CN111726700A - Video relay system and video receiving system - Google Patents
Video relay system and video receiving system Download PDFInfo
- Publication number
- CN111726700A CN111726700A CN202010526221.8A CN202010526221A CN111726700A CN 111726700 A CN111726700 A CN 111726700A CN 202010526221 A CN202010526221 A CN 202010526221A CN 111726700 A CN111726700 A CN 111726700A
- Authority
- CN
- China
- Prior art keywords
- signal
- video
- ultra
- satellite
- high definition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
- H04N21/6193—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via a satellite
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
Abstract
The invention provides a video rebroadcasting system and a video receiving system, wherein coding equipment in the video rebroadcasting system codes received ultra-high definition video signals to obtain ultra-high definition video TS (transport stream) signals and sends the ultra-high definition video TS signals to signal frequency conversion modulation equipment; the signal frequency conversion modulation equipment modulates and frequency-converts the received ultra-high definition video TS stream signal to obtain a processed TS stream signal; the signal power amplification equipment is used for carrying out power amplification on the processed TS flow signal to obtain a power amplification 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 being forwarded by a transponder on the satellite. After receiving the signals transmitted by the satellite, the ground performs frequency conversion power amplification and demodulation and decoding to recover the ultra-high definition video signals for playing or recording. The invention improves the transmission efficiency of the 8K ultra-high definition video signal.
Description
Technical Field
The invention relates to the technical field of satellite rebroadcasting, in particular to a video rebroadcasting system and a video receiving system.
Background
The resolution of the ultra-high definition images is 3840 × 2160 and 7680 × 4320, also commonly known as 4K and 8K, as specified by ITU-R bt.2020 parameter values for ultra-high definition television system programming and international switching and GY/T307-2017 parameter values for ultra-high definition television system programming and switching. From the viewpoint of a television terminal, a television set capable of receiving, processing, and displaying an ultra high definition program is called an ultra high definition television. The resolution of the 4K ultra-high definition television screen is 3840 multiplied by 2160 pixels, the definition can reach 2160 television lines, the resolution of the 8K ultra-high definition television screen is 7680 multiplied by 4320 pixels, and the definition can reach 4320 television lines. According to the transmission of the ultra-high definition video, 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 according to the H.265 standard (350-1000 compression ratio). At present, some research applications of 10K ultrahigh-definition videos, 12K ultrahigh-definition videos and 16K ultrahigh-definition videos are carried out.
Due to the fact that the data volume of the 8K ultrahigh-definition video and the ultrahigh-definition video with the resolution rate of more than 8K is very large, the technical difficulty is very high for the transmission of the 8K ultrahigh-strength video, and the requirement on a transmission technical system is very high. At present, the main technical solutions for video transmission include: the system comprises an open broadcast television signal transmitting tower, a cable television network transmission, an IPTV television private network transmission, an internet transmission, a satellite transmission and the like. The transmission tower broadcast mode is limited in effective transmission distance of transmitted signals, is the transmission mode of the earliest generation of television signals, and is extremely small in use amount of the current practical users; cable television network transmission mainly solves the transmission of television signals in a metropolitan area, generally, a cable television network company transmits programs to terminal users for use, and the cross-metropolitan area transmission is rarely carried; the IPTV television private network transmission is similar to cable television network transmission, and mainly solves the problem of program transmission to terminal users in a metropolitan area; internet transmission is a technology which is newly developed in recent years, can flexibly adapt to the requirements of different users, and transmits personalized programs for each terminal user respectively, but the network bandwidth and the cost required during large-scale transmission are extremely large. The transmission mode has incompatible factors in the aspect of transmitting 8K ultra-high-definition video contents, so that a more convenient and efficient transmission mode is urgently needed to be found, and satellite transmission becomes an optional technical approach.
