JP2007310988A - Digital audio and video content transfer system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely and surely transfer digital AV content from transmitter equipment to receiver equipment in digital AV content transfer between two recording and reproducing apparatuses, and further to eliminate the need for dedicated controller equipment for performing transfer control. <P>SOLUTION: In the transmitter equipment and the receiver equipment of the digital AV content, a content transfer information managing means 205 of the transmitter equipment manages a transfer state of the digital AV content as transfer information, and enables transferring the digital AV content without break by resuming the transfer of the digital AV content based on the transfer information when the transfer of the digital AV content is interrupted and resumed. Further, a transfer mode selection means 213 selects an optimum transfer mode for the digital AV content transfer according to the conditions such as a communication bus band, the transfer of the digital AV content is made possible even in a case of lapsing into an insufficient communication band. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to digital AV content for recording movement control and movement control when recording digital AV content distributed from a content provider and moving the recorded digital AV content to another recording medium.

  In recent years, with the progress of digitalization of radio broadcasts, the spread of digital AV equipment is accelerating. In these digital AV devices, digital recording without reducing the quality of the digital AV content distributed from the content provider is attractive to the user, while the digital AV content that should be protected is illegally digitally copied and leaked. The danger of doing is pointed out. This problem, which can seriously damage copyrights for digital AV content producers and content providers, cannot be ignored.

  In order to avoid such problems, a mechanism for restricting digital copying has been introduced and put into practical use for digital AV content distributed from content providers.

  However, if digital AV content is protected using this mechanism, the user cannot back up the content once recorded to another device. In other words, since it is impossible to back up digital AV content once recorded on a hard disk or the like installed in a device, it is important to record a program on a hard disk already saturated with the recorded digital AV content. It must be said that the contents are to be erased and the convenience is low.

  Therefore, instead of being able to take a backup of the digital AV content that has been recorded once, a configuration of “digital AV content movement” for moving and evacuating the digital AV content recorded on a certain recording medium to another recording medium has been proposed, It is used in various digital AV devices (see Patent Document 1).

  By using the configuration described in Patent Document 1, the user can freely move digital AV content. However, if the power of the device is turned off or a problem occurs in the course of the movement during the movement of the digital AV content, a part or all of the digital AV content is lost, and the user will never again have the digital AV content. May not be able to be referenced. From the user's point of view, there is a problem that the convenience of the user is impaired because the digital AV content once recorded cannot be easily moved to another medium.

  In order to solve this problem, by preparing a controller device that manages a source device and a destination device in an environment in which the source device and the destination device are connected by a high-speed general-purpose bus, Some move (see Patent Document 2).

  In the conventional digital AV content moving system described in Patent Document 2, data loss that may occur due to a trouble that occurs when moving digital AV content is prevented by the following method.

  FIG. 30 is a configuration diagram of a conventional digital AV content moving system.

  FIG. 31 is a diagram showing the state of the moving digital AV content.

  A conventional digital AV content moving system will be described with reference to FIGS. 30 and 31. FIG.

  A digital AV content transmitting device 101 that is a tuner (not shown) having a recording medium 100, a digital AV content receiving device 103 having a recording medium 102, a digital AV content transmitting device 101, and a digital AV content receiving device 103 A digital AV content movement controller 104 that controls the movement operation of the digital AV content by a computer and a set top box (hereinafter referred to as STB) 114 are connected by a communication bus 105.

  The digital AV content movement controller 104 includes a movement source control unit 106 that manages the operation of the digital AV content transmission device 101, a movement destination control unit 107 that manages the operation of the digital AV content reception device 103, and a moved state in the digital AV content. A position management unit 108 that manages the position and the reproducible position is provided. The digital AV content transmitting apparatus 101 reads out the digital AV content to be moved from the recording medium 100 and controls the operation of the digital AV content management unit 109 that transmits the digital AV content onto the bus 105 and the operation of the digital AV content movement controller 104. A former monitoring unit 110. The control source monitoring unit 110 includes a command execution restriction unit 111 that executes only commands that meet specific conditions.

  When the movement of the digital AV content is started by a user operation, the digital AV content transmitting device 101 reproduces the read digital AV content 116, and the digital AV content receiving device 103 writes the reproduced read digital AV content 116 to the written digital AV content. By recording as 117, the moving operation of the digital AV content is performed. If any of the digital AV content transmitting device 101 or the digital AV content receiving device 103 becomes abnormal while moving the digital AV content 116, either the source control unit 106 or the destination control unit 107 detects the error. Then, the position management unit 108 updates the digital AV content moved position, and interrupts the digital AV content movement operation. At this time, based on the moved position of the digital AV content, the position management unit 108 sets a position that has been rewound in the head direction of the digital AV content by a predetermined time ΔT as a reproducible position. When the digital AV content is returned to the state in which the digital AV content can be moved again, the digital AV content transmitting device 101 plays the digital AV content from the playable position and resumes the moving operation of the digital AV content. The digital AV content receiving apparatus 103 forms ΔT as a margin 115 in the written digital AV content 117 and records it on the recording medium 102, thereby preventing the digital AV content from being lost due to the interruption of the digital AV content moving operation.

  In addition, during the movement operation of the digital AV content read from the recording medium 100 to the recording medium 102, the command execution restriction unit 111 rejects a command from other than the digital AV content movement controller 104, so that the user's intention is achieved. It is supposed to prevent the contrary movement of the digital AV content.

Here, in Patent Document 2, ΔT is determined to be 1 minute or less in normal reproduction, and in the digital AV content during the moving operation, a portion in which one minute in normal reproduction has elapsed after being read from the recording medium 100 is described. In addition, it may be set such that reproduction from the recording medium 100 is impossible sequentially.
JP 2000-149417 A Japanese Patent Laid-Open No. 2005-158056

  However, in the conventional configuration, the following problems occur due to the interruption / resumption of the digital AV content moving operation.

  If the interruption / resumption of the digital AV content movement operation is generated a plurality of times, a margin is formed in the digital AV content after the movement every time the movement operation is resumed, and the digital AV content recorded on the recording medium 100 is transferred to the recording medium 102. The original purpose of evacuating as it is cannot be achieved. From the user's point of view, it is not easy to use content movement, which is not convenient.

  In addition, when the STB 114 sends the satellite program broadcast content to the digital AV content receiving device 103 to the communication bus 105 before the digital AV content movement is interrupted for some reason and resumed, the digital AV content transmitting device 101 again becomes the digital AV content. When attempting to resume the AV content moving operation, the band on the communication bus 105 necessary for moving the digital AV content cannot be obtained, and the satellite program broadcast content transmission from the STB 114 must be stopped in order to move the digital AV content. The result is not easy to use.

  Accordingly, the object of the present invention has been made in view of such problems, and the source device that is the source of the digital AV content and the destination device that is the destination of the digital AV content are on the same bus. In the digital AV content moving system connected to the network, if an accident such as a cable disconnection occurs during the movement of the digital AV content, and the digital AV content movement is interrupted and restarted, a break occurs before and after the interruption, and the digital AV content moves correctly. A digital AV content migration system that prevents digital AV content migration from the source device to the destination device safely and reliably, and eliminates the need for a dedicated controller device to control the migration It is to be.

