JP2009252298A - Information processor, partial data providing apparatus, control method of information processor, control program of information processor, and recording medium with control program recorded thereon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processor capable of efficiently compensating an error part and performing reproduction without damaging image quality. <P>SOLUTION: The reproducing device 1 is for reproducing data recorded in an optical disk, and includes an error detection part 60 for detecting the error part in reproduction data recorded in the optical disk, a data acquisition part 61 for requesting download data 40 corresponding to the detected error part to a server unit 2 and acquiring them, and a reproduction processing part 63 for complementing the error part of the reproduction data by the acquired download data 40 and reproducing them. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an information processing apparatus for reproducing data recorded on an optical disc.

  Conventionally, optical disks such as CDs and DVDs have been widely used as recording media. In particular, in recent years, rewritable large-capacity phase change optical discs such as “Blu-ray Disc” have been developed, and the demand for optical discs is increasing.

  By the way, in the optical disk described above, if a recording medium is scratched by impact or the like, error correction may not be possible due to the scratch. In particular, since the optical disk can be directly touched on the recording surface by hand, there is a possibility that the recording surface may be touched and damaged to such an extent that error correction cannot be performed.

  That is, in the conventional optical disk, in order to repair the data error, an error correction code (ECC) or the like is added to correct the data error so as to reduce the error rate. However, if the recording surface of the optical disk is greatly damaged, it may not be recovered.

  Therefore, for example, techniques disclosed in Patent Documents 1 to 4 are disclosed as countermeasures against such damage.

  More specifically, Patent Document 1 discloses a disc player that, when a missing part is detected in compressed digital image data, creates repaired image data corresponding to the position of the missing part and fits into the missing part. In this disc player, the compressed digital image data can be displayed in a state where the image defect portion is not apparent.

  Further, Patent Document 2 discloses a playback apparatus that holds data obtained by highly compressing audio data to be played back in advance, and plays back the highly compressed data only at a location where an error occurs and cannot be read.

  Further, Patent Document 3 discloses an optical information recording medium in which a read-only memory sector and an additional recording sector are formed on the same surface. When an abnormality occurs in the read-only sector, the additional recording sector is disclosed. A technique for repairing a sector in which an abnormality has occurred using information recorded therein is disclosed.

Patent Document 4 discloses a technology that has a read-only recording area and a writable area in which a replica is written, and increases the repair capability of damage information while reducing redundancy compared to conventional ECC.
JP-A-8-237606 (published September 13, 1996) Japanese Patent Laying-Open No. 2005-243064 (published on September 8, 2005) JP-A-1-282734 (published on November 14, 1989) JP-A-2-246053 (published on October 1, 1990)

  However, the above-described conventional configuration causes a problem that video data cannot be restored by efficiently compensating for the missing portion without impairing the image quality.

  Specifically, Patent Document 1 has a problem that it can deal only with error data in one frame and cannot be repaired when error data occurs over several frames. According to Patent Document 2, it is necessary to store high-compression data of all video data to be reproduced in advance, and a high-compression image is reproduced in a portion where an error has occurred, so that the image quality is deteriorated. There's a problem.

  In the configurations of Patent Documents 3 and 4, it is not possible to appropriately acquire only data of missing portions that have occurred due to unexpected damage, such as scratches on the recording surface of an optical disc, and cannot use them during reproduction. For this reason, in Patent Documents 3 and 4, in order to cope with a missing portion caused by unexpected damage, a copy of all video data is stored in advance in an additional recording sector (writable area). It is necessary to keep. As described above, in order to deal with unexpected damage such as scratches on the recording surface of the optical disc, in Patent Documents 3 and 4, it is necessary to copy and record video data other than the missing portion in advance together. There is a problem that it is not efficient.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an information processing apparatus, a partial data providing apparatus, and an information processing apparatus that can efficiently compensate and reproduce an error part without losing image quality. A control method, a control program for an information processing apparatus, and a recording medium on which the control program is recorded are realized.

  An information processing apparatus according to the present invention is an information processing apparatus that reproduces data recorded on an optical disc in order to solve the above-described problem, and is reproduction data that is data to be reproduced and is recorded on the optical disc. In the above, a detecting means for detecting an error part which cannot be normally reproduced, and a partial data which is data corresponding to the error part detected by the detecting means are supplied to a partial data providing apparatus for holding the partial data. An acquisition means for requesting and acquiring from the partial data providing apparatus; and a reproduction means for reproducing the error data in the reproduction data with the partial data acquired by the acquisition means.

  Here, the error part includes a part that cannot be normally reproduced due to scratches in the recording layer of the optical disc, a part that is not normally recorded when the reproduction data is recorded and cannot be reproduced normally, and a part of the reproduction data is intentionally lost. For example, a portion that cannot be reproduced.

  According to the configuration described above, since the detecting means is provided, it is possible to detect whether or not there is an error portion in the reproduction data recorded on the optical disc.

  In addition, since the acquisition unit and the reproduction unit are provided, when the error part is detected by the detection unit, the partial data corresponding to the error part is acquired from the partial data providing device, and the acquired part is reproduced when reproducing the reproduction data. The error part can be complemented and reproduced by the data.

  As described above, in the information processing apparatus of the present invention, only the error part data can be acquired from the partial data providing apparatus, so that partial data can be efficiently acquired without requesting and acquiring unnecessary data. Can do. Further, when the error part is complemented and reproduced, the data (partial data) itself corresponding to the error part is reproduced, so that there is no problem that the image quality of the complement part is impaired.

  Therefore, the information processing apparatus according to the present invention has an effect that it is possible to perform reproduction while efficiently compensating for the error portion without impairing the image quality.

  The information processing apparatus according to the present invention further includes a first recording unit that records the partial data acquired by the acquisition unit in a storage device in the configuration described above, and the reproduction unit is recorded in the storage device. The partial data may be read and reproduced by complementing the error portion of the reproduction data.

  According to the above configuration, since the first recording unit is provided, the partial data acquired by the acquiring unit can be recorded in the storage device. For this reason, the reproducing means can read and use this partial data from the storage device when necessary.

  In the information processing apparatus according to the present invention, in the configuration described above, when the detection unit detects the error part, the detection unit acquires position specification information that is information for specifying a position of the error part in the reproduction data. And a second recording means for recording in the storage device an error part management table indicating a correspondence relationship between the position specifying information acquired by the detecting means and the detected error part, and the reproducing means comprises The partial data recorded by the first recording unit may be read with reference to the error part management table recorded by the second recording unit, and the error part may be complemented and reproduced. Good.

  According to the above configuration, since the error part management table is stored in the storage device, the reproduction unit can easily grasp the error part in the reproduction data. Further, since the error portion can be easily grasped, when reproducing the reproduction data, the error portion can be efficiently complemented by the acquired partial data.

  In the information processing apparatus according to the present invention, in the configuration described above, the optical disc is provided with a write-once area that is a write-once storage area separately from the storage area for storing the reproduction data. Means for recording the partial data obtained by the means in the additional recording area, wherein the reproducing means reads out the partial data recorded in the additional recording area and supplements and reproduces the error portion of the reproduced data. It may be configured to.

  According to the configuration described above, since the third recording unit is provided, the partial data acquired by the acquisition unit can be recorded in the additional recording area of the optical disc in which the reproduction data is recorded. For this reason, the reproducing means can read and use the partial data from the optical disk when necessary.

  In addition, since the reproduction data including the error portion and the partial data for complementing the error portion can be recorded together on the same optical disc, for example, the reproduction means similar to the present invention is provided. If the information processing apparatus is another information processing apparatus, the reproduction data including the error part can be appropriately complemented and reproduced.

  In the information processing apparatus according to the present invention, in the configuration described above, when the detection unit detects the error part, the detection unit acquires position specification information that is information for specifying a position of the error part in the reproduction data. And a fourth recording means for recording an error part management table indicating a correspondence relationship between the position specifying information acquired by the detecting means and the error part detected by the detecting means in the additional recording area, The means may be configured to read the partial data recorded in the additional recording area with reference to the error part management table recorded by the fourth recording means and supplement the error part for reproduction. Good.

  According to the above configuration, since the error part management table is stored in the additional recording area, the reproduction means can easily grasp the error part in the reproduction data. Further, since the error portion can be easily grasped, when reproducing the reproduction data, the error portion can be efficiently complemented by the acquired partial data.

  In the information processing apparatus according to the present invention, in the configuration described above, the optical disc includes an identification code for specifying the content of the reproduction data stored in the optical disc and partial data for holding the reproduction data. Presence position information, which is information for specifying the presence position of the providing device, is further recorded, and when the detection means detects the error portion, the identification code and the presence position information are detected together with the position specification information. The acquisition means transmits the identification code and the position specifying information to the partial data providing apparatus specified based on the presence position information acquired by the detection means, and transmits the partial data. It may be configured to request and obtain the partial data.

