JP2007259437A - Av communication control integrated circuit and av communication control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable AV data processing or copyright protection processing to be performed, according to the class of equipment for mounting an AV communication control integrated circuit therein or for interface use. <P>SOLUTION: An AV communication system comprises a wireless AV transmission apparatus for transmitting AV data wirelessly and a wireless AV receiving apparatus for receiving the AV data from the wireless AV transmission apparatus over a wireless network. Regarding a wireless LAN-LSI 4 inside a wireless AV device, such a wireless LAN-LSI 4 is provided inside the wireless AV transmission apparatus 1 that AV data supplied via a signal line for AV stream are transmitted wirelessly, after performing copyright protection processing thereon and AV data supplied through a general bus are transmitted wirelessly, as they are. Accordingly, even if a wireless AV transmission apparatus 1, including AV leased signal line or a wireless AV transmission apparatus 1, including a general bus, can utilize the same wireless LAN-LSI 4 and it is not necessary to separately develop LSIs, respectively so that reduction in LSI development cost can be attained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an AV communication control integrated circuit and an AV communication control program that transmit or receive AV data while protecting copyright.

  Products called digital information appliances are spreading. These are products that are expected to become more widespread with the start of digital broadcasting, etc., and products that handle digital data and digital content, such as digital broadcasting compatible televisions, set-top boxes, digital VTRs, DVD players, and hard disk recorders. Everything is targeted.

  Digital data and digital content do not deteriorate in quality even if they are copied, and can be copied easily. Therefore, it is necessary to consider measures for copyright protection in advance. For example, IEEE1394, which is a digital network that connects digital AV devices, has an authentication / key exchange mechanism and a data encryption function.

  Here, a case is considered where AV data that requires copyright protection is transferred from a certain transmitting device to the receiving device. It should be noted that the exchange of AV data within the scope of enjoyment by an individual (or an expanded family) is the premise of copyright protection, and the exchange of AV data with a third party ( It should not be done (unless authorized by the owner).

  Data exchange with a third party is performed via a public network such as the Internet, and data exchange between individuals and at home is often performed within a closed home network such as IEEE1394 or a wireless network.

  IEEE1394 is a typical digital network that connects digital AV devices, and has an authentication / key exchange mechanism and a data encryption function. This mechanism is called DTCP (Digital Transmission Content Protection) (see Non-Patent Document 1). Basically, the IEEE1394 LSI has a DTCP encryption and authentication / key exchange mechanism. When transmitting / receiving AV data to be protected via IEEE1394, encryption is performed immediately before transmission to IEEE1394. In many cases, a mechanism for performing decoding immediately after reception is also provided (see Patent Document 1).

  What should be noted in the future is home wireless LAN. The IEEE802.11 standard, which is one of the wireless LAN standards, is rapidly spreading in offices / homes, and it is highly likely that AV data that needs to be protected will be exchanged on the wireless LAN in the future.

  Even in this type of wireless LAN, it is necessary to consider a copyright protection mechanism, which is likely to be incorporated into a wireless LAN LSI based on the IEEE1394 rule of thumb.

  However, until now, wireless LANs have basically been targeted at personal computer (PC) networks. The wireless LAN interface in the PC (interface between the CPU of the PC and the wireless LAN) is performed via a general-purpose bus typified by a PCI bus. For this reason, wireless LAN integrated circuits often have a PCI bus interface.

JP 2001-308775 A Documents disclosed for acquisition at http://www.dtla.com

  On the other hand, in the future, it is highly likely that wireless LAN will be installed in so-called AV devices such as TVs and DVDs. In these AV devices, the interface between the AV processing unit (AV decoder or the like) and the network is generally an interface that directly exchanges AV stream data for various reasons such as ensuring synchronization. Therefore, it is desired that a wireless LAN integrated circuit has this AV stream interface. It is also essential to install a copyright protection function.

