Video broadcasting system and video receiving system

Abstract

The present invention provides a video relay system and a video receiving system, wherein the encoding device in the video relay system encodes the received ultra-high-definition video signal to obtain an ultra-high-definition video TS stream signal, and sends the ultra-high-definition video TS stream signal to a signal frequency conversion modulation device; the signal frequency conversion modulation device modulates and frequency converts the received ultra-high-definition video TS stream signal to obtain a processed TS stream signal; the signal power amplification device is used to power amplify the processed TS stream signal to obtain a power amplified signal; the waveguide device transmits the power amplified signal to the satellite transmitting antenna, so that the satellite transmitting antenna transmits the power amplified signal to the satellite for forwarding by the transponder on the satellite. After the ground receives the signal forwarded by the satellite, it performs frequency conversion power amplification, demodulation and decoding to restore the ultra-high-definition video signal for playback or recording. The present invention improves the transmission efficiency of 8K ultra-high-definition video signals.

Description

Technical Field

[0001] The present invention relates to the field of satellite broadcasting technology, and in particular to a video broadcasting system and a video receiving system. Background Art

[0002] According to ITU-R BT.2020 "Parameter Values ​​for Program Production and International Exchange of Ultra-High Definition Television Systems" and GY / T307-2017 "Parameter Values ​​for Program Production and Exchange of Ultra-High Definition Television Systems", the resolution of ultra-high definition images is 3840×2160 and 7680×4320, which are commonly known as 4K and 8K. From the perspective of TV terminals, TV sets that can receive, process and display ultra-high definition programs are called ultra-high definition TVs. The resolution of a 4K ultra-high definition TV screen is 3840×2160 pixels, and the clarity can reach 2160 TV lines. The resolution of an 8K ultra-high definition TV screen is 7680×4320 pixels, and the clarity can reach 4320 TV lines. For the transmission of ultra-high definition video, according to the H.265 standard (350-1000 compression ratio), the transmission rate of 4K video transmission is at least 12-40Mbps, and the transmission rate of 8K video transmission is at least 48-160Mbps. Currently, there are also some research applications of 10K ultra-high-definition video, 12K ultra-high-definition video and 16K ultra-high-definition video underway.

[0003] Since the data volume of 8K ultra-high-definition video and ultra-high-definition video with a resolution of 8K or above is very large, the transmission of 8K ultra-high-intensity video is very technically difficult and requires a very high technical system for transmission. At present, the main technical solutions for video transmission include: open radio and television signal transmission tower broadcast transmission, cable TV network transmission, IPTV TV network transmission, Internet transmission, satellite transmission, etc. Among them, the effective propagation distance of the signal sent by the transmission tower broadcast method is limited. It is the earliest generation of TV signal transmission method, and the actual user usage is very small at present; cable TV network transmission mainly solves the transmission of TV signals within the metropolitan area. Generally, cable TV network companies transmit programs to end users, and rarely carry cross-metropolitan transmission; IPTV TV network transmission is similar to cable TV network transmission, which mainly solves the transmission of programs to end users within the metropolitan area; Internet transmission is a new technology that has emerged in recent years. It can flexibly adapt to the needs of different users and transmit personalized programs to each end user separately, but the network bandwidth and cost required for large-scale transmission are extremely large. The above transmission methods are not suitable for the transmission of 8K ultra-high-definition video content. Therefore, it is urgent to find a more convenient and efficient transmission method. Satellite transmission has become an optional technical approach.

[0004] Usually, reports of major news events or sports events are reported using live reports or a combination of live reports and studios. So, how to transmit the video images of live reports to the studio, process them through the TV station's internal broadcast control system, add station logos and subtitles, and broadcast them to the public after safe broadcast control is an urgent problem that needs to be solved. After entering the ultra-high-definition era, especially with the application and development of 8k video, professional and technical personnel in this field have been exploring various ultra-high-speed transmission methods, transmission systems and transmission links. Currently, 4G wireless communication transmission, microwave transmission, and Internet transmission are widely used. However, the security, reliability and bandwidth of these transmission methods are very problematic, making it difficult to actually transmit 8k ultra-high-definition video programs. Satellite transmission systems have become an optional technical approach. However, there is no relatively mature and complete technical solution and system connection mode.

[0005] Although the transmission system and video receiving system of 8K ultra-high-definition video signals are basically source coding, channel modulation, power enhancement and transmission, and signal demodulation and decoding after forwarding through satellites, there is only successful experience in transmitting 4K ultra-high-definition video via satellites in the world. At present, there is no public technical composition of commercial 8K ultra-high-definition video satellite transmission systems, and the corresponding technical standards are also missing. There is no public equipment composition and connection method for 8K ultra-high-definition video satellite transmission and video receiving systems. Although 8K ultra-high-definition video can be transmitted through the Internet, the bandwidth and real-time requirements of the transmission network are very high. At the same time, if a program needs to be distributed to many users, the cost of bandwidth and traffic will be very high, which largely restricts the further widespread application of 8K ultra-high-definition video services.