  According to the above configuration, since the existence position information is recorded on the optical disk on which the reproduction data is recorded, it is possible to easily specify the partial data providing device that is the acquisition destination of the partial data corresponding to the error portion of the reproduction data. Can do.

  Further, the information processing apparatus requests the partial data by transmitting the identification code and the position specifying information to the partial data providing apparatus. Therefore, the partial data providing apparatus can easily identify the partial data requested by the information processing apparatus according to the present invention and provide the partial data.

  Therefore, the information processing apparatus according to the present invention can efficiently acquire partial data from the partial data providing apparatus.

  In the information processing apparatus according to the present invention, in the configuration described above, in the optical disc, the data recording position is managed by a sector number, and the position specifying information corresponds to the recording position of the error portion of the reproduction data. It may be information indicating the sector number.

  According to the above configuration, since the position specifying information is the sector number corresponding to the recording position of the error part, it is possible to easily specify which part in the reproduction data becomes the error part using the sector number.

  In the information processing apparatus according to the present invention, in the configuration described above, the position specifying information may be information indicating a period corresponding to an error part in the reproduction period of the reproduction data.

  According to the above configuration, since the position specifying information is a period corresponding to the error part, it is possible to easily specify which part in the reproduction data becomes the error part depending on the time.

  In the information processing apparatus according to the present invention, the storage device may be detachably attached to the information processing apparatus. Examples of the storage device that is detachably attached to the information processing device include a memory card using a flash memory or the like.

  Thus, when the storage device is detachable, the partial data can be used in other information processing apparatuses other than the information processing apparatus of the present invention. Therefore, the reproduction data including the error part can be reproduced not only by the information processing apparatus according to the present invention but also by another information processing apparatus having the same components as the information processing apparatus.

  In order to solve the above problems, the partial data providing apparatus according to the present invention includes the detection means, the acquisition means, the reproduction means, the first recording means, the second recording means, the third recording means, and Full reproduction data, which is data in a complete state in which no error has occurred, of reproduction data recorded on an optical disc that is reproduced by an information processing apparatus provided with the fourth recording means, is stored in the information processing apparatus. An extraction means for extracting the partial data corresponding to the error part from the complete reproduction data in response to a request from the information processing apparatus, and a transmission means for transmitting the extracted partial data to the information processing apparatus. To do.

  According to the above configuration, since the extraction unit and the transmission unit are provided, the partial data requested by the information processing apparatus can be extracted from the complete reproduction data, and the extracted partial data can be provided to the information processing apparatus.

  As described above, the partial data providing apparatus according to the present invention can provide data of only the error part requested from the information processing apparatus. Therefore, the partial data providing apparatus efficiently provides partial data without transmitting unnecessary data. be able to. In addition, since the partial data providing device provides the data (partial data) corresponding to the error portion itself, when reproducing the reproduction data by the information processing device, the partial portion that supplemented the error portion based on the partial data and reproduced it There is no problem that the image quality of the image is impaired.

  Therefore, the partial data providing apparatus according to the present invention has an effect that it is possible to provide partial data so that the information processing apparatus can efficiently reproduce the error part without impairing the image quality.

  An information processing apparatus control method according to the present invention is an information processing apparatus control method for reproducing data recorded on an optical disc, and is a reproduction target recorded on the optical disc. The first step of detecting an error part that is a part that cannot be normally reproduced in the reproduction data that is the data of the data and the partial data that is the data corresponding to the error part detected in the first step are retained. A second step of making a request to the partial data providing device to be acquired, and a third step of reproducing by complementing the error portion of the reproduction data with the partial data acquired in the second step. It is characterized by including.

  Here, the error part includes a part that cannot be normally reproduced due to scratches in the recording layer of the optical disc, a part that is not normally recorded when the reproduction data is recorded and cannot be reproduced normally, and a part of the reproduction data is intentionally lost. For example, a portion that cannot be reproduced.

  According to the method described above, since the first step is included, it is possible to detect whether or not there is an error portion in the reproduction data recorded on the optical disc.

  In addition, since the second step and the third step are included, when an error part is detected in the first step, the partial data corresponding to the error part is acquired from the partial data providing device, and this data is acquired when reproducing the reproduction data. The error part can be complemented and reproduced by the partial data.

  As described above, in the control method of the information processing apparatus according to the present invention, only the error part data can be acquired from the partial data providing apparatus. Therefore, the partial data can be efficiently obtained without requesting and acquiring unnecessary data. Can be acquired. Further, when the error part is complemented and reproduced, the data (partial data) itself corresponding to the error part is reproduced, so that there is no problem that the image quality of the complement part is impaired.

  Therefore, the control method of the information processing apparatus according to the present invention has an effect that it is possible to efficiently perform reproduction while compensating for the error portion without impairing the image quality.

  The information processing apparatus may be realized by a computer. In this case, an information processing apparatus control program for causing the information processing apparatus to be realized by the computer by causing the computer to operate as the above-described means, and A computer-readable recording medium on which is recorded also falls within the scope of the present invention.

  As described above, the information processing apparatus according to the present invention is an information processing apparatus that reproduces data recorded on an optical disc. In the reproduction data that is the reproduction target data recorded on the optical disc, A detection unit that detects an error part that cannot be reproduced and a partial data that is data corresponding to the error part detected by the detection unit are requested to the partial data providing apparatus that holds the partial data. An acquisition means for acquiring from a partial data providing device, and a reproduction means for complementing and reproducing an error portion of the reproduction data with the partial data acquired by the acquisition means.

  Therefore, the information processing apparatus according to the present invention has an effect that it is possible to perform reproduction while efficiently compensating for the error portion without impairing the image quality.

  As described above, the partial data providing apparatus according to the present invention includes the detecting unit, the acquiring unit, the reproducing unit, the first recording unit, the second recording unit, the third recording unit, and the fourth recording unit. Holding complete reproduction data that is reproduced in an information processing apparatus provided with means and is in a complete state with no error in the reproduction data recorded on the optical disc, in response to a request from the information processing apparatus Correspondingly, there is provided an extracting means for extracting partial data corresponding to the error part from the complete reproduction data, and a transmitting means for transmitting the extracted partial data to the information processing apparatus.

  Therefore, the partial data providing apparatus according to the present invention has an effect that it is possible to provide partial data so that the information processing apparatus can efficiently reproduce the error part without impairing the image quality.

  As described above, the control method of the information processing apparatus according to the present invention is a control method of the information processing apparatus for reproducing data recorded on the optical disc, and is data to be reproduced recorded on the optical disc. In the reproduction data, a first step for detecting an error portion which is a portion that cannot be normally reproduced, and a partial data for holding the partial data as partial data corresponding to the error portion detected in the first step are provided. A second step of making a request to the device and acquiring it from the partial data providing device, and a third step of supplementing and reproducing the error portion of the reproduction data with the partial data acquired in the second step. It is characterized by.

  Therefore, the control method of the information processing apparatus according to the present invention has an effect that it is possible to efficiently perform reproduction while compensating for the error portion without impairing the image quality.

  An embodiment of the present invention will be described below with reference to FIGS. That is, the playback apparatus (information processing apparatus) 1 according to the present embodiment reads playback data 20 recorded on the optical disc 3 and plays back a moving image or the like based on the playback data 20 (playback processing). .

  When there is a damaged portion on the optical disc 3 or an unreadable unreadable portion in the recorded reproduction data 20, the reproducing apparatus 1 converts the data recorded in the damaged portion or the unreadable portion data into reproduced data. This is requested and acquired from the server device (partial data providing device) 2 that holds the complete version of 20 (download data acquisition processing). Hereinafter, the damaged part or the unreadable part is referred to as an error part (missing part).

  In addition, the playback device 1 reads the download data (partial data) 40, which is the data supplementing the error location, obtained by requesting the server device 2 in the playback processing of the playback data 20, at an appropriate timing, and identifies the error location. It can also be played while supplementing.

  As shown in FIG. 2, the playback device 1 is communicably connected to the server device 2 through a communication network. The playback device 1 according to the present embodiment is configured to connect to one server device 2, but may be configured to include a plurality of server devices 2 ... as connection destinations.

(Hardware configuration of playback device)
Here, the hardware configuration of the playback apparatus 1 will be described with reference to FIG. FIG. 2 illustrates an embodiment of the present invention, and is a block diagram illustrating the hardware configuration of each of the playback device 1 and the server device 2 included in the playback system 100.

