JP2010166601A - Video signal transmitting device and video signal receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain a luminance/color difference signal transmission system which is capable of an interface which prevents a video signal from being readily duplicated and has proper affinity with the circuits of a television. <P>SOLUTION: In video transmission of a digital interface system, a video signal of a luminance/color difference signal is transmitted and at the same time, and colorimetry information and video aspect ratio information specifying conversion from the luminance/color difference signal to a primary color signal is transmitted. Thus, high-quality and high-definition video images can be played back, copyright protection of contents is attained, with which only a user managed by key information can use the contents, and a transmitting device, a receiving device and an interface with high affinity with television-based rationalized circuits can be provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a digital broadcast transmission apparatus, a video signal transmission apparatus such as a VTR and a DVD player, a display apparatus such as a television receiver or a personal computer monitor, and a video signal reception apparatus such as a VTR and a digital transmission / reception terminal.

  For example, when a personal computer is considered as the sending device and an analog display type display device is considered as the receiving device, for example, it generally has the configuration shown in FIG. The digital R, G, B output signals of the graphic chip 12 in the personal computer 1 are read in accordance with the timing of the clock synchronization signal generator 11, input to the three DACs 13 to 15, and output to the output connector 16 together with the synchronization signals. Analog R, G, B signals input from the input connector 21 of the monitor display 2 are subjected to contrast and black level adjustment by the preamplifier 22 and displayed on the analog display element 23. Similarly, the synchronization signal synchronizes the display element 23. FIG. 5 shows a so-called traditional interface, and the transmitted signal form is a baseband analog signal.

  An example of driving a digital display 3 such as a liquid crystal using this interface has the configuration shown in FIG. Analog R, G, B signals input from the input connector 21 are sampled using ADCs 33 to 35 using a clock regenerated from the synchronization signal via the clock regenerator 32, and drive the digital signal display element 36. A signal is displayed. In this system, there is a problem that the display quality of the video cannot be sufficiently obtained because the output clock of the clock regenerator 32 does not exactly match the clock of the original clock generator 11. In order to solve this problem, an automatic means for adjusting the phase of the clock is used.

  As a method for fundamentally solving this problem, a digital interface shown in FIG. 7 has been proposed and used. In the device 4 on the sending side, the R, G, B digital signals are input to the data converter 41 together with the clock and the synchronization signal. In the data converter 41, it is converted into a digital signal form that is not easily affected by the transmission path between the input and output connectors, and is output to the output connector 43. In addition, a DCI (Display Control Information) block 42 is a control for power saving of the display device (for example, functions such as video mute and sleep mode) that is performed by detecting the presence or absence of a synchronization signal in a conventional analog interface. Display control information for acting as a control signal. In the digital display monitor 5, the digital data signal transmitted from the input connector 51 is input to the data converter 52, and after obtaining the digital baseband R, G, B signal and the synchronization signal, the display element 53 is driven. And display the video. Further, the DCI signal sent from the connector 51 is also inputted to the display element 53. In this method, since the quality of the digital R, G, B signals of the graphic chip 12 is input to the display element 53 without deterioration, high quality display is possible. As a data conversion method, there is a serial transmission method called TMDS (Transition Minimized Differential Signaling).

  Now, when the digital interface is used and the connection device on the receiving side is an analog display element, the configuration is as shown in FIG. The output signal of the data converter 52 is once inputted to the DACs 13 to 15 and converted into analog signals, and then the preamplifier 22 and the display element 23 are driven. As a result, as compared with the circuit block of FIG. 5, the receiving device 6 requires the data converter 52 and the DACs 13 to 15, and the cost increases, so there is almost no advantage as an analog display device. It is difficult to spread the interface.

