JP7187638B2 - Display device - Google Patents

Description

The present invention relates to a technique for displaying video information from video equipment connected to a display device via an interface on the display device.

2. Description of the Related Art A method of transmitting a video signal and an audio signal through an analog connection has been used in order to connect a video device and a video display device, which is another video device, to view a video or the like. However, with the spread of digital equipment, a method of making a digital connection and encrypting and transmitting a video signal and an audio signal is used from the viewpoint of preventing deterioration of image quality and protecting copyright.

As an example of digital transmission, one using a single cable conforming to the IEEE1394 standard is known. In this system, mutual authentication is performed between transmitting and receiving devices, and after the authentication, a video signal and an audio signal are multiplexed, and the multiplexed data is subjected to cryptographic processing called DTCP and transmitted.

Another known example is the HDMI system. In the HDMI system, a baseband signal of a high-definition video signal and an audio signal are time-division multiplexed, and an encryption process called HDCP is performed to enable transmission.

A conventional technique for multiplexing and transmitting a digitized video signal and an audio signal is disclosed, for example, in Japanese Unexamined Patent Application Publication No. 2002-200010.

JP-A-2002-232377

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 containing a large amount of information cannot be transmitted as it is in the form of a baseband signal. Therefore, in the IEEE 1394 standard, there is a problem that the baseband signal must be compressed and transmitted at a reduced transmission rate. On the other hand, in the HDMI system, no consideration is given to recording the received signal by a device that receives a transmitted high-definition video signal.

In addition, all of these methods are based on the premise of connection between stationary devices placed in the home, and it is not suitable for convenient connection between portable devices such as digital cameras and mobile phones and image display devices. Consideration was not enough.

The present invention has been made in view of such problems, and is a technique for improving convenience when displaying images obtained by portable video equipment such as cameras and mobile phones on a display device. It provides

In the present invention, a video acquisition request for acquiring the video information from the external video device is transmitted to the external video device connected to the display device via a predetermined interface at predetermined intervals. is characterized in that a plurality of pieces of video information can be acquired from the external device and displayed.

A plurality of images obtained in this manner may be displayed in a so-called slide show format, for example, by switching and displaying them at predetermined intervals. Also, a plurality of thumbnail images may be generated from the plurality of pieces of video information and displayed side by side on one screen of the display section.

Advantageous Effects of Invention According to the present invention, it is possible to improve convenience when displaying an image obtained by a portable image device such as a camera or a mobile phone on a display device.

1 is a diagram showing an example of a system including video equipment and a video display device according to an embodiment of the present invention; FIG. The figure which shows an example of the video equipment 100 which concerns on embodiment of this invention. FIG. 4 is an explanatory diagram showing the order of compressed signal processing; The figure which shows an example of the video display apparatus 200 which concerns on embodiment of this invention. FIG. 4 is a diagram showing another example of the image display device 200 according to the embodiment of the present invention; The figure which shows an example of the system which connected two video devices. A diagram showing an example of a system in which a video display device and video equipment are connected The figure which shows an example of the system which wirelessly connected two video devices. FIG. 10 is a diagram showing another example of a system in which two video devices are wirelessly connected; 1 is a diagram showing an embodiment of a video display device according to the present invention; FIG. The figure which shows the other Example of the video display apparatus which concerns on this invention. FIG. 4 is a diagram showing an example of thumbnail display in the embodiment; FIG. 11 is a diagram showing another example of thumbnail display in the embodiment; FIG. 11 is a diagram showing another example of thumbnail display in the embodiment; FIG. 4 is a diagram showing an example of attribute information corresponding to each still image stored in the memory 1018 of the video equipment 1020; FIG. 2 is a diagram showing a configuration example of an HDMI interface; The figure which shows an example of the format of a remote control code. FIG. 4 is a diagram showing an example of a method of transmitting a remote control code through a CEC line; 4 is a diagram showing an example of a table of maker codes and device codes corresponding to each interface stored in the video display device 200; FIG.

Preferred embodiments of the present invention are described below with reference to the drawings.

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

In this embodiment, the portable video equipment 100 is specifically a digital camera, a video camera, a mobile phone, a game machine, a personal media player, or the like. Although the components required for each form are not necessarily the same, the embodiment shown in FIG. 1 mainly describes the components required for input/output with the outside.

In FIG. 1, the base station antenna 20 of the mobile phone and the antenna 102 of the video equipment 100 transmit and receive signals. When the video equipment 100 is used as a mobile phone, signal processing is performed as in a normal mobile phone. The video equipment 100 can also receive content such as movies transmitted from the base station antenna 20 of the mobile phone. In this case, the content can be viewed on the display device and audio output device built into the video equipment 100, or viewed on a large screen on the external video display device 200 via the terminal 101, the connection cable 10, and the terminal 201. can also Furthermore, while viewing the content or in order to view the content later, the content is recorded in a storage medium built into 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 on the video equipment 100 or stored in a storage medium (not shown) built into the video equipment 100 . ), or on a connected storage medium (eg, memory 121). Furthermore, it can be viewed on the video display device 200 via the terminal 101 , the connection cable 10 and the terminal 201 .

A program broadcast from the broadcast transmitting tower 30 is received by a receiving antenna 310 connected to the receiver 300, input to the receiver 300 via an antenna terminal 302, and subjected to appropriate signal processing. , the connection cable 11 and the terminal 202 are viewed on the video display device 200 . At the same time as viewing or separately from viewing, the selected program 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) incorporated in the video device 100, the program recorded at home can be viewed outside the home.

Furthermore, by installing the image pickup device 110 and the microphone 112 in the video equipment 100, it is possible to shoot still images and moving images along with sound, and store them in an appropriately built-in storage medium (not shown) or the memory 121. . Video and audio stored in the built-in storage medium and 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 connection cables 10 and 11, respectively. It shows the case when However, when signals are transmitted and received between these video devices, there is no need to use a wired cable for connection, and a wireless connection may be used. Wireless connection eliminates the troublesomeness of wiring and the arrangement of wiring. Using a connection cable has the advantage of being more resistant to interference such as noise than wireless connection.

FIG. 2 shows a 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 captures a moving image or still image input through an optical system and converts it into an electrical signal. In the compression circuit 111, in the case of moving images, for example, MPEG2, MPEG4, AVC/H. H.264 or the like, and in the case of a still image, for example, a compression method such as JPEG is used to efficiently bit-compress the captured image.

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

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

Bit-compressed video signals and audio signals from the compression circuits 111 and 113 and various information from the microprocessor 115 are input to the multiplexing circuit 116 and multiplexed according to a predetermined format. When a still image is shot, the audio signal is not normally captured, but the audio signal may be multiplexed in accordance with the 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 others.

