JP2009071558A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the user-friendliness of video information by making it possible to cope with both compressed video information and base-band video information. <P>SOLUTION: The display device includes an input unit which can input coded compressed video information and coded first base-band video information, a code decoding unit which decodes codes of the compressed video information and first base-band video information inputted from the input unit, an expansion unit which expands the compressed video information decoded by the code decoding unit to obtain second base-band video information, and a display unit which displays at least one of the first base-band video information decoded by the code decoding unit and the second base-band video information from the expansion unit. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly to a display device that can handle both compressed video information and baseband video information.

  In order to connect a video device and a video display device, which is another video device, to view a video or the like, a method of transmitting a video signal and an audio signal through an analog connection has been used. However, with the spread of digital devices, from the viewpoint of preventing image quality deterioration and copyright protection, a method of digitally connecting and encrypting and transmitting a video signal and an audio signal is used.

  As an example of digital transmission, one using a single cable conforming to the IEEE 1394 standard is known. In this method, mutual authentication is performed between devices that perform transmission and reception, and after the authentication, a video signal and an audio signal are multiplexed, and the multiplexed data is transmitted by performing an encryption process called DTCP.

  As another example, the HDMI system is known. In the HDMI system, a baseband signal and an audio signal of a high-definition video signal are time-division multiplexed, and an encryption process called HDCP can be performed for transmission.

  Such a conventional technique for multiplexing and transmitting a digitized video signal and audio signal is disclosed, for example, in Patent Document 1 below.

JP 2002-232377 A

  The IEEE 1394 standard is used as a network, and the transmission rate that can be transmitted and received is limited. Therefore, a high-definition video signal with a large amount of information cannot be sent as a baseband signal as it is. For this reason, the IEEE 1394 standard has a problem that the baseband signal must be compressed and transmitted at a reduced transmission rate. On the other hand, in the HDMI method, it is not considered that a device that receives a transmitted high-definition video signal records the received signal.

  In addition, these methods are all premised on the connection between stationary devices in the home, so that portable devices such as digital cameras and mobile phones can be conveniently connected to video display devices. Consideration was not enough.

  The present invention has been made in view of such problems. The present invention provides a technique for improving the convenience of video information in a display device. The present invention also provides a technique for conveniently connecting a portable device such as a digital camera or a mobile phone to a video display device.

  The present invention includes an input unit capable of inputting encrypted compressed video information and encrypted first baseband video information, and encryption of compressed video information and first baseband video information input from the input unit. An encryption / decryption unit for decrypting, a storage unit for storing compressed video information combined by the encryption / decryption unit, and decompressing the compressed video information decrypted by the encryption / decryption unit to obtain second baseband video information And a display unit for displaying at least one of the first baseband video information decrypted by the encryption / decryption unit and the second baseband video information from the decompression unit.

  Since the display device configured as described above can display the decoded first baseband video information or the second baseband video information from the decompression unit, it is possible to carry a digital camera, a mobile phone or the like. When it is connected to a video display device and a video display device, or when signal connection is performed through these portable devices, it is possible to display the video information of each other conveniently.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the convenience of video information in a display apparatus.

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

  FIG. 1 shows a first embodiment of the present invention. In FIG. 1, for example, three video devices are shown as video devices. One is a video device 100 that is, for example, a portable video device capable of receiving a digital broadcast signal from a base station antenna 20 or a broadcast transmission tower 30 of a mobile phone, one is a video display device 200, and the other is a video display device 200. A receiver 300 that can receive a digital broadcast signal from the broadcast transmission tower 30, such as a tuner. The video device 100 and the video display device 200 are connected by, for example, the bidirectional interface 10, and the video display device 200 and the receiver 300 are connected by another bidirectional interface 11. This enables bidirectional communication of video signals, other information, and signals between the devices.

  In the present embodiment, the portable video device 100 is specifically a digital camera, a video camera, a mobile phone, a game machine, a personal media player, or the like. Although necessary constituent elements are not necessarily the same depending on each form, the embodiment shown in FIG. 1 mainly describes necessary constituent elements for input / output with the outside.

  In FIG. 1, a base station antenna 20 of a mobile phone and an antenna 102 of a video device 100 transmit and receive signals. When the video device 100 is used as a mobile phone, signal processing as a normal mobile phone is performed. The video device 100 can also receive content such as a movie transmitted from the base station antenna 20 of the mobile phone. In this case, the content can be viewed on a display device or an audio output device built in the video device 100, or can be viewed on a large screen on the external video display device 200 via the terminal 101, the connection cable 10, and the terminal 201. You can also Further, in order to view the content while watching the content or later, the content is recorded in a storage medium built in the video device 100 or a storage medium (for example, the memory 121) connected to the video device 100. You can also The memory 121 can also be used as a recording medium for recording movies and the like.

  Similarly, a program broadcast from the broadcast transmission tower 30 is received by the broadcast receiver 180 of the video equipment 100 and can be viewed by the video equipment 100, or a storage medium (not shown) built in the video equipment 100. Or a connected storage medium (for example, the memory 121). Furthermore, the video display device 200 can be viewed via the terminal 101, the connection cable 10, and the terminal 201.

  A program broadcast from the broadcast transmission tower 30 is received by a receiving antenna 310 connected to the receiver 300, is input to the receiver 300 via an antenna terminal 302, is subjected to signal processing as appropriate, and is then subjected to a terminal 301. The video display device 200 is viewed through the connection cable 11 and the terminal 202. Further, a program selected simultaneously with viewing or separately from viewing can be stored in the memory 321 via a built-in storage medium (not shown) or the memory interface 320. The memory 321 recorded by the receiver 300 can also be connected to the memory interface 120 of the video equipment 100. If the video device 100 is taken out of the house and displayed on a display device (not shown) built in the video device 100, a program recorded at home can be viewed outside the home.