  In order to solve the above-described problem, the digital AV content moving system according to the first aspect of the present invention is configured such that a source recording / playback device and a destination recording / playback device are connected to each other via a predetermined communication bus. A digital AV content moving system for moving digital AV content to be moved to a playback device, wherein the source recording / playback device includes a source recording medium, a source storage element, and a digital recorded on the source recording medium A source control unit that controls the source recording / playback device to read and transmit the AV content to the source memory device. The destination recording / playback device includes a destination recording medium, a destination storage element, a destination A destination control unit that controls the destination recording / playback device so that the digital AV content received by the storage element is read and written to the destination storage medium. The source control unit forms a segment by inquiring means for inquiring about the size of a destination storage element capable of receiving and processing the digital AV content at one time by the destination recording / reproducing device, and dividing the digital AV content into a first size. In addition, a segmentation unit that divides the segment into a second size that does not exceed the size of the destination storage element and forms a block, and generates movement information about the segment and block of the digital AV content recorded on the source recording medium Moving information management means for managing the data, reading means for reading the digital AV content recorded on the source recording medium, encryption means for encrypting the content protection portion of the read digital AV content, and digital AV content to the communication bus And a destination control unit is provided with a communication bus. Receiving means for receiving the data, decrypting means for decrypting the encrypted content protection portion received by the receiving means, and digital AV content including the content protection portion decrypted by the decrypting means to the destination recording medium A recording means for recording, and a recording information notifying means for generating recording information for each segment and notifying the source recording / reproducing device when recording the received digital AV content on the destination recording medium, The means updates the movement information based on the received recording information and performs the movement operation of the digital AV content while recording the updated movement information on the movement source recording medium.

  The digital AV content migration system according to a second aspect is the digital AV content migration system according to the first aspect, wherein the source control unit records on the destination recording medium based on the recording information notified by the recording information notification means. A re-transmission unit that re-sends only a predetermined block included in the predetermined segment to the destination recording / reproducing device.

  In the digital AV content moving system according to the third invention, in the digital AV content moving system according to the second invention, the retransmission means temporarily suspends the retransmission processing of the corresponding block when the moving operation of the predetermined block has failed a predetermined number of times. Set retransmission limit.

  The digital AV content moving system according to a fourth aspect is the digital AV content moving system according to the first, second, or third aspect, wherein the source control unit transmits the digital AV content from a plurality of moving modes. A movement method selection means for selecting one movement method is provided.

  A digital AV content migration system according to a fifth aspect of the present invention is the digital AV content migration system according to the first aspect of the present invention, wherein the segment is sized to fit within 60 seconds of the actual playback time, and the content protection area (copyright protection area) ) Or any other region.

  A digital AV content migration system according to a sixth aspect is the digital AV content migration system according to the first aspect, wherein the source control unit assigns the segment of the content protection area based on the recording information notified by the recording information notification means. Reproduction prohibiting means for prohibiting reproduction of one or more contained blocks from the movement source recording medium is provided.

  A digital AV content moving system according to a seventh aspect is the digital AV content moving system according to the first, second, third, fourth, fifth or sixth aspect, wherein the segment is composed of one or more blocks.

  A digital AV content moving system according to an eighth aspect of the present invention is the digital AV content moving system according to the first, second, third, fourth, fifth, sixth or seventh aspect, wherein the source recording / playback device or the destination recording / playback device is a broadcaster. A tuner for receiving programs is provided.

  A digital AV content migration system according to a ninth aspect is the digital AV content migration system according to the first aspect, wherein the source recording medium and the destination recording medium are randomly accessible recording media.

  A digital AV content migration system according to a tenth aspect of the invention is the digital AV content migration system according to the first aspect of the invention, wherein the destination control unit includes retry means for repeating the recording operation when block recording fails.

  The digital AV content moving system according to an eleventh aspect is the digital AV content moving system according to the tenth aspect, wherein the retry means has a retry limit for terminating the retry operation after repeating the retry operation a predetermined number of times.

  A digital AV content moving system according to a twelfth aspect of the invention is the digital AV content moving system according to the first, second, third, fourth, fifth, sixth, seventh or eighth aspect of the invention, wherein the movement source control unit moves the digital AV content. Is started, a destination device limiting means for limiting the destination device of the digital AV content is provided.

  A digital AV content moving system according to a thirteenth aspect is the digital AV content moving system according to the first aspect, wherein the communication bus is a high-speed serial bus conforming to the IEEE 1394 standard.

  According to the digital AV content movement system of the present invention, the movement source control unit includes movement information management means for generating and managing movement information related to segments and blocks of the digital AV content recorded on the movement source recording medium. The destination control unit includes recording information notifying means for generating recording information for each segment and notifying the source recording / reproducing device when the received digital AV content to be moved is recorded on the destination recording medium. Since the information management means updates the movement information based on the received recording information and performs the movement operation of the digital AV content while recording the updated movement information on the movement source recording medium, the movement operation of the digital AV content is interrupted. Even if it was detected, the segment that had been moved before the interruption was grasped, and the moving operation of the digital AV content was resumed. It can be reliably resumed from the mobile middle segment.

  As a result, when the movement of the digital AV content is interrupted and resumed during the movement of the digital AV content, a margin as in the prior art is not formed, so that the destination recording / playback device is in the same state as the original digital AV content. A digital AV content moving system capable of moving can be provided.

  In the present invention, in the digital AV content moving system according to the second aspect of the invention, the moving source control unit has failed to record the predetermined segment on the moving destination recording medium based on the recording information notified by the recording information notifying means. If the content operation is interrupted during segment movement, the predetermined unit that has failed to move without being retransmitted from the beginning of the segment is provided. It is possible to retransmit from the block, and it is possible to reduce the processing of the movement operation due to the movement interruption.

  Further, in the present invention, in the digital AV content moving system according to the third aspect of the present invention, the retransmission means provides a retransmission restriction that temporarily stops the retransmission processing of the corresponding block when the predetermined block moving operation has failed a predetermined number of times. This prevents the movement-source recording / playback device from getting out of the operation of continuing to retransmit the same part in the digital AV content.

  In the present invention, in the digital AV content migration system according to the fourth aspect of the invention, the migration source control unit selects one migration method from a plurality of migration methods when transmitting the digital AV content. By providing the means, the communication bus is efficiently used and the digital AV content movement is reliably performed.

  That is, according to the present invention, even when a predetermined communication bus has insufficient bandwidth when moving digital AV content, it is possible to efficiently move digital AV content by selecting an optimal one from a plurality of moving methods. A digital AV content moving system can be provided.

  In the present invention, in the digital AV content moving system according to the fifth aspect of the present invention, the segment is sized to fit within 60 seconds of the actual playback time, and only one of the copyright protection area and the other area is not included. It is preferable to contain.

  Also, in the present invention, in the digital AV content moving system according to the sixth aspect of the present invention, the movement source control unit is based on the recording information notified by the recording information notification means, and includes at least one of the segments of the content protection area. Content that is recorded on the source recording medium even if it is digital AV content in which a content protection area and a non-content area are mixed by providing playback prohibition means that disables playback of the block from the source recording medium By prohibiting reproduction of only the protected area, unauthorized copying of the content protected area is prevented.

  In the present invention, in the digital AV content moving system according to the seventh aspect of the present invention, the segment is preferably composed of one or more blocks.

  In the digital AV content moving system according to the eighth aspect of the present invention, it is preferable that the moving source recording / playback device or the moving destination recording / playback device includes a tuner for receiving a broadcast program.

  In the digital AV content migration system according to the ninth aspect of the present invention, the source recording medium and destination recording medium are randomly accessible recording media, for example, random access such as a hard disk drive or a recordable DVD. A possible recording medium is preferable.