FIG. 3 is a diagram showing the order of signal processing for each block generally performed in image compression. As shown in FIG. 3A, signal processing is performed sequentially from left to right in the upper stage of the image, and then signal processing is performed sequentially from left to right in the second stage. As shown in FIG. 3B, when the video equipment 100 is vertically positioned with the right side up, signal processing is performed from the bottom to the top of the left column, then from the bottom to the top of the second column from the left. As shown in (c) of FIG. 3, when the left side of the video equipment 100 is vertically oriented, signal processing is performed from top to bottom in the right column and then from top to bottom in the second column from the right. .

If the camera is oriented vertically at the time of photographing, it is impossible to display the photographed image on the display device as it was photographed without information as to whether the left or right side is facing upward. For this reason, position information is multiplexed as various information from the microprocessor 115 with the video signal and the audio signal as described above. By decompressing the compressed signal and performing signal processing for rotating the decompressed image by 90 degrees using the position information in accordance with the output of the display device, the image can be displayed as it was shot.

Also, instead of multiplexing the positional information, the microprocessor 115 gives the positional information 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. As a result, the compression circuit 111 performs the compression signal processing itself according to the shooting operation of the video and the shooting position of the video equipment 100, thereby eliminating the need for rotation processing during playback. For example, as shown in (d) and (e) of FIG. 3, based on the position information, compression signal processing can be performed from the top left to the right of the image at the time of shooting, and then from the left to the right of the second stage. can be displayed as it was shot during playback.

If the video equipment 100 can shoot both still images and moving images, the still images are shot in the horizontal position or in the vertical position, as described above. Similarly, there are users who consider using the video equipment 100 in the vertical position even when shooting moving images.

In the case of a moving image, rotation signal processing is generally not prepared, and if the image is displayed as it is on the image display device 200, the image will be rotated horizontally, resulting in unintended shooting for the user. .
Therefore, when the user rotates the video equipment 100 for use in moving image mode, the sensor 114 detects that the video equipment 100 is used in the vertical position, and the microprocessor 115 sends a message to the display device 160 to draw attention. display. The display device 160 is used as a monitor for the image picked up by the imaging device 110, so that the user can easily check the message while taking the picture, and if the user does not intend to take the picture in the normal horizontal 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 performs compression signal processing, for example, as shown in (d) and (e) of FIG. Compressed signal processing is performed from left to right in the upper row. As a result, it is possible to view images in the vertical position even on current televisions. A detailed description thereof 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 a storage device, for example, a hard disk device, an optical disk device, a semiconductor memory device, or the like can be used. , the price should be taken into consideration when deciding. It can also be stored in the memory 121 via the signal processing circuit 124 and memory interface 120 .

As for the information photographed by an individual, since the person who took the photograph has the copyright, normally, encryption is unnecessary when the information is stored. However, since there is a possibility that the medium stored in the storage device 130 is lost, the output signal of the multiplexing circuit 116 is encrypted by the encryption/encryption/decryption circuit 140 and then stored in the storage device 130 or the memory 121. Safety can be improved.

In some cases, the video equipment 100 is compatible with removable memory, or has a mobile phone function or a wireless LAN function. A memory interface 120 is an interface for a removable memory 121. Still images, moving images, and audio contents are recorded in the memory 121 by another device, and connected to the interface 120, so that the signal processing circuit 124, encryption/encryption It can be recorded in the storage device 130 via the decoding circuit 140 .

At this time, the signal processing circuit 124 detects whether or not the content recorded in the memory 121 is copyright-protected and copying is restricted. Go to 130.

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

When reproducing and viewing the content stored in the storage device 130, the user selects the content to be viewed using an input key or a remote controller (not shown), and the selected content is read out from the storage device 130 and encrypted. /Decryption is performed by the encryption/decryption circuit 140, and the signal is separated into a video signal and an audio signal by the demultiplexing circuit 141.

When the broadcast receiver 180 receives a broadcast, the encryption/encryption/decryption circuit 140 deciphers the encryption for the broadcast, and if necessary, the encryption/encryption/decryption circuit 140 also performs encryption processing for storage. and record it in the storage device 130 and the memory 121 . When the received broadcast is viewed directly, the inverse multiplexing circuit 141 separates the video signal and the 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 expansion circuit 143 and output to audio output device 161 . Thus, since the video equipment 100 has the display device 160 and the audio output device 161, it is possible to view the content as it is without connecting the video display device to the outside. It should be noted that if there is a difference in the time required for decompression processing of the video signal and the audio signal, or if there is a time difference in video display, audio output, etc. due to the presence or absence of scanning line conversion processing, a sense of incongruity will occur. In particular, it takes time to process the video signal, and if the audio signal precedes the video signal, a sense of incongruity is increased. As a result, it is possible to eliminate the sense of discomfort caused by the deviation between the video signal and the audio signal.

On the other hand, when viewing a video signal and an audio signal on the external video display device 200, the scanning lines that can be supported by the video display device 200 are checked, and if they match the scanning lines of the video signal to be displayed, If it is different, the signal processing circuit 150 converts it into the necessary scanning lines, and then the multiplexing circuit 170 time-multiplexes it with the audio signal processed by the signal processing circuit 151 . The signal processing circuit 151 compresses the audio signal on the time axis during a period corresponding to the blanking period of the video signal, and performs time adjustment for lip-sync matching as necessary. The video signal and audio signal multiplexed by the multiplexing circuit 170 are input to the encryption circuit 171, perform encryption processing necessary for transmission between the video equipment 100 and the video display device 200, and pass through the interface 172 and the terminal 101. Output to the video display device 200 .

As described above, in spite of moving images, when the video equipment 100 is used in the vertical position and the signal processing is performed as shown in (d) and (e) of FIG. Scanning line conversion is performed in processing 150 to convert the number of scanning lines that can be captured by the image display device 200 and output. In that case, there are portions on the left and right sides of the screen where no signal is projected. It is displayed on the display device 160 in a so-called side panel state.

When the signal output from the terminal 101 is stored at the receiver, the compressed signal is output without decompression. In this case, the compressed signal from the encryption/encryption decoding circuit 140 is input to the encryption circuit 171 , encrypted for transmission, 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 wireless interface 122 are once recorded in the storage device 130 and then reproduced. made it However, if storage is not required or direct viewing is desired, the demultiplexing circuit 141 may perform processing without performing encryption or decryption processing for storage in the encryption/decryption circuit 140 . By doing this, the display device 160 and the audio output device 161 built in the video equipment 100 can be used to view video and audio, or can be viewed on a receiver connected to the outside via the output interface 172. it becomes possible to

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

First, the case where the signal input from terminal 201 or terminal 202 is a baseband signal of uncompressed moving image will be described. A signal input from terminal 201 or terminal 202 is input to encryption/decryption circuit 211 via 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 encrypted/decrypted signal is input to the demultiplexing circuit 250, and the video signal and 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 according to the number of displayable pixels of the display 260 . The signal processing circuit 252 expands the time axis of the audio signal time-axis compressed and multiplexed with the blanking of the video signal, and performs lip-sync matching, sound quality adjustment, etc., as necessary. Output signals from the signal processing circuits 251 and 252 are input to a display 260 and an audio output device 270, respectively, and viewed.