  Furthermore, by mounting the imaging device 110 and the microphone 112 on the video device 100, still images and moving images can be taken together with sound, and can be stored in a built-in storage medium (not shown) or the memory 121 as appropriate. . The video and audio stored in the built-in storage medium and the memory 121 can be viewed on the video display device 200 via the terminal 101, the connection cable 10, and the terminal 201.

  In the embodiment shown in FIG. 1, the terminal 101 of the video equipment 100 and the terminal 201 of the video display device 200, and the terminal 301 of the receiver 300 and the terminal 201 of the video display device 200 are connected by wired cables such as the connection cables 10 and 11, respectively. Shows when to do. However, when transmitting and receiving signals between these video devices, there is no need to connect using a wired cable, and connection may be made wirelessly. Wireless connection eliminates the hassle of wiring and arrangement of wiring. When a connection cable is used, there is an advantage that it is more resistant to interference such as noise than the case of wireless connection.

  FIG. 2 shows the first embodiment of the present invention and shows a specific configuration of the video equipment 100 of FIG. In FIG. 2, the imaging device 110 takes in a moving image or a still image input through the optical system and converts it into an electrical signal. In the case of a moving image, the compression circuit 111, for example, MPEG2, MPEG4, AVC / H. In the case of a still image, the captured image is efficiently bit-compressed using a compression method such as JPEG, for example.

  On the other hand, the microphone 112 converts sound waves into electrical signals. The compression circuit 113 efficiently compresses the captured audio signal using a compression method such as MPEG audio.

  When a still image is shot with the video device 100, the video device is rotated according to the subject to be shot, and is used in a horizontal position or a vertical position. The sensor 114 detects whether the video device 100 is used for shooting in the horizontal position or used for shooting in the vertical position. When used in the vertical position, it is detected at the same time whether the right side or the left side of the video equipment 100 is up. Information detected by the sensor 114 is input to the microprocessor 115.

  The multiplexing circuit 116 receives the bit-compressed video signal and audio signal from the compression circuits 111 and 113, and various information from the microprocessor 115, and multiplexes them according to a predetermined format. When a still image is taken, an audio signal is not normally captured, but the audio signal may be multiplexed in accordance with still image shooting.

  Various information from the microprocessor 115 includes position information (horizontal, right vertical, left vertical) using the sensor 114, date, exposure information at the time of photographing, and the like.

  FIG. 3 is a diagram showing the order of signal processing for each block, which is generally performed in image compression. As shown in FIG. 3A, signal processing is performed in order from the left to the right in the upper stage of the image, and then signal processing is performed in order from the left to the right in the second stage. As shown in FIG. 3B, when the right side of the video equipment 100 is set vertically, signal processing is performed from the bottom to the top of the left column and then from the bottom to the top of the second column from the left. As shown in FIG. 3C, when the left side of the video equipment 100 is set in the vertical position, signal processing is performed from the top to the bottom of the right column and then from the top to the bottom of the second column from the right. .

  When the camera is set to the vertical position at the time of shooting, it is impossible to display the shot video as it was shot when it is displayed on the display device without information on which of the left and right sides is up. Therefore, as described above, the position information is multiplexed as various information from the microprocessor 115 on the video signal and the audio signal. By expanding the compressed signal and performing signal processing of rotating the image 90 degrees rotated using the position information in accordance with the output of the display device, it is possible to perform display as captured.

  Instead of multiplexing the position information, the position information is given from the microprocessor 115 to the compression circuit 111 to control the compression circuit 111 as indicated by the dotted line from the microprocessor 115 to the compression circuit 111 in FIG. Thus, the compression circuit 111 can perform the compression signal processing itself according to the image capturing operation of the image and the image capturing position of the image device 100, thereby eliminating the need for the rotation process at the time of reproduction. For example, as shown in FIGS. 3D and 3E, based on the position information, compressed signal processing is performed from the upper left to the right of the image at the time of shooting, and subsequently from the left to the right of the second stage. Thus, it is possible to display the image as it was captured during playback.

  When both the still image and the moving image can be shot with the video device 100, as described above, when shooting a still image, shooting is performed in the horizontal position or in the vertical position. Similarly, even in the case of moving image shooting, there are users who consider using the video device 100 in the vertical position.

In the case of a moving image, rotation signal processing is generally not prepared, and when displayed on the image display device 200 as it is, a horizontally rotated image is displayed, resulting in unintended shooting for the user. .
Therefore, in the case of imaging in the moving image mode, when the user rotates and uses the video device 100, the sensor 114 detects use in the vertical position, and the microprocessor 115 causes the display device 160 to alert the display device 160. Is displayed. The display device 160 is used as a monitor for an image captured by the image capturing device 110, so that it is easy to check a message while photographing, and when the user does not intend, the user can shoot in a normal lateral position. Call attention to change.

  At the same time, in the case of use in the vertical position, position information is sent from the microprocessor 115 to the compression circuit 111 to control the compression circuit 111. As a result, for example, the compression circuit 111 can perform compression signal processing in the vertical position so that it can be reproduced in accordance with the image capturing operation or the image capturing position of the image device 100 as shown in FIGS. The upper stage performs compressed signal processing from left to right. As a result, the current television can be viewed in the vertical position. The detailed description will be given later.