[0006] Due to the relatively immature development of 8K technology, many 8K video-related sampling equipment, encoding equipment, modulation equipment, decoding equipment and other technical standards are not unified, the output interfaces are different, and it is difficult for equipment to interconnect. The equipment composition, signal conversion method, interface method, interface protocol, and system-suitable bit rate of the complete 8K video satellite transmission system are not clear, and it is difficult for the industry to use satellite transmission to transmit 8K ultra-high-definition video. At the same time, the ultra-high-definition broadcast vehicles, ultra-high-definition cameras, and ultra-high-definition switcher systems that produce ultra-high-definition videos also have various internal working principles, system connection methods, system external output interface forms, and output content composition forms. In this case, accurate identification and clear definition of the output interfaces and output content composition forms of various ultra-high-definition signal sources are very important for the subsequent encoding and transmission links.

[0007] There is no technical solution to the above technical problems in the prior art. Summary of the invention

[0008] The purpose of the present invention is to provide a video broadcasting system and a video receiving system, so as to provide a complete set of practical ultra-high-definition video broadcasting system and video receiving system, which can be used in conjunction with a relatively mature satellite forwarding system to achieve efficient transmission of ultra-high-definition video through satellite broadcasting / live broadcasting.

[0009] In the first aspect, an embodiment of the present invention provides a video broadcasting system, which includes an encoding device, a signal frequency conversion modulation device, a signal power amplifying device and a satellite transmitting antenna; the video signal source is connected to the encoding device via an SDI cable or an optical fiber; the encoding device is connected to the signal frequency conversion modulation device; the signal frequency conversion modulation device is connected to the signal power amplifying device via a radio frequency cable; the signal power amplifying device is connected to the satellite transmitting antenna via a waveguide device; the encoding device receives an ultra-high-definition video signal provided by the video signal source via an SDI cable or an optical fiber, encodes the ultra-high-definition video signal to obtain an ultra-high-definition video TS stream signal, and sends the ultra-high-definition video TS stream signal to the signal frequency conversion modulation device; the signal frequency conversion modulation device is used to modulate and frequency convert the received ultra-high-definition video TS stream signal to obtain a processed TS stream signal; the signal power amplifying device is used to power amplify the processed TS stream signal to obtain a power amplified signal; the waveguide device is used to transmit the power amplified signal to the satellite transmitting antenna, so that the satellite transmitting antenna transmits the power amplified signal to the satellite for forwarding by the repeater on the satellite.

[0010] Furthermore, the above-mentioned video signal sources include: ultra-high-definition cameras, ultra-high-definition broadcast vehicles, ultra-high-definition switchers or ultra-high-definition players; ultra-high-definition cameras, ultra-high-definition broadcast vehicles, ultra-high-definition switchers and ultra-high-definition players are all used to provide ultra-high-definition video signals.

[0011] Furthermore, the connection method between the above-mentioned encoding device and the video signal source includes any one of the following: connection through 1 48G SDI interface cable; connection through 4 12G SDI interface cables; connection through 1 optical fiber.

[0012] Furthermore, the above-mentioned encoding device is also used to: sample and process 8K ultra-high-definition video signals; compress and encode the sampled 8K ultra-high-definition video signals, and the 8K ultra-high-definition video TS stream signal generated after encoding is a single-channel 8K video signal or an 8K ultra-high-definition video TS stream signal composed of 4-channel 4K ultra-high-definition video TS stream signals.

[0013] Furthermore, the compression encoding format of the 8k ultra-high-definition video TS stream signal output by the above-mentioned encoding device adopts H.265, and the compression encoding code rate is 15 to 300Mbps.

[0014] Furthermore, the above encoding device includes a signal receiving device, a signal sampling device, a signal encoding device and a code stream output device which are connected in sequence.

[0015] Furthermore, the signal sampling device is used to encode and sample one channel of 8K ultra-high-definition video into four channels of 4K ultra-high-definition video using a 2SI method or an SQD method.

[0016] Furthermore, the above-mentioned encoding device also includes a code stream multiplexing device; the code stream multiplexing device is connected to the signal encoding device and the code stream output device respectively; the code stream multiplexing device is used to: multiplex 4 channels of 4K ultra-high-definition video TS stream signals into 1 channel of TS stream signal.

[0017] Furthermore, the encoding device and the signal frequency conversion modulation device are connected via an ASI interface cable or an IP network cable.

