JP4729635B2 - Digital signal receiving apparatus, digital signal receiving method, and digital signal transmitting / receiving method - Google Patents

Description

  The present invention relates to a broadcast receiving apparatus that receives a broadcast such as a digital broadcast and a stream output apparatus that records and reproduces stream data such as a digital video / audio signal.

  With the development of digital video signal processing technology in recent years, digital AV devices such as set-top boxes (STBs) that receive digital broadcasts, digital VTRs (DVTRs) that record and play back digital broadcast programs, and disk recorders have been commercialized one after another. Has been. In addition, a high-speed serial bus (hereinafter referred to as 1394 bus) defined in the IEEE 1394 standard is the most suitable digital interface for transmitting video and audio signals in the digital signal format between these digital AV devices. Streams and control commands can be transmitted and received simultaneously on the 1394 bus, and the IEC61883 standard and AV / C command set are defined as control and control commands for stream transmission and reception.

  Here, as a technique for preventing unauthorized copying, a DTCP (Digital Transmission Content Protection) system is employed in the 1394 bus. In the DTCP method, copy control information that describes conditions related to copying is assigned to a video / audio stream, and as a result, “copy free” (copy unlimited), “copy never” (copy prohibited), “copy one generation” (copy 1 generation) It is divided into three categories. A recording device such as a digital VTR can receive and record only a “copy free” or “copy one generation” stream. When a “copy one generation” stream is recorded, the copy control information is set to “no more”. "Copy" "(copying is not possible), and recording by other recording devices is prohibited.

  On the other hand, recently, it has become possible to realize a stream recording / reproducing apparatus such as a so-called HDD recorder that records video / audio stream data using a hard disk drive (HDD). In such an HDD recorder, the disk capacity fixed in the apparatus is limited, so that the user can transfer the contents to be stored to a VTR, an optical disk apparatus, etc. when the free disk capacity becomes small. It must be stored in a storage medium such as a tape or an optical disk.

  In view of such a situation, the DTCP system moves a content by copying the content of “no more copies” once recorded on a recording medium to another recording medium, and then deleting or disabling the content. ". The move function can only be performed on one built-in or digitally connected recording medium. During the move operation, both the move source and the move destination can play back content longer than 1 minute at the same time. It is forbidden to be. For example, Patent Document 1 and Patent Document 2 disclose techniques for implementing the move function.

JP 2002-245718 A Japanese Patent Laid-Open No. 2002-238023

  In the above DTCP method, when moving “no more copies” content to another digitally connected stream recording / playback device, it is always specified for only one recording medium. A system that prevents unauthorized copying of content is essential. However, there are various ways to implement the move function, such as when authentication has already been completed with another device before the move starts, or when the move destination device is remotely controlled from another device during the move. Special considerations are required for implementation because of unexpected situations.

  In addition, when the move ends, the original content of the move cannot be deleted or played back. Therefore, if the move fails due to a shortage of recording media or an incorrect operation, the user cannot view the content again.

  It is an object of the present invention to provide a stream data recording / reproducing apparatus having a move function that can be executed as safely and reliably as possible for a user and can be more easily implemented.

In order to solve the above-described problems, an embodiment of the present invention uses, for example, the technical idea described in the claims.

  It is possible to provide a user-friendly digital device while respecting the copyright of the content.

One configuration example of a system according to an embodiment of the present invention One block configuration example of a broadcast receiving apparatus (STB) according to an embodiment of the present invention One block configuration example of a digital VTR (DVTR) according to an embodiment of the present invention 1 is a sequence diagram showing an initial procedure of a move process between a broadcast receiving apparatus and a digital VTR according to an embodiment of the present invention. 1 is a sequence diagram showing a procedure for executing a move process between a broadcast receiving apparatus and a digital VTR according to an embodiment of the present invention. 1 is a sequence diagram illustrating a procedure for interrupting a move process between a broadcast receiving apparatus and a digital VTR according to an embodiment of the present invention. 1 is a sequence diagram showing a move process end procedure between a broadcast receiving apparatus and a digital VTR according to an embodiment of the present invention; Example of a screen displayed when the move process fails in the broadcast receiving apparatus according to the embodiment of the present invention Configuration example of device list for move processing mounted on broadcast receiving apparatus according to embodiment of the present invention

