JP6534720B2 - Display device - Google Patents

Description

The invention relates to a method of transmitting a digital video signal, for example for receiving a digital broadcast signal
The present invention relates to a video processing apparatus such as a set top box (STB) and a television display apparatus.

With the spread of HD (High Definition) broadcasting by terrestrial digital broadcasting and the release of the Blu-ray (registered trademark) recorder capable of recording HD broadcasting, high-quality HD video without degradation in image quality T
There is a growing need for digital video interfaces that can be transmitted to V. As an interface for uncompressed video signal transmission, DVI (Digital Visual I) developed by DDWG
), HDMI, High Definition Multimedia licensed by HDMI, LLC
Interface, registered trademark). Also, as an interface for video signal transmission compressed by MPEG or the like, there are IEEE 1394, LAN and the like. As a prior art which applies the interface of non-compression video signal transmission to a television apparatus, it describes, for example in the nonpatent literature 1. FIG. This discloses packetizing and multiplexing transmission of video format information into non-packetized uncompressed video signals. In HDMI, audio data is also packetized and transmitted. As a prior art which applies the interface of compressed video signal transmission to a television apparatus, it describes, for example in the nonpatent literature 2. FIG. Also, as an example of the copyright protection technology used for these, HDCP (High-bandwidth Digital Conte) for uncompressed video
nt Protection System) but DTCP (Digital Transmission Conte) for compressed video
nt protection).

An SDDI (Serial Digital Data Interface) system in which an uncompressed video signal and a compressed video signal are respectively packetized and simultaneously serially transmitted is described in, for example, Patent Document 1.

JP-A-8-307455

Standard "CEA-861-B" US CEA 2002 Standard "CEA-775-B" US CEA 2004

In the future, it is expected that the types of signal sources will increase, and there will be an increase in cases where a TV is required to have an input interface for uncompressed video signals and compressed video signals. However, when two types of interfaces with different connectors are provided in a television device (television receiver or the like), it is necessary to secure a connector space and prepare two types of cables. Patent document 1 is
A system for simultaneously transmitting an uncompressed video signal and a compressed video signal is disclosed, which is a transmission system suitable for a broadcast station. That is, since the non-compressed video signal is packetized in the transmission method described in Patent Document 1, it is difficult to apply this to television equipment for general home use.

Also, depending on the type of interface to be handled, the type of copyright protection technology used will also increase. Even in such a case, it is necessary to appropriately cope with the copyright protection technology.

The present invention has been made in view of the above problems, and an object thereof is to provide a technology relating to an interface capable of transmitting both uncompressed video signals and compressed video signals. Another object of the present invention is to provide a technology capable of suitably protecting copyright.

In order to achieve the above object, one aspect of the present invention is a display device, a receiver capable of receiving a digital video signal and a clock signal from an external video signal source, and a digital video received by the receiver. A display unit for displaying an image using a signal and a clock signal, and the receiving unit is configured to receive a digital video signal from an external video signal source and a clock signal as a mode for receiving the first reception mode and the first reception mode; And the receiving unit is configured to receive the uncompressed first digital video signal from the external video signal source and the first digital video signal in the first receiving mode. The first clock signal which is intentionally or physically separated, the receiving unit being in the second reception mode, the second digital video signal not being compressed from the external video signal source; Digital projection of 2 Receiving a second clock signal which is superimposed on the signal, said receiver unit has a function of transmitting information to the external video signal source, the display device is capable of reception by the second reception mode Transmitting information indicating an external video signal to an external video signal source .

Further, according to one aspect of the present invention, in the display device, the receiving unit is used in common in the first reception mode and the second reception mode.

According to the present invention, it is possible to provide an interface common to uncompressed video signals and compressed video signals. In addition, suitable copyright protection is possible.

Block diagram showing a first embodiment of a video processing apparatus according to the present invention Block diagram showing an exemplary configuration of a transmitter and a receiver of a video processing apparatus A diagram showing an example of a compressed video packet structure Block diagram showing a second embodiment of the video processing apparatus according to the present invention Block diagram showing a third embodiment of the video processing apparatus according to the present invention Block diagram showing the flow of the video signal of the video processing apparatus in the third embodiment The figure which shows the example of 1 structure of the output circuit in 3rd Example, and an input circuit. A diagram showing a basic configuration example of an output circuit and an input circuit of a video processing apparatus Block diagram showing a fourth embodiment of the video processing apparatus according to the present invention The figure which shows the example of 1 structure of the output circuit in 4th Example, and an input circuit.