  However, in order to broadcast higher-quality content in line with the spread of digital broadcasting since 1998, it has been recognized that it is necessary to consider that it cannot be easily duplicated. A system has been proposed in which a decryption process is performed by a receiving device. An example is shown in FIG. The sending device 7 has key information 72 for encryption, and the digital R, G, B signals are subjected to encryption processing at the same time as data conversion in block 71 by the key information. Is transmitted. The receiving device 8 has key information 83 for decryption, and the data conversion processing is performed simultaneously with the decryption processing in the block 82 based on the key information, and after being input to the DACs 13 to 15, the display element A video signal is displayed at 23. In the case of this method, when receiving devices 5 and 6 that do not have key information for compounding are connected, the compounding process cannot be performed, and thus video display cannot be performed. Similarly, it is possible to prevent content copying by connecting the sending device 7 to a VTR or the like. In addition, from the viewpoint of protecting the copyright of this content, the idea that a slight cost increase is acceptable is also spreading.

  In the example of FIG. 9, the original function of “content copy prevention” is satisfied. However, in general, CRT-type analog display devices such as television receivers are the mainstream as receiving devices. For this reason, the following new problem arises.

  Problem (1): It is desirable that the video signal to be transmitted is not a primary color signal of R, G, B but a luminance and color difference signal of Y, Pb, Pr, etc. For this purpose, the sending side performs the conversion from the primary color signal to the luminance color difference signal, sends the information defining the conversion, and defines the conversion when the receiving side device performs the luminance color difference signal processing. It is desirable to use information. However, there is no mechanism for sending information defining the conversion.

  Problem (2): Similarly, there is no mechanism for sending the aspect ratio of a video signal such as broadcast content.

  Problem (3): The cost increases when a DCI control line is used to realize the above problems (1) and (2). Therefore, it is necessary to display video normally even in a display device that does not have a DCI control line.

  Problem (4): If there is no descrambling key information in the receiving device (display device), if the video is not displayed and blacked out, the user may misunderstand that the device is out of order. Therefore, even when the display device does not include the decryption key information, it is necessary to display some video so that the user is not mistaken for a failure.

  With respect to each of the problems (1) to (4), the present invention provides the following solution.

  For the problem (1), as described in claim 1, colorimetric information for determining an addition processing coefficient of a matrix circuit included in the display device is converted into composite video information (a digital video signal in the form of a luminance color difference signal, The transmission device is provided with means for transmitting it together with information including a clock signal and a horizontal / vertical synchronizing signal synchronized with the digital video signal of the luminance / chrominance signal format to solve the problem. On the receiving side, as described in claim 11, the problem is solved by determining the addition processing coefficient of the matrix circuit based on the colorimetric information.

  For the problem (2), as described in claims 2 and 3, a transmission device is provided with an aspect ratio information transmitting means for transmitting information relating to the aspect ratio of the digital video signal included in the composite video information. To solve the problem. On the receiving side, as described in claims 12 and 13, a predetermined aspect ratio conversion process is performed on the received video signal based on the received aspect ratio information.

For the problem (3), as shown in claim 19, the display device is provided with a synchronization frequency discrimination means for discriminating the frequency from a horizontal / vertical synchronization signal included in the composite video information, and the synchronization According to the result of the frequency discriminating means, the problem is solved by setting a colorimetric value for determining the addition processing coefficient of the matrix circuit and a default value of at least one of the aspect ratio of the display image. .

  With respect to the problem (4), as described in claims 8 and 9, the transmitting device enables two-way communication with the display device, and at least the encrypted composite video information is displayed from the display device. On the other hand, the first display information relating to the presence / absence of descrambling key information for performing descrambling processing is made receivable. Further, the transmitting device is provided with a determining unit that determines whether or not the display includes the descrambling key information based on the first display information received from the display device. When it is determined that the decryption key information is not provided, the clock signal and the horizontal / vertical synchronization signal are set to predetermined frequencies, and the composite video information is transmitted without performing encryption processing. The problem was solved. As a result, when the decryption key information is not authenticated, a low-resolution video signal is transmitted, and a user's erroneous determination that the receiver has failed due to blackout can be prevented.