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

  FIG. 1 is an embodiment for explaining the present invention, and shows the configuration of an AV system including a plurality of stream recording / reproducing apparatuses. In the AV system, a broadcast receiving device (STB) 100, a digital VTR (DVTR) 200, and a DVD recorder (DVD) 300 are digitally connected to each other via a 1394 bus 20, and a monitor 30 is connected to the STB 100 in an analog manner. And

  The STB 100 can view the broadcast program received by the antenna 10 on the monitor 30 and can store the broadcast program in a built-in recording memory. Also, digital output of broadcast programs and transmission / reception of control commands can be performed with respect to other DVTRs 200 and DVDs 300 via the 1394 bus 20.

  The DVTR 200 and DVD 300 can record a broadcast program received via the 1394 bus 20 on a removable recording disk.

  Next, one configuration of the STB 100 in FIG. 1 will be described with reference to FIG. The STB 100 includes a tuner processing unit 101, a descrambler 102, a demultiplexer 103, a decoder 104, an input processing unit 105, a timer management unit 106, a recording / playback processing unit 107, a digital I / F 108, a program recording memory 109, a control unit 110, It consists of an analog output terminal 111 and a digital input / output terminal 112.

  The tuner processing unit 101 is a part that selects a desired channel from a plurality of channels received from a broadcasting station and demodulates a digitally modulated program. The descrambler 102 is a part for releasing the scramble of the broadcast program that is set to be able to receive only the channel contracted with the service provider. The demultiplexer 103 is a part that extracts audio data and video data from a broadcast program.

  The decoder 104 is a part that decodes compressed audio data and video data and expands them to the original audio and video signals. These signals can be output to the outside of the monitor 30 or the like via the analog output terminal 111. The input processing unit 105 is a part where the user operates the STB 101 using a remote controller, a touch panel, or the like. The timer management unit 106 manages current time information and timer reservation for broadcast programs. The recording / playback processing unit 107 is a part that performs recording control for recording the received broadcast program in the program recording memory 109 and playback control for playing back the broadcast program recorded in the program recording memory 109.

  The digital I / F 108 is a part that transmits and receives AV streams and control commands to and from other AV devices (for example, DVTR 200 and DVD 300) connected via the 1394 bus 20 via the digital input / output terminal 112. It also encrypts the stream and decrypts the encrypted AV stream. The program recording memory 109 is a memory for recording broadcast programs. A magnetic disk, an optical disk, a memory card, and a hybrid form combining these may be considered. The control unit 110 is a part that comprehensively controls the operation of each unit in the STB 100.

  Similarly, one configuration of the DVTR 200 will be described with reference to FIG. The DVTR 200 includes an input processing unit 201, a digital I / F 202, a timer management unit 203, a recording / playback processing unit 204, a recording memory 205, a control unit 206, a digital input / output terminal 207, and an analog input terminal 208. The input processing unit 201 is a part where the user operates the DVTR 200 using a remote controller, a touch panel, or the like.

  The digital I / F 202 is a part that transmits and receives AV streams and control commands to and from other AV devices (for example, the STB 100 and the DVD 300) connected by the 1394 bus 20 via the digital input / output terminal 207. It also encrypts the stream and decrypts the encrypted AV stream.

  The timer management unit 203 is a part that manages current time information and timer reservation for broadcast programs. The recording / playback processing unit 204 is configured to record a stream received via the digital input / output terminal 207 or the analog input terminal 208 in the recording memory 205, and to play back the stream recorded in the recording memory 205. This is the part that controls playback. The recording memory 205 is a memory for recording a stream, and indicates a magnetic disk in the case of a DVTR. The control unit 206 is a part that comprehensively controls the operation of each unit in the DVTR 200. The DVD 300 has the same configuration as the DVTR 200 except that the recording memory 205 of the DVTR 200 is an optical disk.