  Further, in the present invention, in the digital AV content moving system of the tenth invention, the movement destination control unit includes retry means for repeating the recording operation when the block recording fails, and in the digital AV content moving system of the eleventh invention, The retry means provides a retry limit that terminates the retry operation when the retry operation is repeated a predetermined number of times, thereby preventing the destination recording / reproducing device from getting out of the repetition of the recording operation.

  According to the present invention, in the digital AV content migration system according to the twelfth aspect of the present invention, when the migration source control unit starts the migration operation of the digital AV content, the migration source device limiting means for limiting the migration destination device of the digital AV content. By providing, even if “interruption → resumption” of the digital AV content moving operation occurs, it is possible to prevent movement to a device other than that designated at the start of movement.

  In the present invention, in the digital AV content moving system according to the thirteenth aspect of the present invention, the communication bus is preferably a high-speed serial bus conforming to the IEEE 1394 standard.

  Hereinafter, a digital AV content moving system according to an embodiment of the present invention will be described with reference to the drawings.

  First, the form of data transfer between nodes in the IEEE 1394 standard will be described with reference to the drawings. Here, the node is a generic term for devices connected to the IEEE 1394 bus. The node is assigned a unique identification number called a node ID every time the IEEE 1394 bus is initialized, and is identified by the node ID. To do.

  The IEEE 1394 standard defines two types of data transfer methods: an isochronous transfer method specialized for transferring real-time stream data such as video and audio data, and an asynchronous transfer method used for normal data transfer. Yes. The transmission data is divided into basic units called packets and sent to the IEEE 1394 bus. FIG. 2 is a basic configuration diagram of a packet in IEEE 1394, and includes a header part, a header CRC part, a data part, and a data CRC part.

  When a packet transmission device (hereinafter referred to as a transmission node) transmits the predetermined packet, first, a predetermined setting is made in the header portion. The predetermined setting differs depending on the isochronous transfer method and the asynchronous transfer method. Next, transmission data is set in the data part. Finally, predetermined values relating to the set values of the header part and the data part are set in the header CRC part and the data CRC part, and are sent to the IEEE 1394 bus. Note that CRC is an error detection method capable of detecting errors in continuous data, and the CRC value calculation method and the data error detection method using the CRC value are not related to the present invention, and thus the details are omitted.

  The isochronous transfer method is a transfer method that guarantees real-time performance by regularly transmitting the packet at a period of 125 microseconds. In the isochronous transfer method, a transmission node divides transmission data into predetermined packets, adds an identification number called an isochronous channel to the packet, and transmits the packet. A packet receiving device (hereinafter referred to as a receiving node) receives the packet by designating the isochronous channel, but does not return a recognition packet (hereinafter referred to as ACK). Confirmation of whether or not it has been received is not performed.

A band required for packet transmission is managed by a node called an isochronous resource manager (hereinafter referred to as IRM). The IEC 61883-1 standard stipulates that the transmission node acquires the necessary bandwidth and isochronous channel to the IRM in advance when transmitting a packet, and transmits after establishing a logical connection, so that the necessary bandwidth and isochronous channel can be secured. If there is no connection or the connection establishment fails, the packet should normally not be sent. Here, detailed embodiments of the necessary bandwidth and isochronous channel acquisition method and the logical connection establishment method are omitted because they are not directly related to the present invention.
On the other hand, the asynchronous transfer method is a transfer method in which asynchronous communication is performed using a free time of a bus. The asynchronous transfer system supports an addressing conforming to the IEEE1212 standard and a Control and Status Register (hereinafter referred to as CSR) architecture. In the asynchronous transfer system, a register standardized by the CSR architecture and a receiving node are designated and transmitted in the header part.

  In the asynchronous transfer method, two types of transactions are defined. The first transaction is called a unified transaction, and performs transaction processing within a request subaction period. The second transaction is called a split transaction, in which transaction processing is divided into two subactions. The subaction indicates a packet transfer process.

  Here, the unified transaction will be described with reference to FIGS. 3 and 5. FIG. FIG. 3 is a diagram showing a sequence of the unified transaction. In FIG. 3, 130 is a transmission node, 131 is a reception node, 132 is a request packet sent from the transmission node 130, 133 is an ACK for the packet 132, 134 is a request subaction period in which the request packet 132 is transmitted. Each is shown. In FIG. 5, 150 is a list of ACK names and ACK codes that are unique ACK identification values.

  In the unified transaction, a series of processing from step S1 to step S4 is performed during the request subaction period 134 as shown in FIG.

  In step S <b> 1, the transmission node 130 transmits a request packet 132 to the reception node 131.

  In step S <b> 2, the receiving node 131 receives the request packet 132 transmitted from the transmitting node 130.

  In step S 3, the receiving node 131 returns ACK 133 to the transmitting node 130.

  In step S4, the sending node 130 receives the ACK 133 and completes the transaction. In step S4, if ACK 133 is ack_complete, the transaction is successful; otherwise, the transaction is unsuccessful (in the unified transaction, ack_pending is not returned). If the transaction fails, the process is repeated from step S1.

  Next, the split transaction will be described with reference to FIGS. 4, 5, and 6. FIG.

  FIG. 4 is a diagram showing the steps of the split transaction. In FIG. 4, reference numerals 140 to 144 are the same as 130 to 133 in FIG. Reference numeral 145 denotes a response packet to the request packet 142, 146 denotes an ACK from the transmission node 140 that has received the response packet 145, and 147 denotes a response subaction period that is a response packet 145 transmission process.

  The same applies to the ACK name / ACK code list 150 in FIG.

  In FIG. 6, reference numeral 151 denotes a response name / rcode list indicating the correspondence between response names and rcode types.

  In the split transaction, a series of processing from step S11 to step S14 is performed during the request subaction period 144 as shown in FIG. Here, the processing from step S11 to step S14 in FIG. 4 is the same as the processing from step S1 to step S4 in FIG. In step S14, if ACK 143 is ack_pending, a response subaction period 147 occurs. In the response subaction period 147, steps S15 to S18 in FIG. 4 are performed.

  In step S <b> 15, the reception node 141 transmits a response packet 145 to the transmission node 140. The response packet 145 includes a response code indicating the result of the response packet 145 called rcode.

  In step S <b> 16, the transmission node 140 receives the response packet 145 transmitted from the reception node 141.

  In step S17, the transmission node 140 returns an ACK 146 to the reception node 141.

  In step S18, the receiving node 141 receives the ACK 146 and completes the transaction. In step S18, if the response packet 145 is resp_complete and the ACK 146 is ack_complete, the transaction is successful. Otherwise, the transaction is failed. If the transaction fails, the process is repeated from step S11.

As described above, in the asynchronous transfer method, the above two transactions are properly used depending on the case, and an ACK is always returned for the request or response packet, thereby determining the success / failure of the transaction and improving the reliability of the data transfer. Guaranteed (guaranteed).
(Embodiment 1)
Next, the present embodiment will be described with reference to the drawings.

  FIG. 1 is a device connection configuration diagram of recording / playback devices having a function of moving digital AV content according to the first embodiment.

  In FIG. 1, the source HDD recorder A1 (assuming that “GUID = 12341394: 000000A1” in the present embodiment) and the destination HDD recorder A2 (“GUID = 12341394: in this embodiment”). 000000A2 ″) are connected to each other by the IEEE1394 bus 200.