Hereinafter, the best working liquid of the present invention will be described below with reference to the drawings. The present invention is to simultaneously transmit an uncompressed video signal and a compressed video signal through a common (identical) interface. Then, such transmission is realized while maintaining the interoperability with non-compressed digital interfaces such as DVI and HDMI which are becoming widespread. In the embodiment to be described, the video processing apparatus includes, for example, an STB incorporating a digital tuner, a television display apparatus (hereinafter referred to as "TV") and the like. Of course, the following embodiments can be applied to other than these devices.

FIG. 1 is a block diagram of a first embodiment according to the present invention, which is an example of an image processing apparatus ST.
A B (Set Top Box) 11, a TV 12 which is another example of a video processing apparatus, and a mobile viewer 13 capable of viewing video on the go. Hereinafter, those operation examples will be described.

The STB 11 receives an RF signal 101 supplied from a digital broadcast, a cable or the like, and demodulates a transport stream (hereinafter abbreviated as TS) of compressed video by a digital tuner 111. The demodulated TS is converted into a program stream (hereinafter referred to as PS) by the TS / PS converter 112.
, And the decoding unit 113 obtains an uncompressed video signal. This uncompressed video signal and OSD
The video combining unit 114 combines the OSD screen generated by the unit 115. This non-compressed video signal is not packetized and transmitted from the transmission unit 117 via the video signal interface 103 to T.
It is transmitted to the receiving unit 127 of V11. The non-compressed video signal received by the receiving unit 127 is sent to the display unit 129 via the video combining unit 124. The display unit 129 displays a video screen in real time based on the non-compressed video signal and provides it to the user. The control units 116 and 126 not only control multiplexing and communication status of the transmission unit 117 and the reception unit 127, respectively, but also control the TV
The display performance of 12 (characteristics and specifications relating to display of video) is transmitted to the STB 11, and an operation of matching the video signal transmitted from the STB 11 with the display characteristic of the TV 12 is performed. Further, bidirectional communication control can also be performed so that remote control control codes and the like can be mutually exchanged to enable cooperative operation between the STB 11 and the TV 12.

On the other hand, the TS output of the digital tuner 111 and the OSD output of the OSD unit 115 are the transmitter unit 11.
Also sent to 7 The transmitting unit 117 multiplexes TS and OSD packet data into a non-compressed video signal to generate a multiplexed video signal, and transmits the multiplexed video signal to the receiving unit 127 via the interface 103. The receiving unit 127 generates an uncompressed video signal, a TS and an OS from the received multiplexed video signal.
Separate from D The TS and the OSD separated or extracted by the receiving unit 127 are stored in the storage unit 12.
Accumulated in 8 The storage unit 128 is configured of, for example, a hard disk. You may comprise by semiconductor memory, such as flash memory. Thereby, video recording based on the TS is performed. The recorded TS is read from the storage unit 128 according to the user's instruction, and the TS / PS
The converter 122 extracts PS, and the decoder 123 obtains an uncompressed video signal. At the same time, the OSD data is also read from the storage unit 128 as needed, and the OSD unit 125 forms a non-compressed OSD video signal. The OSD video signal is video-combined with the non-compressed video signal output from the decoding unit 123 in the video combining unit 124. The non-compressed video signal obtained by combining the recorded video and the OSD is displayed by the display unit 129, and is viewed in a time zone desired by the user (time shift viewing).
can do.

If the TV 12 has the digital tuner 121, it can receive digital broadcasting and the like as in the STB 11, record the TS by the storage unit 128, and can view the time shift. Furthermore, the uncompressed video signal obtained through the TS / PS converter 122 and the decoder 123, ST
It is also possible to combine the non-compressed video signal sent from B11 in the video combining unit 124 and simultaneously display two screens on the display unit 129. The digital tuners 111 and 121 may receive different channels and combine two screens. Also, the video of the channel received by the terrestrial digital tuner and the video of the channel received by the cable television tuner may be combined in two screens. S
If the TB 11 is equipped with a digital tuner 111 (that is, a digital tuner capable of receiving a channel which can not be received by the digital tuner of the TV 12) different from the digital tuner built in the TV 12 with a digital tuner There is also an effect that time shift viewing can be realized. In addition, even after the STB 11 is removed from the TV 12, there is an effect that it is possible to watch the video received by the STB and remaining in the storage unit 128.