Typically, the reporting of a major news event, or the reporting of a sporting event, is performed using a live report, or a combination of a live report and a studio. Then, how to transmit the video image reported on site to the studio, process by the broadcasting control system in the television station, add station caption and subtitle, and broadcast to the public after safe broadcasting control is the problem that needs to be solved urgently. After the ultra-high definition era, especially along with the application and development of 8k video, those skilled in the art are always exploring various ultra-high speed transmission modes, transmission systems and transmission links. At present, 4G wireless communication transmission, microwave transmission and internet transmission are widely applied. However, the security reliability and bandwidth of these transmission methods have great problems, it is difficult to actually transmit 8k ultra high definition video programs, and the satellite transmission system becomes an alternative technical approach. However, there is no relatively mature complete solution and system connection model.
Although the transmission system and the video receiving system of the 8K ultra high definition video signal are also basically signal source coding, channel modulation, power enhancement and transmission, and perform signal demodulation and decoding after being forwarded by a satellite, only the successful experience of transmitting the 4K ultra high definition video by the satellite is internationally available, no commercial 8K ultra high definition video satellite transmission system is disclosed at present, the corresponding technical standard is also missing, and no equipment composition and connection mode of the 8K ultra high definition video satellite transmission and video receiving system is disclosed. Although transmission of 8K ultra high definition video can be realized through the internet, the requirements on bandwidth and real-time performance of a transmission network are very high, and meanwhile, if a program needs to be distributed to a plurality of users, the cost of bandwidth and flow is very high, which greatly restricts further wide application of 8K ultra high definition video service.
Due to the fact that 8K technology development is relatively immature, technical standards of a plurality of 8K video related sampling devices, encoding devices, modulation devices, decoding devices and the like are not uniform, output interfaces are different, interconnection and intercommunication between the devices are difficult, the device composition mode, the signal conversion mode, the interface protocol, the code rate suitable for use of the system and the like of the complete 8K video satellite transmission system are not clear, and the satellite transmission mode is difficult to be used in the industry for transmitting 8K ultra-high definition videos. Meanwhile, the ultra-high-definition rebroadcasting vehicle, the ultra-high-definition camera and the ultra-high-definition switching platform system for producing ultra-high-definition videos have various internal working principles, system connection modes, external output interface forms of the system and composition forms of output contents. Under the condition, accurate identification and clear definition of the output interface and output content composition form of various ultra-high definition signal sources are very important for the subsequent coding transmission link.
Aiming at the technical problems, no technical scheme for solving the technical problems exists in the prior art.
Disclosure of Invention
The invention aims to provide a video rebroadcasting system and a video receiving system, so as to provide a complete set of practical ultra-high-definition video rebroadcasting system and video receiving system, which are matched with a relatively mature satellite retransmission system for use, and can realize the efficient transmission of ultra-high-definition video in a satellite retransmission/live broadcast mode.
In a first aspect, an embodiment of the present invention provides a video relay system, where 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 with the coding equipment through an SDI cable or an optical fiber; the coding equipment is connected with the signal frequency conversion modulation equipment; the signal frequency conversion modulation equipment is connected with the signal power amplification equipment through a radio frequency cable; the signal power amplification device is connected with the satellite transmitting antenna through the waveguide device; the coding device receives the ultra-high definition video signal provided by the video signal source through the SDI cable or the optical fiber, codes the ultra-high definition video signal to obtain an ultra-high definition video TS (transport stream) signal, and sends the ultra-high definition video TS signal to the signal frequency conversion modulation device; the signal frequency conversion modulation equipment is used for modulating and carrying out frequency conversion processing on the received ultra-high definition video TS stream signals to obtain processed TS stream signals; the signal power amplification equipment is used for carrying out power amplification on the processed TS flow signal to obtain a power amplification signal; the waveguide device is used for transmitting the power amplification signal to the satellite transmitting antenna, so that the satellite transmitting antenna transmits the power amplification signal to the satellite for being forwarded by a transponder on the satellite.
Further, the video signal source includes: an ultra-high definition camera, an ultra-high definition rebroadcasting vehicle, an ultra-high definition switching platform or an ultra-high definition player; the ultra-high definition camera, the ultra-high definition rebroadcasting vehicle, the ultra-high definition switching platform and the ultra-high definition player are all used for providing ultra-high definition video signals.
Further, the connection mode of the coding device and the video signal source comprises any one of the following modes: the SDI interface cable is connected through a 1-path 48G SDI interface cable; the SDI interface cable is connected through a 4-path 12G SDI interface cable; through 1 optical fiber connection.