  According to the present invention, it is possible to reproduce high-definition and high-definition video, and to protect the copyright of content that can be used only by a user managed by key information, and is compatible with a streamlined circuit of a television base. It is possible to provide a transmission device and a reception device that are excellent in performance.

The block block diagram which shows 1st Embodiment which concerns on this invention. The block block diagram which shows 2nd Embodiment which concerns on this invention. The block block diagram which shows 3rd Embodiment which concerns on this invention. The block block diagram which shows 4th Embodiment which concerns on this invention. The block block diagram which shows a prior art example. The block block diagram which shows a prior art example. The block block diagram which shows a prior art example. The block block diagram which shows a prior art example. The block block diagram which shows a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a principal block diagram of a video sending device and a video receiving device to which the present invention is applied, and shows a first embodiment of the present invention. In FIG. 1, a video transmission device 100 includes a clock and synchronization signal generator 101, a graphic chip 102, a data conversion and encryption processing block 103, a DCI signal processing block 104, an encryption key information block 105, an output connector 106, an aspect ratio. The information and colorimetry information transmission block 107 is constituted. The video receiving device 110 includes an input connector 111, a data conversion and descrambling processing block 112, a descrambling key information block 113, DACs 114 to 116, a luminance / color difference signal processing preamplifier 117, and an analog signal display element 118. The digital luminance color difference signals Y, Pb, and Pr output signals of the graphic chip 102 in the video transmission device 100 are read according to the timing of the clock synchronization signal generator 101 and input to the data conversion and encryption processing block 103. Here, encryption processing is performed simultaneously with data conversion in block 103 based on the encryption key information in the encryption key information block 105, and is transmitted as composite video information by the output connector 106. On the other hand, the aspect ratio information and colorimetry information of the video signal of the graphic chip 102 are also transmitted from the block 107, superimposed on the luminance color difference signal and the synchronization signal in the block 103, converted into data, and transmitted by the output connector 106. The DCI signal is sent directly from block 104 using connector 106.

  In the video receiving device 110, the data conversion process is performed simultaneously with the descrambling process in the block 112 based on the descrambling key information from the descrambling key information block 113, and the luminance color difference signal is output to the DACs 114 to 116. Then, the synchronization signal is output to the display element 118. The output signals of the DACs 114 to 116 are subjected to contrast processing, black level correction processing, image quality correction processing, and the like for the luminance signal in the preamplifier 117, and processing such as hue and color saturation adjustment for the color difference signal. Applied. The processed luminance and chrominance signals are added in a matrix circuit (not shown) built in the preamplifier 117. At this time, the luminance and chrominance signals are separated from the luminance and chrominance signals and the synchronization signal in a block 112 and passed through a signal line 119. An addition processing coefficient and the like are determined based on the input colorimetric information. The signal after matrix processing is input to the display element 118, and a video signal is displayed. By referring to the display aspect information output from the block 112 via the signal line 119, for example, when the image is a wide image (16: 9) and the actual aspect ratio of the display element 118 is 4: 3, the image is displayed. Signal processing such as compression up and down is performed in block 117 and the like. Conversely, when the display aspect information is standard video (4: 3) and the actual aspect ratio of the display element 118 is 16: 9, signal processing such as compressing the video to the left and right is performed in block 117 and the like. Do. In either case, vertical compression and horizontal compression in the block 117 are not performed, and it is possible to cope with the deflection processing.

  As described above, according to the present invention, the digital interface excellent in compatibility between the transmission system capable of protecting the content by the encryption and decryption function by the key information and the television circuit by the luminance color difference signal transmission and the signal aspect information transmission. It is possible to realize a sending device and an image receiving device.