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

A signal input from terminal 201 or terminal 202 is input to encryption/decryption circuit 211 via 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 encrypted/decrypted signal is input to the encryption/encryption/decryption circuit 240 . The encryption/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 a compressed signal input from terminal 201 or terminal 202 is stored and viewed, first, a signal corresponding to the compressed signal decrypted by encryption/decryption circuit 211 is demultiplexed from encryption/decryption circuit 240. Input to circuit 241 . Subsequently, the demultiplexing circuit 241 separates the compressed video signal and audio signal. The separated video and audio signals are expanded by expansion circuits 242 and 243, respectively, returned to the baseband, and then input to signal processing circuits 251 and 252, respectively. In the same way, it is input to the display 260 and the audio output device 270 and viewed.

When reproducing and viewing the content stored in the storage device 230, the title of the content stored in the storage device 230 is displayed on the display 260, selected, and the signal of the selected content is sent to the storage device 230. to the encryption/decryption circuit 240. The encryption/decryption circuit 240 decrypts the signal of the selected content, inputs it to the demultiplexing circuit 241, and performs the same processing thereafter, so that it can be viewed.

Similarly, content stored in the memory 221 can also be reproduced. In the same way as the content stored in the storage device 230 is reproduced, the content to be viewed is selected from the content stored in the memory 221, and the selected content is transmitted through the memory interface 220 and the signal processing circuit 224 to the encryption/decryption circuit 240. to enter. The signal processing circuit 224 performs processing necessary to read out the content from the memory 221 , and inputs the compressed and multiplexed video and audio signals to the encryption/decryption circuit 240 . Subsequent signal processing is the same as when content is read from the storage device 230 .

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

Similar processing is performed when viewing or storing contents transmitted wirelessly. Compressed contents sent wirelessly are input to the encryption/decryption circuit 240 via the wireless interface 222 and the signal processing circuit 224 . The encryption/decryption circuit 240 decrypts the code of the encryption processing required for wireless transmission. The subsequent processing is the same as the processing during playback from the storage device 230 .

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

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

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

Up to this point, the present embodiment has mainly been described with respect to the case where the video signal and the audio signal output from the video equipment 100 are transmitted to the video display device 200 . Furthermore, in this embodiment, a case where two video devices 100 are connected to each other will be described with reference to FIG. In FIG. 6, both the video equipment 1 and the video equipment 2 are configured by a portable video equipment 100 such as a mobile phone or a digital camera. 10. With this configuration, contents such as movies received by the video equipment 1 from the base station antenna 20 of the mobile phone are transmitted to the video equipment 2 via the connection cable 10, and then transmitted to the video equipment 2. It is possible to display using the display device 160 of the video equipment 2 and output audio using the audio output device 161 in the video equipment 2 . Also, when transmitting the content stored in the storage device 130 in the video equipment 1, based on the contents of the control signal from the video equipment 2, the desired content is read out from the storage device 130 and encrypted/decrypted. The cipher is decrypted in circuit 140 . Then, in the cryptographic circuit 171 , after performing cryptographic processing required for transmission to the outside, the data is output via the interface 172 and the terminal 101 . At this time, the control signals from the video equipment 2 include mutual authentication for confirming that the video equipment 1 and the video equipment 2 are authorized devices, a synchronization control signal for synchronizing signal processing, A transmission request signal, an identification signal indicating that it is the video equipment 1, and the like are used. Note that the control signal is also transmitted from the video device 1 to the video device 2 as necessary.

The signals transmitted and received between the video devices 1 and 2 are not limited to signals received from the base station antenna 20 of the mobile phone as described above, but also signals received by the broadcast receiver 180 as broadcast waves and stored signals. Content stored on the device 130 or content on the memory 121 may be used.

The video equipment 1 and the video equipment 2 are, for example, the same video equipment 100 . These video devices are connected to each other via a bi-directional interface as described above. Information such as video and audio may be sent from the video device 1 to the video device 2 , but it is also possible to send information such as video and audio 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 defined 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 called "up" and "down", respectively. The two-way interface that connects the video equipment 1 and the video equipment 2 has an asymmetrical transmission rate between upstream and downstream, that is, the transmission rates are different from each other. Then, in the upstream direction, that is, when transmitting information such as wideband video and audio from the video equipment 1 to the video equipment 2, narrowband control is performed from the video equipment 2 to the video equipment 1 (compared to video, audio, etc.). signal is sent. Conversely, in the downstream direction, that is, when information such as wideband video and audio is sent from the video equipment 2 to the video equipment 1 , a narrowband control signal is sent from the video equipment 1 to the video equipment 2 . Therefore, of the uplink and downlink, the transmission rate in the direction of transmitting wideband video and audio is increased, while the transmission rate in the direction of transmitting narrowband control signals is decreased. In this way, in this embodiment, information and signals in different bands for uplink and downlink are transmitted between a plurality of different video devices. However, the control signal can be used simultaneously in a limited frequency band. Note that the control signal is not only transmitted from one device, but is also transmitted from the device on the opposite side as necessary.

FIG. 7 is a configuration diagram in which the image display device 200 and the image equipment 100 are wirelessly connected in the first embodiment. In FIG. 7, only the input/output interface 210 and the interface 172 are not shown for simplification of explanation. In this way, the bidirectional interface for connecting video devices is not limited to a wired cable, and a wireless bidirectional interface may be used. In this case, the degree of freedom in arranging each device increases.

FIG. 8 is an explanatory diagram when the video equipment 100 and the video display device 200 are wirelessly connected. In FIG. 8, a video equipment 100 and a video display device 200 are the same as those described in FIGS. 1 and 2, respectively. For simplification of explanation, FIG. 8 shows only the interface circuit 172 as a component of the video equipment 100, and does not show other components. In addition, only the input/output interface 210 of the image display device 200 is shown, and other components are not shown. Here, both the interface circuit 172 and the input/output interface 210 are bi-directional interfaces, and the transmission rates are made asymmetric between the uplink and the downlink as in the above example. In FIG. 8, channels between antennas 81 and 84 and between antennas 82 and 85 are channels for bidirectional transmission of video signals, audio signals, and control signals indicating content copyright protection and duplication restriction conditions, respectively. On the other hand, the channel between antennas 83 and 86 is for transmitting inter-device control signals.
The bit selection circuits 811 and 812 also receive input of a video signal, an audio signal, a control signal indicating content copyright protection and copy restriction conditions, and an inter-device control signal. Regarding the modulation/demodulation systems described above, the QPSK modulation/demodulation system has higher resistance to transmission errors than the 64QAM modulation/demodulation system. On the other hand, regarding transmission efficiency, the 64QAM modulation/demodulation system is more efficient than the QPSK modulation/demodulation system. Here, a case will be described where video equipment 100 sends to video display device 200 a control signal indicating copyright protection and copy restriction conditions for video, audio, and related content. Here, the direction in which information is transmitted from the video equipment 100 to the video display device 200 is defined as upstream, and conversely, the direction in which information is transmitted from the video display device 200 to the video equipment 100 is defined as downstream.