Further, the encoding device is further configured to: sampling 8K ultrahigh-definition video signals; and carrying out compression coding on the sampled 8K ultrahigh-definition video signals, wherein the 8K ultrahigh-definition video TS stream signals generated after coding are 1-path single-path 8K video signals or 8K ultrahigh-definition video TS stream signals formed by 4-path 4K ultrahigh-definition video TS stream signals.
Furthermore, the compression coding format of the 8k ultra-high definition video TS stream signal output by the coding device adopts H.265, and the code frequency of the compression coding is 15-300 Mbps.
Furthermore, the coding device comprises a signal receiving device, a signal sampling device, a signal coding device and a code stream output device which are connected in sequence.
Further, the signal sampling apparatus is configured to: and (3) adopting a 2SI mode or an SQD mode to code and sample 1 path of 8K ultrahigh-definition video into 4 paths of 4K ultrahigh-definition video.
Furthermore, the coding device further comprises a code stream multiplexing device; the code stream multiplexing device is respectively connected with the signal coding device and the code stream output device; the code stream multiplexing device is used for: and multiplexing 4 paths of 4K ultra-high-definition video TS signals into 1 path of TS signals.
Further, the connection mode between the coding device and the signal frequency conversion modulation device is as follows: connected by ASI interface cables or connected by IP network cables.
In a second aspect, an embodiment of the present invention provides a video receiving system, where the video receiving system includes a satellite receiving antenna, a radio frequency signal power amplifying device, a radio frequency signal frequency conversion demodulating device, and a signal decoding outputting device, which are connected in sequence; the satellite receiving antenna is used for receiving the specified signal forwarded by the transponder of the satellite and sending the specified signal to the radio-frequency signal power amplification equipment; the radio frequency signal power amplification equipment is used for carrying out power amplification on the specified signal; the radio frequency signal frequency conversion demodulation equipment is used for demodulating the specified signal after power amplification; the signal decoding output device is used for decoding the demodulated signal and outputting the signal after decoding processing to an external device.
Further, the signal decoding output device comprises an output interface; the output interface comprises any one or more of the following: an 8K SDI interface, a 4-path 4K SDI interface, an HDMI2.1 interface, a 4-path HDMI2.0 interface and an optical fiber interface.
Further, the signal output form of the signal decoding output device includes any one or more of the following: 1-channel single-channel 8K SDI video signal; 1 path of single 8K video signal in HDMI2.1 format; 4-channel 2SI 4K SDI video signals; 4K SDI video signals of 4 SQD modes; 4-channel 2SI 4K HDMI2.0 format video signal; 4-channel video signals of 4K HDMI2.0 format of SQD mode.
Further, the external device may include one or more of the following devices: the system comprises an 8K hard disk video recorder, an 8K video encoder, an 8K laser projection device, an 8K television, an 8K monitor, an 8K large screen device, an 8KLED large screen, an 8KMini LED large screen, a 4K television, a 4K monitor, a 4K/8K oscilloscope and a 4K/8K signal analyzer.
The embodiment of the invention has the following beneficial effects:
in the video relay system and the video receiving system provided by the embodiment of the invention, the coding device in the video relay system codes the received ultra-high definition video signal provided by the video signal source to obtain an ultra-high definition video TS (transport stream) signal, and sends the ultra-high definition video TS signal to the signal frequency conversion modulation device; the signal frequency conversion modulation equipment carries out modulation and frequency conversion processing on the received ultra-high definition video TS stream signal to obtain a processed TS stream signal; the signal power amplification equipment is used for carrying out power amplification on the processed TS flow signal to obtain a power amplification signal; the waveguide device transmits the power amplification signal to the satellite transmitting antenna, so that the satellite transmitting antenna transmits the power amplification signal to a satellite and forwards the power amplification signal to the ground through the satellite transponder. After receiving the signals transmitted by the satellite, the ground video receiving system performs frequency conversion power amplification, demodulation, demultiplexing and decoding on the transmitted signals, and recovers the ultra-high definition video signals to play or record. The invention improves the transmission efficiency of the 8K ultra-high-definition video signal, is convenient for simultaneously transmitting the ultra-high-definition video program to multiple places and multiple addresses, reduces the popularization and application cost of the ultra-high-definition video and has important practical application value.