It is obvious that the compressed video signal and the non-compressed video signal multiplexed by the transmission unit 117 may be different programs as long as the digital tuner 111 can simultaneously receive a plurality of channels. Also, the compressed video data multiplexed by the transmission unit 117 is not TS, but TS /
It may be PS after PS conversion. PS has the advantage of reducing the amount of data transmission compared to TS.

The compressed video signal recorded in the storage unit 128 is further subjected to code conversion such as high compression and transmission format by the code conversion unit 130, and then the interface unit 131 such as USB or IEEE 1394, the interface 104, and the interface unit 132. Through storage unit 1
It may be forwarded to 38. After transfer of the video signal, the mobile viewer 14 interfaces 10
It is separated from 4 and can be carried anywhere. Then, the mobile viewer 14 decodes the video stored in the storage unit 138 by the decoding unit 133 and displays the video by the display unit 139 according to the user's instruction. This allows the user to view a desired video at any place using the mobile viewer 14.

FIG. 2 is a block diagram showing an exemplary configuration of the transmission unit 117 and the reception unit 127. As shown in FIG. The operation example will be described below. Audio data 20 corresponding to uncompressed video from the video synthesis unit 114 (FIG. 1)
2, TS output 203 from digital tuner 111 (FIG. 1), and OSD unit 115 (FIG. 1)
Is input to the packet generation units 211, 212 and 213 of the transmission unit 117, respectively. The packet generation units 211 to 213 form packets suitable for multiplexing on a non-compressed video signal based on the input signals. The buffer unit 214 receives the packets from the packet generation units 211 to 213, rearranges them in accordance with the packet transmission priority, and sequentially transmits the packets in accordance with the blanking period of the non-compressed video signal. Buffer unit 2
The ECC code unit 215 inserts a code for error correction into the packet rearranged at 14. Then, interleaving processing in bit units is performed in interleaving section 216, resistance to burst errors is enhanced, and the result is sent to multiplex coding section 217. The multiplex coder 217 multiplexes the interleaved packet onto the uncompressed video signal output 201 from the video synthesis unit 114 (FIG. 1), and a copy control flag for the uncompressed video signal. And a transmission encoding unit 404 that performs encoding for transmission. The output of the multiplex coding unit 217 is transmitted to the input circuit 228 of the reception unit 127 as the multiplexed video signal 207 via the output circuit 218.

The multiplexed video signal received by the input circuit 228 is sent to the multiplex decoding unit 227. The multiplex decryption unit 227 includes a transmission decryption unit 411 that decrypts transmission encoding, a decryption unit 412 that decrypts encryption of a video signal, a copy flag extraction unit 413 that extracts a copy flag, and an uncompressed video signal 291. And another separation unit 414 for separating packet data. The packet data is interleaved by the de-interleaving circuit 226 to be restored to the original signal, and after being error-corrected by the ECC decoding unit 225, transmitted to the buffer unit 224. Buffer unit 2
24 temporarily holds the packet data and outputs it to the packet decoding units 221 to 223, respectively. The packet decoding units 221 to 223 decode the packet data from the buffer unit 224 to obtain audio data 292 of uncompressed video signal, TS 293, and OSD data 294. These are data sent from the receiving unit 127 to the storage unit 128 in FIG.

The capability transfer unit 229 transfers information on the display capability (display specification and / or display characteristics) of the TV to the capability identification unit 219 via the communication line 208. The capability identifying unit 219 identifies the display capability of the TV 12 based on the information on the display capability, and outputs an identification result 205. The identification result 205 is transmitted to the control unit 116 (FIG. 1). Then, the control unit 116 controls elements related to video processing or video output in the STB 11 so as to send out a video format suitable for the connected TV 12, and after confirming the display capability on the TV 12 side,
The multiplexed video signal according to the present embodiment is transmitted. With such a configuration, only the non-compressed video signal is transmitted without transmitting the multiplexed video signal to a device not provided with a configuration capable of inputting the multiplexed video signal (ie, a TV having a conventional interface). Therefore, the interoperability with the TV having the conventional interface is secured. It is preferable to use, for example, an EDID system defined by VESA as a configuration for transmitting such capabilities of the TV 12 side. In the present embodiment, the information on the display capability of the TV includes, for example, the horizontal and vertical resolutions of the display unit 129, the color reproduction range, and the gamma characteristics. Furthermore, to effectively use this embodiment,
In addition to the above, information relating to the display capability of the TV, for example, a video format indicating the display timing of the multiplexed video signal, a bit rate of compressed video, a list of decodable encoding methods, storage capacity of storage unit 128, free capacity You may want to add capabilities such as maximum recording speed and send.

