JP6695465B2 - Display device - Google Patents

Description

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

With the spread of HD (High Definition) broadcasting by terrestrial digital broadcasting and the release of the Blu-ray (registered trademark) recorder that can record HD broadcasting, high-quality HD video can be recorded without image quality degradation.
There is an increasing need for a digital video interface that can be transmitted to V. As an interface for non-compressed video signal transmission, DVI (Digital Visual I
nterface), HDMI, and HDMI (High Definition Multimedia) licensed by LLC.
Interface, registered trademark). Further, as an interface for transmitting a video signal compressed by MPEG or the like, there are IEEE 1394, LAN and the like. Non-Patent Document 1 discloses, for example, a conventional technique in which an interface for transmitting an uncompressed video signal is applied to a television device. This discloses packetizing video format information in a non-packetized uncompressed video signal for multiplex transmission. Also, in HDMI, audio data is also packetized and transmitted. Non-Patent Document 2 describes, for example, a conventional technique for applying an interface for transmitting a compressed video signal to a television device. In addition, as an example of copyright protection technology used for these, HDCP (High-bandwidth Digital
nt Protection System, but for compressed video, DTCP (Digital Transmission Conte
nt Protection).

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

JP-A-8-307455

Standard "CEA-861-B" CEA 2002 USA Standard “CEA-775-B” CEA 2004 USA

It is expected that the number of types of signal sources will increase in the future, and TVs will increasingly require input interfaces for non-compressed video signals and compressed video signals. However, when two types of interfaces having different connectors are provided in a television device (television receiver, etc.), it is necessary to secure a connector space and prepare two types of cables. Patent Document 1
A method of simultaneously transmitting an uncompressed video signal and a compressed video signal is disclosed, which is a transmission method suitable for a broadcasting station. That is, in the transmission method described in Patent Document 1, since the uncompressed video signal is packetized, it is difficult to apply this to a television device for general households.

Also, the types of copyright protection technology used will increase according to the types of interfaces handled. Even in such a case, it is necessary to appropriately support copyright protection technology.

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

In order to solve the above object, one embodiment of the present invention is a display device, which includes an uncompressed digital video signal encrypted by a first encryption method from an external video signal source , and a second encryption. A receiving unit capable of receiving a multiplexed video signal in which a compressed digital video signal encrypted by an encryption method is multiplexed , a tuner unit for receiving a digital broadcast signal, and a display unit, and the display device is at least There is a first display mode, a second display mode, and a third display mode, and in the first display mode, the receiving unit extracts the uncompressed digital video signal from the received multiplexed video signal. Separating the uncompressed digital video signal separated by the first encryption method, the display unit displays an image based on the decrypted uncompressed digital video signal, In the second display mode, the receiving unit separates the compressed digital video signal from the received multiplexed video signal, and decrypts the separated compressed digital video signal according to the second encryption method. image, and the display unit displays an image based on the compressed digital video signal that is the decryption processing, in the third display mode, the display unit, based on the digital broadcast signal received by the tuner section Is displayed.

According to the present invention, it is possible to provide an interface common to non-compressed video signals and compressed video signals. In addition, suitable copyright protection can be achieved.

Block diagram showing a first embodiment of a video processing apparatus according to the present invention Block diagram showing a configuration example of a transmission unit and a reception unit of the video processing device Diagram showing an example of packet structure of compressed video Block diagram showing a second embodiment of a video processing apparatus according to the present invention Block diagram showing a third embodiment of a video processing apparatus according to the present invention Block diagram showing the flow of video signals of the video processing device in the third embodiment. The figure which shows the example of 1 structure of the output circuit and input circuit in 3rd Example. A diagram showing a basic configuration example of an output circuit and an input circuit of the video processing device. Block diagram showing a fourth embodiment of a video processing device according to the present invention. The figure which shows the example of 1 structure of the output circuit and input circuit in 4th Example.

Hereinafter, the best working liquid of the present invention will be described below with reference to the drawings. The present invention simultaneously transmits an uncompressed video signal and a compressed video signal through a common (same) interface. Then, such transmission is realized while maintaining the interoperability with the uncompressed digital interfaces such as DVI and HDMI which have started to spread. In the embodiment described below, the video processing device includes, for example, an STB having a built-in digital tuner, a television display device, and the like (hereinafter referred to as “TV”). Of course, the following embodiments can be applied to devices other than these devices.