  In FIG. 2, the signal multiplexed by the multiplexing circuit 116 is stored in the storage device 130 via the encryption / decryption circuit 140. As the storage device, for example, a hard disk device, an optical disk device, a semiconductor memory device, or the like can be used. The storage device to be used depends on the desired storage capacity, size, and ease of taking out the storage medium. You can decide by considering the price. Further, it can be stored in the memory 121 via the signal processing circuit 124 and the memory interface 120.

  As for information photographed by individuals, since the photographer himself has the copyright, it is usually not necessary to encrypt the information. However, since the medium stored in the storage device 130 may be lost, the output signal of the multiplexing circuit 116 is encrypted by the encryption / decryption circuit 140 and then stored in the storage device 130 or the memory 121. Safety can be increased.

  In some cases, the video device 100 supports a removable memory, or has a mobile phone function or a wireless LAN function. The memory interface 120 is an interface of the removable memory 121, and still images, video images, and audio contents are recorded in the memory 121 by other devices, and the signal processing circuit 124, encryption / encryption is connected to the interface 120. The data can be recorded in the storage device 130 via the decryption circuit 140.

  At this time, whether the content recorded in the memory 121 is copyright-protected and whether or not copying is restricted is detected by the signal processing circuit 124 and encrypted by the encryption / decryption circuit 140 according to the conditions, and stored in the storage device Go to 130.

  Similarly, even when still images, moving images, and audio contents are received and input by the wireless interface 122, they are recorded in the storage device 130 via the signal processing circuit 124 and the encryption / decryption circuit 140. Also in this case, the encryption / decryption circuit 140 performs encryption as necessary in accordance with the copyright protection and copy restriction conditions of the content.

  When the content stored in the storage device 130 is played back and viewed, the content to be viewed is selected using an input key or a remote controller (not shown), and the selected content is read from the storage device 130 and encrypted. The encryption / decryption circuit 140 decrypts the encryption, and the demultiplexing circuit 141 separates it into a video signal and an audio signal.

  When the broadcast receiver 180 receives a broadcast, the encryption for the broadcast is decrypted by the encryption / decryption circuit 140, and if necessary, the encryption process for storage is also performed by the encryption / decryption circuit 140. And record it in the storage device 130 and the memory 121. When the received broadcast is directly viewed, the demultiplexing circuit 141 is separated into a video signal and an audio signal.

  The separated and compressed video signal is expanded by the expansion circuit 142 and input to the signal processing circuit 150. The signal processing circuit 150 performs scanning line conversion in accordance with the scanning lines of the display device 160 and outputs the result to the display device 160.

  The separated and compressed audio signal is expanded by the expansion circuit 143 and output to the audio output device 161. Thus, since the video equipment 100 includes the display device 160 and the audio output device 161, it is possible to view the video device 100 without connecting the video display device to the outside. It should be noted that there is a sense of incongruity when there is a time difference in video display, audio output, or the like due to the difference in time required for the expansion process of the video signal and the audio signal, the presence or absence of the scanning line conversion process, and the like. In particular, it takes time to process the video signal, and when the audio signal precedes the video signal, a sense of incongruity increases. For example, delay processing of the audio signal is performed in the expansion process, and so-called lip sync adjustment is performed. Thereby, the uncomfortable feeling due to the difference between the video signal and the audio signal can be eliminated.

  On the other hand, when the video signal and the audio signal are viewed on the external video display device 200, the scan lines that can be handled by the video display device 200 are confirmed, and when the video signal and the audio signal match the scan lines of the video signal to be displayed. If the signals are output as they are and if they are different, the signal processing circuit 150 converts them into necessary scanning lines, and the multiplexing circuit 170 performs time-axis multiplexing with the audio signal processed by the signal processing circuit 151. In the signal processing circuit 151, the audio signal is time-axis compressed during a period corresponding to the blanking period of the video signal, and time adjustment for lip sync adjustment is performed as necessary. The video signal and the audio signal multiplexed by the multiplexing circuit 170 are input to the encryption circuit 171, performing encryption processing necessary for transmission between the video device 100 and the video display device 200, and via the interface 172 and the terminal 101. Output to the video display device 200.

  As described above, when the video device 100 is used in the vertical position in spite of the moving image and the signal processing is performed as shown in (d) and (e) of FIG. In step 150, scanning line conversion is performed, and the number of scanning lines that can be captured by the video display device 200 is converted and output. In that case, there are portions where signals are not projected on the left and right sides of the screen. It is displayed on the display device 160 in a so-called side panel state.

When the signal output from the terminal 101 is accumulated at the receiving destination, the compressed signal is output without being expanded. In this case, a signal compressed from the encryption / decryption circuit 140 is input to the encryption circuit 171, encrypted after transmission is performed, and then output via the interface 172 and the terminal 101.
In the above description, the video signal and audio signal captured from the imaging device 110 and the microphone 112 and the content input from the memory 121 and the wireless interface 122 are recorded in the storage device 130 and then played back. I made it. However, when accumulation is unnecessary or when viewing directly, the demultiplexing circuit 141 may perform processing without performing encryption or encryption decryption processing for accumulation in the encryption / decryption circuit 140. In this way, the user can view video and audio using the display device 160 and the audio output device 161 built in the video device 100, or can view the image with a receiver connected to the outside via the output interface 172. It becomes possible to do.

  FIG. 4 shows a specific configuration of the video display apparatus 200 shown in FIG. The same parts are denoted by the same reference numerals, and details thereof will not be described.