  However, if a copyright protection function is provided in the wireless LAN integrated circuit, AV data input / output to / from the wireless LAN integrated circuit becomes raw unencrypted data. This means that raw data flows on a general-purpose bus such as a PCI bus. In a general personal computer, it is relatively easy to create a program for holding data on a general-purpose bus in a specific area, and it is a problem that raw AV data flows on the general-purpose bus.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an efficient AV capable of performing AV data processing and copyright protection processing according to the type of installed device and interface use. To provide a communication control integrated circuit and an AV communication control program.

  According to one aspect of the present invention, reception control means for controlling reception of AV data via a network, and copyright protection of the received AV data and copyright protection of the received AV data are performed. Copyright protection processing is performed via a selection means for selecting any one of the non-AV data, a first connection terminal for outputting AV data not subjected to copyright protection processing, and a general-purpose bus interface. When AV data that has not been subjected to copyright protection processing is selected by the second connection terminal that outputs AV data and the selection means, a work that performs predetermined copyright protection processing on the AV data. And an AV communication control integrated circuit comprising a right protection processing means.

  Also, according to one aspect of the present invention, reception control means for performing control to receive AV data via a network, and among the received AV data, the AV data that is copyright-protected and the copyright protection First selection means for selecting any one of the AV data not subjected to copyright protection, an AV stream internal signal line for transmitting AV data not subjected to copyright protection processing, and copyright protection processing. A general-purpose internal bus capable of transmitting AV data, an external connection terminal connectable to both the AV stream internal signal line and the general-purpose internal bus, AV data on the AV stream internal signal line and the general-purpose An AV communication control integrated circuit comprising: second selection means for selecting any one of AV data on an internal bus and supplying the selected AV data to the external connection terminal is applied.

  As described above in detail, according to the present invention, since either AV data on the AV stream signal line or AV data on the general-purpose bus can be transmitted or received, each dedicated integrated circuit is not prepared. The integrated circuit design and manufacturing costs can be reduced.

  The AV communication control integrated circuit and the AV communication control program according to the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is a block diagram showing the overall configuration of an embodiment of an AV communication system according to the present invention. The AV communication system of FIG. 1 includes a wireless AV transmission device 1 that wirelessly transmits AV data, and a wireless AV reception device 3 that receives AV data from the wireless AV transmission device 1 via a wireless network 2. .

  The wireless network 2 in FIG. 1 is intended for a home network, but is not necessarily wireless, and may be a wired network such as Ethernet (registered trademark) or a bridge connection between the wireless network 2 and the wired network. Mixed network may be used.

  The wireless network 2 is, for example, a wireless LAN such as IEEE802.11a or IEEE802.11b.

  The wireless AV transmitter 1 is a device that can be a source device of AV data, such as a television, a set top box, a DVD player, or the like. General televisions and set-top boxes do not have a large data buffer between the MPEG processing unit and the wireless LAN-LSI, but have an interface for directly exchanging AV streams, synchronization clocks, and the like.

  On the other hand, the wireless AV receiver 3 is a device that can be a sink device for AV data, such as a display device such as a television, a speaker, or a recording / recording device.

  FIG. 2 is a block diagram showing an example of the internal configuration of the wireless AV transmitter 1 of FIG. This block configuration is mainly used in AV-only devices such as DVD players. The wireless AV transmission device 1 in FIG. 2 includes a wireless LAN-LSI 4 and an MPEG processing unit 5. The MPEG processing unit 5 includes, for example, an MPEG encoder having a function of MPEG-encoding a video signal, an MPEG receiving unit having a function of receiving a video signal (for example, a television broadcast), and a function of storing a video signal (for example, a hard disk or a DVD). ) MPEG storage unit. The MPEG processing unit 5 also has a function of transmitting digital AV data to be copyright-protected to the wireless LAN-LSI 4.

  The MPEG processing unit 5 is provided with at least one terminal for outputting MPEG data and a clock, and the wireless LAN-LSI 4 is connected to this terminal.