  FIG. 2 is a diagram showing a second embodiment of the present invention, and the same functional blocks as those in the first embodiment are given the same numbers. In the first embodiment, the signal of the display aspect and colorimetry information block 107 is input to the data conversion encryption block 103. In the present embodiment, the DCI processing block 104 superimposes the signal with the DCI signal. It is said. The signal of the DCI block 104 is transmitted to the display element 118 of the image receiving apparatus 110 via the input / output connectors 106 and 111 and the like, but is also input to the display aspect and colorimetric information separation block 120 at the same time. The matrix processing and aspect conversion processing by the matrix circuit of the preamplifier 117 are controlled by the output information signal of the block 120, and the same effects as those of the first embodiment can be obtained.

  FIG. 3 is a diagram showing a third embodiment of the present invention, and the same functional blocks as those in the first and second embodiments are denoted by the same numbers. In the first and second embodiments, the signal of the display aspect and colorimetry information block 107 is input to the data conversion encryption block 103 or input to the DCI processing block 104, but the third embodiment Is an embodiment for dealing with both types of signal transmission, and for dealing with image receiving equipment when neither signal transmission is available.

  In the image receiving device 122, in addition to the configuration of the first embodiment, a display aspect / colorimetry information separation block 120, an H / V synchronization frequency determination block 123, and a display aspect / colorimetry determination block 124 are added. The operation and function of the block 120 are as described in the second embodiment, and the information obtained from the signal line 119 is also as described in the first embodiment. The function of the block 123 determines the frequency of the synchronization signal and outputs a determination result corresponding to, for example, the following five conditions.

  (1) When fH = 15.75 kHz and fV = 60 (or 59.94) Hz, video aspect = 4: 3, colorimetry = SMPTE 170M.

  (2) When fH = 31.5 kHz and fV = 60 (or 59.94) Hz, video aspect = 4: 3, colorimetry = SMPTE293M.

  (3) When fH = 33.75 kHz and fV = 60 (or 59.94) Hz, video aspect = 16: 9, colorimetry = SMPTE240M.

  (4) When fH = 45 kHz and fV = 60 (or 59.94) Hz, video aspect = 16: 9, colorimetry = SMPTE296M.

(5) In other cases, video aspect = 16: 9, colorimetry = SMPTE240M.
(Note that fH and fV are horizontal and vertical sync frequencies, and SMPTE is the name of the standardization committee for video signals in the United States.)
In block 124, when information cannot be obtained from block 120 or signal line 119, one of the above (1) to (5) is determined from the synchronization signal frequency discrimination result from block 123, and the aspect and colorimetry are determined. Then, the preamplifier 117 is controlled. In the present embodiment, even when colorimetry and aspect information are not transmitted, the system can generally obtain the same effects as those of the first embodiment.

  FIG. 4 is a diagram showing a fourth embodiment of the present invention, and the same functional blocks as those in the first and second embodiments are assigned the same numbers. In the first and second embodiments, the display aspect and colorimetry information are input to one of the block 103 or the DCI processing block 104, and in this embodiment, they are superimposed on both. In this embodiment, in the sending device 130, a connection determination block 133, a synchronization setting signal line 135, SW setting signal lines 134 and SW132, and a connected device information block 136 are added. In this embodiment, two functions can be realized: (a) a blackout prevention function of the image receiving device, and (b) a false recognition prevention function of the connected device.

  The function (a) will be described below. If the output signal of the block 107 is input to the blocks 104 and 103, the aspect and colorimetry control is performed if the image receiving apparatus supports either signal information from the DCI line or signal information from the data conversion output. Is possible. On the other hand, in this embodiment, the signal line connecting the image receiving device and the sending device is bidirectional, and the sending device has a function of authenticating the key information of the image receiving device. 133 re-synchronizes the block 131 via the signal line 135 so that “fH = 15.75 kHz, fV = 60 Hz, interlace ratio 1: 2” or “fH = 31.5 kHz, fV = 60 Hz”. Control to set. As a result, the output signals Y, Pb and Pr of the graphic chip 102 become so-called “NTSC grade” or “VGA grade”, and based on this signal, the block 103 only performs data conversion (no encryption). Through the connector 106, it is possible to display a low-resolution video on the image receiving device. That is, when key authentication is performed, a high-definition video signal can be displayed, and when key authentication is not performed, a low-resolution video signal is displayed. As a result, blackout can be prevented.