[0018] In the second aspect, an embodiment of the present invention provides a video receiving system, which includes a satellite receiving antenna, a radio frequency signal power amplifying device, a radio frequency signal frequency conversion demodulation device, and a signal decoding output device connected in sequence; the satellite receiving antenna is used to receive a designated signal forwarded by a satellite transponder, and send the designated signal to the radio frequency signal power amplifying device; the radio frequency signal power amplifying device is used to power amplify the designated signal; the radio frequency signal frequency conversion demodulation device is used to demodulate the designated signal after power amplification; the signal decoding output device is used to decode the demodulated signal, and output the decoded signal to an external device.

[0019] Furthermore, the above-mentioned signal decoding output device includes an output interface; the output interface includes any one or more of the following interfaces: 8K SDI interface, 4-channel 4K SDI interface, HDMI2.1 interface, 4-channel HDMI2.0 interface, and optical fiber interface.

[0020] Furthermore, the signal output form of the above-mentioned signal decoding and output device includes any one or more of the following: 1 single-channel 8K SDI video signal; 1 single-channel 8K video signal in HDMI2.1 format; 4-channel 4K SDI video signal in 2SI mode; 4-channel 4K SDI video signal in SQD mode; 4-channel 4K 2SI video signal in HDMI 2.0 format; 4-channel 4K HDMI 2.0 video signal in SQD mode.

[0021] Furthermore, the above-mentioned external devices include one or more of the following devices: 8K hard disk recorder, 8K recorder, 8K video encoder, 8K laser projection equipment, 8K TV, 8K monitor, 8K large-screen equipment, 8KLED large screen, 8KMini LED large screen, 4K TV, 4K monitor, 4K / 8K oscilloscope, 4K / 8K signal analyzer.

[0022] The embodiments of the present invention bring the following beneficial effects:

[0023] The embodiment of the present invention provides a video relay system and a video receiving system, in which the encoding device in the video relay system encodes the ultra-high-definition video signal provided by the received video signal source to obtain an ultra-high-definition video TS stream signal, and sends the ultra-high-definition video TS stream signal to the signal frequency conversion modulation device; the signal frequency conversion modulation device modulates and frequency converts the received ultra-high-definition video TS stream signal to obtain a processed TS stream signal; the signal power amplification device is used to power amplify the processed TS stream signal to obtain a power amplified signal; the waveguide device transmits the power amplified signal to the satellite transmitting antenna, so that the satellite transmitting antenna transmits the power amplified signal to the satellite, and forwards it to the ground through the satellite transponder. After receiving the signal forwarded by the satellite, the ground video receiving system performs frequency conversion power amplification and demodulation, demultiplexing, and decoding on the forwarded signal, and recovers the ultra-high-definition video signal for playback or recording. The present invention improves the transmission efficiency of 8K ultra-high-definition video signals, facilitates the simultaneous transmission of ultra-high-definition video programs to multiple locations and multiple addresses, reduces the cost of promoting and applying ultra-high-definition video, and has important practical application value.

[0024] The present invention solves the problem that there is a lack of interconnection standards when processing ultra-high-definition program transmission between satellite video relay and satellite video receiving systems, and the equipment used in the system cannot be interconnected. It solves the huge traffic cost problem when transmitting 8K ultra-high-definition video in traditional network mode, and has outstanding technical advantages when performing 8K ultra-high-definition video live broadcast, relay or distribution of 8K ultra-high-definition video to multiple target receiving locations. Through a large number of preliminary technical experiments, the present invention determines the correspondence between the 8K ultra-high-definition video encoding bit rate and the satellite transmission channel, and gives the range of 8K ultra-high-definition video encoding bit rate control, determines the composition of the satellite relay / live broadcast system components, the signal connection method between the system, the interface method and the control connection relationship between the equipment, and removes the technical barriers for the widespread application of 8K ultra-high-definition video transmission via satellite.

[0025] Other features and advantages of the present invention will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present invention.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically listed below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a video broadcasting system provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of an encoding device provided by an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of image signal segmentation / sampling using the SQD method provided by an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of image signal segmentation / sampling using a 2SI method provided in an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the structure of a video receiving system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Taking into account the problem of low transmission efficiency of ultra-high-definition video signals in the prior art, an embodiment of the present invention provides a video broadcasting system and a video receiving system. This technology can be applied to application scenarios such as satellite video broadcasting, video playback, satellite live broadcasting, live broadcasting, and ultra-high-definition video content transmission via satellite.

[0036] In order to facilitate understanding of this embodiment, a video broadcasting system disclosed in an embodiment of the present invention is first described in detail; Figure 1 As shown, the system includes an encoding device 10, a signal frequency conversion modulation device 11, a signal power amplifying device 12 and a satellite transmitting antenna 13; the video signal source is connected to the encoding device 10 via an SDI (serial digital interface) cable or an optical fiber; the encoding device 10 is connected to the signal frequency conversion modulation device 11; the signal frequency conversion modulation device 11 is connected to the signal power amplifying device 12 via a radio frequency cable; the signal power amplifying device 12 is connected to the satellite transmitting antenna 13 via a waveguide device.