The capability transfer unit 229 and the capability identification unit 219 are also used for device authentication and capability confirmation of cryptographic processing, in addition to the above. For example, in DVI and HDMI, Digital Content Prot is used as this encryption process.
There is an HDCP licensed by ection, LLC. In the future, with the diversification of content, it may be necessary to manage multiple cryptographic processes by content or country. In such a case, in the present embodiment, elements for multiple types of device authentication and encryption processing are provided on the receiving side of the video signal, and which process is appropriate with reference to the protocol for starting device authentication from the transmitting side An automatic discrimination / selection circuit may be provided to discriminate and select. On the other hand, the transmitting side determines the type of content, the country in which it is used, etc., and selects the encryption processing suitable for it and switches it automatically.
A selection circuit may be provided. For example, the region code recorded on the disc of the DVD may be read, and the encryption processing may be selected by the region code. In television broadcasting, the broadcasting station may be identified and encryption processing may be selected.

Depending on the regulations of the country and the enterprise, it may be necessary to fix encryption processing. In such a case, if a dedicated video processing device is newly prepared, the development cost may be high. Therefore, the video processing apparatus is provided with a plurality of encryption processing units capable of executing multiple types of encryption processing, and the type of encryption is determined;
A discrimination / selection circuit may be provided to select an encryption processing unit corresponding to the discrimination result. At this time, the determination and selection circuit may automatically determine the type of encryption and perform the selection operation. In addition, a setting circuit may be provided to enable the user to set the type of cryptographic processing. Also,
One of the plurality of cryptographic processes may be preset and fixed at the time of shipment by the setting circuit. In this case, a procedure (e.g., STB 11 or T) for changing the setting of encryption processing is performed so that the user can not change the setting of the type of encryption processing without permission by the setting circuit.
It is preferable to conceal the user from entering a command or password for V12). When changing the setting of the encryption process after shipment, it is possible to download the procedure related to the above setting change from, for example, broadcasting and / or the Internet under specific conditions (for example, charging of a fee from the user). May be In this way, the procedure is disclosed to the user under specific conditions in the above-mentioned concealed setting change, and the change in cryptographic processing by the user is effective. Such services may be provided in the implementation of this example. Furthermore, the procedure relating to the setting change may be stored in a storage medium such as a DVD and distributed as a setting changing DVD to the user.

Furthermore, when various cryptographic processes are used, the image quality can be changed by setting limits on the resolution, the bit rate of the compressed video signal, and the like depending on the grade of the cryptographic process.

The communication circuits 220 and 230 perform bi-directional communication via the communication path 209, and the control unit 1 of FIG.
Control information is transmitted and received between 16 and 126. For example, as the two-way communication in this embodiment, the configuration of two-way communication such as CEC defined by HDMI can be applied.
Also, if an error that can not be corrected by the ECC decoding unit 225 occurs, the TV 12 performs communication on this channel 2.
A retransmission request may be transmitted to the STB through 09, and the STB 11 may retransmit an error-generated compressed video signal in response to the retransmission request. This enables error free recording. The compressed video signal packet included in the compressed / non-compressed video signal multiplexed signal 207 is given an identification number or a symbol such as a time stamp, whereby the error packet number or the symbol is sent to the STB 11 together with the retransmission request. You may make it transmit. By this,
When a retransmission request occurs, the STB 11 can retransmit only the error packet by referring to the number or symbol of the error packet. Therefore, the STB 11 does not have to retransmit an error-free packet, so the transfer efficiency is improved.