  As shown in FIG. 2, the playback apparatus 1 according to the present embodiment includes an optical disk device 30, an optical disk control unit 31, a communication unit 32, an operation unit 33, a display control unit 34, a display device 35, a memory 36, and an external storage device. (Storage device) 37 and a main control unit 38.

  The optical disc device 30 reads data recorded on the optical disc 3 in response to a control instruction from the optical disc control unit 31, and conversely records data on a predetermined recording surface of the optical disc 3. The detailed configuration of the optical disc device 30 will be described later.

  The optical disk control unit 31 instructs the optical disk device 30 to read data from the optical disk 3 or to record data in response to a control instruction from the main control unit 38. . The optical disk control unit 31 also instructs the optical disk device 30 to detect an error location in the reproduction data 20 recorded on the optical disk 3 in response to a control instruction from the main control unit 38.

  The communication unit 32 controls to establish communication with the server device 2 through the communication network in response to an instruction from the main control unit 38.

  The operation unit 33 receives an instruction from a user who operates the playback apparatus 1 and can be realized by, for example, a numeric keypad, operation buttons, a keyboard, a mouse, a touch panel, and the like. The operation instruction from the user received by the operation unit 33 is input to the main control unit 38.

  The display control unit 34 performs display control of the display device 35 in response to a control instruction from the main control unit 38. The display device 35 displays an image, a moving image, or the like in the display area in accordance with display control from the display control unit 34. Examples of the display device 35 include an LCD (liquid crystal display) and a CRT (cathode-ray tube).

  The memory 36 is a recording device using a semiconductor element that stores data and programs, and can be realized by a RAM or the like, for example.

  The external storage device 37 is a readable / writable recording medium, and can be realized by, for example, a hard disk. As will be described later, the external storage device 37 stores download data 40 and a download data management table (error part management table) 41.

  The main control unit 38 instructs various controls of each unit provided in the playback device 1 according to the present embodiment, and can be realized by a CPU or the like, for example.

  Here, the configuration of the optical disc device 30 will be described with reference to FIG. FIG. 3 is a diagram showing an embodiment of the present invention, and is a perspective view showing a configuration of a main part of the optical disc device 30. As shown in FIG. As shown in FIG. 3, the optical disk device 30 according to the present embodiment records a data by irradiating a laser onto the recording surface of the rotating optical disk 3 and a spindle motor 21 that rotates the optical disk 3 to be read. And an optical head 11 for reading the recorded data.

  As shown in FIG. 3, the optical head 11 comprises a lens 23, a mirror 24, a beam splitter 25, a laser oscillator 26, an optical sensor 27, and a focusing / tracking coil 28 on a carriage (base) 22. It is.

  For example, when data is recorded on the optical disc 3, the optical head 11 outputs light from the laser oscillator 26 in response to a control instruction from the optical disc control unit 31, and transmits light to the lens 23 via the beam splitter 25 and the mirror 24. Is guided. Then, light is irradiated from the lens 23 to the optical disc 3. The irradiated light is focused on the recording layer of the optical disc 3 by the lens 23, and the layer material forming the recording layer is optically changed by heat. In this way, data is recorded on the recording layer of the optical disc 3.

  On the other hand, when reading the data recorded on the optical disc 3, light weaker than the light irradiated at the time of recording the above-mentioned data is focused on the data-recorded recording layer. Then, the reflected light passes through the lens 23 and is guided to the optical sensor 27 via the mirror 24 and the beam splitter 25. When receiving the reflected light, the optical sensor 27 converts the reflected light into an electric signal, and outputs the converted electric signal to the optical disc control unit 31.

  Further, the optical disc apparatus 30 includes a focusing / tracking coil 28 and performs so-called focusing to maintain the focus of the light irradiated on the optical disc 3 so as to be in focus with the recording layer, or the irradiated light accurately tracks the optical disc 3. So-called tracking is performed to control the irradiation position of light so as to follow.

(Software configuration of playback device for download data acquisition processing and playback processing)
A software configuration related to the download data acquisition processing and playback processing of the playback data 20 of the playback device 1 having the above-described hardware configuration will be described with reference to FIG. FIG. 1 shows an embodiment of the present invention, and is a block diagram showing a software configuration of a playback apparatus 1 related to download data acquisition processing and playback processing.

  As shown in FIG. 1, the playback apparatus 1 includes, as functional blocks, an error detection unit (detection unit) 60, a data acquisition unit (acquisition unit) 61, a download data recording unit (first recording unit, second recording unit, and third recording unit). Means, a fourth recording means) 62, and a reproduction processing section (reproducing means) 63. When the main control unit 38 provided in the playback device 1 is realized by a CPU, for example, these functional blocks can be realized by reading out a program (not shown) stored in the external storage device 37 to the memory 36 and executing the program.

  When the error detection unit 60 receives an error detection instruction from the operation unit 33, the error detection unit 60 instructs the optical disc control unit 31 to read the reproduction data 20 one sector at a time, and checks whether an error has occurred based on the reading result. Is. When the error detection unit 60 detects the occurrence of an error, the error number indicates the sector number (existing position information) indicating the error location, the identification code (disc ID) of the reproduction data 20 recorded in advance on the optical disc 3, and the reproduction data 20 Is transmitted to the data acquisition unit 61 together with the access address (URL) (position specifying information) to the server apparatus 2 that holds the information.

  That is, the reproducing apparatus 1 according to the present embodiment is configured to manage the error location of the reproduced data 20 recorded on the optical disc 3 by the sector number in the recording layer of the optical disc 3. The disc ID is information (identification code) for specifying the reproduction data 20 and is assigned for each content of the reproduction data 20. For example, even if reproduction data 20 having the same content is recorded on different optical disks 3, the disk IDs assigned to these optical disks are the same.

  When the data acquisition unit 61 receives from the error detection unit 60 the sector number indicating the error location, the disk ID of the reproduction data 20 to be reproduced, and the URL of the server device 2 that holds the complete reproduction data 70, the data acquisition unit 61 The connection destination is determined based on the URL. When the data acquisition unit 61 establishes communication with the server device 2 that is the URL destination via the communication unit 32, the data acquisition unit 61 transmits the sector number and the disk ID to the server device 2. Then, data for compensating the error portion, that is, download data 40 is requested.

  When the download data 40 is received from the server device 2, the data acquisition unit 61 transmits the download data 40 to the download data recording unit 62. The data acquisition unit 61 transmits not only the download data 40 but also the disc ID of the reproduction data 20 corresponding to the download data 40 and the sector number indicating the error location in the reproduction data 20 to the download data recording unit 62.

  The download data recording unit 62 stores the download data 40 acquired by the data acquisition unit 61 in the external storage device 37. Further, in order to manage the download data 40 stored in the external storage device 37, the download data recording unit 62 sets the disk ID of the reproduction data 20 corresponding to the download data 40 and the sector number of the error location in the reproduction data 20. The data acquisition unit 61 is configured to receive the data.

  The sector number of the error location is indicated by a set of a sector number (start sector) where the error location starts in the recording layer of the optical disc 3 and a sector number (end sector) where the error location ends. Specifically, as shown in FIG. 4, for each download data 40, the download data recording unit 62 download data management indicating the correspondence between these disk ID and sector number and the data file name of the download data 40. The table 41 is recorded in the external storage device 37. FIG. 4 is a diagram showing an example of the download data management table 41 according to the embodiment of the present invention.

  The reproduction processing unit 63 instructs the optical disc control unit 31 to read the reproduction data 20 recorded on the optical disc 3. In response to this instruction, the optical disk control unit 31 controls the optical disk device 30 to read the reproduction data 20. Further, when the reproduction processing unit 63 receives the reproduction data 20 sequentially read by the optical disc device 30 via the optical disc control unit 31, the reproduction processing unit 63 sends the reproduction data 20 to the display control unit 34 and instructs to reproduce it. .

  If the reproduction data 20 includes an error part, the reproduction processing unit 63 refers to the download data management table 41 to obtain the download data 40 corresponding to the reproduction data 20 to be read, and the reproduction data 20 has an error. The display control unit 34 is also instructed to supplement the portion and reproduce. The reproduction processing unit 63, the display control unit 34, and the display device 35 implement the reproduction unit of the present invention.