  The wireless LAN-LSI 4 has a function of performing copyright protection and AV data format processing in addition to a function of performing transmission / reception control of the wireless LAN.

  FIG. 3 is a block diagram showing another example of the internal configuration of the wireless AV transmitter 1 of FIG. This block configuration is mainly used in a PC. 3 includes a CPU 7, a memory 8, and a wireless LAN-LSI 4 connected to a general-purpose bus 6 such as a PCI bus.

  The CPU 7 executes MPEG processing by software. Note that a functional block that executes MPEG processing by hardware may be provided in the CPU 7.

  Since the processing capability of the CPU 7 has been dramatically increased year by year, it is considered that the configuration shown in FIG. 3 in which MPEG processing is performed by software is rapidly spread.

  The separate development of the wireless LAN-LSI 4 corresponding to any of the wireless AV transmitters of FIG. 2 and FIG. 3 is wasteful in terms of cost, so if possible, the same wireless LAN-LSI 4 should be connected to FIG. 2 and FIG. It is desirable that the wireless AV transmission apparatus 1 can be used.

  FIG. 4 is a block diagram showing an example of the internal configuration of the wireless LAN-LSI 4 that can be used by either of the wireless AV transmission apparatuses of FIG. 2 and FIG. 4 includes a clock transmission unit 11, a DTCP processing unit 12, a general-purpose bus I / F unit 13, a buffer 14, a selector 15, an I / F selection unit 16, and a wireless LAN processing unit. 17.

  The clock transmission unit 11 outputs a synchronization clock of AV data input from the outside to the wireless LAN side via the wireless LAN processing unit. The DTCP processing unit 12 performs DTCP copyright protection processing on the AV data supplied from the MPEG processing unit 5 of FIG. 2 via the AV stream signal line. The buffer 14 temporarily stores AV data supplied from the CPU 7 of FIG. 3 via the general-purpose bus and the general-purpose bus I / F unit 13.

  The selector 15 selects either AV data that has been subjected to copyright protection processing by the DTCP processing unit 12 or AV data that has been supplied from the general-purpose bus without performing copyright protection processing. Selection of the selector 15 is performed by the I / F selection unit 16. The AV data selected by the selector 15 is modulated by the wireless LAN processing unit 17 and transmitted to the wireless network 2.

  The reason why the DTCP processing unit 12 performs copyright protection processing on the AV data supplied via the AV stream signal line is that the MPEG processing unit 5 and the wireless LAN-LSI 4 in the case of the wireless AV transmission device of FIG. The AV stream signal line between the AV stream and the AV stream signal line is not connected anywhere else, and it is not necessary to perform copyright protection processing on the AV data on the AV stream signal line. -The copyright protection process is performed after input to the LSI 4.

  On the other hand, in the case of the wireless AV transmitter 1 of FIG. 3, since the AV data is exchanged using the general-purpose bus, if the copyright protection processing is performed inside the wireless LAN-LSI 4, the raw AV that is not encrypted is used. Since data passes on the general-purpose bus, there is a possibility that AV data may be illegally acquired by an AV capture device connected to the general-purpose bus. Therefore, in the case of the wireless AV transmitter 1 of FIG. 3, the copyright protection processing is performed by software on the CPU 7 side, and the encrypted AV data is supplied to the general-purpose bus. Therefore, it is not necessary to perform copyright protection processing inside the wireless LAN-LSI 4.

  The wireless LAN-LSI 4 in FIG. 4 has an external connection terminal t1 connected to the AV stream signal line and an external connection terminal t2 connected to the general-purpose bus. Since the wireless LAN-LSI 4 has many other terminals, it is desirable to reduce the number of terminals as much as possible.

  FIG. 5 is a block diagram showing an example of the internal configuration of the wireless LAN-LSI 4 in which AV data input terminals are combined. In FIG. 5, the same reference numerals are given to components common to FIG. 4, and different points will be mainly described below.