FIG. 1 is a block diagram of a first embodiment according to the present invention, which is an example of a video processing device ST.
A B (Set Top Box) 11, a TV 12 which is another example of a video processing device, 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 or a cable, and demodulates a transport stream (hereinafter abbreviated as TS) of a compressed video by a digital tuner 111. The demodulated TS is converted into a program stream (hereinafter PS) by the TS / PS converter 112.
Is omitted), and the decoding unit 113 obtains an uncompressed video signal. This uncompressed video signal and OSD
The image synthesizing unit 114 synthesizes the OSD screen generated by the unit 115. This uncompressed video signal is not packetized and is transmitted from the transmission unit 117 via the video signal interface 103 to the T
It is transmitted to the receiving unit 127 of V11. The uncompressed video signal received by the receiving unit 127 is sent to the display unit 129 via the video synthesizing unit 124. The display unit 129 displays a real-time video screen based on this non-compressed video signal and provides it to the user. The control units 116 and 126 not only control the multiplexing of the transmission unit 117 and the reception unit 127 and the communication status, but also control the TV.
The display capability of 12 (characteristics and specifications relating to image display) is transmitted to the STB 11, and the operation of adjusting the video signal sent from the STB 11 to the display characteristic of the TV 12 is performed. In addition, bidirectional communication control can be performed so that the STB 11 and the TV 12 can cooperate with each other by exchanging remote control codes and the like.

On the other hand, the TS output of the digital tuner 111 and the OSD output of the OSD section 115 are
It is also sent to 7. The transmitter 117 multiplexes packet data of TS and OSD into an uncompressed video signal to generate a multiplexed video signal, and transmits the multiplexed video signal to the receiver 127 via the interface 103. The receiver 127 receives the uncompressed video signal, the TS and the OS from the received multiplexed video signal.
Separate D. The TS and OSD separated or extracted by the receiving unit 127 are stored in the storage unit 12.
Accumulated in 8. The storage unit 128 is composed of, for example, a hard disk. It may be configured with a semiconductor memory such as a flash memory. As a result, video recording based on TS is performed. The recorded TS is read from the storage unit 128 according to a user's instruction, and TS / PS
The conversion unit 122 extracts PS, and the decoding unit 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 an uncompressed OSD video signal. This OSD video signal is video-synthesized with the non-compressed video signal output from the decoding unit 123 in the video synthesis unit 124. The uncompressed video signal in which the recorded video and the OSD are combined is displayed on the display unit 129 and viewed in the time zone desired by the user (time-shift viewing).
can do.

If the TV 12 is equipped with the digital tuner 121, it can receive a digital broadcast or the like similarly to the STB 11 and record the TS in the storage unit 128 for time shift viewing. Furthermore, the uncompressed video signal obtained through the TS / PS conversion unit 122 and the decoding unit 123, and ST
It is also possible to combine the uncompressed video signal sent from B11 with the video composition unit 124 and display the two screens simultaneously on the display unit 129. The digital tuners 111 and 121 may receive different channels and combine two screens. Further, 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 into two screens. S
If the TB 11 is equipped with a digital tuner 111 (that is, a digital tuner capable of receiving channels that cannot be received by the digital tuner of the TV 12) different from the digital tuner built in the TV 12 with a digital tuner, real-time viewing of channels that the TV 12 cannot receive. It also has the effect of enabling time-shifted viewing. Further, there is an effect that even after the STB 11 is removed from the TV 12, the video received by the STB and remaining in the storage unit 128 can be viewed.

It is obvious that the compressed video signal and the non-compressed video signal that are multiplexed by the transmission unit 117 may be different programs as long as the digital tuner 111 is capable of simultaneously receiving 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 less data transmission than TS.

The compressed video signal recorded in the storage unit 128 is subjected to further high compression and code conversion such as transmission format in 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 the storage unit 1
38. After transferring the video signal, the mobile viewer 14 displays the interface 10
Separated from 4, it can be carried to any place. Then, the mobile viewer 14 decodes the video stored in the storage unit 138 by the decoding unit 133 and displays the video on the display unit 139 according to the instruction from the user. As a result, the user can view the desired video at any place using the mobile viewer 14.