In order for the video device 100 to transmit information, first, a carrier detection circuit (not shown) checks whether or not the used channel is already occupied by another device. This carrier wave detection is performed by detecting whether or not a carrier wave exists in a predetermined frequency band for a predetermined period of time. When the carrier detection circuit detects that the channel is being used by another device, wait for a while and check the vacant state of the channel again. After that, when it detects that the channel is not used by other equipment, it notifies the microprocessor 115 of the video equipment 100 that the channel is available. The microprocessor 115 outputs a channel use request signal from the QPSK modulation/demodulation circuit 803 as an inter-device control signal to secure the right to use the channel. Microprocessor 115 then outputs a transmission request signal to bit selection circuit 811 . The error control circuit 843 adds an error control bit for error detection/correction to this transmission request signal and sends it to the QPSK modulation/demodulation circuit 803 . A QPSK modulation/demodulation circuit 803 performs QPSK modulation and transmits a wireless signal to the video display device 200 via the antenna 83 . On the other hand, the video display device 200 QPSK-demodulates the radio signal received by the antenna 86 by the QPSK modulation/demodulation circuit 806, performs error detection/correction control by the error control circuit 847, outputs an inter-device control signal, and selects bits. to circuit 812;

The microprocessor in the image display device 200 decodes the received inter-device control signal, and together with the transmission request signal from the image device 100, device category information (category such as whether it is a display device or a recording device) regarding the image device 100. ) and the device identification number of the video device 100 . The display screen of the video display device 200 displays whether or not to connect to the video device 100. Based on this display, the user can use the input device such as the remote control of the video display device 200. command to allow the connection. After that, the video device 100 and the video display device 200 exchange mutual device category information, identification numbers for identifying mutual devices, and the like, and comply with content copyright protection and copy restriction conditions. exchange of information for each other, and if there is no problem, mutual connection is permitted. Here, if the two devices are input-only devices or output-only devices, or if there is no point in connecting, or if content copyright protection or copy restriction conditions are violated, etc., connection processing should be performed. It will be stopped, and a message to that effect will be displayed on each device. In the following, the case where there is no problem with content copyright protection and copy restriction conditions will be described.

2 bits from the MSB of the video signal are selected from among the video signal, the audio signal, and the control signal indicating the copyright protection and copy restriction conditions of the content related to them, which are input to the interface circuit 172, and the 2 bits are selected. , the error control circuit 841 adds control bits for error detection/correction, and sends it to the QPSK modulation/demodulation circuit 801 . Then, the QPSK modulation/demodulation circuit 801 QPSK-modulates this signal and sends out a radio signal from the antenna 81 . The error control circuit 842 adds control bits for error detection/correction to the remaining bits from the 3rd bit to the 8th bit, and sends them to the 64QAM modulation/demodulation circuit 802 . Then, the 64QAM modulation/demodulation circuit 802 modulates this signal with 64QAM and sends out a radio signal from the antenna 82 .

In the video display device 200, the QPSK modulation/demodulation circuit 804 QPSK demodulates the signal received by the antenna 84, and the error control circuit 845 performs error control. Output. The remaining signal received by the antenna 85 is 64QAM-demodulated by the 64QAM modulation/demodulation circuit 805 , subjected to error control by the error control circuit 846 , and then output to the bit control circuit 812 .

Here, the inter-device control signal will be described. The inter-device control signal is transmitted from the bit selection circuit 812 through the error control circuit 847 to the antenna 86 after being modulated by the QPSK modulation/demodulation circuit 806 in the downstream direction, that is, when the signal is sent from the video display device 200 to the video device 100 . Output from The video equipment 100 receives this signal through the antenna 83, passes it through the QPSK modulation/demodulation circuit 83, QPSK-demodulates it with the QPSK modulation/demodulation circuit 803, and after error detection/correction with the error control circuit 843, bit selection circuit 811. transmit to Conversely, when the inter-device control signal is sent in the upstream direction, that is, from the video device 100 to the video display device 200, the bit selection circuit 811 passes through the error control circuit 843 and is modulated by the QPSK modulation/demodulation circuit 803. Output from antenna 83 . Video display device 200 receives this signal at antenna 86 , QPSK demodulates it with QPSK modulation/demodulation circuit 806 , performs error detection and correction with error control circuit 847 , and then transmits it to bit selection circuit 812 . By doing so, there is an effect of reducing malfunctions even in a noisy environment with respect to inter-equipment control signals that are 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 two bits of the digital signal. In other words, taking advantage of the fact that the upper bits of a video signal have a greater effect on image quality, 2 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 to improve the image quality. It is intended to reduce the deterioration of By the way, in a system in which audio information is more important than video, it is possible to allocate important (for example, upper) two bits of an audio signal to a transmission path using QPSK modulation.

Furthermore, when a human recognizes an image, there is a tendency that high-frequency components are relatively unnoticeable compared to low-frequency components, with respect to frequency components in the horizontal direction of the screen and frequency components in the vertical direction of the screen. In addition, there is a tendency that the human eye cannot keep up with fast movements among moving objects on the screen. Using these tendencies, the horizontal direction of the screen may be divided into low-frequency components and high-frequency components, QPSK modulation may be used for the low-frequency components, and 64QAM modulation may be used for the high-frequency components. By doing so, it is possible to improve the noise tolerance for important information and secure the overall transmission capacity in a limited transmission band. Similarly, the vertical direction of the screen may also be divided into low frequency components and high frequency components, QPSK modulation may be used for the low frequency components, and 64QAM modulation may be used for the high frequency components. By doing so, it is possible to improve the noise tolerance for important information and secure the overall transmission capacity in a limited transmission band. Furthermore, it is possible to combine handling of frequency components in the horizontal direction of the screen and handling of frequency components in the vertical direction of the screen to improve noise tolerance for desired important information.

In the above description, the error control circuits 841, 842, 843 add error control information to the bits input to the error control circuits 841, 842, 843, respectively. , 843 may be collectively treated as one word, and error control information may be added to this one word. With this configuration, the error control circuit becomes simple and easy to configure.

With the configuration shown in FIG. 8, for example, a plurality of still images captured by the video equipment 1 are switched at a predetermined cycle, for example, every second, and transmitted to the video display device 200 or the video equipment 2. A plurality of still images can be displayed on the video display device 200 or the video equipment 2 . The video display device 200 or the video device 2 sends a video request signal for sending an image to the video device 1, and based on this video request signal, the video device 1 switches a plurality of still images to display the still image. is transmitted to the video display device 200 or the video equipment 2 . With this configuration, when an image cannot be reproduced on the video display device 200 or the video equipment 2, by sending the video request signal again to the video equipment 1, it is possible to repeat until the image is correctly received. . Also in this case, since the video request signal uses QPSK modulation, the noise resistance performance is excellent.