  That is, in the reproducing apparatus 1 according to the present embodiment, the optical disk apparatus 30 reads the reproduction data 20 in order from the sector that is the reading start position of the reproduction data 20 as shown in FIG. The read processing unit 63 sequentially receives the read data via the optical disc control unit 31. When the optical disk device 30 reads the reproduction data 20 until the start position of the error location, that is, before the start sector, the reproduction processing unit 63 acquires the download data 40 from the external storage device 37 while referring to the download data management table 41. Then, the reproduction processing unit 63 transmits the download data 40 acquired from the external storage device 37 to the display control unit 34 and instructs the display device 35 to reproduce the download data 40. When the reproduction based on the download data 40 is completed, the reproduction processing unit 63 instructs the optical disk control unit 31 to instruct the reading again from the reproduction data 20 recorded in the sector next to the end sector of the error part. As described above, the reproduction processing unit 63 can perform reproduction based on the download data 40 with respect to the error portion in the reproduction data 20, and can reproduce the error portion of the reproduction data 20 with complement.

  FIG. 5 shows an embodiment of the present invention, and is a diagram showing an outline of a reproduction data reading procedure in the reproduction apparatus 1.

  Next, the configuration of the server device 2 connected to the playback device 1 having the above-described configuration through a communication network and providing the download data 40 to the playback device in response to a request from the playback device 1 will be described.

(Hardware configuration of server device)
First, the hardware configuration of the server device 2 will be described with reference to FIG. As shown in FIG. 2, the server device 2 according to the present embodiment is configured to include a server communication unit 50, a server main control unit 51, a server database 52, and a server memory 53.

  The server communication unit 50 establishes communication with the playback apparatus 1 through a communication network in response to an instruction from the server main control unit 51.

  The server main control unit 51 is for performing various controls of each unit included in the server device 2 and can be realized by, for example, a CPU.

  The server database 52 holds and manages original data (original reproduction data 70) of the reproduction data 20 recorded on the optical disc 3. In the server database 52, the original reproduction data (complete reproduction data) 70 is managed in association with the recording position (sector number) when the copy is recorded on the optical disc 3. For example, when the original reproduction data 70 is moving picture data compressed by MPEG, the GOP from where to where in the original reproduction data 70 is managed so as to correspond to which sector in the recording layer of the optical disc 3. . In addition to the original reproduction data 70, the server database 52 manages reproduction data as a management table for searching the original reproduction data 70 requested by the reproduction apparatus 1 from a plurality of original reproduction data 70. A table 71 is also recorded.

  The server memory 53 is a recording device using a semiconductor element that stores data and programs, and can be realized by a RAM or the like, for example.

(Server device software configuration)
Next, the software configuration of the server apparatus 2 having the above-described hardware configuration will be described with reference to FIG. FIG. 6 is a block diagram illustrating a software configuration of the server apparatus 2 according to the embodiment of the present invention.

  As shown in FIG. 6, the server main control unit 51 is configured to include a download data search unit (extraction unit) 80 and a request response processing unit (transmission unit) 81 as functional blocks.

  When the request response processing unit 81 receives a transmission request for data (download data 40) of an error location from the reproducing apparatus 1 that has established communication via the server communication unit 50, the request response processing unit 81 transmits the requested download data 40 to the server. The download data search unit 80 is instructed to search from the database 52. Further, when the request response processing unit 81 receives the download data 40 retrieved from the download data retrieval unit 80, the request response processing unit 81 controls the server communication unit 50 and transmits it to the playback device 1.

  The request response processing unit 81 receives a control instruction for requesting the download data 40 from the playback apparatus 1 and a disk ID related to the download data 40 and a sector number (start sector, end sector) indicating an error location. Then, the received disk ID and sector number are transmitted to the download data search unit 80 to instruct search of the download data 40 requested by the playback apparatus 1.

  Upon receiving the control instruction requesting the download data 40, the disk ID, and the sector number indicating the error location from the request / response processing unit 81, the download data search unit 80 is identified by the disk ID in the server database 52. The original reproduction data 70 is searched. Then, in the retrieved original reproduction data 70, data corresponding to the sector number portion indicating the error location is extracted as download data 40.

  The download data search unit 80 transmits the download data 40 extracted as described above to the request response processing unit 81 and instructs the playback apparatus 1 to transmit it.

  As described above, in the playback system 100 according to the present embodiment, the playback apparatus 1 executes the download data acquisition process, and the download data 40 acquired by the download data acquisition process compensates for the error portion of the playback data 20. However, the reproduction process was performed.

  Hereinafter, details of the download data acquisition process and the reproduction process will be described. The download data acquisition process will be further subdivided into “error location detection process” and “download process”.

(Error location detection process)
First, “error location detection processing” executed by the playback apparatus 1 according to the present embodiment will be described with reference to FIG. FIG. 7 shows an embodiment of the present invention and is a flowchart showing an example of “error location detection processing” in the playback apparatus 1.

  The “error location detection process” will be described as being performed in response to an execution instruction from the operation unit 33.

  First, when the main control unit 38 receives an instruction to execute “error location detection processing” from the operation unit 33, the error detection unit 60 in the main control unit 38 sets an error flag (not shown) recorded in the memory 36 to 0. Set (step S1, hereinafter referred to as S1).

  The error flag is a flag for managing whether or not the current state is a state in which an error is detected by the error detection unit 60. In the present embodiment, when the error flag is 0, the current state indicates that no error location is detected on the optical disc 3, and when the error flag is 1, the error location is detected on the optical disc 3 as the current status. The state that has been done.

  Next, the error detection unit 60 instructs the optical disc control unit 31 to read the reproduction data 20 recorded on the optical disc 3 for one sector. In response to this instruction, the optical disc control unit 31 controls the optical disc device 30 so as to read data for one sector from the reading start position of the reproduction data 20 on the optical disc 3 (S2).

  When the error detection unit 60 receives the result of reading data for one sector by the optical disk device 30 via the optical disk control unit 31, it is determined from this read result whether an error has occurred in the sector from which data was read. (S3).

  If the error detection unit 60 determines that an error has occurred (“YES” in S3), it determines whether the error flag recorded in the memory 36 is set to 1 (S7). If the determination in step S7 is “NO”, that is, if the error flag is not set to 1, the sector where this error is detected becomes the first error location, that is, the start sector of the error location. Therefore, the error detection unit 60 sets the sector number from which this data has been read as the start sector (S8). Then, the error detection unit 60 sets the error flag from 0 to 1 (S9), and instructs the optical disc control unit 31 to read the next one sector. In response to an instruction from the error detection unit 60, the optical disc control unit 31 operates the optical disc apparatus 30 to move the optical head 11 to the next sector position (S5), and causes the next sector data to be read. .

  On the other hand, if the determination in step S7 is “YES”, that is, if the occurrence of an error has already been detected, the process proceeds directly to step S5, where the error detection unit 60 reads the next one sector, and the optical disc control unit 31 To instruct.

  If it is determined that no error has occurred in the data read result (“NO” in S3), the error detection unit 60 determines whether the error flag is set to 1 (S4).

  Here, when the error flag is set to 1 (“YES” in S4), the sector number one before the sector indicating the recording position of the data determined to have no error by the error detection unit 60 Is the end sector of the error location (S10).

  That is, the case where the error flag is set to 1 even though the occurrence of an error has not been detected means that the detected error has disappeared (the error location has ended). Therefore, the error detection unit 60 sets the sector number one prior to the sector indicating the recording position of the data determined to have no error as the end sector. Thus, the error location can be specified by the combination of the start sector and the end sector recorded in step S8. When the end sector is set in step S10, the error detection unit 60 changes the error flag from 1 to 0 again (S11). In this way, by changing the setting of the error flag from 1 to 0, the error detection unit 60 can manage a change in the state in which there is no error after the sector number of the optical disk 3 currently being read. .

  Conversely, if no error has occurred ("NO" in S3) and the error flag is not set to 1 ("NO" in S4), no error has been detected from the sector being read. Means. Therefore, the error detection unit 60 instructs the optical disc control unit 31 to move to the next sector position and perform reading (S5).

  When the error detection unit 60 changes the setting of the error flag from 1 to 0, the error detection unit 60 acquires data (download data 40) corresponding to the error location specified by the combination of the start sector and the end sector from the server device 2 next. The data acquisition unit 61 is instructed.

  In response to the instruction from the error detection unit 60, the data acquisition unit 61 performs a download process for the download data 40 corresponding to the error location (S12). Details of this download process will be described later. When the download process is completed, the error detection unit 60 instructs to move to the next sector position and read data (S5).

  In the reproducing apparatus 1, the above-described processing is continued until the reading position by the optical disk apparatus 30 reaches the last sector position on the optical disk 3 (S6). In the playback apparatus 1 according to the present embodiment, the last sector position is the sector position immediately before the sector position where the error detection unit 60 determines that there is no data recorded on the optical disc 3. It is a configuration. For this reason, the optical disk device 30 actually reads up to the sector position where the data recorded on the optical disk 3 disappears.