FIG. 2 is a block diagram showing a configuration example of the transmission unit 117 and the reception unit 127. The operation example will be described below. Audio data 20 corresponding to the uncompressed video from the video composition unit 114 (FIG. 1)
2. TS output 203 from digital tuner 111 (FIG. 1) and OSD unit 115 (FIG. 1)
) OSD data 204 is input to the packet generators 211, 212, and 213 of the transmitter 117, respectively. The packet generators 211 to 213 form packets suitable for multiplexing on the uncompressed video signal based on the respective input signals. The buffer unit 214 receives the packets from the packet generation units 211 to 213, rearranges them according to the priority order of packet transmission, and sequentially transmits them in accordance with the blanking period of the uncompressed video signal. Buffer section 2
In the packets rearranged in 14, the ECC coding unit 215 inserts an error correction code. Then, interleaving section 216 performs bit-wise interleaving processing to improve resistance to burst errors, and the result is sent to multiplexing code section 217. The multiplexing encoder 217 multiplexes the uncompressed video signal output 201 from the video synthesizer 114 (FIG. 1) with the multiplexing unit 401 that multiplexes the interleaved packet, and a copy control flag for the uncompressed video signal. A copy flag assigning unit 402 for assigning, an encryption processing unit 403 for encrypting a video signal, and a transmission encoding unit 404 for performing transmission encoding. The output of the multiplexing encoder 217 is transmitted to the input circuit 228 of the receiver 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 for decoding transmission encoding, a decryption unit 412 for decrypting the video signal, a copy flag extraction unit 413 for extracting a copy flag, and an uncompressed video signal 291. And a separating unit 414 for separating other packet data. The packet data is interleaved by the deinterleave circuit 226 to be restored to the original signal, and the ECC decoding unit 225 performs error correction, and then is transmitted to the buffer unit 224. Buffer section 2
24 temporarily holds the packet data and outputs the packet data 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 the audio data 292 of the uncompressed video signal, the TS 293, and the OSD data 294. These are the data sent from the receiving unit 127 to the storing unit 128 in FIG.

The capability transmitting unit 229 transmits information regarding the display capability (display specifications and / or display characteristics) of the TV to the capability identifying unit 219 via the communication line 208. The ability identifying unit 219 identifies the display ability of the TV 12 based on the information about the display ability and outputs the 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 this embodiment is transmitted. With such a configuration, the multiplexed video signal is not transmitted to the TV that does not have the configuration capable of inputting the multiplexed video signal (that is, the TV having the conventional interface), and only the non-compressed video signal is transmitted. Therefore, the interoperability with the TV having the conventional interface is secured. As a configuration for transmitting the capability on the TV 12 side, it is preferable to use, for example, an EDID system specified by VESA. In this embodiment, the information about the display capability of the TV includes, for example, the horizontal and vertical resolutions of the display unit 129, the color reproduction range, the gamma characteristic, and the like. Furthermore, in order to effectively use this embodiment,
In addition to the above, as information regarding the display capability of the TV, for example, a video format indicating a display timing of a multiplexed video signal, a bit rate of a compressed video, a list of decodable coding methods, a storage capacity of a storage unit 128, and a free capacity. , It is good to add additional capabilities such as maximum recording speed and send.

In addition to the above, the capability transmission unit 229 and the capability identification unit 219 are also used for device authentication and capability confirmation of cryptographic processing. For example, in DVI and HDMI, Digital Content Prot
There is HDCP licensed by ection, LLC. In the future, with the diversification of contents, it may be necessary to manage a plurality of cryptographic processes for each content or country. In such a case, in the present embodiment, the receiving side of the video signal is provided with a plurality of elements for device authentication and encryption processing, and which process is appropriate by referring to the device authentication start protocol from the transmitting side. An automatic discrimination / selection circuit for discriminating and selecting may be provided. On the other hand, the sender discriminates the type of content, the country in which it is used, etc., and selects the appropriate encryption process to switch to it.
A selection circuit may be provided. For example, the region code recorded on the DVD disc may be read and the encryption process may be selected by the region code. In television broadcasting, the broadcast station may be discriminated and the encryption process may be selected.