  Next, the function (b) will be described. The connected device information block 136 stores information for inquiring whether or not the image receiving device is compatible with luminance color difference signal input such as Y, Pb, and Pr. When this information is input to the blocks 104 and 103 together with the information of the block 107, it is superimposed on both the signal information of the DCI line or the signal information from the data conversion output. In this embodiment, since the signal line connecting the image receiving device and the sending device is bidirectional, and the DCI signal line is also bidirectional, the image receiving device can return information indicating that “luminance color difference signal input support is possible”. It is. For example, it is desirable to define and standardize a command in the command extension area of DCI2AB. If a command saying “luminance / chrominance signal input support is possible” is returned, the video signal will continue to be sent. The determination block 133 performs control so that the signal input of the SW 132 is switched from Y / Pb / Pr to the R / G / B side. As a result, the R, G, B primary color signals are converted, encrypted, and output to the connector 106 at the same time, and at the same time, the block 107 transmits that the colorimetric information is a “primary color signal”. As a result, even if a monitor display for a personal computer that accepts only RGB input is connected to the image receiving device, even if the connector 106 of the same standard is used, an image is displayed in the wrong color. This can be prevented and various connection forms can be realized. As a result, it is possible to reproduce high-definition and high-definition video, and to protect the copyright of content that can only be used by users managed with key information, and has excellent compatibility with the streamlined circuit of television base Delivery devices, display devices, and interfaces can be provided.

  In this embodiment, an example of application in a display device has been described as a device having an input connector. However, the display device includes a television, a front data projector, a personal computer monitor, and a recording device such as a VTR. There may be. In short, any function that can receive a digitized video signal (including a digital broadcast signal) can realize this function, and its form is not limited to that described in this embodiment.

DESCRIPTION OF SYMBOLS 100 ... Video transmission apparatus, 101 ... Clock and synchronous signal generator, 102 ... Graphic chip, 103 ... Data conversion and encryption processing block, 104 ... DCI signal processing block, 105 ... Encryption key information block, 106 ... Output connector, 107: Display aspect and colorimetry information transmission block, 110: Video receiving device, 111: Input connector, 112: Data conversion and descrambling processing block, 113: Decryption key information block, 114, 115, 116: DAC, 117: Luminance Pre-amplifier for color difference signal processing, 118... Analog signal display element.

Claims (19)