  The migration source HDD recorder A1 is a migration source control for controlling the migration source HDD 201, the migration source IEEE 1394 interface 202, and the migration source HDD recorder A1 for communicating with a device conforming to the IEEE 1394 standard, in which digital AV content is recorded. The unit 203 includes a transmission RAM 204 which is a memory for temporarily storing predetermined data (source memory element).

  The destination HDD recorder A2 also includes a destination HDD 301 that can be randomly accessed for recording digital AV content, a destination IEEE 1394 interface 302 for communicating with an IEEE 1394 standard-compliant device, and a destination that controls the destination HDD recorder A2. The control unit 303 includes a reception RAM 304 which is a memory for temporarily storing predetermined data (destination storage element).

  The control unit 203 inquires the size of the reception RAM 304 that can be received and processed at one time of the destination HDD recorder A2 (hereinafter referred to as the allowable size), and the first divided data having a predetermined size from the digital AV content. (Hereinafter referred to as a segment), and is recorded in the HDD 201 and the dividing means 208 that forms second divided data (hereinafter referred to as a block) having a predetermined size that does not exceed the size of the reception RAM 304 from the segment. Based on digital AV content to be moved (hereinafter referred to as “moved digital AV content”) and segments and blocks generated from the moved digital AV content, movement information management means 205 for generating and managing movement information, and a destination HDD 301 Retransmission means 20 for retransmitting only blocks that have failed to be recorded on Reading means 209 for reading the digital AV content recorded in the migration source HDD 201, encryption means 210 for encrypting the digital AV content read by the reading means 209, and predetermined transmission data via the destination IEEE 1394 interface 202, IEEE 1394 Transmission means 211 for transmitting to the bus 200, movement destination device restriction means 212 for restricting movement destination devices of digital AV content, movement method selection means 213 for selecting one movement method from a plurality of movement methods, moved content And reproduction prohibiting means 214 for prohibiting reproduction of the protected area block from the migration source HDD 201.

  The control unit 303 includes a receiving unit 309 that receives predetermined data from the IEEE 1394 bus 200 via the destination IEEE 1394 interface 302, a decrypting unit 305 that decrypts the encrypted digital AV content received by the receiving unit 309, and a decrypting unit. The recording means 306 for recording the digital AV content decrypted by 305 or the unencrypted digital AV content received by the receiving means 309 in the destination HDD 301, and performing a recording operation a predetermined number of times when recording to the destination HDD 301 fails. Recording information indicating that the write retry of the segment constituted by a predetermined block has reached a predetermined number of times by the retry means 307 and the retry means 307 or that the recording to the destination HDD 301 has been successfully performed is the destination IEEE1. Having a recorded information notifying means 308 notifies the migration source HDD recorder A1 through 94 interface 302.

  In FIG. 7, reference numeral 408 denotes a list of values relating to a moving method used when moving the target digital AV content. In this embodiment, the isochronous transfer method is defined as “0”, and the asynchronous transfer method is defined as “1”.

  In FIG. 8, reference numeral 404 denotes a status list indicating values of movement states for each segment and each block formed from the target digital AV content. In the present embodiment, it is defined as “0” if the movement has not been completed and “1” if the movement has been completed.

  In FIG. 9, reference numeral 405 denotes a data structure of block identification information for block identification formed from the target digital AV content. “Block ID” stores a unique value for block identification. In the “block status”, any value of the movement state defined in the status list 404 is stored. The “block size” stores the size of the corresponding block.

  In FIG. 10, reference numeral 403 denotes a data structure of segment identification information for segment identification formed from the target digital AV content. “Segment ID” stores a unique value for segment identification. In “CCI”, the CCI (Copy Control Information) of the corresponding segment is stored. “Segment status” stores any value of the movement state defined in the status list 404. The “segment offset” stores the start position of the corresponding segment. The “segment size” stores the segment size of the corresponding segment. The “number of untransmitted blocks” stores the number of untransmitted blocks forming the corresponding segment. The “block identification information list” stores values relating to block identification information of blocks forming the corresponding segment.

  In FIG. 11, reference numeral 402 denotes a data structure of movement information generated by the movement source control unit 203 of the movement source HDD recorder A <b> 1 using the movement information management unit 205. The “target content ID” stores the content ID of the target digital AV content. The “destination device GUID” stores the GUID of the destination HDD recorder A2. “Allowable size of destination device” stores the allowable size of the destination HDD recorder A2. One of the values defined by the movement method 408 is stored in the “movement method”. The “number of untransmitted segments” stores the number of untransmitted segments forming the target digital AV content. The “segment identification information list” stores the start segment ID and end segment ID of the segment forming the target digital AV content.

  Here, the process of moving the digital AV content from the source HDD recorder A1 to the destination HDD recorder A2 will be described with reference to the drawings.

  FIG. 12 is a diagram showing a process of moving digital AV content (from step S200 to step S211) from the source HDD recorder A1 to the destination HDD recorder A2.

  In FIG. 13, reference numeral 160 denotes a movement list in which the content ID of the digital AV content being moved is stored. It is assumed that the migration list 160 is generated in the migration source HDD 201, and the size of the migration list 160 is variable depending on the number of digital AV contents being moved. The content ID is a unique value assigned to the digital AV content recorded in the migration source HDD 201.

  In FIG. 14, reference numeral 500 denotes digital AV content having a content ID = “1234”, a playback time of 200 seconds including a portion of CCI = “1” and CCI = “0”, and an overall size of 400 Mbytes. Reference numeral 501 denotes a first form in which segments are formed from the digital AV content 500 by the dividing unit 208. Reference numeral 502 denotes a segment with segment ID = “0” in the first form 501. Reference numeral 503 denotes a second form in which a block is formed from the segment 502. Reference numeral 504 denotes a block with block ID = “2” in the second form 503. Reference numeral 505 denotes a block with block ID = “3” in the second form 503. Reference numeral 506 denotes a block with block ID = “4” in the second form 503.

  When the moving digital AV content (assuming that it is digital AV content 500 in the present embodiment) and the movement target device (assuming that it is the movement destination HDD recorder A2 in this embodiment) are determined by an operation from the user. The process proceeds to step S200.

  In step S200, it is confirmed whether or not the content ID of the digital AV content 500 exists in the movement list 160. If the content ID does not exist (NO in step S200), it is determined that a new movement is started, and the process proceeds to step S201. If the content ID exists (YES in step S200), it is determined that the movement is resumed, and the process proceeds to step S205.

  In step S201, the movement source control unit 203 adds the content ID = "1234" of the digital AV content 500 to the movement list 160, and proceeds to step S202. A state in which the content ID of the digital AV content 500 is added to the movement list 160 is 161 in FIG.

  In step S202, the movement source control unit 203 forms a segment and a block from the digital AV content 500, and proceeds to step S203. Details of step S202 will be described later.

  In step S203, the source control unit 203 generates segment identification information and block identification information from the segment and block of the digital AV content 500 formed in step S202, and proceeds to step S204. Details of the processing in step S203 will be described later.

  In step S204, the movement source control unit 203 generates movement information of the digital AV content 500 from the segment identification information and block identification information generated in step S203, and proceeds to step S205. Details of the processing in step S204 will be described later.

  In step S205, the movement source control unit 203 performs division movement processing for moving the digital AV content 500 in units of blocks for each segment. Details of the processing in step S205 will be described later.

  In step S206, the movement source control unit 203 confirms whether the divided movement of the digital AV content 500 has been successful, and if the divided movement has failed (NO in step S206), the movement process ends in failure (step S207). If the divided movement is successful (YES in step S206), the process proceeds to step S208.