The invention solves the problems that the existing satellite video rebroadcasting and satellite video receiving systems lack the standard of interconnection and intercommunication when processing ultra-high definition program transmission, and the equipment used in the systems cannot be interconnected and intercommunicated, solves the problem of huge flow cost when transmitting 8K ultra-high definition video in the traditional network mode, and has outstanding technical advantages when carrying out 8K ultra-high definition video live broadcast and rebroadcasting or distributing the 8K ultra-high definition video to a plurality of target receiving sites. According to the invention, through a large number of early-stage technical experiments, the corresponding relation between the code rate of the 8K ultra-high-definition video coding and a satellite transmission channel is determined, the control range of the code rate of the 8K ultra-high-definition video coding is given, the composition of the satellite rebroadcasting/direct broadcasting system component equipment is determined, and the signal connection mode, the interface mode and the control connection relation among the equipment among the systems sweep technical obstacles for the wide application of the 8K ultra-high-definition video transmission through the satellite.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention as set forth above.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a video relay system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an encoding apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of image signal segmentation/sampling by an SQD method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of image signal segmentation/sampling in a 2SI mode according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a video receiving system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In view of the problem of low transmission efficiency of ultra-high-definition video signals in the prior art, embodiments of the present invention provide a video relay system and a video receiving system, which can be applied to application scenarios such as satellite video relay, video playing, satellite live broadcast, live relay, and ultra-high-definition video content transmission via a satellite.
In order to facilitate understanding of the embodiment, a detailed description is first given of a video relay system disclosed in the embodiment of the present invention; as shown in fig. 1, the system includes an encoding device 10, a signal frequency conversion modulation device 11, a signal power amplification device 12 and a satellite transmitting antenna 13; the video signal source is connected to the encoding device 10 through an SDI (serial digital interface) cable or an optical fiber; the coding device 10 is connected with a signal frequency conversion modulation device 11; the signal frequency conversion modulation equipment 11 is connected with the signal power amplification equipment 12 through a radio frequency cable; the signal power amplification device 12 is connected to a satellite transmission antenna 13 via a waveguide device.
The encoding device 10 receives an ultra high definition video signal provided by a video signal source through 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 transmits the ultra high definition video TS (transport stream) stream signal to the signal frequency conversion modulation device.
The signal frequency conversion modulation device 11 is configured to perform modulation and frequency conversion processing on the received ultra high definition video TS stream signal to obtain a processed TS stream signal.
The signal power amplifying device 12 is configured to perform power amplification on 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 a transponder on the satellite.
The ultra high definition video signal is also referred to as a program signal, i.e. video content that needs to be transmitted to a remote user. The above-mentioned encoding device 10 can encode and multiplex the ultra high definition video signal as necessary according to the preset parameters; the encoding device can sample the real-time ultra-high-definition video signal and compress and encode the sampled data. Common compression coding formats are MPEG2, JPEG2000, H.264, H.265 and the like, and after compression coding, an encoding device generates an 8K ultra-high definition video TS stream signal and outputs the TS stream signal in real time.
The signal frequency conversion modulation device 11 generally needs to modulate the content of the ultra high definition video signal to a specific frequency band according to a certain format and a certain modulation method in order to transmit the ultra high definition video signal to a transponder of a satellite. That is, the signal frequency conversion modulation device 11 may receive the encoded ultra high definition video signal, perform processing adapted to a satellite transmission channel on the signal, and output the processed signal to a satellite radio frequency channel, which may also be referred to as a satellite channel adapter. The satellite channel adapter processes the received signals mainly according to two major standards of DVB-S and DVB-S2, DVB-S2 is a new generation satellite channel transmission standard, and adopts channel coding with stronger error correction capability and a modulation mode with higher transmission efficiency.