The packet transmission processing in the buffer unit 214 described above, that is, the packet rearrangement processing according to the priority order will be described below. There is a limit to the transmission capacity of packets multiplexed and transmitted to the uncompressed video signal. The packet to be sent with the highest priority is the audio of the uncompressed video signal that needs to be reproduced in real time in synchronization with the video. Therefore, the priority of the audio packet of the non-compressed video signal is set to the highest, and the arrangement is determined with the highest priority. The compressed video packet and the OSD packet are arranged in the remaining area. The priority of the compressed video packet and the OSD packet is arbitrarily determined, but if the OSD is related to (or highly related to) the uncompressed video signal, the priority of the OSD packet is made higher than that of the compressed video packet. May be If the need for using compressed video in the TV 12 is high, the priority of the compressed video packet may be higher than that of the OSD packet.

In the case where compressed video is sent to the storage unit 128, it is necessary to arrange packets so as not to exceed the maximum recording speed of the storage unit 128. Alternatively, flow control may be performed by the communication path 209 to control the packet transmission amount. When the compressed video is reproduced on the TV 12 in substantially real time, it is necessary to control the amount of packets to be transmitted according to the coding speed of the compressed video.

Depending on the format of the non-compressed video signal, the packet transmission capability for multiplexing the compressed video signal may be insufficient. In this case, a format may be used in which the pixel clock of the non-compressed video signal is multiplied by n (n is 2 or more) or the blanking period of the non-compressed video signal is extended. In this way, the packet transmission capability of the compressed video signal can be improved.

FIG. 3 is a diagram showing an example of a packet structure of compressed video. As shown in FIG.
Packets have a 4-byte header and 184-byte adaptation (or payload)
It consists of a total of 188 bytes. On the other hand, in the gap of the non-compressed video signal (for
In order to multiplex S, smaller packet size is better. FIG. 3 shows the case where a packet is configured with a 3-byte header and a 28-byte payload. TS packet 188
The bytes may be divided into payloads of seven compressed video packets for transmission.

An example of the configuration of the header is described below. The first byte indicates the type of packet such as compressed video or audio. The total 16 bits of the second and third bytes may be allocated to the order (3 bits) of the TS packet divided into seven, the TS packet number (11 bits), and the copy control flag (2 bits). The TS itself also has a time stamp, and by using this, 11 bits of the TS packet number in the header may be omitted, but it is easier to use if it is described in the header portion. This TS packet number is used as an identification number for identifying a packet, and the retransmission request packet is designated when a transmission error occurs as described above.

For example, in the case of transmitting HD video at 20 Mbps, 1060,000 TS packets of 188 bytes will be transmitted per second. In the case where a transmission error is requested, the speed on the communication path 209 is low (that is, the transfer rate is low) when making a reproduction request to the transmitting side, and if 100 ms of transmission of error information is required A packet number is required. That is, 14 bits are required for the TS packet number, and 11 bits in the header portion are insufficient. On the other hand, as shown in the figure, the payload of the seventh compressed video packet has 8 bytes of free space. Therefore, one byte of this free space may be used to describe the missing TS packet number. Of course, 2 to 3 bytes may be used if necessary. Also, the copy flag may be described in this free space instead of the header. If there is room in the area, the number of copies, the storage time limit for permitting time shift viewing after transmission, and / or CGMS-D can also be described. If more information needs to be described, eight compressed video packets may be assigned to one TS packet instead of seven.

FIG. 4 is a block diagram showing another embodiment of the present invention. In this embodiment, in the system configuration shown in FIG. 1, the transmitting unit 117 and the receiving unit 127 are changed to the transmitting unit 230 and the receiving unit 250 in FIG. 4, respectively. In this embodiment, the transmitting unit 230 and the receiving unit 250 are connected to each other by an interface including three data lines 271, 272, 273 for transmitting video signals and a clock line 274 for transmitting clock signals. Do. The three data lines are used to transmit, for example, non-compressed video signals of red, green and blue. The clock line transmits a reference clock for data reception. In addition, it is assumed that the data line transmits 10 data during a clock cycle passing through the clock line. Multiple encoding units 231 to 233 and 2
35, output circuits 241 to 244, input circuits 251 to 254, and multiplex decoders 261 to 264 are the multiplex encoder 217, output circuit 218, input circuit 228, multiplex decoder 2 of FIG. 2, respectively.
No. 27, and the detailed description thereof will be omitted. The other blocks shown in FIG. 2 are not described here.