  As described above, when data is read until the last sector position on the optical disc 3 is reached in the reproducing apparatus 1, the error detection unit 60 determines whether or not the error flag is set to 1 (S13). Here, the case where the error flag is set to 1 (“YES” in S13) is a case where the occurrence of an error continues to the last sector position. Therefore, if “YES” in the step S13, the error detection unit 60 sets the sector position immediately before the reading position (sector position where data is lost) of the optical disc device 30 as the end sector (S14). Then, the error detection unit 60 instructs the data acquisition unit 61 to acquire from the server device 2 data (download data 40) corresponding to the error location specified by the combination of the start sector and the end sector.

  In response to the instruction from the error detection unit 60, the data acquisition unit 61 executes the download process of the download data 40 corresponding to the error location in the same manner as step S12 described above (S15).

  As described above, the optical disc apparatus 30 according to the present embodiment reads data for each sector on the optical disc 3 and can confirm the presence or absence of an error location. When an error location is detected, download data 40 corresponding to the error location can be acquired by download processing.

(Download process)
Next, details of the above-described download process (download process shown in steps S12 and S15) will be described with reference to FIG. FIG. 8 shows an embodiment of the present invention and is a flowchart showing an example of “download processing” in the playback apparatus 1.

  First, the data acquisition unit 61 is instructed to acquire the download data 40 from the error detection unit 60. At this time, the data acquisition unit 61, from the error detection unit 60, the start sector and the end sector indicating the error location, the disc ID for identifying the reproduction data 20 read in the “error location detection process”, and the download data The URL of the server apparatus 2 indicating the acquisition source of 40 is received (S111).

  Then, the data acquisition unit 61 instructs the communication unit 32 to establish communication with the server device 2 specified by the received URL (S112). When communication is established with the server device 2 in this way, the download data 40 is requested to the server device 2 and the start sector, end sector, and disk ID are transmitted (S113).

  On the other hand, when the server device 2 receives the request for the download data 40 from the playback device 1, the server device 2 specifies the download data 40 based on the start sector, the end sector, and the disk ID, and transmits it to the playback device 1.

  In this way, in the playback device 1, the data acquisition unit 61 acquires the download data 40 from the server device 2, and the download of the download data 40 is completed (S114). Then, the data acquisition unit 61 transmits the acquired download data 40 to the download data recording unit 62 and instructs it to be stored in the external storage device 37. In response to the instruction from the data acquisition unit 61, the download data recording unit 62 stores the download data 40 in the external storage device 37 (S115). Further, the download data recording unit 62 records the disk ID, the start sector, the end sector, and the file name of the download data 40 regarding the stored download data 40 in the download data management table 41 (S116).

  As described above, the playback apparatus 1 according to the present embodiment can execute the “download process”. Next, the “reproduction process (reproduction process α)” of the reproduction data 20 having an error portion using the download data 40 downloaded in this way will be described with reference to FIG. FIG. 9 shows an embodiment of the present invention and is a flowchart showing an example of “reproduction process α” of the reproduction apparatus 1.

(Reproduction process α)
First, it is assumed that the reproduction apparatus 1 according to the present embodiment executes the reproduction process α by receiving a reproduction process instruction at the operation unit 33. As a premise, it is assumed that there is an error location in the playback data 20 to be played back, and download data 40 corresponding to this error location has been acquired by the download process described above. In addition, it is assumed that the reproduction data 20 to be reproduced is recorded from the sector number 0 of the optical disc 3.

  When the reproduction processing instruction is received by the operation unit 33, the reproduction processing unit 63 receives this instruction. The reproduction processing unit 63 instructs the optical disc control unit 31 to operate the optical disc device 30 and causes the disc ID to be read from the optical disc 3. In this way, when the reproduction processing unit 63 obtains the disk ID (S21), it confirms the record of the download data management table 41 corresponding to the disk ID (S22). That is, the reproduction processing unit 63 confirms and reads the start sector, end sector, and data file name corresponding to the acquired disk ID.

  In this way, information for reading the download data 40 is acquired in advance, and the reproduction processing unit 63 reproduces the reproduction data 20.

  That is, the reproduction processing unit 63 instructs the optical disc control unit 31 to move the position of the optical head 11 of the optical disc apparatus 30 to the position where the sector number is 0 (sector 0) (S23). Then, the reproduction processing unit 63 determines whether or not the position where the optical head is moved matches the position of the start sector read in step S22 (S24).

  If they do not match (“NO” in S24), the reproduction processing unit 63 instructs the optical disc control unit 31 to read the reproduction data 20 for one sector. In response to an instruction from the reproduction processing unit 63, the optical disc control unit 31 controls the optical disc device 30 to read the reproduction data 20. Then, the optical disc control unit 31 transmits the read reproduction data 20 to the reproduction processing unit 63. Thus, the reproduction data for one sector is read (S25).

  The reproduction processing unit 63 decodes the read reproduction data (S26). Then, the decoded reproduction data is transmitted to the display control unit 34 and is reproduced by the display device 35. Thereby, the video of the read reproduction data 20 can be reproduced on the display device 35 (S27).

  When a video based on the reproduction data 20 for one sector is displayed, the reproduction processing unit 63 instructs the optical disc control unit 31 to move the optical head 11 to the next sector. In response to this instruction, the optical disk control unit 31 operates the optical disk device 30 and moves the optical head 11 to the sector next to the sector from which the reproduction data 20 has been read (S28). Then, the reproduction processing unit 63 confirms whether the moved sector is the last sector in the recording layer of the optical disc 3 (S29). If the sector is the last sector (“YES” in S29), the reproduction processing is terminated. If it is not the last sector (“NO” in S29), the process returns to step S24 and the process is repeated.

  On the other hand, if “YES” is determined in the step S24, that is, if the sector corresponding to the position of the optical head 11 coincides with the start sector, the reproduction processing unit 63 downloads the download data 40 corresponding to the read data file name. Is read from the external storage device 37 (S30). The read download data 40 is decoded (S31). Then, the reproduction processing unit 63 transmits the decoded download data 40 to the display control unit 34 and reproduces it on the display device 35 (S32). Although not specified in the processing of steps S30 to S32 shown in FIG. 9, the playback processing unit 63 is configured to read, decode, and play back the download data 40 one sector at a time from the start sector to the end sector. Has been.

  When the download data 40 is reproduced in this way, the reproduction processing unit 63 instructs the optical disc control unit 31 to move the position of the optical head 11 to the sector position next to the end sector. In response to the instruction from the reproduction processing unit 63, the optical disc control unit 31 operates the optical disc apparatus 30 and moves the optical head 11 (S33).

  Then, the reproduction processing unit 63 confirms whether the moved sector is the last sector in the recording layer of the optical disc 3 (S29). When the sector is the last sector (“YES” in S29), the reproduction processing is terminated. If it is not the last sector (“NO” in S29), the process returns to step S24 and the process is repeated.

  As described above, the reproduction apparatus according to the present embodiment can perform the reproduction process based on the reproduction data 20 while supplementing the error portion with the download data 40. In the above-described “reproduction process α”, the case where there is one download data 40 that compensates for an error portion of the reproduction data 20 has been described for convenience of explanation. However, there may be a plurality of error locations in the reproduction data 20, and a plurality of download data 40... May be required to compensate for each error location. When there are a plurality of download data 40 as described above, the start sector to be confirmed in step S24 is naturally set for each download data 40.

(Download data provision process)
Next, download data provision processing in the server apparatus 2 that provides the download data 40 to the playback apparatus 1 will be described with reference to FIG. FIG. 10 shows an embodiment of the present invention, and is a flowchart showing an example of “download data provision processing” in the server device 2.

  First, in the server device 2, the request response processing unit 81 receives a transmission request for the download data 40 from the playback device 1 that has established communication (S41). Further, the request response processing unit 81 receives the disk ID, the start sector, and the end sector from the reproducing apparatus 1 (S42). Then, the request response processing unit 81 transmits the disc ID, start sector, and end sector to the download data search unit 80.

  The download data search unit 80 reads the corresponding original reproduction data 70 from the server database 52 with reference to the reproduction data management table 71 based on the received disk ID (S43). Then, based on the received start sector and end sector, the corresponding data is extracted from the read original reproduction data 70 (S44). Then, the download data search unit 80 transmits the extracted data to the request response processing unit 81. The request response processing unit 81 transmits the received extracted data as download data 40 to the playback apparatus 1 that has established communication (S45). In this way, the server device 2 performs download data provision processing on the playback device 1.

  As described above, since the playback apparatus 1 according to the present embodiment includes the error detection unit 60, it can detect whether or not there is an error location in the playback data 20 recorded on the optical disc 3.