  The wireless LAN-LSI 4 in FIG. 5 includes a single external connection terminal t3 that can be connected to either the AV stream signal line or the general-purpose bus, and a selector 18 connected to the external connection terminal t3. The selector 18 selects whether the AV data input to the external connection terminal t3 is supplied to the AV stream internal bus or the general-purpose internal bus. Like the selector, the selector 18 selects an I / F selection unit. 16 is selected. The I / F selection unit 16 performs selection of the selectors 15 and 18 in synchronization with each other.

  FIG. 6 is a block diagram showing an example of the internal configuration of the wireless AV receiver 3 of FIG. This block configuration is mainly used in AV-only devices such as DVD players. The wireless AV receiver 3 of FIG. 6 includes a wireless LAN-LSI 21, an MPEG decoder 22 that decodes received MPEG format AV data, and a display control unit that performs control to display the received AV data on the display unit 23. 24.

  The wireless LAN-LSI 21 performs wireless LAN transmission / reception control, copyright protection processing, AV data format processing, and the like.

  FIG. 7 is a block diagram showing another example of the internal configuration of the wireless AV receiver 3 of FIG. This block configuration is mainly used in a PC. 7 has a CPU 26, a memory 27, a display memory & display device 28, and a wireless LAN-LSI 21 connected to a general-purpose bus 25 such as a PCI bus.

  The CPU 26 performs decoding processing of MPEG AV data and storage processing in the memory 27 by software.

  FIG. 8 is a block diagram showing an example of the internal configuration of the wireless LAN-LSI 21 corresponding to both the wireless AV receivers shown in FIGS. The wireless LAN-LSI 21 of FIG. 8 includes a wireless LAN processing unit 31, a clock extraction unit 32, a selector 33, an I / F selection unit 34, a DTCP processing unit 35, a buffer 36, and a general-purpose bus I / F unit. 37.

  The wireless LAN processing unit 31 receives a wireless signal including AV data via the wireless network 2. The clock extraction unit 32 extracts a clock synchronized with AV data from the received radio signal.

  The selector 33 selects whether to supply the AV data included in the received radio signal to the AV stream signal line or to the general-purpose bus based on the signal from the I / F selection unit 34. The AV data for the AV stream signal line selected by the selector 33 is decoded by the DTCP processing unit 35 and then supplied to the AV stream signal line. On the other hand, the general-purpose bus AV data selected by the selector 33 is temporarily stored in the buffer 36 and then supplied to the general-purpose bus via the general-purpose bus I / F unit 37.

  AV data supplied from the wireless LAN-LSI 21 of FIG. 8 to the AV stream signal line is input to the MPEG data of FIG. 6 and decoded. Also, AV data supplied from the wireless LAN-LSI 21 of FIG. 8 to the general-purpose bus is input to the CPU 26 of FIG. 7 and decoded by software.

  The wireless LAN-LSI 21 in FIG. 8 has an external connection terminal t4 connected to the AV stream signal line and an external connection terminal t5 connected to the general-purpose bus. The internal configuration of the wireless LAN-LSI 21 in which these terminals are integrated into one is shown in FIG. In FIG. 9, the same components as those in FIG. 8 are denoted by the same reference numerals, and different points will be mainly described below.

  The wireless LAN-LSI 21 of FIG. 9 includes a single external connection terminal t6 that can be connected to either the AV stream signal line or the general-purpose bus, and a selector 38 connected to the external connection terminal t6. The selector 38 selects either AV data output from the DTCP processing unit 35 or AV data output from the general-purpose bus I / F unit 37, and supplies the selected data to the external connection terminal t6. The selector 38 is selected by the I / F selection unit 34 as with the selector 33. The I / F selection unit 34 performs selection of the selectors 33 and 38 in synchronization with each other.

  FIG. 10 is a diagram showing an AV data transmission / reception sequence in the AV communication system of FIG. First, an AV control command for requesting reproduction of AV data is transmitted from the wireless AV receiver 3 to the wireless AV transmitter 1 by, for example, TCP / IP (step S1).