The signal processed by the signal frequency conversion modulation device 11 is actually a radio frequency signal, and in order to transmit the radio frequency signal, the problem of energy attenuation in the transmission of the radio frequency signal must be solved, so that the radio frequency signal needs to be power-amplified, that is, the signal power amplification device 12 is responsible for power amplification of the modulated TS stream signal.
The waveguide device is responsible for connecting the signal power amplification device 12 and the satellite transmitting antenna 13, providing a channel with small attenuation for the radio frequency signal, and transmitting the amplified ultra-high definition video TS stream signal (equivalent to the power amplification signal or the radio frequency signal after power amplification) to the satellite transmitting antenna; and the satellite transmitting antenna is responsible for transmitting the amplified ultra-high-definition video TS signal to a satellite for a transponder on the satellite to forward. The satellite transmitting antenna needs to accurately transmit a beam to the satellite, and generally, the satellite transmitting antenna can work in a C band, a Ku band or a Ka band. Because the C wave band has excellent rain attenuation resistance, the satellite retransmission mostly adopts C wave band radio frequency signals to carry out staring and downlink retransmission. This embodiment also preferably uses the C-band for signal forwarding.
In actual operation, after receiving the signal transmitted by the antenna in the uplink direction, the satellite receiver also needs to perform necessary frequency conversion and power amplification on the signal, and then forwards the signal to a predetermined area through the repeater. Usually, a satellite has a plurality of transponders with a plurality of bands, the uplink frequency and the downlink frequency of each transponder are different, and the signal frequency conversion modulation device is responsible for modulating and converting the video signal to the uplink frequency band of the predetermined 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, so as to correctly receive and recover the video content.
During specific implementation, the video signal source comprises an ultra-high-definition camera, an ultra-high-definition relay broadcasting vehicle, an ultra-high-definition switching platform or an ultra-high-definition player; the ultra-high definition camera, the ultra-high definition rebroadcasting vehicle, the ultra-high definition switching platform and the ultra-high definition player are all used for providing ultra-high definition video signals. That is, the video signal source may be an ultra high definition video camera, and a real-time ultra high definition video signal is obtained by shooting related content; the system can be an ultra-high-definition player and plays the ultra-high-definition video content which is manufactured in advance; the ultrahigh-definition rebroadcasting vehicle can collect a plurality of ultrahigh-definition video signals, and outputs ultrahigh-definition video program signals after the video signals are subjected to processing such as editing, processing, switching, format conversion, caption information adding and the like; or an ultra-high definition switching station, which provides switching, special effects and other manufacturing processes for two or more paths of ultra-high definition videos and outputs the manufactured ultra-high definition video signals at the same time. The ultra-high definition video signal may be an 8K ultra-high definition video signal or a higher resolution ultra-high definition video signal.
Generally, a video camera and a player provide various interfaces to output video signals, but because the data volume of 8K ultra-high definition signals is extremely large, the transmission of a common 1-channel signal transmission interface is difficult, for this reason, the present embodiment proposes a solution to output 1 channel 8K signals through a 4 channel 4K SDI interface, and at this time, the connection mode of the encoding device and the video signal source is the SDI interface cable connection through 4 channels 12G. In this case, the processing boards/processing cards/chips/logic circuits and the like that respectively process the 4-channel 4k video signals inside the encoding apparatus 10 are required to be strictly synchronized. With the advancement of technology, the transmission performance of the SDI interface will be improved, and when the SDI cable and the interface can safely and reliably realize 48G signal transmission, the video signal source and the encoding apparatus 10 can also be connected through the 1-way 48G SDI interface cable. Meanwhile, 1-path optical fiber connection is also a feasible way, and a video signal source and the encoding device 10 are required to simultaneously support the same optical transmission signal protocol.
The coding equipment is also used for sampling the 8K ultrahigh-definition video signal; and carrying out compression coding on the sampled 8K ultrahigh-definition video signals, wherein the 8K ultrahigh-definition video TS stream signals generated after coding are 1-path single-path 8K video signals or 8K ultrahigh-definition video TS stream signals formed by 4-path 4K ultrahigh-definition video TS stream signals. The compression coding format of the 8k ultra-high definition video TS stream signal output by the coding equipment can adopt H.265, and the code frequency of the compression coding can be 15-300 Mbps.