  In step S <b> 208, the source control unit 203 confirms whether the content protection target part is included in the digital AV content 500. If the content protection target portion is included (YES in step S208), the movement source control unit 203 uses the reproduction prohibiting means 214 to move the content protection portion in the digital AV content 500 from the movement source HDD 201, that is, CCI (Copy Control Information). = "1" is deleted, and the process proceeds to step S210. If the content protection target part is not included, that is, if CCI = “0” (NO in step S208), the process proceeds to step S210 as it is.

  Here, the CCI is information for content copy control, and the CCI in the digital AV content once recorded on the recording medium is either “Copy Free (= 0)” or “No More Copies (= 1)”. Including one or both.

  In step S210, the movement information of the digital AV content 500 is deleted from the movement source HDD 201, and the process proceeds to step S211.

  In step S211, the digital AV content 500 content ID = “1234” is deleted from the movement list 161. 160 is the movement list in the deleted state.

  Also, in each step S200 to step S211, if the IEEE 1394 bus 200 is disconnected or the power to the destination HDD recorder A2 is cut off, the movement of the digital AV content 500 is immediately interrupted, and a restart request is made by an operation from the user. If there is, the process is started again from step S200. At this time, the migration source 161 in which the content ID = “1234” of the suspended digital AV content 500 is registered and the migration information of the digital AV content 500 remain in the migration source HDD 201. Since the movement of the AV content 500 is resumed, the movement can be resumed without losing the digital AV content.

  The digital AV content movement process is thus completed.

  Here, the dividing process of forming a segment from the digital AV content 500 in step S202 and further forming a block from the segment will be described with reference to the drawings.

  In FIG. 16, reference numeral 400 denotes an inquiry command (ctype = “0”, opcode = “0”, operand [0] = inquiry for the migration source HDD recorder A1 to query the allowable size of the migration destination HDD recorder A2 with a packet conforming to the IEEE 1394 standard. "0x12").

  In FIG. 17, reference numeral 401 denotes an inquiry response (opcode = “0”, operand [0] = ”) in which the migration destination HDD recorder A 2 notifies the migration source HDD recorder A 1 of the allowable size with a packet conforming to the IEEE 1394 standard, similarly to the migration source HDD recorder A 1. 0x12 ″, limit_size = allowable size of destination HDD recorder A2.

  FIG. 18 shows the procedure of the dividing process in step S202 (steps S300 to S303).

  In FIG. 18, in step S <b> 300, the movement source control unit 203 uses the movement information management unit 205 to check whether movement information of the digital AV content 500 has been generated. If movement information has been generated (YES in step S300), it is determined that the movement of the digital AV content 500 has been resumed, and the division process ends. If the movement information has not been generated (NO in step S300), it is determined that a new movement process for the digital AV content 500 is started, and the process proceeds to step S301.

  In step S301, the source control unit 203 transmits an inquiry command 400 that inquires about the allowable size of the destination HDD recorder A2 using the inquiry means 207. In the present embodiment, the allowable size of the destination HDD recorder A2 is determined to be 40 Mbytes.

  After receiving the inquiry command in the destination HDD recorder A2, the destination control unit 303 sets “40960” (unit: K bytes), which is an allowable size, to limit_size of the inquiry response 401 for the inquiry command 400 (411 in FIG. 19). To the source HDD recorder A1.

  In the migration source HDD recorder A1, the migration source control unit 203 again sets “40960” (unit: K bytes), which is the allowable size set in the limit_size of the inquiry response 411, to the “movement destination device allowable size” of the movement information 402. Store.

  Step S301 is ended above and it moves to step S302.

  In step S302, a segment is formed from the digital AV content 500.

  The segment formation will be described with reference to the drawings. In FIG. 14, the source control unit 203 uses the dividing unit 208 so that the digital AV content 500 has either CCI “1” or “0” and one segment is within 60 seconds. (In the case of the digital AV content 500, if segmentation is performed under this condition, five segments are formed).

  Next, segment IDs “0”, “1”, “2”, “3”, and “4” are assigned in order from the first segment (first form 501 in FIG. 14). Then, step S302 is finished and the process proceeds to step S303.

  In step S303, a block is formed from each segment formed in step S302.

  Block formation will be described with reference to FIG. In FIG. 14, the movement source control unit 203 uses the dividing unit 208 to form blocks 504, 505, and 506 so that the size of the segment 502 is less than or equal to “40960” (unit is K bytes). Then, block IDs “2”, “3”, and “4” are assigned to the blocks 504, 505, and 506, respectively. (Second form 503 in FIG. 14). Blocks are similarly formed for the other segments.

  Then, step S302 is finished.

  This is the end of the description of the dividing process in step S202.

  Here, the identification information generation processing for generating the segment identification information and the block identification information in step S203 will be described with reference to the drawings.

  FIG. 20 shows the identification information generation process (steps S310 to S311) in step S203.

  In step S310, the movement source control unit 203 generates block identification information of the block 504 formed in step S302 using the dividing unit 208 (the identification information has a data structure shown in 405 (FIG. 9)). In the block identification information, “2” which is the block ID of the block 504 is stored in “block ID”, “0” indicating incomplete movement is stored in “block status”, and the block size is the block size of block 504 ”. 40960 "(unit: K bytes) is stored, and the block identification information generation for the block 504 is finished. The same applies to block 505 and block 506. In FIG. 21, 520, 521, and 522 are block identification information generated from the block 504, the block 505, and the block 505, respectively.

  Above, step S310 is complete | finished and it moves to step S311.

  In step S311, the source control unit 203 uses the dividing unit 208 to generate segment identification information of the segment 502 formed in step S302 (the segment identification information takes the data structure shown in 403 (FIG. 10)). In the segment identification information, “0” that is the segment ID of the segment 502 is stored in “Segment ID”, “1” that is the CCI value of the segment 502 is stored in “CCI”, and the segment movement is incomplete in “Segment status” “0” is stored, “0” that is the segment offset value of the segment 502 is stored in “Segment offset”, and “102400” (the unit is K bytes) that is the segment size of the segment 502 is stored in “Segment size”. Store “3” which is the number of blocks forming the segment 502 in the “number of untransmitted blocks”, and “2” which is the first block ID of the block which forms the segment 502 in the “block identification information list” and the end Stores the block ID “4” and the segment related to the segment 502 Ending the generation of different information. In FIG. 21, reference numeral 523 denotes segment identification information of the segment 502. The same applies to the other segments forming the digital AV content 500.

  Step S311 is complete | finished above.

  This is the end of the description of the identification information generation process in step S203.

  Here, the movement information generation processing in step S204 will be described with reference to the drawings.

  In step S204, movement information of the digital AV content 500 is generated from the block identification information and segment identification information generated in step S203.

  The movement source control unit 203 uses the movement information management unit 205 to generate movement information based on the block identification information and segment identification information generated in step S203 (the movement information has a data structure shown in 402 (FIG. 11)). ). In the movement information, “1234” that is the content ID of the digital AV content 500 is stored in “target content ID”, and “12341394: 000000A2” that is the GUID of the movement destination HDD recorder A2 is stored in “movement destination device GUID”. “1” indicating the isochronous transfer method is stored in “Movement method”, the allowable size “40960” (unit is K bytes) of the movement destination HDD recorder A2 is stored in “Movement destination device allowable size”, and “Unsent segment” “5” which is the number of segments forming the digital AV content 500 is stored in “Number”, and “0” which is the first segment ID of the segment forming the digital AV content 500 and the end segment ID are stored in the “segment identification information list”. A certain “4” is stored and the digital AV content 500 is stored. Ending the generation of the movement information that. In FIG. 21, 524 is movement information of the digital AV content 500.