  First, a case where the signal input from the terminal 201 or the terminal 202 is an uncompressed moving image baseband signal will be described. A signal input from the terminal 201 or the terminal 202 is input to the encryption / decryption circuit 211 via the input / output interface 210. The encryption / decryption circuit 211 corresponds to the encryption of the encryption circuit 171 shown in FIG. 2 and decrypts the data encrypted by the encryption circuit 171. The decrypted signal is input to the demultiplexing circuit 250, and the video signal and the audio signal are input to the signal processing circuits 251 and 252, respectively. The signal processing circuit 251 performs scanning line conversion and resolution conversion in accordance with the number of pixels that can be displayed on the display 260. The signal processing circuit 252 expands the time axis of the audio signal multiplexed by time axis compression for the blanking of the video signal, and further performs lip sync adjustment, sound quality adjustment, and the like as necessary. The output signals of the signal processing circuits 251 and 252 are input to the display 260 and the audio output device 270, respectively, for viewing.

  Next, a case where a compressed moving image signal is input from the terminal 201 or the terminal 202 will be described. The purpose of inputting the compressed signal is to store the moving image signal in the storage device 230 built in the video display device side 200.

  A signal input from the terminal 201 or the terminal 202 is input to the encryption / decryption circuit 211 via the input / output interface 210. The encryption / decryption circuit 211 corresponds to the encryption of the encryption circuit 171 shown in FIG. 2, and decrypts the one encrypted by the encryption circuit 171. The encrypted / decrypted signal is input to the encryption / decryption circuit 240. The encryption / decryption circuit 240 reads the copy control information of the content to be stored, and performs encryption processing for storage accordingly. The encrypted signal is input to the storage device 230 and stored in a compressed state.

  When viewing the compressed signal input from the terminal 201 or the terminal 202 while accumulating, the signal corresponding to the compressed signal decrypted by the encryption / decryption circuit 211 is first demultiplexed from the encryption / decryption circuit 240. It is input to the circuit 241. Subsequently, the inverse multiplexing circuit 241 separates the compressed video signal and audio signal. The separated video and audio signals are expanded by the expansion circuits 242 and 243, returned to the baseband, and then input to the signal processing circuits 251 and 252, respectively. In the same manner, the video is input to the display 260 and the audio output device 270 for viewing.

  When the content stored in the storage device 230 is played back and viewed, the title of the content stored in the storage device 230 is displayed on the display 260 and selected, and the signal of the selected content is stored in the storage device 230. To the encryption / decryption circuit 240. The encryption / decryption circuit 240 decrypts the encryption of the signal of the selected content, inputs it to the demultiplexing circuit 241, and can be viewed by processing in the same manner.

  Similarly, the content stored in the memory 221 can be reproduced. Similar to the reproduction of the content stored in the storage device 230, the content to be viewed is selected from the content stored in the memory 221, and the selected content is encrypted / encrypted / decrypted by the memory interface 220 and the signal processing circuit 224. To enter. The signal processing circuit 224 performs processing necessary for reading content from the memory 221, and inputs the compressed and multiplexed video signal and audio signal to the encryption / decryption circuit 240. The subsequent signal processing is the same as when content is read from the storage device 230.

  In addition, content can be stored in the memory 221 in the same manner as in the storage device 230. Although detailed description of the processing in that case is omitted, the content encrypted by the encryption / decryption circuit 240 is stored in the memory 221 via the signal processing circuit 224 and the memory interface 220.

  The same processing is performed when viewing and storing content transmitted wirelessly. The compressed content transmitted wirelessly is input to the encryption / encryption / decryption circuit 240 via the wireless interface 222 and the signal processing circuit 224. The encryption / decryption circuit 240 decrypts encryption for encryption processing necessary for wireless transmission. The subsequent processing is the same as the processing at the time of reproduction from the storage device 230.

  Even when an uncompressed baseband signal is input from the terminal 201 or the terminal 202, the content can be efficiently stored in the storage device 230 and the memory 221. The operation in that case will be described below.

  The content input from the terminal 201 or the terminal 202 is separated into a video signal and an audio signal via the input / output interface 210, the encryption / decryption circuit 211, and the demultiplexing circuit 250. The separated video signal and audio signal are input to the compression circuits 281 and 282 through the duplication control circuit 280. The copy control circuit 280 reads the copy control information multiplexed on the input content and determines whether or not copying is possible. The duplication control information can be multiplexed with video information or audio information itself by assigning bits to a designated portion or using digital watermark technology.

  The compression circuit 281 converts the video signal into, for example, MPEG2, MPEG4, AVC / H. Compress using a compression method such as H.264. The compression circuit 282 compresses the audio signal using a compression method such as MPEG audio. The compressed video signal and audio signal are input to the multiplexing circuit 283, multiplexed, input to the encryption / decryption circuit, and can be stored in the storage device 230 and the memory 221 in the same manner. Thereby, according to the copyright information, the content can be efficiently recorded for a long time.

  So far, the present embodiment has been described with respect to the case where the video signal and the audio signal output mainly from the video device 100 are transmitted to the video display device 200. Furthermore, the present embodiment will be described with reference to FIG. 6 in the case where two video devices 100 are connected to each other. In FIG. 6, the video equipment 1 and the video equipment 2 are both configured by a portable video equipment 100 such as a mobile phone or a digital camera, and a connection cable that is a bidirectional interface between the terminals 101. 10 is connected. With this configuration, content such as a movie received from the base station antenna 20 of the mobile phone is transmitted to the video device 2 via the connection cable 10 as received by the video device 1. Can be displayed using the display device 160, or can be output using the audio output device 161 in the video equipment 2. When transmitting content stored in the storage device 130 in the video equipment 1, the desired content is read from the storage device 130 based on the content of the control signal from the video equipment 2 and encrypted / decrypted. The circuit 140 decrypts the cipher. Then, the encryption circuit 171 performs encryption processing necessary for transmission to the outside, and then outputs it via the interface 172 and the terminal 101. At this time, the control signal from the video device 2 includes mutual authentication for confirming that the video device 1 and the video device 2 are legitimate devices, a synchronization control signal for synchronizing signal processing, A transmission request signal, an identification signal indicating the video equipment 1 and the like are used. A control signal is also transmitted from the video device 1 to the video device 2 as necessary.