  Next, a procedure for moving a broadcast program recorded in the program recording memory 109 of the STB 100 in the AV system shown in FIG. 1 to the recording memory 205 of the DVTR 200 via the 1394 bus 20 will be described below.

  First, a procedure 400 necessary when the STB 100 starts a move process with the DVTR 200 will be described with reference to FIG. When the user instructs move processing via the input processing unit 105 of the STB 100, the control unit 110 activates the move processing program (step 401). Then, the control unit 110 extracts the “no more copies” content stored in the program recording memory 109 and displays it on the monitor 30, and asks the user to select the content to be moved via the input processing unit 105 ( Step 402). Subsequently, the control unit 110 displays all the stream recording devices registered in the STB 100 on the monitor 30, and asks the user to select a destination stream recording device via the input processing unit 105 (here, (DVTR 200) and a device other than DVTR 200 (DVD 300 in this case) are notified to the user by a message display on monitor 30 (step 403). When the user instructs to disconnect the DVD 300 and proceed to the next step, the control unit 110 acquires information on the AV device currently existing on the 1394 bus 20 via the digital I / F 108 (step 404). It is checked whether a device other than the DVTR 200 is currently connected on the 1394 bus 20 (step 405). As a result, if only the DVTR 200 exists, a status acquisition command is issued on the 1394 bus 20 via the digital I / F 108 in order to acquire the current status (step 406). On the other hand, when another device other than the DVTR 200 is connected, the user is warned by a message display or the like on the monitor 30 so that the device other than the DVTR 200 is disconnected again, and the subsequent processing is not allowed to proceed. (Step 407).

  If the state of the DVTR 200 acquired in step 406 is currently stopped, it is necessary between the digital I / F 108 of the STB 100 and the digital I / F 202 of the DVTR 200 in order to send a stream based on the stream transfer protocol of the IEC61883 standard. A new connection is established (step 408). Based on the DTCP method, transmission of a “copy one generation” stream (may be an empty packet) is started on the 1394 bus 20 via the digital I / F 108 (step 409). When receiving the stream, the digital I / F 202 of the DVTR 200 on the receiving side requests the digital I / F 108 of the STB 100 to authenticate, and the STB 100 and the DVTR 200 mutually authenticate each other. If the authentication is successful, the encrypted stream transmitted from the STB 100 can be correctly decrypted by the DVTR 200 (step 410). Then, in order to put the DVTR 200 in a recording pause state, a recording pause command is issued on the 1394 bus 20 (step 411).

  Next, a procedure 500 in which the STB 100 executes a move process with the DVTR 200 will be described with reference to FIG. The control unit 110 of the STB 100 checks whether or not the content to be moved selected in step 402 in FIG. 4 is restricted in analog copy (step 501). If there is no restriction, the content is stored in the program recording memory. The data is temporarily copied to an area that cannot be accessed from the outside on 109 or another memory (step 502). Then, in order to put the DVTR 200 in the recording start state, a recording start command is issued on the 1394 bus 20 (step 503). After confirming that the DVTR 200 has started recording, transmission of the content to be moved as “copy one generation” onto the 1394 bus 20 via the digital I / F 108 is started (step 504).

  After the move execution is started, the control unit 110 of the STB 100 periodically issues a status acquisition command to the DVTR 200 in order to acquire the operating status of the DVTR 200 (step 505). Also, information on the AV device currently existing on the 1394 bus 20 is acquired via the digital I / F 108 (step 506). Then, it is always checked that the DVTR 200 is currently recording and that no device other than the DVTR 200 is currently connected to the 1394 bus 20 (step 507). Further, the transmitted content is periodically deleted or made unplayable (step 508).