  This is the end of the description of the movement information generation process in step S204.

  Here, the division movement process of moving the digital AV content in step S205 in units of blocks will be described with reference to the drawings.

  In FIG. 22, reference numeral 406 denotes a segment transmission start command for starting transmission of the target segment. In FIG. 23, reference numeral 407 denotes a segment transmission start response to the segment transmission start command 406. In FIG. 24, reference numeral 409 denotes a recording information inquiry command for inquiring recording information including information of a block whose recording has failed in the destination HDD 301. In FIG. 25, reference numeral 410 denotes a recording information inquiry command response, which is a recording information inquiry response including recording information.

  FIG. 26 shows the procedure of the split movement process in step S205.

  The movement information at the time of starting the divided movement process in step S205 is 524, the segment identification information is 523, and the block identification information is 520, 521, and 522.

  In step S400, first, the “number of untransmitted segments” of the movement information 524 is set in a variable seg_num (variable for counting the number of untransmitted segments), and the process proceeds to step S401.

  In step S401, a first loop process is started in which the processes up to step S412 are repeated for the number of seg_num times set in step S400.

  Here, the first loop process will be described.

  In step S402, the segment ID of the first segment described in the “segment identification information list” of the movement information is set in the variable index (segment ID management variable), and the process proceeds to step S403.

  In step S403, the “segment status” of the segment identification information whose segment ID is index is checked. If “segment status” is “1” (YES in step S403), the index is incremented (step S404), and the process returns to step S403. If not (NO in step S403), “0” is set to variable retry (a variable for managing the number of retransmissions) (step S405), and the process proceeds to step S406.

  In step S 406, a segment movement process with a segment ID of “index” is performed, and the movement information, segment identification information, and block identification information are updated and stored in the movement source HDD 201. Details of step S406 will be described later. When the process of step S406 ends, the process proceeds to step S407.

  In step S407, the “number of untransmitted blocks” of the segment identification information whose segment ID is the variable index is confirmed.

  When the “number of untransmitted blocks” is not “0”, if transmission of a block constituting a segment with segment ID = index has failed (NO in step S407), the process proceeds to a retransmission process in S408.

  In step S408, the variable retry is confirmed, and if the variable retry is less than “3” (YES in step S408), the variable retry is incremented (S409), and the process returns to step S406 to perform retransmission processing (in this case, in step S406, move Based on the information, the segment identification information, and the block identification information, a process of retransmitting a block that has failed to be transmitted, that is, a block whose block identification information “block status” is “0”) If not, the retransmission process is terminated and the process proceeds to step S412. In this embodiment, the comparison operation of the variable retry is “3” (the segment retransmission process is up to three times), but may be defined according to the specification.

  Again in step S407, if the “number of untransmitted blocks” is “0”, that is, if transmission of all the blocks constituting the segment whose segment ID is index is successful (YES in step S407), the transmission of the segment is completed. To show, “1” is set in “segment status” of the segment identification information whose segment ID is index (step S410), the “number of untransmitted segments” of the movement information is decremented, and the variable seg_num is decremented (step S411). , Go to S412.

  In S412, preparation is made to check the next segment by incrementing the variable index.

  The processes from S401 to S412 are repeated, transmission of all segments constituting the digital AV content is completed, and the process proceeds to step S413.

  In step S413, it is confirmed whether the “number of untransmitted segments” of the movement information is “0”. If the “number of untransmitted segments” is “0”, that is, if the movement of all the segments has been completed, the divided movement process is successful. If the “number of untransmitted segments” is not “0”, that is, if the movement of all segments has not been completed, the division movement fails.

  Next, the segment movement process in step S406 will be described with reference to the drawings.

  FIG. 27 is a diagram showing the segment movement process (steps S450 to S469) in step S406.

  In step S450, "0" is set to the variable count for block count, and the process proceeds to step S451.

  In step S451, a segment transmission start command for notifying the destination HDD recorder A2 of segment transmission (ctype = “0”, opcode = “0”, operand [0] = “0x13”, seg_id = transmission target segment Segment ID, seg_ofs = offset of transmission target segment, seg_size = segment size of transmission target segment, blk_id [n] = block ID of transmission block (n is variable)), start segment transmission from destination HDD recorder A2 A response (opcode = “0”, operand [0] = “0x13”) is received, and the process proceeds to step S452. 406 in FIG. 22 is the format of the segment transmission start command. Also, reference numeral 407 in FIG. 23 denotes a segment transmission start response format.

  In steps S452 to S459, the second loop processing is performed in which block transfer is performed for the number of blocks constituting the segment, that is, for the number set in the “number of untransmitted blocks” of the segment identification information.

  In step S453, the movement source control unit 203 reads the block from the movement source HDD 201 using the reading unit 209, writes the block in the transmission RAM 204, and proceeds to step S454.

  In step S454, it is determined whether or not “CCI” of the segment identification information is “0”. If “CCI” is not “0” (NO in step S454), the encryption unit 210 uses the predetermined encryption method on the transmission RAM 204. Are encrypted (step S455), and the process proceeds to step S456. If “CCI” is “0” (YES in step S454), the block on transmission RAM 204 is not encrypted, and the process proceeds to step S456.

  In step S456, the “movement method” of the movement information is determined. If “movement method” is “0” (YES in step S456), the block on the transmission RAM 204 is transmitted to the destination HDD recorder A2 by the isochronous transfer method. (Step S458) The process moves to step S459. Otherwise (NO in step S456), the block on the transmission RAM 204 is transmitted to the destination HDD recorder A2 by the asynchronous transfer method (step S457), and the process proceeds to step S459. The movement method is as described with reference to FIGS.

  In step S459, the variable count is incremented to prepare for transmission of the next block. By repeating steps S452 to S459 as described above, all the blocks constituting the predetermined segment are transmitted, and the process proceeds to step 460.

  Here, the destination HDD recorder A 2 that has received all the blocks constituting the segment receives the packetized transmission block from the destination IEEE 1394 interface 302 to the reception RAM 304 using the receiving means 309. The destination control unit 303 confirms the CCI of the received block in the reception RAM 304 and, if the CCI is not “0”, that is, “Copy Freely”, the destination control unit 303 uses the decoding unit 305 to perform decoding using a predetermined decoding method and uses the recording unit 306. To the destination HDD 301. Otherwise, the recording unit 306 is used as it is to record in the destination HDD 301. If there is a block that has failed to be recorded in the destination HDD 301, the destination control unit 303 uses the retry unit 307 to perform re-recording a predetermined number of times. If the number of times of re-recording exceeds a predetermined number of times, it is assumed that recording has failed, and recording of the target block is interrupted. If there is a restart request due to a user operation or the like, the process restarts from the split movement process in step S205.

  In step S460, a record information inquiry command (ctype = "0", opcode = "0", operand [0] = "0x14") is transmitted to the destination HDD recorder A2, and the record information inquiry from the destination HDD recorder A2 is transmitted. A response (opcode = “0”, operand [0] = “0x14”, blk_id [m] = block ID where recording failed (m is variable)) is received, recording information is generated, and the process proceeds to step S461.

  In step S461, “0” is set to the variable count for block count, and the process proceeds to step S462.