  Signals transmitted and received between the video equipment 1 and the video equipment 2 are not only those received from the base station antenna 20 of the mobile phone in this way, but those received from the broadcast receiver 180 or stored. The content stored on the device 130 or the content stored on the memory 121 may be used.

  The video equipment 1 and the video equipment 2 are the same video equipment 100, for example. These video devices are connected to each other via a bidirectional interface as described above. Information such as video and audio may be sent from the video device 1 to the video device 2, but information such as video and audio can also be sent from the video device 2 to the video device 1. Here, the direction in which information is transmitted from the video device 1 to the video device 2 is referred to as “up”, and conversely, the direction in which information is transmitted from the video device 2 to the video device 1 is defined as “down”. . Of course, the opposite directions may be referred to as “up” and “down”, respectively. The bidirectional interface for connecting the video equipment 1 and the video equipment 2 to each other is configured such that the transmission rate is asymmetric between upstream and downstream, that is, the transmission rates are different from each other. Then, in the case of sending information such as wideband video and audio from the video device 1 to the video device 2 in the upstream direction, narrowband control from the video device 2 to the video device 1 (compared to video and audio). A signal is sent. On the other hand, when transmitting information such as wideband video and audio from the video equipment 2 to the video equipment 1 in the downstream direction, a narrowband control signal is sent from the video equipment 1 to the video equipment 2. Therefore, the transmission rate in the direction of transmitting wideband video and audio among the uplink and the downlink is increased, while the transmission rate in the direction of transmitting the narrowband control signal is decreased. As described above, in this embodiment, information and signals in different bands are transmitted between a plurality of different video devices in the upstream and downstream, so that a video signal that requires a wide band to transmit and a narrowband However, the control signal may be used in a limited frequency band at the same time, so that the use efficiency of radio waves can be improved. The control signal is not transmitted from only one device, but is transmitted from the opposite device as needed.

  FIG. 7 is a configuration diagram of the first embodiment when the video display device 200 and the video equipment 100 are connected wirelessly. In FIG. 7, for convenience of explanation, components other than the input / output interface 210 and the interface 172 are not shown. As described above, the bidirectional interface for connecting the video devices is not limited to the wired cable, and the bidirectional interface may be configured wirelessly. In this case, the degree of freedom of arrangement of each device increases.

  FIG. 8 is an explanatory diagram when the video device 100 and the video display device 200 are connected wirelessly. In FIG. 8, the video equipment 100 and the video display device 200 are the same as those described in FIGS. For simplification of description, in FIG. 8, only the interface circuit 172 is described as the configuration requirements of the video equipment 100, and other configuration requirements are not illustrated. Further, only the input / output interface 210 is described for the video display device 200, and other configuration requirements are not shown. Here, the interface circuit 172 and the input / output interface 210 are both bidirectional interfaces, and the transmission rate is asymmetric between upstream and downstream as in the above example. In FIG. 8, between the antennas 81 and 84 and between the antennas 82 and 85 are channels for bidirectional transmission of video signals, audio signals, and control signals indicating copyright protection and copy restriction conditions for the contents, respectively. On the other hand, the channel between the antennas 83 and 86 is for transmitting an inter-device control signal. The bit selection circuits 811 and 812 are supplied with a video signal, an audio signal, a control signal indicating copyright protection and copy restriction conditions of content, and an inter-device control signal. As for the above-described modulation / demodulation method, the QPSK modulation / demodulation method is more resistant to transmission errors than the 64QAM modulation / demodulation method. On the other hand, with regard to transmission efficiency, the 64QAM modulation / demodulation scheme is more efficient than the QPSK modulation / demodulation scheme. Here, a case will be described in which a video and audio and a control signal indicating copyright protection and copy restriction conditions of content related to the video and audio are transmitted from the video device 100 to the video display device 200. Here, the direction in which information is transmitted from the video device 100 to the video display device 200 is assumed to be upstream, and conversely, the direction in which information is transmitted from the video display device 200 to the video device 100 is downward.

  In order for the video equipment 100 to transmit information, first, a carrier wave detection circuit (not shown) checks whether the used channel is already occupied by another equipment. This carrier wave detection is performed by detecting whether a carrier wave exists in a predetermined frequency band for a predetermined period. When the carrier wave detection circuit detects that another device is using the channel, it waits for a while and checks the channel availability again. Thereafter, when it is detected that the channel is not used by another device, the microprocessor 115 of the video device 100 is notified that the channel is free. The microprocessor 115 outputs a channel use request signal from the QPSK modulation / demodulation circuit 803 as an inter-device control signal, and secures the right to use the channel. Next, the microprocessor 115 outputs a transmission request signal to the bit selection circuit 811. The error control circuit 843 adds an error control bit for error detection / correction to the transmission request signal and sends it to the QPSK modulation / demodulation circuit 803. The QPSK modulation / demodulation circuit 803 performs QPSK modulation and transmits a radio signal to the video display device 200 via the antenna 83. On the other hand, the video display apparatus 200 performs QPSK demodulation on the radio signal received by the antenna 86 by the QPSK modulation / demodulation circuit 806, and outputs an inter-device control signal by performing error detection / correction control by the error control circuit 847 to select bits. Tell to circuit 812.

