium,
A disk status detection step for detecting the status of the disk;
An error rate measurement step for dividing the disk recording surface into a plurality of areas in the radial direction and measuring the error rate for each divided area when reproducing data from the disk;
A comparison step of comparing the error rate measured in the error rate measurement step with a predetermined threshold and generating a detection signal when the error rate becomes a value equal to or greater than the threshold;
In response to the detection signal, a user notification step for notifying the user that the state of deterioration of the disk has progressed;
The threshold value changing step for changing the threshold value according to the radius position for the error rate measurement result in each area, while changing the threshold value according to the disk status detected in the disk status detection step;
Have
In the comparison step, the error rate measured for each region divided in the error rate measurement step is compared with a corresponding threshold value.
A disc playback method characterized by the above. In the user notification step, the user is encouraged to take a backup of the disc determined to be deteriorated.
9. The disk reproducing method according to claim 6, wherein the disk reproducing method is a disk reproducing method. In the disk status detection step, a scratch on the disk recording surface is detected.
9. The disk reproducing method according to claim 6, wherein the disk reproducing method is a disk reproducing method. A computer program written in a computer-readable format so that a process for reproducing data from a disk-type recording medium is executed on a computer, the computer comprising:
Disc status detection means for detecting warpage or runout of the disc as the status of the disc,
An error rate measuring means for measuring an error rate when reproducing data from a disc;
Comparing means for comparing the error rate measured by the error rate measuring means with a predetermined threshold and generating a detection signal when the error rate becomes a value equal to or higher than the threshold;
In response to the detection signal, user notification means for notifying the user that the state of disk degradation has progressed;
Threshold changing means for changing the threshold according to the status of the disk detected by the disk status detecting means;
Computer program to function as A computer program written in a computer-readable format so that a process for reproducing data from a disk-type recording medium is executed on a computer, the computer comprising:
Disk status detection means for detecting the status of the disk;
Data recording method detecting means for detecting compression or recording method of data recorded on the disc;
An error rate measuring means for measuring an error rate when reproducing data from a disc;
Comparing means for comparing the error rate measured by the error rate measuring means with a predetermined threshold and generating a detection signal when the error rate becomes a value equal to or higher than the threshold;
In response to the detection signal, user notification means for notifying the user that the state of disk degradation has progressed;
Changing the threshold according to the status of the disc detected by the disc status detection means, and changing the threshold according to the data recording method detected by the data recording method detection means;
Computer program to function as A computer program written in a computer-readable format so that a process for reproducing data from a disk-type recording medium is executed on a computer, the computer comprising:
Disk status detection means for detecting the status of the disk;
An error rate measuring means for dividing the disk recording surface into a plurality of areas in the radial direction and measuring the error rate for each divided area when reproducing data from the disk;
Comparing means for comparing the error rate measured by the error rate measuring means with a predetermined threshold and generating a detection signal when the error rate becomes a value equal to or higher than the threshold;
In response to the detection signal, user notification means for notifying the user that the state of disk degradation has progressed;
A threshold value changing means for changing the threshold value according to a radial position with respect to an error rate measurement result in each divided area, while changing the threshold value according to a disk condition detected by the disk condition detecting means;
Function as
The comparison means compares the error rate measured for each area divided by the error rate measurement means with a corresponding threshold value.
Computer program.

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