In some cases, fixed cryptographic processing may be required depending on the regulations of the country and business operators. In such a case, if a dedicated image processing device is newly prepared, the development cost may increase. Therefore, the video processing apparatus is provided with a plurality of cryptographic processing units capable of executing a plurality of types of cryptographic processing, and the type of cryptography is determined
A discrimination / selection circuit for selecting an encryption processing unit corresponding to the discrimination result may be provided. At this time, the discrimination / selection circuit may automatically discriminate the type of cipher and perform a selection operation. Further, a setting circuit may be provided to allow the user to set the type of encryption processing. Also,
With this setting circuit, one of the plurality of cryptographic processes may be preset and fixed at the time of shipment. In this case, the procedure for changing the setting of the cryptographic process (for example, STB11 or TB) is performed so that the user cannot arbitrarily change the setting of the cryptographic process by the setting circuit.
It is advisable to keep the command (for V12, password input, etc.) secret from the user. When changing the setting of the encryption process after shipping, make it possible to download the procedure related to the above setting change from, for example, broadcasting and / or the Internet under a specific condition (for example, a fee charged by the user). May be. In this way, the procedure for secretly changing the setting is disclosed to the user under a specific condition, and the change of the encryption process by the user becomes effective. When implementing this example, such a service may be provided. Furthermore, the procedure relating to the setting change may be stored in a storage medium such as a DVD and distributed to the user as a setting change DVD.

Furthermore, when various types of cryptographic processing are used, the image quality can be changed by limiting the resolution and the bit rate of the compressed video signal depending on the grade of the cryptographic processing.

The communication circuits 220 and 230 perform bidirectional 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 bidirectional communication in this embodiment, a bidirectional communication configuration such as CEC specified by HDMI can be applied.
If an error that cannot be corrected by the ECC decoding unit 225 occurs, the TV 12 sets the communication path 2
The retransmission request may be transmitted to the STB via 09, and the STB 11 may retransmit the compressed video signal having the error in response to the retransmission request. This allows error-free recording. The compressed video signal packet included in the compressed / non-compressed video signal multiplexed signal 207 is provided with an identification number such as a time stamp or a symbol so that the TV 12 sends the STB 11 to the STB 11 together with a retransmission request. You may make it transmit. This allows
When a retransmission request occurs, the STB 11 can refer to the error packet number or symbol and retransmit only the error packet. Therefore, the STB 11 does not need to retransmit an error-free packet, which improves transfer efficiency.

The packet sending process in the buffer unit 214, that is, the packet rearranging process according to the priority order will be described below. There is a limit to the transmission capacity of packets that are multiplexed and transmitted with an uncompressed video signal. The packet to be sent with the highest priority is the voice of the non-compressed 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 priority, and the arrangement thereof is determined to the highest priority. Compressed video packets and OSD packets are placed in the remaining areas. The priority order of the compressed video packet and the OSD packet is arbitrarily determined. However, when the OSD is associated with (or has a high degree of association with) the uncompressed video signal, the priority of the OSD packet is set higher than that of the compressed video packet. May be. When it is highly necessary to use the compressed video in the TV 12, the priority of the compressed video packet may be set higher than that of the OSD packet.

When sending the compressed video to the storage unit 128, it is necessary to arrange the packets so as not to exceed the maximum recording speed of the storage unit 128. Alternatively, the 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 almost in real time, it is necessary to control the packet transmission amount according to the coding speed of the compressed video.

Depending on the format of the non-compressed video signal, the packet transmission capacity for multiplexing the compressed video signal may be insufficient. In this case, the pixel clock of the uncompressed video signal may be multiplied by n (n is 2 or more), or a format in which the blanking period of the uncompressed video signal is widened may be used. By doing so, 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 a compressed video. As shown in FIG.
Packet is a 4-byte header and 184-byte adaptation (or payload)
Of 188 bytes in total. On the other hand, in the gap of the uncompressed video signal (for example, the blanking period), T
In order to multiplex S, it is better that the packet size is small. FIG. 3 shows a case where a packet is composed of a 3-byte header and a 28-byte payload. TS packet 188
Bytes may be divided into payloads of 7 compressed video packets and transmitted.

An example of the structure of the header will be described below. The first byte represents the packet type such as compressed video and audio. A total of 16 bits of the second byte and the third byte may be allocated to the order of TS packets divided into seven (3 bits), the TS packet number (11 bits), and the copy control flag (2 bits). A time stamp is also included in the TS itself, and 11 bits of the TS packet number in the header may be omitted by diverting the time stamp, but it is easier to use if it is described in the header part. This TS packet number is used as an identification number for identifying a packet to specify the retransmission request packet when the above-mentioned transmission error occurs.