  The microprocessor in the video display device 200 decodes the received inter-device control signal and, together with the transmission request signal from the video device 100, device category information regarding the video device 100 (category such as whether it is a display device or a recording device). And the device identification number of the video device 100 are received. Since the display screen of the video display device 200 displays whether or not to connect to the video device 100, the user uses an input device such as a remote controller of the video display device 200 based on this display. To instruct the connection. Thereafter, the device category information, the identification number for identifying each device, and the like are exchanged between the video device 100 and the video display device 200, and the copyright protection of the content and the copy restriction conditions are observed. If there is no problem, mutual connection is permitted. Here, if each device is an input-only device, an output-only device, or if there is no point in connecting, or if it violates the copyright protection or copy restriction conditions of the content, the connection process is performed. Canceled and a message to that effect is displayed on each device. The following describes the case where there is no problem with the copyright protection and copy restriction conditions of the content.

  Of the video signal, the audio signal, and the control signal indicating the copyright protection or copy restriction conditions of the content related to the video signal, the audio signal and the control signal indicating the copy restriction condition, 2 bits are selected from the MSB of the video signal. On the other hand, the error control circuit 841 adds control bits for error detection / correction, and sends them to the QPSK modulation / demodulation circuit 801. The QPSK modulation / demodulation circuit 801 performs QPSK modulation on this signal and transmits a radio signal from the antenna 81. The remaining bits from the third bit to the eighth bit are added with error detection / correction control bits by the error control circuit 842 and sent to the 64QAM modulation / demodulation circuit 802. Then, the 64QAM modulation / demodulation circuit 802 performs 64QAM modulation on this signal and transmits a radio signal from the antenna 82.

  In the video display device 200, the QPSK modulation / demodulation circuit 804 performs QPSK demodulation on the signal received by the antenna 84, performs error control by the error control circuit 845, and then transfers the upper 2 bits of the video signal to the bit control circuit 812. Output. The 64QAM modulation / demodulation circuit 805 performs 64QAM demodulation on the remaining signal received by the antenna 85, performs error control by the error control circuit 846, and outputs the result to the bit control circuit 812.

  Here, the inter-device control signal will be described. The inter-device control signal is modulated by the QPSK modulation / demodulation circuit 806 from the bit selection circuit 812 via the error control circuit 847 when the signal is transmitted from the video display device 200 to the video device 100 in the downstream direction. Output from. The video equipment 100 receives this signal by the antenna 83, performs QPSK demodulation by the QPSK modulation / demodulation circuit 803 via the QPSK modulation / demodulation circuit 83, performs error detection / correction by the error control circuit 843, and then performs a bit selection circuit 811. Transmit to. On the other hand, when the inter-device control signal is transmitted in the upstream direction, that is, when a signal is transmitted from the video device 100 to the video display device 200, the signal is modulated from the bit selection circuit 811 via the error control circuit 843 by the QPSK modulation / demodulation circuit 803. Output from the antenna 83. The video display apparatus 200 receives this signal by the antenna 86, performs QPSK demodulation by the QPSK modulation / demodulation circuit 806, performs error detection / correction by the error control circuit 847, and then transmits the signal to the bit selection circuit 812. By doing so, there is an effect that malfunctions are reduced even in a noisy environment with respect to an inter-device control signal that is important in constructing a system.

  In the configuration of this embodiment, it is possible to perform transmission with excellent noise resistance performance although the transmission rate is low for the upper 2 bits of the digital signal. That is, taking advantage of the fact that the higher order bits of the video signal have a greater effect on the image quality, two bits are extracted in order from the MSB of the video signal, and a transmission path using QPSK modulation is assigned to these pieces of information. Is to reduce the deterioration of the material. By the way, in a system in which audio information is more important than video, it is possible to assign an important (for example, upper) 2 bits of an audio signal to a transmission path using QPSK modulation.

  Furthermore, when a human recognizes an image, there is a tendency that a high frequency component is relatively unattractive with respect to a low frequency component with respect to a frequency component in the horizontal direction of the screen and a frequency component in the vertical direction of the screen. In addition, among the moving objects in the screen, there is a tendency that the human eye is not attached to a fast movement. By utilizing these tendencies, the horizontal direction of the screen may be divided into a low frequency component and a high frequency component, QPSK modulation may be used for the low frequency component, and 64 QAM modulation may be used for the high frequency component. By doing so, it is possible to increase noise resistance against important information within a limited transmission band and to secure the entire transmission capacity. Similarly, the vertical direction of the screen may be divided into a low-frequency component and a high-frequency component, QPSK modulation may be used for the low-frequency component, and 64QAM modulation may be used for the high-frequency component. By doing so, it is possible to increase noise resistance against important information within a limited transmission band and to secure the entire transmission capacity. Furthermore, it is possible to combine the handling of frequency components with respect to the horizontal direction of the screen and the handling of frequency components with respect to the vertical direction to increase noise resistance against desired important information.

  In the above description, the error control circuits 841, 842, 843 have been described as adding error control information to the respective bits input to the error control circuits 841, 842, 843, but the error control circuits 841, 842 are described. , 843 may be treated as a single word and error control information may be added to the single word. With this configuration, the error control circuit becomes simple and easy to configure.