In a video signal transmitting device for transmitting composite video information including a digital video signal in a luminance / chrominance signal format, a clock signal synchronized with the digital video signal in the luminance / chrominance signal format and a horizontal / vertical synchronizing signal to a video signal receiving device,
The luminance color difference signal format is converted into a primary color signal, and colorimetric information transmitting means for transmitting colorimetric information for determining an addition processing coefficient of a matrix circuit included in the video signal receiving device is provided. Video signal transmission equipment.   2. The video signal transmitting device according to claim 1, further comprising an aspect ratio information transmitting means for transmitting information relating to an aspect ratio of the digital video signal. In a video signal transmitting device for transmitting composite video information including a digital video signal in a luminance / chrominance signal format, a clock signal synchronized with the digital video signal in the luminance / chrominance signal format and a horizontal / vertical synchronizing signal to a video signal receiving device,
A video signal transmitting apparatus comprising an aspect ratio information transmitting means for transmitting information relating to an aspect ratio of the digital video signal.   4. The video signal transmitting apparatus according to claim 1, wherein the composite video information is encrypted with key information.   The video signal transmitting apparatus according to claim 2, wherein at least one of the colorimetry information and the aspect ratio information is superimposed on the composite video information.   The video signal transmitting device according to claim 2, further comprising control information transmitting means for transmitting control information for controlling the video signal receiving device, wherein at least one of the colorimetry information and the aspect ratio information is: A video signal transmitting device superimposed on the control information.   The video signal transmitting apparatus according to claim 6, wherein the control information is transmitted through a signal line different from a signal line for transmitting the composite video information.   A first display relating to the presence / absence of descrambling key information for performing descrambling processing on the encrypted composite video information from the video signal receiving device, enabling bidirectional communication with the video signal receiving device; 5. The video signal transmitting apparatus according to claim 4, wherein the video signal transmitting apparatus receives second display information related to information and / or whether to correspond to luminance / chrominance signal input.   9. The video signal transmitting device according to claim 8, further comprising: a determination unit configured to determine whether the display includes the descrambling key information based on the first display information received from the video signal receiving device. And when the determination means determines that the video signal receiving device does not include the decryption key information, the clock signal and the horizontal / vertical synchronization signal are set to a predetermined frequency, and the composite A video signal transmitting apparatus, wherein video information is transmitted without performing encryption processing.   The video signal of the luminance color difference signal format or the video signal of the primary color signal format is switched and output based on the second display information received from the video signal receiving device. Item 9. The video signal transmission device according to Item 8. Luminance color difference signal format digital video signal, composite video information including a clock signal and horizontal / vertical synchronization signal synchronized with the digital video signal of luminance color difference signal format is received from the transmitting device, and the luminance color difference signal included in the composite video information In a video signal receiving device having a matrix circuit that converts a digital video signal of a format into a primary color signal,
The video which receives the colorimetric information for determining the addition processing coefficient of the matrix circuit together with the composite video information from the transmitting device, and determines the addition processing coefficient of the matrix circuit based on the colorimetry information Signal receiving equipment.   12. The video signal receiving apparatus according to claim 11, further comprising information related to an aspect ratio of the digital video signal. In a video signal receiving device that receives composite video information including a digital video signal in a luminance color difference signal format, a clock signal synchronized with the digital video signal in the luminance color difference signal format, and a horizontal and vertical synchronization signal from a transmission device,
Information on an aspect ratio of the digital video signal is received together with the composite video information from the transmitting device, and a predetermined aspect ratio conversion process is performed on the received video signal based on the aspect ratio information. Video signal receiving device.   The video signal receiving apparatus according to claim 11, wherein the composite video information is encrypted.   The video signal receiving apparatus according to claim 12, wherein the colorimetry information or the aspect ratio information is superimposed on the composite video information.   The control information for controlling the video signal receiving device is further received from the transmitting device, and the colorimetry information or the aspect ratio information is superimposed on the control information. Video signal receiving equipment.   17. The video signal receiving apparatus according to claim 16, wherein the control information is transmitted through a signal line different from a signal line for transmitting the composite video information.   First display information relating to presence / absence of descrambling key information for enabling two-way communication with the transmitting device and at least performing descrambling processing on the encrypted composite video information with respect to the transmitting device; and 15. The video signal receiving apparatus according to claim 14, wherein second display information relating to whether or not it corresponds to luminance / chrominance signal input is transmitted. Luminance color difference signal format digital video signal, composite video information including a clock signal and horizontal / vertical synchronization signal synchronized with the digital video signal of luminance color difference signal format is received from the transmitting device, and the luminance color difference signal included in the composite video information In a video signal receiving device having a matrix circuit that converts a digital video signal of a format into a primary color signal,
A colorimetry value for determining an addition processing coefficient of the matrix circuit according to a result of the synchronization frequency determination means, having a synchronization frequency determination means for determining the frequency from a horizontal and vertical synchronization signal included in the composite video information And a default value of at least one of the aspect ratio of the display video is set.

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