  In addition, since the data acquisition unit 61 and the reproduction processing unit 63 are provided, when an error location is detected by the error detection unit 60, the download data 40 corresponding to the error location is acquired from the server device 2 and the reproduction data 20 The error data can be supplemented and reproduced by the acquired download data 40 at the time of reproduction.

  In this way, since data corresponding only to the error location can be acquired from the server device 2, unnecessary data is not requested and acquired from the server device 2. For this reason, the download data 40 can be acquired efficiently. Further, when the error part is complemented and reproduced, data is reproduced using the data corresponding to the error part (downloaded data) itself, so that there is no problem that the image quality of the complement part is impaired.

  Therefore, the reproducing apparatus 1 can perform reproduction while efficiently compensating for the error part without impairing the image quality.

  Further, the playback device 1 described above is configured to request the transmission of the download data 40 by transmitting the information of the start sector and the end sector together with the disk ID to the server device 2. However, the playback apparatus 1 further includes a time conversion table 43 indicating the playback start time of data for each sector number as shown in FIG. 11, and includes start time and end time information instead of the start sector and end sector. It is good also as a structure which transmits. As described above, when the playback device 1 acquires the download data 40 by transmitting the start sector and the end sector, the server device 2 manages the original playback data 70 by the playback time and extracts a desired playback time portion. Will be. FIG. 11 is a diagram showing an example of the time conversion table 43 according to the present embodiment.

  Note that the external storage device 37 that stores the download data 40 downloaded from the server device 2 may be a hard disk that is integrally provided as the playback device 1, or a memory card that uses a flash memory or the like. The player 1 may be detachable. When the external storage device 37 is detachable like a memory card, the download data 40 can be used in other playback devices. Therefore, the reproduction data 20 including the error part can be reproduced not only by the reproduction apparatus 1 according to the present embodiment but also by other reproduction apparatuses having the same components as the reproduction apparatus 1.

  In addition, as shown in FIG. 12, the optical disk 3 from which the reproduction data 20 is read may have both a data read-only area 90 and a recordable area (recordable area) 91. In such a configuration, the download data 40 and the download data management table (error part management table) 141 for managing the download data 40 are stored in the additionally recordable area 91 instead of being stored in the external storage device 37. It can also be made.

  In the case where the download data 40 and the download data management table 141 are recorded in the additionally recordable area 91 as described above, the download data recording unit 62 in the configuration shown in FIG. Instruct to write the data. The optical disc control unit 31 operates the optical disc device 30 in accordance with an instruction from the download data recording unit 62 and records the download data 40 and the download data management table 141 on the optical disc 3. That is, the download data recording unit 62, the optical disc control unit 31, and the optical disc apparatus 30 implement the third recording unit and the fourth recording unit of the present invention.

  Further, when the download data 40 and the download data management table 141 are stored in the additionally recordable area 91 of the optical disc 3 as described above, the download data management table 141 has a data structure as shown in FIG. FIG. 13 is a diagram showing an example of the data structure of the download data management table 141 held by the playback apparatus according to the present embodiment.

  That is, the download data management table 141 is a recording in which the start sector and end sector indicating the error location of the reproduction data 20 recorded in the read-only area 90 and the download data 40 corresponding to this error location are recorded in the recordable area 91. The correspondence relationship between the alternative start sector that is the start position and the alternative end sector that is the end position is shown. These correspondences are recorded in association with the download data 40.

  In this way, the download data management table 141 records the alternative start sector and alternative end sector of the download data 40 to be written in the recordable area 91 in addition to the start sector and end sector. It can be grasped in which part the download data 40 is recorded. In particular, since the download data 40 is variable length data, it is particularly advantageous in terms of management of the download data 40 to specify the sector range in which the download data 40 is recorded by the alternative start sector and the alternative end sector. .

  In addition, since the position where the download data 40 is recorded in the additionally recordable area 91 can be specified, other acquired download data can be continuously written in the additionally recordable area 91.

  The playback device 1 can execute the “playback process β” as shown in FIGS. 14 and 15 with reference to the download data management table 141 shown in FIG. FIGS. 14 and 15 show another embodiment of the present invention, and are flowcharts showing an example of “reproduction process β” in the reproduction apparatus 1. FIG. 14 shows a process of reading the download data 40 recorded in the additionally recordable area 91, and FIG. 15 shows a process of reproducing the playback data 20 after the download data is read.

(Reproduction process β)
First, it is assumed that the playback apparatus 1 according to the present embodiment executes the playback process β by receiving a playback process instruction at the operation unit 33. As a premise, it is assumed that there is an error location in the playback data 20 to be played back, and download data 40 corresponding to this error location has been acquired by the download process described above. In addition, it is assumed that the reproduction data 20 to be reproduced is recorded from the sector number 0 of the optical disc 3.

  When the reproduction processing instruction is received by the operation unit 33, the reproduction processing unit 63 receives this instruction. The reproduction processing unit 63 instructs the optical disc control unit 31 to operate the optical disc apparatus 30, and moves the optical head 11 to the top address position of the additionally recordable area on the optical disc 3 (S51). Then, the reproduction processing unit 63 confirms whether the download data 40 is recorded in the additionally recordable area 91 (S52).

  If the download data 40 is recorded in the additionally recordable area 91 (“YES” in S52), the reproduction processing unit 63 instructs the optical disc control unit 31 to start sector for each recorded download data 40. , End sector, alternate start sector, and alternate end sector are instructed to be read. In response to this instruction, the optical disc control unit 31 operates the optical disc device 30 to read the start sector, end sector, alternative start sector, and alternative end sector from the additionally recordable area of the optical disc 3 (S53). On the other hand, if “NO” in the step S52, the reproduction processing unit 63 instructs the optical disc control unit 31 to move the optical head 11 to the position of the sector 0 on the optical disc 3, and proceeds to step S56 described later. .

  The reproduction processing unit 63 stores the read start sector, end sector, alternative start sector, and alternative end sector in the memory 36 (S54).

  Next, the reproduction processing unit 63 instructs the optical disc control unit 31 to move the optical head 11 to the sector next to the substitution end sector read in step S53. In response to the instruction from the reproduction processing unit 63, the optical disc control unit 31 moves the optical head to the sector next to the substitution end sector (S55). Then, the reproduction processing unit 63 further confirms whether the download data 40 is recorded (S52).

  In this manner, in the additionally recordable area 91, the start sector, the end sector, the alternative start sector, and the alternative end sector are sequentially written in the memory 36 for each download data 40. As described above, when the start sector, the end sector, the alternative start sector, and the alternative end sector are saved in the memory 36 for all the download data 40 recorded in the additionally recordable area 91, the reproduction processing unit 63 causes the optical disc control unit to 31 is instructed to move the optical head 11 to the position of sector 0 on the optical disc 3. In response to this instruction, the optical disk control unit 31 operates the optical disk device 30 and moves the optical head 11 to the sector 0 (S56).

  Then, the reproduction processing unit 63 determines whether or not the position of the optical head 11 from which the reproduction data 20 is read matches the start sector (S57). If they do not match in this determination (in the case of “NO” in S57, that is, while the position of the optical head 11 from which the reproduction data 20 is read does not coincide with the start sector), the reproduction data until the last sector position on the optical disc 3 is reached. Are read and decoded one sector at a time (S57 to S62). Note that the processing from step S57 to step S62 is the same as the processing from step S24 to step S29 shown in FIG.

  On the other hand, when the position of the optical head 11 from which the reproduction data 20 is read matches the start sector (“YES” in step S57), the reproduction processing unit 63 determines the position of the optical head 11 with respect to the optical disc control unit 31. Instruct to move to the alternative start sector of the download data 40. In response to this instruction, the optical disc control unit 31 operates the optical disc apparatus 30 and moves the optical head 11 to the alternative start sector (S63). When the optical head 11 moves to the alternative start sector, the download data 40 is read one sector at a time, and the read result is received by the reproduction processing unit 63 via the optical disc control unit 31.

  The reproduction processing unit 63 decodes the read download data 40 (S64), outputs it to the display control unit 34, and reproduces it on the display device 35 (S65). Thus, when the download data 40 for one sector is reproduced, the reproduction processing unit 63 confirms whether the sector position of the read download data 40 is the substitution end position. Here, if it is not the alternative end sector (“NO” in S66), the processing from step S64 to S66 is repeated until the alternative end sector is reached.