[0037] The encoding device 10 receives the ultra-high-definition video signal provided by the video signal source through an SDI cable or optical fiber, encodes the ultra-high-definition video signal to obtain an ultra-high-definition video TS stream signal, and sends the ultra-high-definition video TS (Transport Stream) stream signal to the signal frequency conversion modulation device.

[0038] The signal frequency conversion modulation device 11 is used to perform modulation and frequency conversion processing on the received ultra-high-definition video TS stream signal to obtain a processed TS stream signal.

[0039] The signal power amplifier device 12 is used to power amplify the processed TS stream signal to obtain a power amplified signal; the waveguide device is used to transmit the power amplified signal to the satellite transmitting antenna 13, so that the satellite transmitting antenna 13 transmits the power amplified signal to the satellite for forwarding by the repeater on the satellite.

[0040] The above-mentioned ultra-high-definition video signal is the video content that needs to be transmitted to the remote user, and can also be called a program signal. The above-mentioned encoding device 10 can encode the ultra-high-definition video signal and perform necessary multiplexing processing according to pre-set parameters; when encoding, it is usually necessary to receive the ultra-high-definition video signal transmitted by the signal source. Therefore, the encoding device can sample the real-time ultra-high-definition video signal and compress and encode the sampled data. Common compression encoding formats include MPEG2, JPEG2000, H.264, H.265, etc. After compression encoding, the encoding device generates an 8K ultra-high-definition video TS stream signal for real-time output.

[0041] In order to transmit the ultra-high-definition video signal to the satellite transponder, the above-mentioned signal frequency conversion modulation device 11 usually needs to modulate the content of the ultra-high-definition video signal to a specific frequency band according to a certain format and modulation method. That is, the signal frequency conversion modulation device 11 can receive the encoded ultra-high-definition video signal, and process the signal to adapt to the satellite transmission channel, and output the processed signal to the satellite radio frequency channel, which can also be called a satellite channel adapter. The satellite channel adapter processes the received signal mainly in accordance with the two major standards of DVB-S and DVB-S2. DVB-S2 is a new generation of satellite channel transmission standard, which adopts channel coding with stronger error correction capability and modulation method with higher transmission efficiency.

[0042] The signal processed by the signal frequency conversion modulation device 11 is actually a radio frequency signal. In order to transmit to the satellite, the energy attenuation problem in the satellite transmission must be solved, so the radio frequency signal needs to be power amplified, that is, the signal power amplification device 12 is used to amplify the modulated TS stream signal.

[0043] The waveguide device is responsible for connecting the signal power amplifying device 12 and the satellite transmitting antenna 13, providing a channel with very little attenuation for the radio frequency signal, and transmitting the amplified ultra-high-definition video TS stream signal (equivalent to the above-mentioned power amplified signal or the power-amplified radio frequency signal) to the satellite transmitting antenna; the satellite transmitting antenna is responsible for transmitting the amplified ultra-high-definition video TS stream signal to the satellite for forwarding by the transponder on the satellite. The satellite transmitting antenna needs to accurately transmit the beam to the satellite, and the satellite transmitting antenna can usually operate in the C band, Ku band or Ka band. Since the C band has excellent anti-rain attenuation performance, satellite relay mostly uses C-band radio frequency signals for uplink and downlink forwarding. This embodiment also preferably uses the C band for signal forwarding.

[0044] In actual work, after the satellite receiver receives the signal transmitted by the antenna uplink, it also needs to perform necessary frequency conversion and power amplification on the signal, and then forward it to the predetermined area through the transponder. Usually, there are multiple transponders with multiple bands on a satellite, and the uplink frequency and downlink frequency of each transponder are different. The signal frequency modulation device is responsible for modulating the video signal to the predetermined uplink frequency band of the satellite transponder. Similarly, in the receiving system, the operating frequency of the RF receiving device of the satellite signal receiving system needs to be set to the downlink frequency band of the predetermined transponder in order to correctly receive and restore the video content.

[0045] In specific implementation, the above-mentioned video signal source includes an ultra-high-definition camera, an ultra-high-definition broadcast vehicle, an ultra-high-definition switcher or an ultra-high-definition player; the ultra-high-definition camera, the ultra-high-definition broadcast vehicle, the ultra-high-definition switcher and the ultra-high-definition player are all used to provide ultra-high-definition video signals. That is, the video signal source can be an ultra-high-definition camera, which obtains real-time ultra-high-definition video signals by shooting relevant content; it can be an ultra-high-definition player, which plays pre-produced ultra-high-definition video content; it can be an ultra-high-definition broadcast vehicle, which can collect a large number of ultra-high-definition video signals, edit and process these video signals, switch, convert the format, add subtitle information, etc., and then output ultra-high-definition video program signals; it can also be an ultra-high-definition switcher, which provides switching, special effects and other production processing for two or more ultra-high-definition videos, and outputs the produced ultra-high-definition video signals at the same time. The above-mentioned ultra-high-definition video signal can be an 8K ultra-high-definition video signal, or a higher-resolution ultra-high-definition video signal.