An embodiment for acquiring an image from the video equipment 1 using such a video request signal and displaying it on the display device will be described with reference to FIG. In this embodiment, a case in which a plurality of still images captured by the video equipment 1 are switched and displayed on the video display device 200 will be described as an example, but the display on the video equipment 2 can be performed in the same manner. is.

FIG. 10 shows an embodiment of a display device configured to display a still image from the video equipment 1. In this embodiment, a television display having a high-definition HD display 1002 as the display device is shown. using the device. In FIG. 10, video equipment 1020 is specifically a digital camera, mobile phone, game machine, personal media player, or the like. In this embodiment, the video equipment 1020 transmits a still image to the video display device 200 (television display device) via two interfaces. One is HDMI for transmitting still images as baseband video information, and the other is USB for transmitting still images as compressed video information. Here, it is assumed that the compressed video information transmitted by USB is compressed in JPEG format.

First, the configuration and operation of the video equipment 1020 will be described. When transmitting a still image of compressed video information, the video equipment 1020 reads out a still image compressed in JPEG format from the memory 1018 configured by, for example, a flash memory. This is supplied from the USB mass storage interface circuit 1019 to the USB terminal 1012 which is the first input section of the video display device 200 without undergoing signal processing such as decompression processing.

On the other hand, when transmitting a still image of baseband video information, the video equipment 1020 first reads the still image from the memory 1018 . Since this still image is compressed in JPEG format, the signal processing circuit 1016 performs signal processing for decompressing the compressed image to generate baseband video information. This baseband video information is transmitted from the HDMI interface circuit 1017 to the HDMI terminal 1005 which is the second input section of the video display device 200 .

Next, the configuration and operation of the image display device 200 will be described. A still image of compressed video information input to the USB terminal 1012 which is the first input unit is supplied to the image processing circuit 1006 via the USB host interface circuit 1011 . The image processing circuit 1006 includes a JPEG data file access circuit 1010 , a JPEG decoding circuit 1009 , a resizing/effect adding circuit 1008 , and an image stream signalizing circuit 1007 . A still image input to the USB terminal 1012 is supplied to the JPEG decoding circuit 1009 via the JPEG data file access circuit 1010, and the still image compressed in the JPEG format is decoded in this circuit, that is, decompression processing is performed. . A resizing/effect adding circuit 1008 changes the display size (the number of pixels in the horizontal and vertical directions) of the still image that has undergone the decompression processing, and performs desired effect processing (for example, rotation processing, etc.) on the still image. be. The still image that has undergone processing such as resizing in the resizing/effect adding circuit 1008 is converted into an image signal for display by the image stream signalizing circuit 1007 and supplied to the HD display 1002 via the switching circuit 1003 . As a result, the compressed still image input via the USB host interface circuit 1011 is displayed on the screen of the HD display 1002 .

In this embodiment, a LAN terminal 1014 that can be connected to various networks 1015 such as a wireless LAN, a wired LAN, and the Internet is provided as a first input unit to which compressed video information is input. Therefore, in this embodiment, it is possible to acquire compressed video through the network 1015 as well as through the USB interface. Compressed video information input to the LAN terminal 1014 is input to the image processing circuit 1006 via a LAN/DLNA (Digital Living Network Alliance) interface circuit. The processing in this image processing circuit 1006 is the same as the above-described processing for the compressed video information input via the USB terminal 1012, so redundant description will be omitted here.

On the other hand, the still image of the baseband video information input to the HDMI terminal 1005 which is the second input section is subjected to predetermined decoding processing (decryption processing) by the HDMI interface/decoding circuit 1004 . The still image that has undergone the descrambling process is supplied to the HD display 1002 via the switching circuit 1003, and the still image is displayed on the screen of the HD display 1002. FIG.

The switching circuit 1003 selects either a still image input to the HDMI terminal 1005 or a still image input to the USB terminal or LAN terminal 1014 and supplies it to the HD display 1002. For example, video It is controlled by the user's manipulation of the remote controller for the display device 200 . Therefore, the user can select either the compressed video information or the baseband video information according to his/her preference and display it on the HD display 1002 .

In the above embodiment, HDMI and USB interfaces are used as interfaces for connecting with the video equipment 1020, but of course, interfaces of other standards may be used.

Here, before explaining the operation of the present embodiment based on the video request signal, the HDMI interface will be supplementarily explained. FIG. 16 shows a configuration example of an HDMI interface, which mainly consists of a transmission side and a reception side. The transmission side includes a transmission section 1601 and a transmission side control section 1603 that controls the transmission section 1601. The transmission section 1601 encodes a video signal (Y, Pb, Pr) and an audio signal and outputs them to the reception section 1604. is configured as Furthermore, the transmission unit 1601 includes a TMDS encoding circuit 1602, which converts video signals (Y, Pb, Pr) and audio signals into serial video data and serial audio data, respectively. On the other hand, the receiving side includes a receiving section 1604 and a transmitting side control section 1606 that controls the receiving section 1604. The receiving section 1604 converts video data and audio data sent from the transmitting section 1601 into a TMDS decoder 1605 for TMDS decoding. Decodes and reproduces baseband video data and audio data. The CEC line 1607 constitutes a device control line that transmits control signals for the device, and display specification information called DDC is transmitted via the DDC line 1608 . Also, the receiving side transmits to the transmitting side an HPD (Hot Plug Detect) signal 1609 indicating that the transmitting side device and the receiving side device are connected.

FIG. 17 shows an example of the remote control code format transmitted by the CEC line 1607. In FIG. As shown in FIG. 17, the remote control code is 48 bits long, and includes a 16-bit manufacturer code for identifying the manufacturer and a 12-bit device code for identifying the device such as the model number and serial number of the device. . The format of the remote control code may be one other than that shown in FIG. Also, the length of the remote control code is not limited to 48 bits, and other bit lengths may be used. Next, an example of a method of transmitting this remote control code through the CEC line will be described with reference to FIG. First, when the video equipment and the display device are connected, the HPD signal 1609 indicating that the two devices are connected is sent from the display device to the video equipment. Then, the display device 200 next reads the manufacturer code and device code of the video device via the CEC line 1607 of the HDMI cable. Then, the read manufacturer code and device code are stored in the display device 200 together with the receiving interface number. The maker code and the device code may be stored in a memory, for example, in a microcomputer (not shown) of the display device 200 . If another HDMI cable is connected, similar processing is performed on that HDMI cable, and the corresponding manufacturer code and device code are recorded on the display device together with the receiving interface number. The maker code and equipment code thus read are stored as a table shown in FIG. With this configuration, even if the display device 200 and the video device 1020 that are connected to each other are made by different manufacturers, communication between the two can be performed by referring to the stored manufacturer code and device code. The display device 200 can be controlled from the video device 1020 side, and display specification information (DDC) can be transmitted from the display device 200 to the video device 1020 .