The case where the switch 245 selects the clock supply unit 234 corresponds to the embodiment shown in FIG.
In this embodiment, when it is necessary to increase the speed of video data transmission, the switch 245 can be used as a multiplex encoder 2.
Switching to 35, the clock line is also used as a data line, and the video data transmission amount is multiplied by 4/3. In this case, a reference clock for reproducing the input data on the TV 12 side may be used by extracting the reference clock from the signal of each data line, not the clock signal transmitted by the clock line. To this end, all or at least one of the reception signals of the input circuits 251 to 254 may be led to the PLL 256 to extract clock components from input data. A band pass filter or the like may be combined with a PLL or the like to extract the clock component. Of course, P
LL may be replaced by a DLL.

Now, there are various formats for video data, and there are many reference clocks. As described above, when the clock is extracted from the data line and it is used as a reference clock, it is necessary to accurately detect the reference clock cycle, which requires a large amount of time. In the present embodiment, in the initial state, the switch 245 selects the clock supply unit 235, and transmits the reference clock from the clock supply unit 235 to the receiving unit 250 through the clock line 274. Thus, the reference clock cycle can be easily transmitted to the receiver 250. Therefore, according to the present embodiment, there is an effect that the time for the initial setting related to the cycle of the reference clock can be shortened.

Using the configuration for transmitting information on the display capability of the TV 12 to the STB 11 described in the form of FIG. 2, the transmitting unit 230 determines whether the receiving unit 250 has a mode of using a clock line as a data line. You can tell. The time required for the initial clock cycle extraction can be communicated as well. Further, if the two-way communication path 209 shown in FIG. 2 is used, the reception unit 250 can also notify the transmission unit 230 that initialization has been completed.

FIG. 5 is a block diagram showing another embodiment of the present invention. In this embodiment, in the system configuration shown in FIG. 1, the transmitting unit 117 and the receiving unit 127 are changed to the transmitting unit 240 and the receiving unit 260 in FIG. 4, respectively. The same components as those of the embodiment shown in FIG. 4 are denoted by the same reference numerals. In the present embodiment, the PLL unit shown in FIG. 4 is also required as a component, but the description is omitted for simplification of the drawing. In this embodiment, an input circuit 255, a multiplex decoder 265, a multiplex encoder 258, and an output circuit 257 are added to the embodiment shown in FIG.

In FIG. 5, when transmitting data using a clock line, not STB11 to TV12,
Conversely, it has a function of transmitting data from the TV 12 to the STB 11. In the initial state, the output circuit 257 is in the OFF state, and the data and clock are transmitted from the transmission unit 240 of the STB 11 to the reception unit 260 as in the embodiment shown in FIG. After the start of the clock extraction operation of each data, data can be transmitted even by the clock line. At this timing, after the output circuit 244 is turned off, the operation of the output circuit 257 is started,
The data is reversely sent from the reception unit 260 to the transmission unit 240. At this time, if the clock cycle is set to be the same clock cycle as the initial state, clock extraction can be performed in the same manner as other data lines even with the clock line reversely sent. Of course, while data is reversely transmitted by the clock line, video data from the transmitting unit 240 to the receiving unit 260 is continuously transmitted by the data line.

FIG. 6 shows an example of the flow of a video signal in the case of using the function of data transmission in the reverse direction in the system configuration shown in FIG. The TV 12 sends the compressed video signal recorded in the storage unit 128 to the STB 11 by data transmission in the reverse direction by this clock line, and ST
The TS / PS conversion unit 112 and the decoding unit 113 possessed by B11 decode into a non-compressed video signal. Then, it is sent back to the TV 12 through the data line, and the display unit 129 can display a video based on the decoded video signal. Similarly, if it is necessary to display the OSD recorded in the storage unit, the clock line may be sent to the OSD circuit of the STB 11, and the video combining unit 114 may combine the video with the uncompressed video signal and send it to the TV 12.