  Using the configuration of FIG. 8, a plurality of still images specifically captured by the video device 100 can be switched every second, transmitted to the video display device 200, and displayed on the video display device 200. From the video display device 200, a signal serving as a trigger for sending an image to the video device 100 is sent, and based on this trigger signal, the video device 100 switches a still image and sends a new still image to the video display device 200. To transmit. With this configuration, when an image cannot be reproduced on the video display device 200, it is possible to repeat the process until the image is correctly received by sending the trigger signal to the video device 100 again. Also in this case, since the control signal uses QPSK modulation, the noise resistance is excellent.

  In the embodiment shown in FIG. 8, the details of the encryption process are not described, but the encryption circuit 171 and the interface circuit 172 can be combined to perform the process as shown in FIG. FIG. 9 shows an example of a configuration for performing encryption processing in the system shown in FIG. 8. The system of FIG. 9 includes encryption / decryption circuits 821 to 826 and interface circuits 830 and 831 including encryption processing. , Error control circuits 841, 842, 843, 845, 846, 847 are included.

  In the example shown in FIG. 9, as in the example of FIG. 8, a predetermined bit is selected by the bit selection circuit 811, and each bit is subjected to error control by the error control circuits 841 and 842, and then the encryption / encryption / decryption circuit 821. , 822, and input to the QPSK modulation / demodulation circuit 801 and 64QAM modulation / demodulation circuit 802. The signals demodulated by the QPSK modulation / demodulation circuit 804 and the 64QAM modulation / demodulation circuit 805 are input to the encryption / encryption / decryption circuits 824 and 825, respectively decrypted and then synthesized by the bit selection circuit 812. By performing processing in this manner, signal processing according to importance can be performed, and important information is less likely to be erroneous. Therefore, image quality deterioration can be reduced and transmission can be performed efficiently.

  Further, by combining a reversible code with the encryption / decryption circuits 821 to 826, transmission with higher efficiency is possible. For example, in the example shown in FIG. 9, before performing encryption processing by the encryption / decryption circuits 821 to 823, for example, after reducing bits to be transmitted by a reversible arithmetic code using statistical properties, encryption is performed. . In the video display device 200, after encryption / decryption by the encryption / decryption circuits 824 to 826 is performed, lossless codes corresponding to the encryption / decryption circuits 821 to 823 are decrypted, and then error detection is performed by the error control circuits 845 to 847. Correction is performed, and bit selection circuit 812 performs bit composition. By combining the lossless codes, the transmission rate of information to be transmitted can be reduced, so that transmission can be performed more efficiently.

  Further, a supplementary explanation will be given regarding encryption. If all the encryption circuits are processed using the AES 128-bit encryption process, it is possible to perform a protection process with a high degree of safety. In addition, when AES 128-bit encryption processing is used for the content encryption circuit 821 and DES encryption processing is used for the other encryption circuits, the balance between content protection important for the system and processing efficiency is achieved. It is easy to configure the system.

  Furthermore, the baseband signal transmission and the compressed signal transmission may be switched according to the inter-device control signal. With this configuration, when a compressed signal is transmitted in response to a request for content protection or the like, transmission using QPSK modulation enables transmission with excellent error tolerance on the transmission path. Also, when transmitting a baseband signal, transmission with high transmission efficiency is possible by 64QAM modulation.

  The operations of the video device 100 and the video display device 200 in FIG. 9 are basically the same as the operations of the video device 100 and the video display device 200 in FIG. In order for the video equipment 100 to perform transmission, first, a carrier wave detection circuit (not shown) is used to check whether or not the used channel is already occupied by another equipment. This carrier wave detection is performed by detecting whether or not a carrier wave exists in a predetermined frequency band for a predetermined period. When the carrier wave detection circuit detects that another device is using the channel, it waits for a while and checks the channel availability again. Thereafter, when it is detected that the channel is not used by another device, the microprocessor 115 of the video device 100 is notified that the channel is free. The microprocessor 115 outputs a channel use request signal from the QPSK modulation / demodulation circuit 803 as an inter-device control signal, and secures the right to use the channel. Next, the microprocessor 115 outputs a transmission request signal to the bit selection circuit 811.

  The error control circuit 843 adds an error control bit for error detection / correction to the transmission request signal, encrypts it by the encryption / decryption circuit 823, and sends it to the QPSK modulation / demodulation circuit 803. The QPSK modulation / demodulation circuit 803 performs QPSK modulation and transmits a radio signal to the video display device 200 via the antenna 83. On the other hand, the video display apparatus 200 performs QPSK demodulation on the radio signal received by the antenna 86 by the QPSK modulation / demodulation circuit 806, and decrypts it by the encryption / decryption circuit 826. The error control circuit 847 performs error detection / correction control on the decoded signal, thereby outputting an inter-device control signal and transmitting it to the bit selection circuit 812. The microprocessor in the video display device 200 decodes the received inter-device control signal and, together with the transmission request signal from the video device 100, device category information regarding the video device 100 (category such as whether it is a display device or a recording device). And the device identification number of the video device 100 are received. Since the display screen of the video display device 200 displays whether or not to connect to the video device 100, the user uses an input device such as a remote controller of the video display device 200 based on this display. To instruct the connection. Thereafter, the device category information, the identification number for identifying each device, and the like are exchanged between the video device 100 and the video display device 200, and the copyright protection of the content and the copy restriction conditions are observed. If there is no problem, mutual connection is permitted. Here, if each device is an input-only device, an output-only device, or if there is no point in connecting, or if it violates the copyright protection or copy restriction conditions of the content, the connection process is performed. Canceled and a message to that effect is displayed on each device. In this way, when there is no problem with the copyright protection and copy restriction conditions of the content, connection is made, and video, audio, and the like are transmitted from the video device 100 to the video display device 200.