In practical situations, the satellite transmission rate of the 8K ultra-high-definition video signal is usually selected to be between 60 and 180 Mbps. The selection of the code rate mainly refers to the requirements on the decoding and broadcasting quality of a receiving and playback end, channel transmission cost, a channel coding format, a satellite transmission channel modulation mode, a satellite transponder bandwidth and the like, the coding code rate is designed according to the maximum bandwidth bearing capacity under certain economic condition constraints, meanwhile, the correct transmission of the variable code rate can be borne by the system under the condition that the coding output code rate introduced by factors such as violent lens movement, picture complexity variation and the like is unstable, the coding code rate is usually slightly reduced compared with the system code rate borne by the satellite channel, and the system code rate is only required to be provided with 2-5 Mbps allowance.
The encoding apparatus 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.
In some embodiments, the encoding apparatus 10 further includes a stream multiplexing device, and fig. 2 is a schematic mechanism diagram of an encoding apparatus; the code stream multiplexing device is respectively connected with the signal coding device and the code stream output device. Namely: when the 8K ultra high definition video TS stream signal generated after being encoded by the encoding device 10 is an 8K ultra high definition video TS stream signal composed of 4 paths of 4K ultra high definition video TS stream signals, the 4 paths of 4K ultra high definition video TS stream signals are multiplexed into 1 path of TS stream signals by a multiplexing device inside the encoding device.
In practical application, no matter whether the encoding device 10 receives 8K ultra-high-definition video signals through 1 SDI cable or receives 8K ultra-high-definition video signals through 4 paths of 12G SDI interface cables, the encoding device can completely recover 8K pictures of each frame of 8K ultra-high-definition video through a signal receiving device inside, and meanwhile, a signal sampling device inside the encoding device can sample 4 paths of 4K SDI video respectively or sample 8K pictures of one frame into 4 sub-pictures respectively, wherein each sub-picture is a 4K picture; or after the 4-path 4K SDI video is restored to 8K pictures of each frame, the pictures are resampled into 4-path 4K contents of different sampling formats.
The encoding device 10 may encode and sample 1 channel of 8K ultra high definition video into 4 channels of 4K ultra high definition video signals, or resample 4 channels of 4K ultra high definition video signals into 4 channels of 4K ultra high definition video signals of different sampling formats. The sampling modes and corresponding recombination modes of the 4 paths of 4K ultra-high-definition video signals are respectively as follows: 2SI (2sample interleave) or SQD (Square Division). The 4-channel 4K video signal includes: 4 paths of 4K video signals are collected in a 4-path 2SI mode, or 4 paths of 4K video signals are collected in a 4-path SQD mode.
A brief description of the two acquisition modes 2SI and SQD follows: SQD in the early stage, 2SI in the late stage. Fig. 3 is a schematic diagram of image signal division by an SQD method, which divides a 1-channel 8K picture into 4 independent squares, each square being a part of the entire 8K picture, and encodes the content of each square into a 1-channel 4K video signal (4 signals of 12G · SDI as shown in fig. 3); when the 8K pictures are recovered at the receiving end for splicing, the original positions of all the pictures are recovered. As shown in fig. 4, a schematic diagram of image signal division is performed by using a 2SI sampling method, where two adjacent 2 points are allocated to different paths of 4K signals, so that the content of each path of 4K pictures is identical to that of 8K pictures, and the difference is only a difference in resolution. Therefore, when the receiving end recovers the 8K picture, 1 path of 4K signal temporarily loses frames, only the brightness of the recovered 8K picture is reduced, and the understanding and watching of the audience to the video content are not influenced.
In practical application, the video signal source outputs 1-path 8K ultra-high-definition video through 4-path 4K SDI cables, and the method is a very economic and effective mode in engineering technology. Because the current 8k video technology is very advanced, the 48g sd i cable and the interface device which directly output the 8k video signal are not mature, the price is very expensive, the optical fiber interface protocol which directly outputs the 8k video signal is not mature, the application range is not wide, and the devices are difficult to be interconnected and intercommunicated. Meanwhile, the 12G 4k SDI interface is mature in technology and wide in application, and equipment using the interface is relatively convenient to interconnect and intercommunicate. Meanwhile, if the coding equipment codes 4 paths of 4K videos, the existing equipment/board card/chip can be directly utilized for integration, so that the realization cost is low, and the technology is safe and reliable. For this reason, the present invention preferably connects a video signal source and an encoding apparatus using a 4-way 4K SDI cable.