  Here, when the capacity of the recording memory 205 set in the DVTR 200 is not halfway, or when the user accidentally operates the DVTR 200 by remote control, the operation state of the DVTR 200 is changed to a state other than recording. Implement (step 509). Details of the interruption process will be described below with reference to FIG.

  When transmission of all contents to be moved is completed (step 510), the STB 100 issues a recording stop command on the 1394 bus 20 (step 511) to stop the recording state of the DVTR 200, and executes a stop process (step 512). ). Details of the end processing will be described below with reference to FIG.

  Here, in step 509, there is a possibility that not only the DVTR 200 but also the user erroneously operates the STB 100 by remote control to stop the content transmission. Therefore, for dubbing processing (Copy Free content) other than move, you can instruct to stop sending content by remote control even during dubbing, but for move processing, you can not instruct to stop sending content by remote control during move execution The method of doing is also mentioned.

  Next, the procedure for interrupting the move process in step 508 will be described with reference to FIG. As described above, when the operation state of the DVTR 200, which is the device to be moved, changes to a state other than recording due to some cause, the STB 100 temporarily stops the transmission of content on the 1394 bus 20 (step 601), and the move process Is notified to the user by displaying a message on the monitor 30 (step 602). When the user performs necessary processing such as setting another recording memory 205 in the DVTR 200 and then instructs the continuation of the move processing via the input processing unit 105 (step 603), the control unit 110 of the STB 100 causes the DVTR 200 to The recording start command is issued again to set the recording state to the recording state (step 604), and the transmission of the content on the 1394 bus 20 is resumed (step 605). In step 602, if the user has not instructed the continuation of the move process or if no instruction has been input from the user for a certain period, the process proceeds to an end process 511.

  Here, even when another device (for example, DVD 300) is connected to the 1394 bus 20 and a bus reset occurs during the move execution, the same processing as the interruption processing 508 is executed. Specifically, when the STB 100 detects the occurrence of a bus reset, the control unit 110 acquires information on the AV device currently existing on the 1394 bus 20 via the digital I / F 108, and only the DVTR 200 is connected. Make sure. When it is found that a device other than the DVTR 200 is connected, the interruption process 508 is performed after a recording pause command is issued to stop the recording state of the DVTR 200.

  Next, a procedure necessary when the STB 100 in step 511 ends the move process for the DVTR 200 will be described with reference to FIG.

  The control unit 110 of the STB 100 confirms that no moved content exists in the program recording memory 109 (step 701). At this time, if there is a part of the content that has been moved, all the content is deleted or cannot be reproduced (step 702).

  Thereafter, the execution result of the move process is confirmed (step 703), and it is checked in step 502 whether there is a copy of the content in an area that cannot be accessed from the outside on the program recording memory 109 or in another memory (step 704). Finally, the user is notified of the execution result of the move process on the monitor 30 (step 706).

  Here, if the move process is successful in step 703, and if there is a copy of the content in step 704, the copy is deleted (step 705), and notification that the move process is successful is sent in step 706. .

  On the other hand, as shown in FIG. 8, if the move process fails due to interruption, the fact that the move process has failed is notified (800), and if there is a copy of the content, an analog output is made via the decoder 104. The terminal 111 is notified that the content can be reproduced. At this time, sending the content onto the 1394 bus 20 via the digital I / F 108 is prohibited. Also, for content that is restricted by analog copy, the content transmitted from the analog output terminal 111 is subjected to processing such as macrovision so that it cannot be recorded on other stream recording devices.

  As described above, it is possible to view the content even when the move process fails, and it is possible to record the content without analog copy restriction on another stream recording device with an analog signal. At this time, there is a method that enables the content to be reproduced under conditions such as down-conversion of image quality for a certain period or a limited number of times.

  An option such as 801 may be presented to the user as a specific screen display thereafter when the move fails.

  In addition, when the move process is interrupted, the content that has already been moved depends on what percentage of the total content (for example, when more than half of the content has already been moved), There is also a method of deleting.