  FIG. 5 is a diagram showing another configuration of the video display apparatus 200 shown in FIG. 1 according to the second embodiment of the present invention. FIG. 5 is partially the same as the embodiment shown in FIG. 4, and common portions are denoted by the same reference numerals and detailed description thereof is omitted. 5 includes an encryption / decryption circuit 212, encryption / decryption circuits 245 and 290, compression / transcoding circuits 291 and 292, and a replication control circuit 293 that is a multiplexing circuit.

  In the embodiment shown in FIG. 5, when a baseband signal is input from the terminal 201 or the terminal 202, the operation is the same as in the embodiment shown in FIG. The compression / transcoding circuits 292 and 291 operate as compression circuits for baseband signals. When a compressed signal is input from the terminal 201 or the terminal 202, the encryption required for transmission is decrypted by the encryption / decryption circuit 212 via the input / output interface 210, and the video signal compressed by the demultiplexing circuit 250 Separated into compressed audio signals. Each signal is input to the duplication control circuit 290, and whether or not duplication is possible is determined from information indicating whether or not duplication is possible. If duplication is possible, the compression / transcoding circuits 291 and 292 reduce the bit rate of the compressed video signal and the compressed audio signal as necessary by using a compression method with higher compression efficiency. The The output signals of the compression / transcoding circuits 291 and 292 are multiplexed by the multiplexing circuit 293 and input to the encryption / encryption / decryption circuit 245. Here, when it is detected by the copy control circuit 290 that copying is permitted, the encryption / decryption circuit 245 appropriately performs encryption processing for storage on the input signal, and stores it. Store in device 230 and / or memory 221. When the stored signal is reproduced, the reproduction signal from the storage device 230 and the memory 221 is decrypted by the encryption / decryption circuit 245 and separated into a video signal and an audio signal by the demultiplexing circuit 241. From this point onward, it can be processed and viewed in the same manner as described above. Even when viewing while accumulating in the storage device 230 or the memory 221, the signal from the multiplexing circuit 293 is input to the demultiplexing circuit 241 via the encryption / decryption circuit 245 and processed in the same manner. In this case, the transcoded image quality can be confirmed. In the case of direct viewing without accumulation, a signal is input from the encryption / decryption circuit 212 to the demultiplexing circuit 241 via the encryption / decryption circuit 245, where it is separated into a video signal and an audio signal, and so on. To be processed.

  In the embodiment shown in FIG. 5, even when a compressed signal is input, by performing transcoding, it is possible to efficiently accumulate at a higher compression rate. In the present embodiment, an example in which the compression circuits 111 and 113 and the signal processing means are implemented by a circuit is shown. However, various circuit elements may be configured by software means to perform the above-described processing, and even in this case, the same effect can be obtained. The present invention does not limit how signal processing is implemented.

The figure which shows embodiment of this invention. The figure which shows an example of the video equipment 100 which concerns on embodiment of this invention. It is explanatory drawing which showed the order of the compression signal process. The figure which shows an example of the video display apparatus 200 which concerns on embodiment of this invention. The figure which shows the other example of the video display apparatus 200 which concerns on embodiment of this invention. The figure which shows an example of the system which connected two video equipments. The figure which shows an example of the system which connected the image display device and the image equipment The figure which shows an example of the system which wirelessly connected two video equipments. The figure which shows the other example of the system which wirelessly connected two video equipments.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Video equipment 121,221,321 Memory 122,222 Wireless interface 110 Imaging device 111,113,281,282,291,292 Compression circuit 112 Microphone 114 Sensor 116,170,283,293 Multiplexing circuit
124, 150, 151, 224, 251, 252 Signal processing circuit 130, 230 Storage device 140, 240, 245 Encryption / decryption circuit 141, 250, 241 Inverse multiplexing circuit 142, 143, 242, 243 Decompression circuit 160 Display device 161 270 Audio output device 171 Cryptographic circuit 180 Broadcast receiver 200 Video display device 211, 212 Cryptographic decryption circuit 260 Display 280 Replication control circuit 300 Receiver

Claims (5)

An input unit capable of inputting encrypted compressed video information and encrypted first baseband video information;
An encryption / decryption unit for decrypting encryption of the compressed video information and the first baseband video information input from the input unit;
A decompression unit for decompressing the compressed video information decrypted by the encryption / decryption unit to obtain second baseband video information;
A display unit for displaying at least one of the first baseband video information decrypted by the encryption / decryption unit and the second baseband video information from the decompression unit;
A display device comprising:   The display device further includes a compression unit that compresses the decoded first baseband video information, and a storage unit, and the storage unit includes first baseband video information compressed by the compression unit, and The display device according to claim 1, wherein at least one of the compressed video information combined by the encryption composite unit can be stored.   3. The display according to claim 2, wherein the compression unit converts the bit rate of the compressed video information combined by the encryption / decryption unit so that the bit rate is lower than the bit rate of the compressed video information. apparatus. The compressed video information input from the input unit includes rotation information when the video information is displayed, and the display device further includes a rotation processing unit for video information expanded by the expansion unit according to the rotation information. Have
The display device according to claim 1, wherein the display unit displays the video information rotated by the rotation processing unit. The input unit includes a first demodulation circuit corresponding to a first demodulation method, and a second demodulation circuit corresponding to a second demodulation method,
The first bit information in the first baseband video information input to the input unit is demodulated by the first demodulation circuit,
Second bit information having a lower priority than the first bit information in the first baseband video information input to the input unit is demodulated by the second demodulation circuit,
2. The first bit information, which is an output of the first demodulator circuit, and second bit information, which is an output of the second demodulator circuit, are combined and supplied to the encryption complex unit. The display device described.

Images