  In response to this request, the wireless AV transmitter 1 encrypts the AV data (step S2). Next, the wireless AV transmitting apparatus 1 transmits AV data to the wireless AV receiving apparatus 3 by, for example, RTP / IP (step S3). At this time, in the case of AV data requiring copyright protection, DTCP encryption is performed, and transmission port number = # x, reception port number = # y, TTL (Time To Live) = 1 is transmitted.

  The wireless AV receiving device 3 that has received the encrypted AV data recognizes that it has been encrypted when the AV data is received. Then, after giving a specific IP address and port number (or a number capable of specifying an RTP connection such as SSRC), an authentication key exchange for the RTP connection is requested (step S4).

  When the wireless AV transmitter 1 responds to this request, an authentication / key exchange procedure is performed between the wireless AV transmitter 1 and the wireless AV receiver 3 using a wireless layer packet or an Ethernet frame (step S5). . As a result, the wireless AV receiver 3 obtains a decryption key (step S6), and decrypts the AV content using this decryption key.

  As described above, in the present embodiment, the AV data supplied via the AV stream signal line is wirelessly transmitted after performing the copyright protection processing, and the AV data supplied via the general-purpose bus is wirelessly transmitted as it is. Since the wireless LAN-LSI 4 to be transmitted is provided in the wireless AV transmitter 1, the same wireless LAN-LSI 4 is used in both the wireless AV transmitter 1 having the AV stream signal line and the wireless AV transmitter 1 having the general-purpose bus. Can be used, and it is not necessary to develop separate LSIs, so LSI development costs can be reduced.

  In the present embodiment, when transmitting AV data included in the received wireless signal to the AV stream signal line, it is transmitted after performing copyright protection processing, and when transmitted to the general-purpose bus, Since the wireless LAN-LSI 21 that transmits without performing copyright protection processing is provided in the wireless AV receiver 3, even the wireless AV receiver 3 having the AV stream signal line has the wireless AV receiver 3 having the general-purpose bus. However, since the same wireless LAN-LSI 21 can be used and it is not necessary to separately develop LSIs, it is possible to reduce LSI development costs.

  In the above-described embodiment, the AV data supplied on the general-purpose bus has been described as being input to the wireless LAN-LSI 4 in an encrypted state. However, the wireless LAN is separated from the encryption on the general-purpose bus. In the LSI 4, DTCP encryption processing may be performed on AV data on the general-purpose bus. The internal configurations of the wireless LAN-LSIs 4 and 21 in this case are as shown in FIGS. 11 and 12, for example. 11 and 12 performs copyright protection processing on AV data on the general-purpose bus. At this time, an authentication key is exchanged with a partner (in this embodiment, MPEG software on the CPU) that exchanges AV data via the general-purpose bus in advance.

  The wireless LAN-LSIs 4 and 21 described in the above-described embodiments can also be realized by software. In that case, a program for realizing the functions of the wireless LAN-LSIs 4 and 21 may be stored in a recording medium such as a floppy (registered trademark) disk or CD-ROM, and read and executed by a computer. The recording medium is not limited to a portable medium such as a magnetic disk or an optical disk, but may be a fixed recording medium such as a hard disk device or a memory.

  Further, a program for realizing the functions of the wireless LAN-LSIs 4 and 21 may be distributed via a communication line (including wireless communication) such as the Internet. Furthermore, the program may be distributed through being stored in a recording medium via a wired line or a wireless line such as the Internet in a state where the program is encrypted, modulated, or compressed.