[0046] Usually, cameras and players provide multiple interfaces to output video signals. However, due to the extremely large amount of data in 8K ultra-high-definition signals, it is difficult to transmit with an ordinary 1-channel signal transmission interface. For this reason, this embodiment proposes a solution to output 1-channel 8K signals through 4-channel 4K SDI interfaces. At this time, the connection method between the encoding device and the video signal source is through 4-channel 12G SDI interface cables. In this case, the processing board / processing card / chip / logic circuit that processes the 4-channel 4k video signals inside the encoding device 10 needs to be strictly synchronized. With the advancement of technology, the transmission performance of the SDI interface will also be improved. When the SDI cable and interface can safely and reliably realize 48G signal transmission, the video signal source and the encoding device 10 can also be connected through a 1-channel 48G SDI interface cable. At the same time, a 1-channel optical fiber connection is also a feasible method, which requires the video signal source and the encoding device 10 to support the same optical transmission signal protocol at the same time.

[0047] The encoding device is also used to sample and process 8K ultra-high-definition video signals; compress and encode the sampled 8K ultra-high-definition video signals, and the 8K ultra-high-definition video TS stream signal generated after encoding is a single-channel 8K video signal or an 8K ultra-high-definition video TS stream signal composed of four 4K ultra-high-definition video TS stream signals. The compression encoding format of the 8k ultra-high-definition video TS stream signal output by the encoding device can adopt H.265, and the compression encoding code rate can be 15 to 300Mbps.

[0048] In actual situations, the satellite transmission bit rate of 8K ultra-high-definition video signals is usually selected between 60Mbps and 180Mbps. The selection of the bit rate mainly refers to the requirements for the decoding and broadcasting quality of the receiving and receiving ends, the channel transmission cost, the channel coding format, the satellite transmission channel modulation method, the satellite transponder bandwidth, etc. The encoding bit rate is designed according to the maximum bandwidth carrying capacity under certain economic conditions. At the same time, in order to ensure that the system can carry the correct transmission of the changing bit rate when the encoding output bit rate is unstable due to factors such as violent lens movement and changes in picture complexity, the encoding bit rate should usually be slightly lower than the system bit rate that the satellite channel can carry, and the system bit rate can leave a margin of 2 to 5Mbps.

[0049] The encoding device 10 may include a signal receiving device, a signal sampling device, a signal encoding device, and a code stream output device which are connected in sequence.

[0050] In some embodiments, the encoding device 10 further comprises a stream multiplexing device, such as Figure 2 The schematic diagram of the structure of an encoding device is shown; the code stream multiplexing device is connected to the signal encoding device and the code stream output device respectively. That is, when the 8K ultra-high-definition video TS stream signal generated by the encoding device 10 after encoding is an 8K ultra-high-definition video TS stream signal composed of 4 channels of 4K ultra-high-definition video TS stream signals, the 4 channels of 4K ultra-high-definition video TS stream signals are multiplexed into 1 channel of TS stream signal through the multiplexing device inside the encoding device.

[0051] In actual applications, no matter whether the encoding device 10 receives an 8K ultra-high-definition video signal through one SDI cable or receives an 8K ultra-high-definition video signal through four 12G SDI interface cables, the encoding device can completely restore each 8K frame of the 8K ultra-high-definition video through the signal receiving device internally. At the same time, the signal sampling device inside the encoding device can also sample the four channels of 4K SDI videos separately, or sample one frame of 8k into four sub-pictures, each sub-picture being a 4K frame; or it can restore the four channels of 4K SDI videos to each frame of 8K, and then resample the pictures into four channels of 4K content with different sampling formats.

[0052] The encoding device 10 can encode and sample one channel of 8K ultra high-definition video into four channels of 4K ultra high-definition video signals, or resample four channels of 4K ultra high-definition video signals into four channels of 4K ultra high-definition video signals of different sampling formats. The sampling methods of the four channels of 4K ultra high-definition video signals and their corresponding recombination methods are: 2SI (2sample interleave) method or SQD (Square Division) method. The four channels of 4K video signals include: four channels of 4K video signals collected by a four-channel 2SI method, or four channels of 4K video signals collected by a four-channel SQD method.