  On the other hand, when it is determined in step S66 that the sector is an alternative end sector (“YES” in S66), the reproduction processing unit 63 instructs the optical disc control unit 31 of the end sector to which the read download data 40 corresponds. Instruct to move the optical head 11 to the next sector. In response to this instruction, the optical disk control unit 31 operates the optical disk device 30 and moves the optical head 11 to the sector next to the end sector (S67). Then, the above-described reproduction processing (processing from S57 to S68) is repeated until the position of the optical head 11 comes to the last sector position on the optical disc 3.

  Further, the case where the download data 40 and the download data management table 141 are recorded in the additionally recordable area 91 on the same layer as the read-only area 90 has been described above. However, the optical disk 3 has a plurality of recording layers, and the read-only area 90 and the recordable area 91 may be recorded in different layers.

  As described above, when the read-only area 90 and the recordable area 91 are recorded in different layers, it is necessary to change the focal length of the optical head 11 each time in order to read data across a plurality of layers. is there. For this reason, since the light quantity irradiated from the optical head 11 is switched according to the layer from which data is read, it takes time and continuous data is interrupted. Therefore, it is difficult to continuously reproduce the reproduction data 20 and the download data 40 as in the case where the recordable area 91 and the read-only area 90 are recorded in the same layer.

  Therefore, when the read-only area 90 and the recordable area 91 are recorded in different layers, the download data 40 and the download data management table 41 written in the recordable area 91 are read into the memory 36 first, 16 and the data structure shown in FIG. Thereafter, the reproduction data 20 recorded in the read-only area 90 is read.

  FIG. 16 is a diagram showing an example of the data structure of the download data management table 41 recorded in the memory 36 included in the playback device 1 according to the present embodiment. FIG. 17 is a diagram showing an example of the data structure of the download data 40 recorded in the memory 36 included in the playback device 1 according to the present embodiment.

  That is, in the memory 36, a data file (FIG. 16) showing the correspondence between the start sector, the end sector, the alternative start address, the alternative end address, and the download data 40... Read from the download data management table 141 are recorded. File (FIG. 17) is created.

(Regeneration processing γ)
Hereinafter, with reference to FIGS. 18 and 19 and FIGS. 13, 16, and 17 described above, the reproduction process (reproduction process γ) when the read-only area 90 and the recordable area 91 are recorded in different layers. Will be described. FIG. 18 and FIG. 19 show another embodiment of the present invention and are flowcharts showing an example of “reproduction processing γ” in the reproduction apparatus 1. FIG. 18 shows a process for reading the download data 40 recorded in the additionally recordable area 91, and FIG. 19 shows a part of the read process and a process for reproducing the reproduction data 20 after the download data 40 is read. Show.

  First, it is assumed that the download data management table 141 and the download data 40 shown in FIG. 13 are recorded in the additionally recordable area 91 in a recording layer different from the layer in which the reproduction data is recorded.

  Here, first, the process from the recordable area 91 to the download data management table 141 and the download data 40 recorded in the memory 36 will be described.

  First, when the playback device 1 receives a playback processing instruction via the operation unit 33, the playback processing unit 63 receives this instruction. The reproduction processing unit 63 instructs the optical disc control unit 31 to operate the optical disc apparatus 30, and moves the optical head 11 to the top address position of the recordable area 91 on the optical disc 3 (S71).

  Next, the reproduction processing unit 63 sets the pointer A to indicate the write start position of the download data management table 141 in the memory 36 (S72). Further, the reproduction processing unit 63 sets the pointer B so as to indicate the write start position of the download data 40 in the memory 36 (S73). Further, the reproduction processing unit 63 confirms whether the download data 40 is recorded in the additionally recordable area 91 (S74).

  When the download data 40 is recorded in the additionally recordable area 91 (“YES” in S74), the reproduction processing unit 63 instructs the optical disk control unit 31 to start sector for each recorded download data 40. , End sector, alternate start sector, and alternate end sector are instructed to be read. In response to this instruction, the optical disk control unit 31 operates the optical disk device 30 to read the start sector, end sector, replacement start sector, and replacement end sector from the recordable area 91 of the optical disk 3 (S75).

  On the other hand, if “NO” in the step S 74, the process of recording the download data management table 141 and the download data 40 from the additionally recordable area 91 in the memory 36 is not executed. Therefore, the reproduction processing unit 63 instructs the optical disc control unit 31 to move the optical head 11 to the position of sector 0 on the optical disc 3, and proceeds to step S83 described later.

  As shown in step S75 described above, when the optical disc control unit 31 reads the start sector, end sector, alternative start sector, and alternative end sector for each download data 40 in accordance with an instruction from the reproduction processing unit 63, reproduction is performed. The processing unit 63 writes data as follows. That is, the reproduction processing unit 63 writes the read start sector, end sector, and pointer B values (that is, the address indicating the recording start position of the download data 40 (alternative start address)) from the position of the pointer A in the memory 36. (S76). By this step S76, from the position indicated by the pointer A to the start sector (1), end sector (1), and alternative start address (1) shown in FIG. 16 are recorded.

  Next, the reproduction processing unit 63 changes the position indicated by the pointer A to the end of the data written in the memory 36 by the processing up to step S76 (S77). Thereby, it is possible to indicate the recording start position of the alternative end address indicating the tail end of the download data 40 obtained by actually writing the download data 40.

  In addition, the reproduction processing unit 63 instructs the optical disc control unit 31 to read the download data 40 (data (1)) from the substitution start sector to the substitution end sector. Then, the read download data 40 is written from the position on the memory 36 indicated by the pointer B (S78).

  Furthermore, the reproduction processing unit 63 changes the pointer B to a position indicating the end of the written download data 40 (S79). Further, the reproduction processing unit 63 writes the address indicated by the pointer B as the substitution end address (substitution end address (2)) from the position of the pointer A changed in step S77 (S80). Through the processing up to this point, the memory 36 includes the start sector (1), end sector (1), alternative start address (1), and alternative end address (2) recorded in the download data management table 141 shown in FIG. Will be written. Also, the data (1) shown in FIG.

  Next, the reproduction processing unit 63 changes the position indicated by each of the pointer A and the pointer B to a data write start position related to the next download data 40 (S81). That is, for the new download data 40 recorded in the additionally recordable area 91, the download data 40 and the download data management table 41 are recorded in the memory 36. Therefore, the addresses indicated by the pointer A and the pointer B are as follows: Change to

  That is, the address indicated by the pointer A becomes the next address after the position where the alternative end address (2) is written, and the address indicated by the pointer B becomes the next address after the position where the download data 40 (data (1)) is written. Change as follows.

  Further, the reproduction processing unit 63 instructs the optical disc control unit 31 to operate the optical disc apparatus 30 and moves the optical head 11. Then, the optical disk device 30 moves the optical head 11 to the head of the start sector that comes to the sector next to the substitution end sector read in the recordable area 91 (S82). Then, the reproduction processing unit 63 confirms whether there is more download data in the additionally recordable area 91 based on the read result by the optical head 11 (S74).

  That is, the above-described processing from step S71 to step S81 is performed on all the download data management table 41 and download data 40 recorded in the additionally recordable area 91. When all the download data management table 41 and download data 40 are recorded in the memory 36, the reproduction processing unit 63 moves the optical head 11 to the position of sector 0 on the optical disc 3 with respect to the optical disc control unit 31. Instruct. In response to this instruction, the optical disc control unit 31 operates the optical disc apparatus 30 to move the optical head 11 to the position of sector 0 (S83).

  Then, the reproduction processing unit 63 determines whether or not the position of the sector read by the optical head 11 matches the start sector recorded in the memory 36 (S84). When this determination is “NO” (in the case of “NO” in S84, that is, while the position of the optical head 11 from which the reproduction data 20 is read does not coincide with the start sector), from step S25 to step S28 shown in FIG. In the same manner as the above process, the processes from step S85 to step S88 are performed.

  On the other hand, when the position of the optical head 11 from which the reproduction data 20 is read coincides with the start sector (in the case of “YES” in step S84), the reproduction processing unit 63 uses the alternative start address and the alternative end address recorded in the memory 36. read out. When the alternative start address and the alternative end address are read, the reproduction processing unit 63 reads the download data 40 from the alternative start address to the alternative end address from the memory 36 (S90). The reproduction processing unit 63 decodes the read download data 40 (S91), outputs it to the display control unit 34, and reproduces it on the display device 35 (S92). When the download data 40 is reproduced in this way, an instruction is given to move the optical head 11 to the next sector of the end sector corresponding to the download data 40 being read. In response to this instruction, the optical disc control unit 31 operates the optical disc apparatus 30 and moves the optical head 11 to the sector next to the end sector (S93). Then, it is determined whether or not the position of the optical head 11 comes to the last sector position on the optical disc 3 (S89), and the above-described reproduction process (the processes from S84 to S93) is repeated until it comes to the last sector position (YES in S89). .