Returning to FIG. 10 again, the operation of this embodiment based on the video request signal will be described. In FIG. 10, the user operates an input device such as a remote controller or a keyboard of the image display device 200, and receives a control command from the input device so that the display mode for switching and displaying the still image as described above is entered. output. According to this control command, the JPEG data file access circuit 1010 of the video display device 200 outputs a still image, which is compressed video information, to the external video device 1020 via the USB host interface circuit 1011 and USB terminal 1012. A video request signal is sent as follows. That is, in this example, the JPEG data file access circuit 1010 functions as a transmission unit for transmitting the video request signal to the external video equipment 1020 . Such a video request signal is transmitted from the video display device 200 to the video equipment 1020 at predetermined intervals (for example, every second). Upon receiving this video request signal, video equipment 1020 outputs the still image data recorded in memory 1018 via USB mass storage interface circuit 1019 . The USB host interface circuit 1011 takes in this still image data via the USB terminal 1012 . After that, the JPEG decoding circuit 1009 JPEG-decodes the read JPEG data to restore the original image data. Then, a resize/effect addition circuit 1008 performs resizing and effect processing, and an image stream signalization circuit 1007 converts the signal into an image signal for display, which is displayed on the HD display 1002 .

By repeating the processing from transmission of the video request signal to conversion processing of the image signal for display by the image stream signalization circuit 1007 described above at predetermined intervals (for example, 1 second), a slide show is obtained from the video equipment 1020. It is possible to perform an image display method of switching and displaying a plurality of still images at predetermined intervals. Of course, this time interval can be set to another time instead of one second, and this interval can be appropriately changed by the user using the above-described input device. Further, the video request signal may be repeatedly output until all still images are read out from the video equipment 1020. The image request signal may be transmitted periodically.

It is also possible to send the aforementioned video request signal from the microcomputer (not shown) of the video display device 200 to the video device 1020 via the HDMI interface/decode circuit 1004 and HDMI terminal 1005 . In this case, since the HDMI interface is an interface for transmitting moving images as a transmission format, moving images that do not change with time are sent unless there is a specific control.

First, the user operates an input device such as a remote controller or a keyboard of the image display device 200 to output a control command from the input device so as to enter the display mode. In accordance with this control command, HDMI interface/decode circuit 1004 transmits a video request signal to video equipment 1020 via the CEC line in HDMI terminal 1005 . That is, in this example, the HDMI interface/decode circuit 1004 functions as a transmission section for transmitting the video request signal to the external video equipment 1020 . This video request signal is transmitted from the video display device 200 to the video device 1020 at predetermined periodic intervals (for example, every second) for several seconds to one minute, for example, in the same manner as in the above example. In response to this, the video equipment 1020 converts the still image data recorded in the memory 1018 into a signal format that can be displayed as a moving image by the signal processing circuit 1016 and outputs it via the HDMI interface circuit 1017 . The video display device 200 receives this data via the HDMI terminal 1005 and the HDMI interface circuit/decode circuit 1004, and displays it on the HD display. By repeating this process at predetermined time intervals, an image display called a slide show is possible. Naturally, this time interval may be configured to be appropriately changeable by the user in the same manner as described above. The video request signal may be repeatedly output until all still images are read out from the video equipment 1020, or the video request signal may be transmitted at predetermined intervals within a predetermined period as described above. may

Also, the explanation so far has been about the method of displaying the image information from the video equipment 1020 on the video display device 200, but the same method can be used to display the slide show even when the image information exists on the network 1015. It is possible. In this case, the JPEG data file access circuit 1010 of the video display device 200 receives a control command from the input device and transmits it to the network 1015 via the LAN/DLNA interface circuit 1013 and LAN terminal 1014 . In this case, the network address (for example, IP address) of the video equipment connected to the network is added to the video request signal. A video signal corresponding to the address added to the video request signal transmits still image data as compressed video information in response to the video request signal. This still image data is input via the LAN terminal 1014 and the LAN/DLNA interface circuit 1013 and supplied to the JPEG decoding circuit 1009 . The subsequent processing is the same as the processing for the still image input to the USB terminal 1012 described above, so redundant description will be omitted here.

In this embodiment, the LAN terminal 1014 and the LAN/DLNA interface circuit 1013 are provided to realize this network function, but it is also possible to extend the HDMI interface or USB interface to have the same function. .

FIG. 11 shows the configuration of another embodiment according to the present invention. In FIG. 11, the same components as in FIG. 10 are assigned the same numbers as in FIG. The difference between the configuration of FIG. 11 and FIG. 10 is that the signal path from USB terminal 1012 and the signal path from LAN terminal 1014 are eliminated from display device 200 in FIG. In the configuration of the video equipment 1020, instead of the USB mass storage interface circuit 1019, a PTP (protocol for connecting a digital camera and a PC or the like via USB and transferring and controlling images) control circuit 1101 and a LAN interface. Another difference is that a circuit 1102 is newly provided. 10 and 11, the path of the HDMI terminal works in the same way, and a slide show can be performed. The use of the configuration of FIG. 11 simplifies the configuration of the display device 200 and eliminates the need for complicated connections, thereby increasing user convenience. That is, the present embodiment can also be applied to a configuration in which only the first input section is provided, that is, a configuration in which a still image of baseband video information is displayed. Also, in this example, one HDMI interface system is used, but two or more systems may be provided.

Here, another display form of a plurality of still images captured by the video equipment 1 on the video display device 200 will be described with reference to FIG. 10 . In such a display form, a plurality of still images are reduced and displayed simultaneously on one screen of the HD display 1002 .

In FIG. 10, the JPEG data file access circuit 1010 of the video display device 200 sends a still image video acquisition request to the video equipment 1020 via the USB host interface circuit 1011 and the USB terminal 1012 . In response to this, the video equipment 1020 outputs the still image data, which is compressed video information recorded in the memory 1018 , via the USB mass storage interface circuit 1019 . The USB host interface circuit 1011 reads this still image data via the USB terminal 1012 . After that, the JPEG decoding circuit 1009 JPEG-decodes the read JPEG data to restore the original image data. Then, it is resized and effect-processed by a resizing/effect adding circuit 1008, and is temporarily stored as an image of a portion corresponding to the display position 1 in FIG. Similarly, the JPEG data file access circuit 1010 sends a video acquisition request for the next still image to the video device 1020 via the USB host interface circuit 1011 and USB terminal 1012 . In response to this, the video equipment 1020 outputs the still image data, which is the next compressed video information recorded in the memory 1018 , via the USB mass storage interface circuit 1019 . The USB host interface circuit 1011 reads this still image data via the USB terminal 1012 . After that, the JPEG decoding circuit 1009 JPEG-decodes the read JPEG data to restore the original image data. Then, it is resized and effect-processed by a resizing/effect adding circuit 1008, and is temporarily stored as an image of a portion corresponding to the display position 2 in FIG. By repeating the processing from the video acquisition request to the temporary storage of the image 12 times, for example, it is possible to collectively display a plurality of still images called thumbnail display, as shown in FIG. This processing is performed, for example, by transmitting video acquisition requests to the video equipment 1020 12 times within a predetermined period of time (for example, less than 1 second).