  Further, in the case of an apparatus in which the STB 100 and the monitor 30 of this embodiment are integrated, the content copied to the separate memory is not sent to the outside via the digital I / F 108 and the analog output terminal 111, and the built-in monitor 30 is used. There is also a method that allows playback only on the above.

  Here, the information of the AV apparatus currently existing on the 1394 bus 20 obtained in step 404 of FIG. 4 and step 506 of FIG. 5 and the connected apparatus is only the move destination apparatus in step 405 of FIG. 4 and step 507 of FIG. An example of a method for checking whether or not will be described.

  When a device is connected on the 1394 bus 20, addresses such as node IDs are automatically assigned to the device in ascending order from 0 to 62 so as not to overlap with other devices. The node ID may change as the value assigned every time the connection configuration changes. In asynchronous communication used for a control command or the like, communication is performed using the node ID. On the other hand, ordinary AV devices such as STB 100 and DVTR 200 connected to the 1394 bus 20 have an identifier called a unique unique ID.

  In step 404 and step 506, the node ID existing on the 1394 bus 20 is acquired, and in step 405 and step 507, it is checked that the node ID is only 0 and 1, and then the moving destination apparatus has a recording function. There is a way to confirm that there is. Alternatively, in steps 404 and 506, the unique IDs of all devices existing on the 1394 bus 20 are acquired. In steps 405 and 507, it is checked that the number of acquired unique IDs is 1. There is a method to confirm that the device has a recording function.

  In addition to the above method, the move process is not performed on an unauthorized device having a recording function (for example, a device that has two recording media and can record simultaneously), so that only a specific device is moved. There is a way to do. For example, the moving process target device list 900 as shown in FIG. 9 is installed in the control unit 110 of the STB 100. In the list 900, information that can uniquely specify an AV device to be moved is registered, for example, a manufacturer name or a model name. In step 404 and step 506, the information is acquired from the AV device existing on the 1394 bus 20 together with the node ID and / or the unique ID. In steps 405 and 507, devices other than the move destination device are connected. In addition, it is confirmed that the destination device is a device registered in the move process target list 900. If the move destination device is a device registered in the list, the move process is executed, and if the move destination device is not registered, the move process is interrupted. The contents of the move process target device list 900 are subjected to encryption processing and the like in order to prevent tampering from outside. It is also possible to update the contents of the list 900 using broadcast or Internet download, an IC card, a dedicated terminal, or the like.

  As described above, even if the authentication process with the device other than the move destination has already been completed before the move is executed, the move cannot be executed unless the device is disconnected. Only the move source (STB 100) and the move destination (DVTR 200) exist on the 1394 bus 20, and unauthorized copying by other devices can be easily prevented. In addition, the move destination may perform exactly the same operation as recording normal “copy one generation” content.

  In addition, if the content to be moved is copied to another memory area in advance before the move, and the move process fails, the copied content can only be played back in analog format, and should be able to be moved to the user. Can be left in analog form.

  In this embodiment, the STB 100 is taken as an example of the move source device, but a DVTR 200 or a DVD 300 may be used.

  According to the present invention, the copy-restricted content once recorded by the stream data recording / reproducing apparatus can be transferred to another stream data recording / reproducing apparatus, and an unauthorized copy may be created at that time. There is no. Also, analog playback can be performed only when the transfer of stream data fails due to a lack of recording area or an operation error, and a safe and easy-to-use system can be provided to the user.