[0053] A brief description of the two acquisition methods, 2SI and SQD, is as follows: SQD in the early stage and 2SI in the later stage. Figure 3 The figure shows a schematic diagram of image signal segmentation using the SQD method. The SQD method segments an 8K image into four independent squares, each of which is a part of the entire 8K image. The content of each square is encoded into a 4K video signal (such as Figure 3 ); when restoring the 8K images at the receiving end for splicing, just restore them according to the original positions of the images. Figure 4 The figure shows a schematic diagram of image signal segmentation using the 2SI method. The 2SI sampling method allocates two adjacent points to different 4K signals, so that the content of each 4K image is exactly the same as the 8K image, and the only difference is the resolution. In this way, when the receiving end restores the 8K image, one 4K signal temporarily loses frames, which will only cause the brightness of the restored 8K image to decrease, and will not affect the audience's understanding and viewing of the video content.

[0054] In practical applications, the video signal source outputs 1 channel 8K ultra-high-definition video through 4-channel 4K SDI cables, which is a very economical and effective way in engineering technology. Since the current 8k video technology is very cutting-edge, the 48GSDI cable and interface equipment that directly output 8k video signals are not yet mature, and the price is also very expensive. The optical fiber interface protocol that directly outputs 8k video signals is not very mature, and the application range is not wide, and it is difficult for devices to interconnect. At the same time, the SDI interface technology of 12G 4k is mature and widely used, and the interconnection of devices using this interface is relatively convenient. At the same time, if the encoding device encodes 4-channel 4K video, it can be directly integrated using existing equipment / boards / chips, which is low in cost and technically safe and reliable. For this reason, the present invention preferably uses 4-channel 4K SDI cables to connect the video signal source and the encoding device.

[0055] Specifically, if the ultra-high-definition video signal is a 1-channel 8K video signal, a preset signal encoding module can be used to encode the ultra-high-definition video signal into a 1-channel 8K ultra-high-definition video TS stream signal, or it can be resampled and encoded into 4-channel 4K ultra-high-definition video TS stream signals; if the ultra-high-definition video signal is an 8K video signal composed of 4-channel 4K video signals, a preset signal encoding module is used to encode each 4K video signal separately, encode it into 4-channel 4K ultra-high-definition video TS stream signals, and the 4-channel 4K ultra-high-definition video TS stream signals are multiplexed into 1 TS stream to generate 1-channel 8K ultra-high-definition video TS stream signal.

[0056] Regarding the choice of 2SI and SQD image acquisition methods and receiver recovery methods, each method has its own advantages. The 2SI sampling method allocates two adjacent points to different 4K signals, so that the content of each 4K picture is exactly the same as the 8K picture, and the only difference is the resolution. In this way, when the receiving end restores the 8K picture, if one 4K signal temporarily loses a frame, it will only cause the brightness of the restored 8K picture to decrease, and will not affect the audience's understanding and viewing of the video content. However, since the current video compression coding is lossy compression, the correlation of any adjacent pixels in each sub-picture of the picture segmented by the SQD method is greater than that of the picture segmented by the 2SI method, which is conducive to improving compression efficiency. Under the same encoding bit rate, the picture quality restored after decoding the picture segmented by the SQD method is better than the picture restored after segmentation and decoding by the 2SI method. The present invention preferably recommends using the SQD method to segment and sample 8K video.

[0057] In summary, based on the consideration of easy engineering implementation and the economic efficiency of the solution, the preferred embodiment of the present invention uses 4-channel 4K SDI cables to connect the video signal source and the encoding device, and uses the SQD method to segment and sample the 8K video.

[0058] In fact, no matter how the video signal source is transmitted to the encoding device, the encoding device can resample the 8k video through the cooperation of its internal signal receiving device and signal sampling device, and perform sampling and compression encoding in the most appropriate screen segmentation method. The following factors are mainly considered for the appropriate screen segmentation method: satellite transmission channel bit error rate, encoding format supported by existing encoding equipment. If the satellite transmission channel bit error rate is very small, the SQD method can be used to sample 4 channels of 4k video and encode them separately; if the satellite transmission channel bit error rate is very small, there is a mature 8K encoder, which can be directly encoded into 1 channel 8K ultra-high-definition video TS stream signal, with high compression efficiency, fewer technical links, high reliability, and simple implementation; if the satellite transmission channel bit error rate is high, it can be sampled into 4 channels of 4K video signals through the 4-channel 2SI method and encoded into 4 channels of 4K video TS signals. When using the 2SI method to capture one 8K ultra-high-definition video signal into four 4K video signals, each 4K video signal contains complete 8K picture content. At the receiving end, if a certain 4K signal is not received normally, the final restored picture is still complete, which is beneficial to the reliability of signal transmission and improves the viewing satisfaction of the receiving end.