When the video equipment 1020 has 12 or more still images, thumbnail display is performed for every 12 still images. Such a display method allows a plurality of images to be viewed at the same time, and thus has the effect of making it easy to distinguish between different colors and subtle differences in scenes, which is convenient.

In this example, one video device 1020 is connected in order to explain the operation in an easy-to-understand manner, but two video devices 1020 can be connected. It is also possible to view them side by side. In this way, it is possible to check the difference in color and brightness due to the variation between the two video devices 1020 and the difference in shooting conditions, so that the desired image can be easily selected from the images of the two video devices. It has the effect of being able to

This display function can also be realized using the configuration of FIG. 10 and 11 have the same effect in terms of operation, and a plurality of still images captured by the video equipment 1 can be collectively displayed. The use of the configuration of FIG. 11 simplifies the configuration of the display device 200 and eliminates the need for complicated connections, thereby increasing user convenience. In this case, a memory for synthesizing a plurality of small images is required. Alternatively, a plurality of small screens may be synthesized in advance in the memory 1018 of the video equipment 1020 and then sent to the video display device 200. , the HDMI interface circuit and the decoding circuit 1004 may be followed by a memory (not shown), and this memory may constitute a small screen. Either configuration has the same effect as in FIG.

In the above description, the number of still images to be displayed at the same time is 12. However, as shown in FIG. 13, it is also possible to display two rows by two columns. In addition, as shown in FIG. 14, it is also possible to display two vertical rows and two horizontal columns. 13 and 14, since the resolution of the HD display 1002 is 1080×1920, the resolution of one small screen is about 300×500. Become. Further, when the small screen itself becomes smaller, screen flicker or the like occurs, but this flicker can be reduced by using the division shown in FIGS. On the other hand, when the division of FIG. 12 is used, when an image is input from a digital camera, the aspect ratio of the image is approximately 4:3. It has the effect of being able to Also, even if they are displayed side by side as shown in FIGS. 13 and 14, almost the same effect can be obtained, although some regions are not displayed.

By the way, each image stored in the memory 1018 of the video equipment 1020 is added with attribute information such as image rotation information and erroneous erasure prevention lock information for preventing erroneous erasure. In this embodiment, these attribute information are sent from the video display device 200 via the HDMI terminal 1005 to the video equipment 1020 and stored in the memory 1018 by operating the remote control or keyboard of the video display device 200. I'm trying FIG. 15 shows an example of an attribute information management table recorded on the memory 1018. As shown in FIG. As shown in FIG. 15, each of the plurality of still images stored in the memory 1018 of the video equipment 1020 is added with attribute information regarding whether erasure lock is possible and the rotation angle according to the signal from the video display device 200. can be made With this configuration, the device directly controlled by the user is always the video display device 200. Therefore, even if an arbitrary video device 1020 is connected, the same operation can be used to perform lock control to prevent accidental erasure and display of video. Control such as rotation can be performed, and there is no need to learn complicated operations for each video device 1020, thereby improving convenience.

Although details of encryption processing are not described in the embodiment shown in FIG. 8, the encryption circuit 171 and the interface circuit 172 can be combined to perform processing as shown in FIG. FIG. 9 shows an example of a configuration for performing cryptographic processing in the system shown in FIG. 8. The system in FIG. , and error control circuits 841, 842, 843, 845, 846, and 847.

In the example shown in FIG. 9, like the example in FIG. , 822 and input to the QPSK modulation/demodulation circuit 801 and the 64QAM modulation/demodulation circuit 802 . The signals demodulated by the QPSK modulation/demodulation circuits 804 and 64QAM modulation/demodulation circuits 804 and 805 are input to encryption/decryption circuits 824 and 825, respectively encrypted and decrypted, and then bit-combined by a bit selection circuit 812. FIG. By processing in this way, signal processing according to the degree of importance becomes possible, and important information is less likely to be erroneous, and therefore image quality deterioration can be reduced and transmission can be performed efficiently.

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

Further, a supplementary explanation of encryption will be given. If AES 128-bit encryption processing is used for all encryption circuits, it is possible to perform protection processing with a high degree of security. In addition, AES 128-bit encryption processing is used for the content encryption circuit 821, and DES encryption processing is used for the other encryption circuits. It becomes easier to configure the system.

Furthermore, it may be configured to switch between baseband signal transmission and compressed signal transmission in accordance with an 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 resistance in the transmission line. Also, when transmitting a baseband signal, 64QAM modulation enables transmission with good transmission efficiency.

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 device 100 to perform transmission, first, a carrier wave detection circuit (not shown) checks whether or not the used channel is already occupied by another device. 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 detection circuit detects that the channel is being used by another device, wait for a while and check the vacant state of the channel again. After that, when it detects that the channel is not used by other equipment, it notifies the microprocessor 115 of the video equipment 100 that the channel is available. The microprocessor 115 outputs a channel use request signal from the QPSK modulation/demodulation circuit 803 as an inter-device control signal to secure the right to use the channel. Microprocessor 115 then outputs a transmission request signal to 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 . A QPSK modulation/demodulation circuit 803 performs QPSK modulation and transmits a wireless signal to the video display device 200 via the antenna 83 . On the other hand, the video display device 200 QPSK-demodulates the radio signal received by the antenna 86 by the QPSK modulation/demodulation circuit 806 , and encrypts/decrypts it by the encryption/decryption circuit 826 . An error control circuit 847 performs error detection/correction control on the decoded signal to output an inter-device control signal, which is transmitted to the bit selection circuit 812 . The microprocessor in the image display device 200 decodes the received inter-device control signal, and together with the transmission request signal from the image device 100, device category information (category such as whether it is a display device or a recording device) regarding the image device 100. ) and the device identification number of the video device 100 . The display screen of the video display device 200 displays whether or not to connect to the video device 100. Based on this display, the user can use the input device such as the remote control of the video display device 200. command to allow the connection. After that, the video device 100 and the video display device 200 exchange mutual device category information, identification numbers for identifying mutual devices, and the like, and comply with content copyright protection and copy restriction conditions. exchange of information for each other, and if there is no problem, mutual connection is permitted. Here, if the two devices are input-only devices or output-only devices, or if there is no point in connecting, or if content copyright protection or copy restriction conditions are violated, etc., connection processing should be performed. It will be stopped, and a message to that effect will be displayed on each device. In this way, when there is no problem with the copyright protection of the content and the copy restriction conditions, the connection is made, and the video, audio, etc. are transmitted from the video equipment 100 to the video display device 200 .