  In steps S462 to S467, when the segment is a protection target, a block that has been successfully moved in the second loop processing among the blocks constituting the segment (in step S460, the recording information is transferred to the destination HDD 301). The block ID of the block that failed to be recorded is written, that is, the block ID not recorded in the recording information becomes the ID of the block that has been successfully recorded in the destination HDD 301. This is the third loop process.

  In step S463, it is determined whether the block ID of the corresponding block is recorded in the recording information. If not recorded (NO in step S463), the process proceeds to step S464. If it is recorded (YES in step S463), the process proceeds to step S467.

  In step S464, “block status” of the block identification information of the corresponding block is set to “1” indicating movement completion, and the process proceeds to step S465.

  In step S465, “CCI” of the segment identification information of the segment including the block is determined. If “CCI” is not “0” (NO in step S465), the reproduction prohibiting unit 214 prohibits reproduction of the corresponding block (step S466), and the process proceeds to step S467. If “CCI” is “0” (YES in step S465), since the corresponding block is “CopyFreely”, the process proceeds to step S467.

  In step S467, the variable count is incremented to prepare for the reproduction prohibition process for the next block.

  When the second loop process and the third loop process are finished, the process proceeds to the next step S468.

  In step S468, the result of subtracting the number of successfully moved blocks from the value of the “number of untransmitted blocks” in the current segment identification information is written in the “number of untransmitted blocks” in the segment identification information, and the flow proceeds to step S469.

  In step S469, the current movement information, segment identification information, and block identification information are updated and stored in the movement source HDD 201, and the segment movement process is completed.

  This is the end of the description of the segment movement process in step S406.

  Here, the retransmission process will be described based on the success example and the failure example of the split movement process in step S205 using the digital AV content 500.

  In step S400, the movement information of the digital AV content 500 is 524, the segment identification information of the segment 502 is 523, the block identification information of the block 504 is 520, the block identification information of the block 505 is 521, the block identification information of the block 506 is 522, The variable seg_num = “5”.

  In step S401, the condition is satisfied because the variable seg_num = “5”, and the first loop processing is started.

  In step S402, the variable index = “0”.

  In step S403, NO is selected because “segment status” = “0” in the segment identification information 523, and the process proceeds to step S405.

  In step S405, variable retry = “0”.

  In step S406, the segment 502 is transmitted. Here, it is assumed that a bus reset occurs during transmission of the block 506 with the block ID = “4” and the bus bandwidth cannot be obtained when the bus reset is completed. The movement source control unit 203 uses the movement method selection unit 213 to select the asynchronous transfer method, sets the “movement method” of the movement information 524 to “1”, and uses the movement destination device restriction unit 212 to set the “movement destination” of the movement information 524. A device of “device GUID” = “12341394: 000000A2” is searched from the IEEE1394 bus 200. Subsequently, it is assumed that transmission of the block 506 is resumed and transmission of the block 506 fails.

  When step S406 is completed and the process proceeds to step S407, the block identification information 520 is in 525 shown in FIG. 28, the block identification information 521 is in 526 shown in FIG. 28, and the block identification information 522 is in 527 shown in FIG. The identification information 523 is updated to 528 shown in FIG. 28, and the movement information 524 is updated to 529 shown in FIG. In step S407, NO is selected because “number of untransmitted blocks” = “1” in the segment identification information 528, and the process proceeds to step S408.

  In step S408, since variable retry = "0", YES is selected and the process proceeds to step S409.

  In step S409, the variable retry is incremented and the variable retry = “1” is set, and the process returns to step S406.

  The processing so far is referred to as sequence 1.

  Hereinafter, the transmission failure example and the success example will be described separately.

  First, an example of transmission failure will be described.

  In step S406, the segment 502 is transmitted. If transmission of the block 506 with the block ID = “4” fails, NO is selected again in step S407, YES is selected again in step S408, the variable retry is incremented in step S409, and the variable retry = “2”. The process returns to step S406. In this example, it is assumed that this process is repeated until the variable retry = “3”.

  In step S408, NO is selected because the variable retry = “3”, and the process proceeds to step S412.

  In step S412, the index is incremented and index = “1”, the transmission process of the segment 502 is finished, the process returns to step S401 again, and the next segment movement process is started. In the subsequent segment transmission, it is assumed that no transmission failure has occurred, and the process proceeds to step S413.

  In step S413, since the “number of untransmitted segments” of the movement information 529 is “1”, NO is selected and the divided movement process fails. This is the end of the failure example.

  Next, a successful example will be described. In the state after the sequence 1, the segment 502 is transmitted in step S406. Here, it is assumed that the transmission of the block 506 having the block ID = “4” is successful. At this time, in step S406, the block identification information 527 is updated to 530 shown in FIG. 29, the segment identification information 528 is updated to 531 shown in FIG. 29, and the movement information 529 is updated to 532 shown in FIG.

  In step S407, since “the number of untransmitted blocks” of the segment identification information 531 is “0”, YES is selected and the process proceeds to step S410.

  In step S410, the “segment status” of the segment identification information 531 is updated to “1” and stored in the migration source HDD 201, and the process proceeds to step S411.

  In step S411, the “number of untransmitted segments” of the movement information 529 is decremented, updated to “4”, stored in the movement source HDD 201, and the process proceeds to step S412.

  In step S412, the variable index is incremented to become index = “1”, the transmission process of the segment 502 is finished, the process returns to step S401 again, and the next segment movement process is started. It is assumed that no transmission failure has occurred in subsequent segment transmissions, and the process proceeds to step S413.

  In step S413, since the “number of untransmitted segments” of the movement information 529 is “0”, NO is selected and the divided movement process is successful. This completes the successful example.

  This is the end of the description of the digital AV content transfer process.

  As described above, according to the present embodiment, even if the movement operation is interrupted due to some accident during the movement operation of the digital AV content, the movement information, movement information, By referring to the segment identification information, the block identification information, and the movement list, the movement operation of the target digital AV content can be restarted from the state immediately before the interruption, and the loss of the target digital AV content can be prevented. it can.

  Further, according to the present embodiment, even if the movement of a part of the digital AV content has failed, the part that has failed to move by referring to the updated movement information, segment identification information, and block identification information. Only the data can be retransmitted, and the data transfer amount associated with the digital AV content retransmission process can be reduced.

  Further, according to the present embodiment, by providing a movement method selection means for selecting an optimum movement method from a plurality of movement methods, even when the isochronous bandwidth is small, switching to the movement processing by the asynchronous transfer method is performed. Thus, the communication bus can be used efficiently.

  Further, according to the present embodiment, even in the movement operation of digital AV content including a content protection target portion and a portion that is not a content protection target portion, by deleting only the content protection target portion from the source device, the content protection area Unauthorized copying can be prevented.

  In addition, according to the present embodiment, even if the device connection form on the communication bus changes, the destination device limiting means finds out the correct destination device and moves the digital AV content to another device by mistake. It is possible to prevent malfunction and safely resume the moving operation.

  Further, according to the present embodiment, when the segment movement operation fails a predetermined number of times, a retransmission restriction is provided to temporarily stop the retransmission process of the segment, so that the source recording / playback device can retransmit the digital AV content in the movement operation. It is possible to prevent the user from getting out of the operation.