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  Finally, each block of the playback apparatus 1 according to the present embodiment, particularly the error detection unit 60, the data acquisition unit 61, the download data recording unit 62, and the playback processing unit 63 may be configured by hardware logic. Alternatively, it may be realized by software using a CPU as follows.

  That is, the playback device 1 includes a CPU (central processing unit) that executes instructions of a control program that realizes each function, a ROM (read only memory) that stores the program, a RAM (random access memory) that expands the program, A storage device (recording medium) such as a memory for storing the program and various data is provided. An object of the present invention is to provide a recording medium on which a program code (execution format program, intermediate code program, source program) of a control program of the playback apparatus 1 which is software that realizes the above-described functions is recorded so as to be readable by a computer This can also be achieved by supplying the playback apparatus 1 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).

  Examples of the recording medium include a tape system such as a magnetic tape and a cassette tape, a magnetic disk such as a floppy (registered trademark) disk / hard disk, and an optical disk such as a CD-ROM / MO / MD / DVD / CD-R. Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.

  Further, the playback apparatus 1 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Also, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  An information processing apparatus according to the present invention includes a detection unit that detects a missing portion in reproduction data recorded on an optical disc, an acquisition unit that acquires data (partial data) of the missing portion from another information processing device, Since it has playback means that complements and plays back the missing part of the playback data with the acquired partial data, playback data recorded on the optical disc can be supplemented with partial data and played efficiently even if it is not complete Can do. Therefore, the present invention can be widely applied when it is necessary to supplement and reproduce reproduction data that is not complete.

FIG. 3 is a block diagram illustrating a software configuration of a playback device related to download data acquisition processing and playback processing according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention, and is a block diagram illustrating hardware configurations of a playback device and a server device provided in a playback system. 1 is a diagram illustrating an embodiment of the present invention, and is a perspective view illustrating a configuration of a main part of an optical disk device. It is a figure which shows embodiment of this invention and shows an example of a download data management table. FIG. 5 is a diagram illustrating an embodiment of the present invention and an outline of a reproduction data reading procedure in a reproduction apparatus. 1, showing an embodiment of the present invention, is a block diagram illustrating a software configuration of a server device. FIG. FIG. 9 is a flowchart illustrating an example of “error location detection processing” in the playback device according to the embodiment of the present invention. FIG. 9 is a flowchart illustrating an example of “download processing” in the playback device according to the embodiment of this invention. 7 is a flowchart illustrating an example of “reproduction processing α” of the reproduction apparatus according to the embodiment of the present invention. FIG. 9 is a flowchart illustrating an example of “download data provision processing” in the server device according to the embodiment of this invention. It is a figure which shows an example of the time conversion table which concerns on this Embodiment. It is a figure which shows an example of the storage area of the optical disk which concerns on embodiment of this invention. It is a figure which shows an example of the data structure of the download data management table which the reproducing | regenerating apparatus concerning this Embodiment hold | maintains. 12 is a flowchart showing another embodiment of the present invention and showing an example of “reproduction process β” in the reproduction apparatus. 12 is a flowchart showing another embodiment of the present invention and showing an example of “reproduction process β” in the reproduction apparatus. It is a figure which shows an example of the data structure of the download data management table recorded on the memory with which the reproducing | regenerating apparatus concerning this Embodiment is provided. It is a figure which shows an example of the data structure of the download data recorded on the memory with which the reproducing | regenerating apparatus concerning this Embodiment is provided. 12 is a flowchart showing another embodiment of the present invention and showing an example of “reproduction processing γ” in the reproduction apparatus. 12 is a flowchart showing another embodiment of the present invention and showing an example of “reproduction processing γ” in the reproduction apparatus.

Explanation of symbols

1. Playback device (information processing device)
2 Server device (partial data providing device)
3 Optical disc 20 Reproduction data 30 Optical disc device (third recording means, fourth recording means)
31 Optical disk control unit (third recording means, fourth recording means)
32 Communication unit 34 Display control unit (reproduction means)
35 Display device (reproduction means)
36 Memory 37 External storage device (storage device)
38 Main control unit 40 Download data (partial data)
41 Download data management table (error part management table)
51 Server main control unit 52 Server database 60 Error detection unit (detection means)
61 Data acquisition unit (acquisition means)
62 Download data recording section (first recording means, second recording means, third recording means, fourth recording means)
63 Reproduction processing unit (reproduction means)
70 Original playback data (complete playback data)
71 Reproduction data management table 80 Download data search unit (extraction means)
81 Request response processing unit (transmission means)
90 Read-only area 91 Additional writeable area (appendable area)
141 Download data management table (error part management table)

Claims (13)

An information processing apparatus for reproducing data recorded on an optical disc,
Detection means for detecting an error portion that is a portion that cannot be normally reproduced in the reproduction data that is the reproduction target data recorded on the optical disc,
An acquisition means for requesting and acquiring from the partial data providing apparatus a partial data providing apparatus that holds the partial data, partial data that is data corresponding to the error part detected by the detecting means;
An information processing apparatus comprising: a reproducing unit that complements and reproduces an error portion of the reproduction data with the partial data acquired by the acquisition unit. A first recording means for recording the partial data acquired by the acquisition means in a storage device;
2. The information processing apparatus according to claim 1, wherein the reproduction unit reads the partial data recorded in the storage device and reproduces the data by complementing an error portion of the reproduction data. The detection means, when detecting the error portion, obtains position specifying information that is information for specifying the position of the error portion in the reproduction data,
A second recording means for recording in the storage device an error part management table indicating a correspondence relationship between the position specifying information acquired by the detection means and the detected error part;
The reproducing means reads out the partial data recorded by the first recording means with reference to the error part management table recorded by the second recording means, and reproduces the data by complementing the error part. The information processing apparatus according to claim 1. In addition to the storage area for storing the reproduction data, the optical disc is provided with a write-once area that is a recordable storage area.
A third recording means for recording the partial data acquired by the acquiring means in the additional recording area;
The information processing apparatus according to claim 1, wherein the reproduction unit reads the partial data recorded in the additional recording area and reproduces the error by complementing an error portion of the reproduction data. The detection means, when detecting the error portion, obtains position specifying information that is information for specifying the position of the error portion in the reproduction data,
A fourth recording unit for recording an error part management table indicating a correspondence relationship between the position specifying information acquired by the detection unit and the error part detected by the detection unit in the additional recording area;
The reproducing means refers to the error part management table recorded by the fourth recording means, reads the partial data recorded in the additional recording area, and reproduces the error part by complementing it. The information processing apparatus according to claim 4. The optical disc includes an identification code for specifying the content of the reproduction data stored on the optical disc, and location information that is information for specifying the location of the partial data providing apparatus that holds the reproduction data. And are further recorded,
The detection means acquires the identification code and the presence position information together with the position specifying information when detecting the error portion,
The acquisition means requests the partial data by transmitting the identification code and the position specifying information to the partial data providing apparatus specified based on the presence position information acquired by the detection means, and requests the partial data The information processing apparatus according to claim 3, wherein: In the optical disc, the data recording position is managed by the sector number,
7. The information processing according to claim 3, wherein the position specifying information is information indicating a sector number corresponding to a recording position of an error part of the reproduction data. apparatus.   The information processing apparatus according to claim 3, wherein the position specifying information is information indicating a period corresponding to an error part in a reproduction period of the reproduction data. .   The information processing apparatus according to claim 2, wherein the storage device is detachably attached to the information processing apparatus. 10. Complete reproduction data that is reproduced in the information processing apparatus according to any one of claims 1 to 9 and that is reproduction data recorded on an optical disc, which is complete data with no error, is retained. ,
In response to a request from the information processing apparatus, extraction means for extracting partial data corresponding to the error portion from the complete reproduction data;
A partial data providing apparatus comprising: a transmission unit configured to transmit the extracted partial data to the information processing apparatus. An information processing apparatus control method for reproducing data recorded on an optical disc,
A first step of detecting an error portion that is a portion that cannot be normally reproduced in the reproduction data that is the reproduction target data recorded on the optical disc;
A second step of requesting the partial data providing apparatus holding the partial data for partial data, which is data corresponding to the error part detected in the first step, and acquiring the partial data from the partial data providing apparatus;
And a third step of supplementing and reproducing the error portion of the reproduction data with the partial data acquired in the second step.   A control program for an information processing apparatus for causing a computer to function as each unit of the information processing apparatus according to any one of claims 1 to 9.   The computer-readable recording medium which recorded the control program of the information processing apparatus of Claim 12.

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