FIG. 5 shows a second embodiment of the present invention, showing another configuration of the image display device 200 shown in FIG. FIG. 5 is partially common to the embodiment shown in FIG. 4, and the common parts are given the same reference numerals and detailed descriptions thereof are omitted. The video display device 200 shown in FIG. 5 includes an encryption/decryption circuit 212, encryption/encryption/decryption circuits 245 and 290, compression/transcoding circuits 291 and 292, and a copy control circuit 293 which is a multiplex circuit.

In the embodiment shown in FIG. 5, when a baseband signal is input from terminal 201 or terminal 202, it operates in the same manner as the embodiment shown in FIG. The compression/transcoding circuits 292, 291 operate as compression circuits for baseband signals. When a compressed signal is input from the terminal 201 or terminal 202, the cipher required for transmission is decrypted by the encryption/decryption circuit 212 through the input/output interface 210, and the compressed video signal and the separated into compressed audio signals. Each signal is input to the duplication control circuit 290, and whether duplication is permitted or not is determined from information indicating whether or not duplication is permitted. If duplication is possible, the compression/transcoding circuits 291 and 292 reduce the bit rate of the compressed video signal and compressed audio signal by using a compression method with higher compression efficiency as necessary. be. The output signals of compression/transcoding circuits 291 and 292 are multiplexed by multiplexing circuit 293 and input to encryption/decryption circuit 245 . Here, if the duplication control circuit 290 detects that duplication is permitted, the encryption/encryption decryption circuit 245 appropriately encrypts the input signal for storage and stores it. Store in device 230 and/or memory 221 . When reproducing the stored signal, the reproduced signal from the storage device 230 and the memory 221 is decrypted by the encryption/encryption decoding circuit 245, and separated into a video signal and an audio signal by the demultiplexing circuit 241. After that, it can be processed and viewed in the same manner as described above. When viewing while accumulating in the storage device 230 or memory 221, the signal from the multiplexing circuit 293 is input to the demultiplexing circuit 241 via the encryption/encryption decoding circuit 245 and processed in the same manner. In this case, the transcoded image quality can be checked. When viewing directly without storing, the signal is input from the encryption/decryption circuit 212 to the demultiplexing circuit 241 via the encryption/encryption/decryption circuit 245, where it is separated into a video signal and an audio signal, and so on. processed to

In the embodiment shown in FIG. 5, even when a compressed signal is input, transcoding enables efficient storage at a higher compression ratio. Further, in the present embodiment, an example of implementing signal processing means, including the compression circuits 111 and 113, by means of circuits has been shown. However, the above-described processing may be performed by configuring various circuit elements with software means, and the same effect can be obtained even in that case. The invention does not limit how the signal processing is implemented.

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 multiplex circuit 124, 150, 151, 224 , 251, 252 signal processing circuit 130, 230 storage device 140, 240, 245 encryption/encryption decoding circuit 141, 250, 241 demultiplexing circuit 142, 143, 242, 243 decompression circuit 160 display device 161, 270 audio output device 171 encryption Circuit 180 Broadcast receiver 200 Video display device 211, 212 Encryption/decryption circuit 260 Display 280 Duplication control circuit 300 Receiver

Claims (8)

In a television display device,
a first interface unit capable of wirelessly inputting compressed image information from an external device;
a decompression unit capable of decompressing the compressed image information input to the first interface unit;
a second interface unit capable of inputting uncompressed image information by wire from an external device;
A first image based on the image information obtained by decompressing the compressed image information input to the first interface unit by the decompression unit, or a second image based on the uncompressed image information input to the second interface unit and a display unit capable of displaying an image of
The display unit is further configured to be able to display a received television broadcast program,
It is possible to select whether to display the first image on the display unit or display the second image on the display unit according to an operation on the input device of the television display device,
When displaying the first image is selected, based on an operation for displaying a slide show on the input device of the television display device,
The first interface unit wirelessly transmits a first signal for outputting compressed image information from the external device to the external device, and wirelessly inputs the compressed image information output from the external device the display unit displays a slide show at predetermined time intervals using a plurality of first images based on image information obtained by decompressing the input compressed image information by the decompression unit;
When displaying the second image is selected, based on an operation for displaying a slide show on the input device of the television display device,
The second interface unit transmits a second signal to the external device via a wire so that the external device converts the compressed image information into uncompressed image information and outputs the uncompressed image information output from the external device. By inputting image information by wire, the display unit displays a slide show at predetermined time intervals using a plurality of second images based on the input uncompressed image information.
A television display device characterized by: 2. The television display device according to claim 1, wherein the predetermined time interval of the slide show display using the first image or the predetermined time interval of the slide show display using the second image is A television display device that can be changed by operating an input device. 3. The television display device according to claim 1, wherein an image based on said compressed image information input to said first interface unit can be displayed on said display unit by rotating it based on an operation on said input device. A television display device characterized by: In a television display device,
a wireless LAN interface unit capable of inputting compressed image information from an external device via a network;
an HDMI interface unit capable of inputting uncompressed image information from an external device;
a decompression unit capable of decompressing the compressed image information input to the wireless LAN interface;
A first image based on the image information obtained by decompressing the compressed image information input to the wireless LAN interface by the decompression unit, or a second image based on the uncompressed image information input to the HDMI interface. a displayable display,
The display unit is further configured to be able to display a received television broadcast program,
It is possible to select whether to display the first image on the display unit or display the second image on the display unit according to an operation on the input device of the television display device,
When displaying the first image is selected, based on an operation for displaying a slide show on the input device of the television display device,
The wireless LAN interface unit transmits a first signal for outputting compressed image information from the external device to the external device via the network, and transmits the compressed image information output from the external device via the network. the display unit performs a slide show display at predetermined time intervals using a plurality of first images based on image information obtained by decompressing the input compressed image information by the decompression unit,
When displaying the second image is selected, based on an operation for displaying a slide show on the input device of the television display device,
The HDMI interface unit transmits to the external device a second signal for causing the external device to convert the compressed image information into uncompressed image information and outputs the uncompressed image information, and inputs the uncompressed image information output from the external device. By doing so, the display unit displays a slide show at predetermined time intervals using a plurality of second images based on the input uncompressed image information.
A television display device characterized by: 5. The television display device according to claim 4, wherein the predetermined time interval of the slide show display using the first image or the predetermined time interval of the slide show display using the second image is A television display device that can be changed by operating an input device. 6. The television display device according to claim 4, wherein an image based on compressed image information input to said wireless LAN interface can be displayed on said display by being rotated based on an operation on said input device. A television display device, comprising: 5. A television display device according to claim 4, wherein said network is a DLNA network. 5. A television display device according to claim 4, wherein said network is a wireless network.

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