[0059] Furthermore, the encoding device 10 is connected to the signal frequency conversion modulation device 11 by an ASI (Asynchronous Serial Interface) interface cable or an IP (Internet Protocol) network cable. In a specific implementation, when connected via an ASI interface, the signal format output by the encoding device is TS stream Over ASI, and when connected via an IP network, the output signal format is TS stream Over IP.

[0060] The above-mentioned video broadcasting system improves the transmission efficiency of 8K ultra-high-definition video signals, facilitates the simultaneous transmission of ultra-high-definition video programs to multiple locations and multiple addresses, reduces the cost of promoting and applying ultra-high-definition video, and has important practical application value.

[0061] The embodiment of the present invention also provides a video receiving system, such as Figure 5 As shown, the video receiving system includes a satellite receiving antenna 50, a radio frequency signal power amplifying device 51, a radio frequency signal frequency conversion demodulating device 52 and a signal decoding output device 53 which are connected in sequence.

[0062] The satellite receiving antenna 50 is used to receive the designated signal forwarded by the satellite's transponder and send the designated signal to the RF signal power amplifier device 51; the RF signal power amplifier device 51 is used to amplify the power of the designated signal; the RF signal frequency conversion demodulation device 52 is used to demodulate the designated signal after power amplification; the signal decoding output device 53 is used to decode the demodulated signal and output the decoded signal to an external device.

[0063] In actual operation, the satellite receiving antenna 50 can receive weak signals forwarded by the satellite transponder and remove noise as much as possible. The designated signal sent by the satellite transponder reaches the ground and is received by the antenna surface, reflected and focused to the receiving port of the feed source and the high-frequency head, and the low-frequency head amplifies and converts the weak satellite forwarding signal, which is output by the LNB (Low Noise Block, high-frequency head) and sent to the satellite receiver through the radio frequency cable; the satellite receiver demodulates the satellite signal sent by the high-frequency head, and outputs the video image signal and the accompanying sound signal after decoding.

[0064] Furthermore, the signal decoding output device 53 includes an output interface; the output interface includes any one or more of the following interfaces: 8K SDI interface, 4-channel 4K SDI interface, HDMI2.1 interface, 4-channel HDMI2.0 interface, and optical fiber interface.

[0065] The signal output form of the above-mentioned signal decoding output device 53 includes any one or more of the following: 1 single-channel 8K SDI video signal; 1 single-channel 8K HDMI2.1 format video signal; 4-channel 4K SDI video signal in 2SI mode; 4-channel 4K SDI video signal in SQD mode; 4-channel 4K 2SI mode HDMI 2.0 format video signal; 4-channel SQD mode 4K HDMI 2.0 format video signal.

[0066] The selection of the output interface of the specific signal decoding output device 53 is usually determined by referring to the interface format of the subsequent audio and video playback device or recording device. At present, some 8K TVs have 4 HDMI 2.0 format interfaces, some 8K TVs have 1 HDMI 2.1 format (capable of transmitting 8K ultra-high-definition video signals) interface, and some monitors have 4 4K SDI video signal interfaces. Select the output interface of the signal decoding output device according to the interface mode of the device being used. Of course, you can also select a video playback or recording device with a corresponding interface according to the output interface mode of the signal decoding output device (when there are restrictions).

[0067] Furthermore, the above-mentioned external devices include one or more of the following devices: 8K hard disk recorder, 8K recorder, 8K video encoder, 8K laser projection equipment, 8K TV, 8K monitor, 8K large-screen equipment, 8KLED large screen, 8KMini LED large screen, 4K TV, 4K monitor, 4K / 8K oscilloscope, 4K / 8K signal analyzer.

[0068] It should also be noted that technicians in this industry are well aware that ultra-high-definition video signals or ultra-high-definition program signals not only contain video content, but also audio content or accompanying sound content. Therefore, the video signals, ultra-high-definition video signals, etc. mentioned in the present invention can actually be understood as ultra-high-definition video signals that carry both video information and audio information.