With this function, even in a TV without a decoding unit, the video signal recorded in the storage unit can be reproduced and displayed for viewing. The same applies to a TV having a decoding unit if the decoding unit does not correspond to the encoding method used for compressed video. Furthermore, even when high compression broadcasting using a new encoding method, which did not exist at the time of TV release, is started, there is an advantage that the recording function of the TV and the time shift viewing function can be used. In addition to STD encoding, STB is also used to record compressed video that uses a copyright protection method not supported by TV, even if it is recorded on TV.
If it corresponds to that system, the recorded compressed video signal may be sent to the STB to perform copyright protection processing and decoding processing. Then, similarly to the above, by transmitting the video signal subjected to the copyright protection processing and the decoding processing back to the TV side as a non-compressed video signal, it is possible to display a video based on the video signal.

Next, an example of the circuit configuration of the input circuits 254 and 255 and the output circuits 244 and 257 shown in FIG. 5 is shown in FIG. Prior to the description of FIG. 7, a basic configuration example of the input circuit and the output circuit is shown in FIG. 8 and the operation thereof will be described. The output circuit 31 includes an output control unit 311 and transistors 312 and 31.
3. In the constant current source 314, the input circuit 32 includes termination resistors 336 and 337 and a differential discriminator 338.

The output control unit 311 turns on / off the transistors 312 and 313 (ON-OF
F) Switch to a combination of (OFF-ON) or (OFF-ON). At the time of (ON-OFF), the same current as the constant current source 314 flows in the signal line 321, and a voltage is generated across the termination resistor 336,
Since no current flows in the signal line 322, the voltage across the termination resistor 337 is zero. (OFF-
Since no current flows in the signal line 321 during ON), the voltage across the termination resistor 336 is 0, the signal line 3
The same current as that of the constant current source 314 flows through 22 and a voltage is generated across the termination resistor 337. It is so-called differential transmission. The potential difference of the termination resistance is detected by the differential discriminator 338 to determine the logic level.

The configuration of FIG. 7 is a configuration in which the configurations of the input circuit and the output circuit shown in FIG. Since two output circuits connected in parallel can not be operated simultaneously,
The output control unit 331 (or 311) of the output circuit that is not in the operating state controls the transistors 312 and 313 (or the transistors 332 and 333) to be (OFF-OFF). Both input circuits may be in the operating state, and the terminating resistors 316 and 3 on the unused side may be used.
17 (or 336, 337) may be separated. Also, the differential discrimination unit 318 (or 338)
The power consumption may be reduced by stopping the operation of.

FIG. 9 is a block diagram showing another embodiment of the present invention, in which two TVs 15 are used as a video processing apparatus.
And 16 are used. That is, this embodiment is an example in which the STB 11 shown in FIG. 1 has a display unit and is a TV. Similar to the embodiment shown in FIG.
The multiplexed video signal obtained by multiplexing the uncompressed video signal and the compressed video signal is sent from the TV 15 to the TV 16 through 4 and the uncompressed video signal is displayed on the display unit 129 of the TV 16. On the other hand, the compressed video is recorded by the storage unit 128, reproduced at a time desired by the user, and displayed on the display unit 129.

One configuration example of the transmission / reception units 157 and 167 is shown in FIG. In this example, both the data line 271 and the clock line 274 enable bi-directional transmission. The specific configuration of the input circuit and the output circuit may be similar to that shown in FIG. When transmitting data from the transmitting and receiving unit 157 to 167, the data is transmitted from the multiplex coding unit 231 through the output circuit 241, and the input circuit 251 and the multiplex decoding unit 26.
It is supplied to 1. On the other hand, the clock signal is supplied from the clock supply unit 235 through the output circuit 244 to the input circuit 254 and the PLL 283. Conversely, when transmitting data from the transmitting / receiving unit 167 to 157, the data is transmitted from the multiplex coding unit 282 through the output circuit 281 to the input circuit 27.
1 and to the multiplex decoder 272. On the other hand, the clock signal is transmitted from the clock supply unit 284 to the input circuit 255 and the PLL 274 via the output circuit 257.

As described above, if the TV 15 or 16 is provided with the function of transmitting the video signal in reverse, it operates as follows. That is, as shown by the broken line in FIG. 9, the compressed video recorded by the storage unit 128 of the TV 16 is sent to the TV 15, and the TS / PS converter 152 and the decoding unit 153 of the TV 15 form an uncompressed video signal. Can be displayed. Of course, TV16 TS
After the uncompressed video signal is formed by the / PS converter 122 and the decoder 123, it is transmitted to the TV 15,
It may be displayed on the display unit 159.