1 is a block diagram showing the overall configuration of an embodiment of an AV communication system according to the present invention. The block diagram which shows an example of an internal structure of the radio | wireless AV transmitter 1 of FIG. The block diagram which shows the other example of an internal structure of the radio | wireless AV transmitter 1 of FIG. FIG. 4 is a block diagram showing an example of an internal configuration of a wireless LAN-LSI 4 that can be used by either of the wireless AV transmission apparatuses of FIGS. 2 and 3. The block diagram which shows an example of an internal structure of the wireless LAN-LSI 4 which put together the input terminal of AV data. The block diagram which shows an example of an internal structure of the radio | wireless AV receiver 3 of FIG. The block diagram which shows the other example of an internal structure of the radio | wireless AV receiver 3 of FIG. FIG. 8 is a block diagram showing an example of an internal configuration of a wireless LAN-LSI 21 corresponding to both the wireless AV receivers shown in FIGS. 6 and 7. The block diagram which shows an example of the internal structure of the wireless LAN-LSI which put together the external connection terminal into one. The figure which shows the transmission / reception sequence of AV data in the AV communication system of FIG. The block diagram which shows an example of an internal structure of wireless LAN-LSI4 which added the general purpose bus encryption process part. The block diagram which shows an example of an internal structure of wireless LAN-LSI21 which added the general purpose bus encryption process part.

Explanation of symbols

1 wireless AV transmitter 2 wireless network 3 wireless AV receiver 4 wireless LAN-LSI
5 MPEG processor 6 General-purpose bus 7 CPU
8 Memory 11 Clock transmission unit 12 DTCP processing unit 13 General-purpose bus I / F unit 14 Buffer 15 Selector 16 I / F selection unit 17 Wireless LAN processing unit 18 Selector 21 Wireless LAN-LSI
22 MPEG decoder 23 Display unit 24 Display control unit 25 General-purpose bus 26 CPU
27 Memory 28 Display Memory & Display Unit 31 Wireless LAN Processing Unit 32 Clock Extraction Unit 33 Selector 34 I / F Selection Unit 35 DTCP Processing Unit 36 Buffer 37 General-Purpose Bus I / F Unit

Claims (4)

Reception control means for performing control to receive AV data via a network;
Among the received AV data, selection means for selecting one of AV data that is copyright-protected and AV data that is not copyright-protected,
A first connection terminal for outputting AV data not subjected to copyright protection processing;
A second connection terminal for outputting AV data that has undergone copyright protection processing via a general-purpose bus interface;
A copyright protection processing unit that performs a predetermined copyright protection process on the AV data when the selection unit selects AV data that has not been subjected to the copyright protection process; AV communication control integrated circuit. Reception control means for performing control to receive AV data via a network;
First selecting means for selecting one of AV data that is copyright-protected and AV data that is not copyright-protected among the received AV data;
AV signal internal signal line for transmitting AV data that has not been copyright protected,
A general-purpose internal bus capable of transmitting AV data that has undergone copyright protection processing;
An external connection terminal connectable to either the AV signal internal signal line or the general-purpose internal bus;
AV communication control, comprising: second selecting means for selecting any one of AV data on the AV stream internal signal line and AV data on the general-purpose internal bus and supplying the selected AV data to the external connection terminal. Integrated circuit. When the first selection means selects AV data to be supplied to the AV stream internal signal line, the first selection means includes copyright protection processing means for performing a predetermined copyright protection process on the AV data,
The second selection means selects one of AV data that has undergone copyright protection processing by the copyright protection processing means and AV data on the general-purpose internal bus, and supplies the selected data to the external connection terminal. The AV communication control integrated circuit according to claim 2. In the calculator,
Reception control means for performing control to receive AV data via a network;
The received AV data is supplied to an AV signal internal signal line for AV data transmission not subjected to copyright protection processing, or to a general-purpose internal bus capable of transmitting AV data subjected to copyright protection processing. A selection means for selecting whether to supply;
When the AV data supplied to the AV stream internal signal line is selected by the selecting means, the AV data is caused to function as copyright protection processing means for performing a predetermined copyright protection process on the AV data. ,
An AV communication control program that functions so that AV data on the AV stream internal signal line is output after copyright protection processing is performed by the copyright protection processing means.

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