[0069] It should also be added that, although the present invention and its embodiments use 8K ultra-high-definition video in many cases when describing the technical content of the present invention, it is easy for those skilled in the art to understand that replacing 8K ultra-high-definition video with ultra-high-definition video of other resolutions such as 10K, 12K or 16K can be achieved on the basis of the present invention without any creative work. Therefore, 8K ultra-high-definition video is not a technical limitation of the present invention, but is only an example for the convenience of users' understanding.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A video broadcasting system, It is characterized in that The system includes a coding device, a signal frequency conversion modulation device, a signal power amplification device and a satellite transmitting antenna; The video signal source is connected to the encoding device via an SDI cable or an optical fiber; the encoding device is connected to the signal frequency conversion modulation device; the signal frequency conversion modulation device is connected to the signal power amplification device via a radio frequency cable; the signal power amplification device is connected to the satellite transmitting antenna via a waveguide device; The encoding device receives the ultra-high-definition video signal provided by the video signal source through the SDI cable or the optical fiber, encodes the ultra-high-definition video signal to obtain an ultra-high-definition video TS stream signal, and sends the ultra-high-definition video TS stream signal to the signal frequency conversion modulation device; The signal frequency conversion modulation device is used to modulate and frequency convert the received ultra-high-definition video TS stream signal to obtain a processed TS stream signal; the signal power amplification device is used to power amplify the processed TS stream signal to obtain a power amplified signal; The waveguide device is used to transmit the power amplified signal to the satellite transmitting antenna, so that the satellite transmitting antenna transmits the power amplified signal to the satellite for forwarding by the transponder on the satellite; The ultra-high-definition video signal is an 8K ultra-high-definition video signal; The encoding device includes a signal receiving device, a signal sampling device, a signal encoding device and a code stream output device connected in sequence; the signal sampling device in the encoding device is used to encode and sample one channel of 8K ultra-high-definition video into four channels of 4K ultra-high-definition video using a 2SI method or an SQD method, so as to reduce the amount of signal data required to be transmitted by the signal transmission interface; The encoding device performs the encoding process of 4-channel 4K video signals synchronously; The encoding device also includes a code stream multiplexing device; the code stream multiplexing device is connected to the signal encoding device and the code stream output device respectively; the code stream multiplexing device is used to: multiplex 4K ultra-high-definition video TS stream signals into 1 TS stream signal.

2. The system according to claim 1, It is characterized in that The video signal source includes: an ultra-high-definition camera, an ultra-high-definition broadcast vehicle, an ultra-high-definition switcher or an ultra-high-definition player; The ultra-high-definition camera, the ultra-high-definition broadcast vehicle, the ultra-high-definition switcher and the ultra-high-definition player are all used to provide the ultra-high-definition video signal.

3. The system according to claim 1, It is characterized in that The connection mode between the encoding device and the video signal source includes any one of the following: Connected via 1-channel 48G SDI interface cable; Connected via 4-channel 12G SDI interface cables; Connected via 1 fiber optic cable.

4. The system according to claim 3, It is characterized in that The encoding device is also used for: Sampling and processing the 8K ultra-high-definition video signal; The sampled 8K ultra-high-definition video signal is compressed and encoded, and the 8K ultra-high-definition video TS stream signal generated after encoding is a single-channel 8K video signal or an 8K ultra-high-definition video TS stream signal composed of 4-channel 4K ultra-high-definition video TS stream signals.

5. The system according to claim 4, It is characterized in that The compression encoding format of the 8k ultra-high-definition video TS stream signal output by the encoding device adopts H.265, and the compression encoding code rate is 15 to 300Mbps.

6. The system according to claim 1, It is characterized in that The encoding device is connected to the signal frequency conversion modulation device by: connecting through an ASI interface cable or connecting through an IP network cable.

7. A video receiving system, It is characterized in that Used for processing the signal transmitted by the video broadcasting system according to any one of claims 1 to 6, the video receiving system comprises a satellite receiving antenna, a radio frequency signal power amplification device, a radio frequency signal frequency conversion demodulation device, and a signal decoding output device connected in sequence; The satellite receiving antenna is used to receive a designated signal forwarded by a satellite transponder, and send the designated signal to the radio frequency signal power amplification device; The radio frequency signal power amplification device is used to amplify the power of the designated signal; The radio frequency signal frequency conversion and demodulation device is used to demodulate the designated signal after power amplification; The signal decoding and output device is used to decode the demodulated signal and output the decoded signal to an external device.

8. The video receiving system according to claim 7, It is characterized in that The signal decoding output device includes an output interface; the output interface includes any one or more of the following interfaces: 8K SDI interface, 4-channel 4K SDI interface, HDMI2.1 interface, 4-channel HDMI2.0 interface, and optical fiber interface.

9. The video receiving system according to claim 8, It is characterized in that The signal output form of the signal decoding and output device includes any one or more of the following: 1-channel 8K SDI video signal; 1-channel 8K HDMI2.1 video signal; 4-channel 4K 2SI SDI video signal; 4-channel SQD 4K SDI video signal; 4-channel 2SI 4K HDMI 2.0 format video signal; 4-channel SQD 4K HDMI 2.0 format video signal.

10. The video receiving system according to claim 7, It is characterized in that The external device includes one or more of the following devices: 8K hard disk recorder, 8K recorder, 8K video encoder, 8K laser projection equipment, 8K TV, 8K monitor, 8K large screen equipment, 8KLED large screen, 8K Mini LED large screen, 4K TV, 4K monitor, 4K / 8K oscilloscope, 4K / 8K signal analyzer.

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