For example, when transmitting HD video at 20 Mbps, 106,000 TS packets of 188 bytes are transmitted per second. When a reproduction request is made to the transmitting side when a transmission error occurs, if the speed of the communication path 209 is slow (that is, the transfer rate is low) and 100 mS is required to transmit the error information, a TS that discriminates at least 10,000 TS packets. Packet number required. That is, 14 bits are required for the TS packet number, and 11 bits in the header part are not sufficient. On the other hand, as shown in the figure, the payload of the seventh compressed video packet has an empty space of 8 bytes. Therefore, 1 byte of this empty area may be used for describing the TS packet number which is insufficient. Of course, you may use 2-3 bytes as needed. Also, the copy flag may be described in this free area instead of the header. If there is a margin in the area, the number of copies, a storage limit time 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 instead of seven may be applied to one TS packet.

FIG. 4 is a block diagram showing another embodiment of the present invention. In this embodiment, the transmitter 117 and the receiver 127 of the system configuration shown in FIG. 1 are replaced with the transmitter 230 and the receiver 250 of FIG. 4, respectively. In this embodiment, the transmitter 230 and the receiver 250 are connected to each other through an interface including three data lines 271, 272, 273 for transmitting a video signal and a clock line 274 for transmitting a clock signal. To do. The three data lines are used for transmitting uncompressed video signals of red, green, and blue, for example. The clock line transmits a reference clock for data reception. Further, the data line is assumed to send 10 pieces of data during the clock cycle passing through the clock line. Multiplex encoders 231-233 and 2
35, the output circuits 241-244, the input circuits 251-254, and the multiplex decoding units 261-264 are respectively the multiplex encoding unit 217, the output circuit 218, the input circuit 228, and the multiplex decoding unit 2 of FIG.
27, and detailed description thereof will be omitted. The description of the other blocks shown in FIG. 2 is omitted here.

The case where the switch 245 selects the clock supply unit 234 corresponds to the embodiment of FIG.
In the present embodiment, when it is necessary to speed up the video data transmission, the switch 245 is set to the multiple encoding unit 2.
By switching to 35, the clock line is also used as a data line to multiply the video data transmission amount by 4/3. In this case, the 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. For this purpose, all or at least one of the reception signals of the input circuits 251 to 254 may be guided to the PLL 256 and the clock component may be extracted from the input data. A bandpass filter or the like may be combined with a PLL or the like to extract the clock component. Of course, P
The LL may be replaced with the DLL.

Now, there are various formats for video data, and there are many reference clocks. When the clock is extracted from the data line and used as the reference clock as described above, it is necessary to accurately detect the reference clock cycle, which requires a lot 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 reception unit 250 via the clock line 274. Thereby, the reference clock cycle can be easily transmitted to the receiving section 250. Therefore, according to this embodiment, there is an effect that the time for initial setting related to the cycle of the reference clock can be shortened.

If the configuration for transmitting the information about the display capability of the TV 12 to the STB 11 described in the form of FIG. 2 is used, the reception unit 250 determines whether the transmission unit 230 has a mode in which the clock line is used as the data line. Can be communicated to. The time required to extract the default clock period can also be reported. Further, by using the bidirectional communication path 209 shown in FIG. 2, it is possible to inform the transmitting unit 230 from the receiving unit 250 that the initial setting is completed.

FIG. 5 is a block diagram showing another embodiment of the present invention. In the present embodiment, the transmitter 117 and the receiver 127 in the system configuration shown in FIG. 1 are replaced with the transmitter 240 and the receiver 260 of FIG. 4, respectively. The same components as those in the embodiment shown in FIG. 4 are designated by the same reference numerals. In the present embodiment, the PLL section shown in FIG. 4 is also necessary as a component, but the description is omitted for the sake of simplification of the drawing. In this embodiment, an input circuit 255, a multiplex decoding unit 265, a multiplex encoding unit 258, and an output circuit 257 are added to the embodiment shown in FIG.

In FIG. 5, when sending data using the clock line, the STB 11 is not the TV 12,
On the contrary, it is characterized by having 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 transmits data and a clock from the transmitter 240 of the STB 11 to the receiver 260 as in the embodiment shown in FIG. After the clock extraction operation of each data is started, the data can be transmitted even on the clock line. At this timing, after turning off the output circuit 244, the operation of the output circuit 257 is started,
Data is sent backward from the receiving unit 260 to the transmitting unit 240. At this time, if the clock cycle is set to the same clock cycle as the initial state, the clock can be extracted by the reversely transmitted clock line in the same manner as other data lines. Of course, while the data is being sent back on the clock line, the video data is continuously sent from the transmitter 240 to the receiver 260 on the data line.