10 ... Antenna 30 ... Monitor 100 ... Broadcast receiver 200 ... Digital VTR
300 ... DVD recorder 104 ... decoder 105, 201 ... input processing unit 107, 204 ... recording / reproduction processing unit 108,202 ... digital I / F
109 ... Program recording memory 205 ... Recording tape 110, 206 ... Control unit 111, 208 ... Analog terminal 112, 207 ... Digital terminal

Claims (3)

  In a digital signal receiving apparatus for receiving a digital broadcast signal including a digital compressed video / audio signal accompanied by copy control information,
  Receiving means for receiving the digital broadcast signal;
  Demultiplexer means for extracting the digital compressed video and audio signal from the digital broadcast signal received by the receiving means;
  Recording and reproducing means for recording and reproducing the digital compressed video and audio signal extracted in the demultiplexer means;
  A first output means for outputting the received digital compressed video / audio signal or the digital compressed video / audio signal recorded and reproduced by the recording / reproducing means to another device;
  A received digital compressed video / audio signal, or decoding means for decompressing each of the digital compressed video signal and the digital compressed audio signal of the digital compressed video / audio signal recorded and reproduced by the recording / reproducing means;
  A second output means for outputting the video signal and the audio signal expanded in the decoding means as an analog video signal and an analog audio signal;
  Control means for controlling the recording / reproducing means, the first output means and the second output means;
With
  When the received digital compressed video / audio signal is subjected to a predetermined copy restriction by the copy control information, the control means outputs the digital compressed video / audio signal recorded by the recording / reproducing means from the first output means. Move to other devices, or output the digital compressed video / audio signal recorded by the recording / playback means as an analog video signal and analog audio signal from the second output means in a recordable state by another device age,
  In the move to the other device, the first output means records the digital compressed video / audio recorded when only one device to which the digital compressed video / audio signal is to be recorded is connected to the output destination. A digital signal receiver characterized by outputting a signal.   In a digital signal receiving method in which a digital broadcast signal including a digital compressed video / audio signal accompanied by copy control information is received by a digital signal receiving device,
  Receiving the digital broadcast signal; and
  An extraction step of extracting the digital compressed video / audio signal from the received digital broadcast signal;
  A recording / playback step of recording and playing back the received digital compressed video / audio signal;
  A first output step of outputting the received digital compressed video / audio signal or the recorded and reproduced digital compressed video / audio signal to another device;
  A decompression step of decompressing each of the received digital compressed video and audio signals or the digital compressed video and digital compressed audio signals of the recorded and reproduced digital compressed video and audio signals;
  A second output step of outputting the decompressed video signal and audio signal as an analog video signal and analog audio signal;
  When the received digital compressed video / audio signal is subject to predetermined copy restrictions by the copy control information, the recorded digital compressed video / audio signal is moved to another device, or the recorded digital compressed video / audio signal is analog video Signals and analog audio signals can be output in a state that can be recorded by other devices,
  In the move to the other device, the recorded digital compressed video / audio signal is output when only one device to which the digital compressed video / audio signal is to be recorded is connected to the output destination. Digital signal receiving method.   In a digital signal transmission / reception method in which a digital broadcast signal including a digital compressed video / audio signal accompanied by copy control information is transmitted from a digital signal transmission device and received by the digital signal reception device,
  Transmitting the digital broadcast signal; and
  Receiving the digital broadcast signal; and
  An extraction step of extracting the digital compressed video / audio signal from the received digital broadcast signal;
  A recording / playback step of recording and playing back the received digital compressed video / audio signal;
  A first output step of outputting the received digital compressed video / audio signal or the recorded and reproduced digital compressed video / audio signal as a digital signal to another device;
  A decompression step of decompressing each of the received digital compressed video and audio signals or the digital compressed video and digital compressed audio signals of the recorded and reproduced digital compressed video and audio signals;
  A second output step of outputting the decompressed video signal and audio signal as an analog video signal and analog audio signal;
  When the received digital compressed video / audio signal is subject to predetermined copy restrictions by the copy control information, the recorded digital compressed video / audio signal is moved to another device, or the recorded digital compressed video / audio signal is analog video Signals and analog audio signals can be output in a state that can be recorded by other devices,
  In the move to the other device, the recorded digital compressed video / audio signal is output when only one device to which the digital compressed video / audio signal is to be recorded is connected to the output destination. To send and receive digital signals.

Images