In addition, according to the present embodiment, the moving source is provided with a retry unit that repeats the recording operation when recording of the corresponding block fails, and further, the retry unit is provided with a retry limit that ends the retry operation when the retry operation is repeated a predetermined number of times. This prevents the recording / playback device from getting out of the recording operation.
In this embodiment, as an example for specifying a predetermined command, opcode = 0 and operand [0] = 0x12 are used for an inquiry command and an inquiry response for obtaining the allowable size of the digital AV content destination device. The segment transmission start command and the segment transmission start response use opcode = 0 and operand0 = 0x13, and the record information inquiry command and record information inquiry response are defined as opcode = 0 and operand0 = 0x14. Any value other than those already defined in the AV / C command set standard may be used.

  In this embodiment, the AV / C command set is used for the inquiry command and inquiry response, the segment transmission start command and segment transmission start response, the recording information inquiry command, and the recording information inquiry response. Any other command set may be used.

  In the present embodiment, the source recording medium and the destination recording medium are HDDs. However, any recording medium such as a DVD-RAM, a Blue-ray disc, or an SD card may be used as long as it is a randomly accessible recording medium. It may be.

  In the present embodiment, the encryption / decryption method in the encryption unit and the decryption unit is not specified, but an encryption / decryption method capable of content protection such as DTCP may be used.

  In the present embodiment, the IEEE1394 is described as an example of the communication bus, but the present invention is not limited to this.

  In the present embodiment, each of the source device and the destination device is not equipped with a tuner, but this is not a limitation.

  In the present embodiment, the digital AV content transfer operation from one source device to one destination device has been described. However, digital AV content transfer from a plurality of source devices to one destination device is possible. It may be related to operation.

  The digital AV content moving system according to the present invention is useful as a digital AV content moving system between two or more recording / reproducing apparatuses connected to a high-speed serial communication bus such as IEEE1394.

Configuration diagram of a digital AV content migration system in an embodiment of the present invention Structure diagram of asynchronous packet and isochronous packet Illustration of unified transaction Illustration of split transaction Figure showing ACK code list Figure showing a list of response codes Diagram showing list of movement methods Figure showing segment status / block status list Conceptual diagram showing the block identification information format Conceptual diagram showing the segment identification information format Conceptual diagram showing the movement information format It is a digital AV content movement sequence diagram in an embodiment of the present invention. Conceptual diagram showing a moving list Explanatory drawing which shows the example of digital AV content division | segmentation in embodiment of this invention Conceptual diagram showing a movement list (after adding a content ID of the digital AV content 500) Diagram showing allowable size query command format Diagram showing acceptable size query response format Flow chart of division processing in step S202 Diagram showing allowable size query response format (when limit_size is set) Flowchart of identification information generation processing in step S203 The figure which shows movement information, segment identification information, and block identification information (at the time of completion of step S310) Figure showing segment transmission start command format Figure showing segment transmission start response format Diagram showing record information inquiry command format Diagram showing record information query response format Flow chart of split movement processing in step S205 Step S406 Flow chart of segment movement processing The figure which shows movement information, segment identification information, and block identification information (at the time of step S406 failure) The figure which shows movement information, segment identification information, and block identification information (at the time of step S406 success) Configuration diagram of a conventional digital AV content moving system Conventional state diagram of moving digital AV content

Explanation of symbols

A1 Source HDD recorder A2 Target HDD recorder 200 IEEE 1394 bus 201 Source HDD
202 Source IEEE 1394 interface 203 Source control unit 204 Transmission RAM
205 Movement Information Management Unit 206 Retransmission Unit 207 Query Unit 208 Division Unit 209 Reading Unit 210 Encryption Unit 211 Transmission Unit 212 Destination Device Limiting Unit 213 Movement Type Selection Unit 214 Reproduction Inhibiting Unit 301 Destination HDD
302 Destination IEEE 1394 interface 303 Destination control unit 304 Reception RAM
305 Decoding unit 306 Recording unit 307 Retry unit 308 Record information notification unit 309 Receiving unit

Claims (13)

A digital AV content moving system in which a source recording / playback device and a destination recording / playback device are connected by a predetermined communication bus, and the target digital AV content is moved from the source recording / playback device to the destination recording / playback device Because
The movement source recording / playback device is configured to read and transmit the digital AV content recorded on the movement source recording medium, the movement source storage element, and the movement source recording element to the movement source storage element. A source control unit for controlling the device,
The destination recording / playback device includes a destination recording medium, a destination storage device, and the destination recording / playback device so that the digital AV content received by the destination storage device is read and written to the destination storage medium. And a destination control unit for controlling
The source control unit
Inquiry means for inquiring about the size of the destination storage element capable of receiving and processing the digital AV content at one time by the destination recording / reproducing device;
Dividing means for dividing the digital AV content into a first size to form a segment, and further dividing the segment into a second size not exceeding the size of the destination storage element to form a block;
Movement information management means for generating and managing movement information relating to the segments and blocks of the digital AV content recorded in the movement source recording medium;
Reading means for reading the digital AV content recorded on the source recording medium;
Encryption means for encrypting a content protection portion of the read digital AV content;
Transmission means for transmitting the data of the digital AV content to the communication bus,
The destination control unit
Receiving means for receiving the data from the communication bus;
Decryption means for decrypting the encrypted content protection portion received by the reception means;
Recording means for recording the digital AV content including the content protection part decrypted by the decrypting means on the destination recording medium;
Recording information notifying means for generating recording information for each segment and notifying the source recording / reproducing device when recording the received digital AV content on the destination recording medium,
The movement information management means updates the movement information based on the received recording information and performs a moving operation of the digital AV content while recording the updated movement information on the movement source recording medium. Digital AV content transfer system.   The movement source control unit reproduces only the predetermined block included in the predetermined segment that has failed to be recorded on the movement destination recording medium based on the recording information notified by the recording information notification unit. The digital AV content moving system according to claim 1, further comprising retransmission means for retransmitting to a device.   3. The digital AV content moving system according to claim 2, wherein the resending means provides a resending restriction for temporarily stopping resending processing of the corresponding block when the moving operation of the predetermined block fails a predetermined number of times.   4. The digital AV content movement according to claim 1, 2 or 3, wherein the movement source control unit includes movement method selection means for selecting one movement method from a plurality of movement methods when transmitting the digital AV content. system.   2. The digital AV content moving system according to claim 1, wherein the segment has a size that can be accommodated within 60 seconds of an actual reproduction time and includes only one of a content protection area and an area that is not.   The movement source control unit is configured to prohibit reproduction based on the recording information notified by the recording information notification unit so that the one or more blocks included in the segment of the content protection area cannot be reproduced from the movement source recording medium. The digital AV content moving system according to claim 1, further comprising means.   7. The digital AV content moving system according to claim 1, wherein the segment is constituted by the one or more blocks.   8. The digital AV content moving system according to claim 1, wherein the moving source recording / reproducing device or the moving destination recording / reproducing device includes a tuner for receiving a broadcast program.   The digital AV content moving system according to claim 1, wherein the moving source recording medium and the moving destination recording medium are randomly accessible recording media.   The digital AV content moving system according to claim 1, wherein the destination control unit includes retry means for repeating a recording operation when recording of the block fails.   11. The digital AV content moving system according to claim 10, wherein the retry means is provided with a retry limit for ending the retry operation after repeating the retry operation a predetermined number of times.   The said movement origin control part is provided with the movement destination apparatus limitation means which limits the movement destination apparatus of the said digital AV content, if the movement operation | movement of the said digital AV content is started. 9. The digital AV content moving system according to 7 or 8.   2. The digital AV content moving system according to claim 1, wherein the communication bus is a high-speed serial bus conforming to the IEEE 1394 standard.

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