FIG. 6 shows an example of the flow of a video signal when the reverse data transmission function is used 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 reverse data transmission using this clock line, and ST
The TS / PS converter 112 and the decoder 113 included in B11 decode the uncompressed video signal. Then, the data can be sent back to the TV 12 through the data line, and the video based on the decoded video signal can be displayed on the display unit 129. If the OSD recorded in the storage unit also needs to be displayed, it may be sent to the OSD circuit of the STB 11 by the clock line in the same manner, and the video compositing unit 114 may composite the image with the non-compressed video signal and send it to the TV 12.

With this function, even a TV without a decoding unit can reproduce and display the video signal recorded in the storage unit for viewing. The same applies to a TV having a decoding unit even if the decoding unit does not support the encoding method used for compressed video. Further, there is an advantage that the recording function and the time shift viewing function of the TV can be used even when a high-compression broadcast using a new encoding method that did not exist at the time of the TV release is started. In addition to the encoding, even if a compressed video that uses a copyright protection method that is not supported by the TV is recorded on the TV, the STB
If the method is compatible with that method, the recorded compressed video signal may be sent to the STB for copyright protection processing and decoding processing. Then, similarly to the above, by sending back the video signal that has been subjected to the copyright protection processing and the decoding processing to the TV side as an uncompressed video signal, it is possible to display a video based on the video signal.

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

The output control unit 311 controls the ON / OFF operation of the transistors 312 and 313 by (ON-OF
F) or (OFF-ON) combination. At the time of (ON-OFF), the same current as the constant current source 314 flows through the signal line 321 to generate a voltage across the terminating resistor 336,
Since no current flows through the signal line 322, the voltage across the terminating resistor 337 becomes zero. (OFF-
When ON), no current flows in the signal line 321, so the voltage across the terminating resistor 336 is 0, and 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 terminating resistor 337. This is so-called differential transmission. The potential difference of the terminating resistance is detected by the differential discrimination unit 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. 8 are used as they are and are connected in parallel. Since two output circuits connected in parallel cannot be operated at the same time,
The output control unit 331 (or 311) of the output circuit which is not in the operating state controls the transistors 312 and 313 (or the transistors 332 and 333) to be (OFF-OFF). Both of the input circuits may be in the operating state, or the terminating resistors 316 and 3 on the unused side may not be used.
17 (or 336, 337) may be separated. In addition, the differential discrimination unit 318 (or 338)
) Operation may be stopped to reduce the power consumption.

FIG. 9 is a block diagram showing another embodiment of the present invention, in which two TVs 15 are used as a video processing device.
And 16 are used. That is, the present embodiment is an example in which the STB 11 shown in FIG. 1 has a display section and becomes a TV. Similar to the embodiment shown in FIG. 1, the video interface 10
4, the TV 15 sends a multiplexed video signal obtained by multiplexing the uncompressed video signal and the compressed video signal to the TV 16, 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 in the storage unit 128, reproduced at the time desired by the user, and displayed on the display unit 129.

FIG. 10 shows a configuration example of the transmission / reception units 157 and 167. In this example, both the data line 271 and the clock line 274 are capable of bidirectional transmission. The specific configurations of the input circuit and the output circuit may be the same as those in FIG. 7. When transmitting data from the transmitting / receiving unit 157 to 167, the data passes from the multiplex encoding unit 231 through the output circuit 241 to the input circuit 251 and multiplex decoding unit 26.
1 is supplied. On the other hand, the clock signal is supplied from the clock supply unit 235 to the input circuit 254 and the PLL 283 via the output circuit 244. Conversely, when transmitting data from the transmitting / receiving unit 167 to 157, the data is transmitted from the multiplex encoding unit 282 to the input circuit 27 via the output circuit 281.
1 and the multiplex decoding unit 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.

In this way, if the TV 15 or 16 is provided with the function of reversely transmitting the video signal, 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, the TS / PS conversion unit 152 and the decoding unit 153 of the TV 15 form an uncompressed video signal, and the display unit 159. Can be displayed with. Of course, TS of TV16
The / PS conversion unit 122 and the decoding unit 123 form an uncompressed video signal and then transmit it to the TV 15.
It may be displayed on the display unit 159.