According to the present embodiment, various resources of the digital tuner, the storage unit, the decoding unit, and the copyright protection can be interchanged between two TVs (video processing devices) connected to each other.

In the above embodiments, examples of STB and TV have been shown as video processing devices, but recorders and DV
The same effect can be expected with a combination of a video signal source such as a D player or a monitor.

Using the embodiments of the present invention described in detail above, it is possible to simultaneously transmit a non-packetized real-time uncompressed video signal and a packetized compressed video signal to one interface. That is, it is possible to transmit a plurality of digital video signals according to different standards by one interface. In a video processing apparatus such as a TV using this, an HDD is used in which a compressed video signal transmitted simultaneously is displayed in the TV while displaying an uncompressed video signal from a signal source such as STB on the display unit of the TV in real time. , Etc., and can be viewed at another time. That is, it is possible to simultaneously display both real-time video and time-shifted video of a certain video content on one screen, and both real-time viewing and time-shift viewing can be performed for the video content.

Furthermore, by using a high-speed transmittable physical layer of the uncompressed video transmission interface for data transmission, when transmission of the uncompressed video signal is unnecessary, transmission of a large number of compressed video signals or video transfer in a short time There is also an effect that

Furthermore, according to the above-described embodiment, various copyright protection technologies can be appropriately coped with, and there is also an effect that good viewing within fair use conditions can be realized.

The present invention is applied to a video signal transmission method for multiplexing and transmitting a non-compressed video signal and a compressed video signal by one interface. In particular, the present invention is effective when transmitting and receiving video signals between video processing devices, for example, between a video signal source such as STB and a video display device such as a TV.

11 STB, 12 TV, 14 Mobile viewer 31 Output circuit 32 Input circuit 33-34 Input / output circuit 101-102 RF signal 103-104 Video signal interface 111-121 Digital tuner, 112 to 122 ... TS / PS conversion unit, 113, 123, 133 ... Decoding unit, 114, 124 ... Video combining unit, 115, 125 ...
OSD unit, 116, 126 ... control unit, 117, 230, 240 ... transmission unit, 127, 250
, 260: receiver, 128, 138, storage: 129, 139: display, 130: code converter, 131, 132: interface, 211, 212, 213: packet generator, 214, 224: buffer, 215 ... ECC encoding unit, 216 ... interleaving unit, 21
7: Multiple encoding unit, 218: Output circuit, 219: Capability identification unit, 220, 230: Communication circuit, 221 to 223: Packet decoding unit, 225: ECC decoding unit, 226: De-interleaving unit, 227: Multiple decoding Part 228: Input circuit 229: Capability transmitting part 231 to 234, 2
58, 282 ... Multiple encoding unit, 241 to 244, 257 ... Output circuit, 235, 284 ... Clock supply unit, 251 to 255 ... Input circuit, 256, 274, 283 ... PLL unit, 261
-265, 272 ... Multiplexing unit, 311, 331 ... Output control unit, 312-313, 332
~ 333 ... transistor, 314, 334 ... current source, 316-317, 337-336 ...
Termination resistance 318, 338 differential discrimination unit 401 multiplexing unit 402 copy flag assignment unit 403 encryption processing unit 404 transmission coding unit 411 transmission code decoding unit 412
... Decryption unit, 413 ... Copy flag extraction unit, 414 ... Separation unit

Claims (2)

A display device,
A receiver capable of receiving a digital video signal and a clock signal from an external video signal source;
A display unit for displaying an image using the digital image signal received by the receiving unit and a clock signal;
The receiving unit has a first receiving mode and a second receiving mode as modes for receiving a digital video signal and a clock signal from an external video signal source,
In the first reception mode, the reception unit may be configured such that the first digital video signal uncompressed from the external video signal source and the first digital video signal are separated electrically or physically. 1
Receive the clock signal of
The receiving unit, when the second reception mode, receives the second non-compressed digital video signal from the external video signal source, a second clock signal which is superimposed on the second digital video signal ,
The receiving unit has a function of transmitting information to an external video signal source, and the display device transmits information indicating that reception in the second reception mode is possible to the external video signal source.
A display device characterized by The display device according to claim 1, wherein the receiving unit is configured to receive the second signal in the second reception mode.
A display unit for extracting the second clock signal from the digital video signal of

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