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

In the above embodiments, the STB and the TV are shown as the image processing apparatus, but the recorder and the DV are used.
Similar effects can be expected by combining a video signal source such as a D player and a monitor.

Utilizing the embodiments of the present invention described in detail above, a non-packetized real-time uncompressed video signal and a packetized compressed video signal can be simultaneously transmitted to one interface. That is, a single interface can transmit a plurality of digital video signals according to different standards. In a video processing device such as a TV using this, an uncompressed video signal from a signal source such as an STB is displayed in real time on a display unit of the TV, and a compressed video signal transmitted at the same time is stored in the HDD of the TV. It is possible to record the data in a storage device such as the above and watch it at another time. That is, both real-time video and time-shifted video of a certain video content can be simultaneously displayed on one screen, and both real-time viewing and time-shift viewing of the video content are possible.

Furthermore, by using the high-speed transmission physical layer of the uncompressed video transmission interface for data transmission, when it is not necessary to transmit uncompressed video signals, it is possible to transmit many compressed video signals or transfer video in a short time. There is also an effect that becomes possible.

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

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 using one interface. In particular, it is effective when transmitting and receiving a video signal 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 tuners 112 to 122 ... TS / PS converters 113, 123, 133 ... Decoders 114, 124 ... Image synthesizers 115, 125 ...
OSD unit, 116, 126 ... Control unit, 117, 230, 240 ... Transmitting unit, 127, 250
260 ... Reception unit, 128, 138 ... Accumulation unit, 129, 139 ... Display unit, 130 ... Code conversion unit, 131, 132 ... Interface unit, 211, 212, 213 ... Packet generation unit, 214, 224 ... Buffer, 215 ... ECC encoding unit, 216 ... Interleaving unit, 21
7 ... Multiple encoding part, 218 ... Output circuit, 219 ... Capability identification part, 220, 230 ... Communication circuit, 221-223 ... Packet decoding part, 225 ... ECC decoding part, 226 ... De-interleave part, 227 ... Multiplex decoding Section, 228 ... Input circuit, 229 ... Capability transmission section, 231-234, 2
58, 282 ... Multiplex encoding section, 241-244, 257 ... Output circuit, 235, 284 ... Clock supply section, 251-255 ... Input circuit, 256, 274, 283 ... PLL section, 261
-265, 272 ... Multiplexing decoding part, 311, 331 ... Output control part, 312-313, 332
... 333 ... Transistors, 314, 334 ... Current sources, 316-317, 337-336 ...
Termination resistors, 318, 338 ... Differential discrimination section, 401 ... Multiplexing section, 402 ... Copy flag adding section, 403 ... Cryptographic processing section, 404 ... Transmission coding section, 411 ... Transmission coding / decoding section 412
... decryption unit, 413 ... copy flag extraction unit, 414 ... separation unit

Claims (5)

A display device,
Receives a multiplexed video signal from an external video signal source in which a non-compressed digital video signal encrypted by the first encryption method and a compressed digital video signal encrypted by the second encryption method are multiplexed. Possible receivers,
A tuner section for receiving digital broadcast signals,
And a display unit,
The display device has at least a first display mode, a second display mode, and a third display mode,
In the first display mode, the receiver separates the non-compressed digital video signal from said multiplexed video signal thus received, encrypted by the first encryption scheme separate the non-compressed digital video signal The display unit displays a video based on the decoded non-compressed digital video signal,
In the second display mode, the receiving unit separates the compressed digital video signal from the received multiplexed video signal, and decrypts the separated compressed digital video signal according to the second encryption method. Processing, the display unit displays an image based on the decrypted compressed digital image signal,
In the third display mode, the display unit displays an image based on the digital broadcast signal received by the tuner unit,
A display device characterized by the above. The display device according to claim 1, wherein
The information for the capability confirming the cryptographic processing of the display device, a display device and transmits to the external video signal source. The display device according to claim 2 , wherein
The display device, wherein the receiving unit includes a communication circuit that communicates with an external video signal source via a bidirectional communication path, and the communication circuit transmits the information to the external video signal source. The display device according to claim 1, wherein
The display device, wherein the first encryption method and the second encryption method can be selected by a user. The display device according to claim 1, wherein
The display device, wherein the receiving unit receives the multiplexed video signal from an external video signal source via an HDMI cable.

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