Specifically, if the ultra-high-definition video signal is a 1-channel 8K video signal, a preset signal encoding module may be adopted, and the ultra-high-definition video signal may be encoded into a 1-channel 8K ultra-high-definition video TS stream signal, or may be encoded into a 4-channel 4K ultra-high-definition video TS stream signal after resampling; if the ultra-high-definition video signal is an 8K video signal formed by 4 paths of 4K video signals, a preset signal coding module is adopted to code each path of 4K video signal respectively to obtain 4 paths of 4K ultra-high-definition video TS (transport stream) signals, and the 4 paths of 4K ultra-high-definition video TS signals are multiplexed to 1 path of TS to generate 1 path of 8K ultra-high-definition video TS signals.
The two image acquisition modes 2SI and SQD and the receiving end recovery mode have advantages respectively. The 2SI sampling mode distributes two adjacent 2 points to 4K signals of different paths, so that the content of each path of 4K pictures is identical to that of 8K pictures, and the difference is only the difference of resolution. Therefore, when the receiving end recovers the 8K picture, if 1 path of 4K signal temporarily loses frames, the brightness of the recovered 8K picture is only reduced, and the understanding and watching of the video content by the audience are not influenced. However, the video compression coding is lossy compression at present, and any adjacent pixel in each sub-picture of the picture divided by the SQD mode has relevance greater than that of the picture divided by the 2SI mode, so that the compression efficiency is improved. Under the condition of the same coding code rate, the picture quality recovered after the picture divided by the SQD mode is decoded is better than that recovered after the picture divided by the 2SI mode is decoded. The invention preferably recommends the use of the SQD mode to carry out segmentation sampling on the 8K video.
In summary, from the perspective of easy implementation of engineering, and from the viewpoint of economic efficiency of the scheme, the preferred embodiment of the present invention uses a 4-way 4K SDI cable to connect the video signal source and the encoding device, and uses the SQD method to perform segmentation sampling on the 8K video.
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 the signal receiving device and the signal sampling device inside the encoding device, and perform sampling and compression encoding in the most appropriate picture division mode. The following factors are mainly considered with respect to a suitable picture division method: the error rate of a satellite transmission channel and a coding format supported by the existing coding equipment. If the error rate of the satellite transmission channel is very small, the SQD mode can be adopted for sampling and respectively coding 4 paths of 4k videos; if the error rate of a satellite transmission channel is very small, a mature 8K encoder is provided, the satellite transmission channel can be directly encoded into 1 path of 8K ultra-high definition video TS (transport stream) signals, the compression efficiency is high, the technical links are few, the reliability is high, and the implementation is simple and convenient; if the error rate of the satellite transmission channel is higher, the satellite transmission channel can be sampled into 4 paths of 4K video signals in a 4-path 2SI mode and coded into 4 paths of 4K video TS signals. When a 2SI mode is used for collecting 1 path of 8K ultra-high-definition video signals into 4 paths of 4K video signals, each path of 4K video signal contains complete 8K picture content, and at a receiving end, if a certain path of 4K signal is abnormally received, a finally recovered picture is still complete, so that the reliability of signal transmission is facilitated, and the watching satisfaction degree of the receiving end is improved.
Further, the connection mode between the coding device 10 and the signal frequency conversion modulation device 11 is as follows: the connection is made through an ASI (Asynchronous Serial Interface) Interface cable or through an IP (internet protocol) network cable. In specific implementation, when the coding device is connected through an ASI interface, the output signal format of the coding device is TS stream Over ASI, and when the coding device is connected through an IP network, the output signal format is TS stream Over IP.
The video rebroadcasting system improves the transmission efficiency of the 8K ultra-high-definition video signals, is convenient for simultaneously transmitting ultra-high-definition video programs to multiple places and multiple addresses, reduces the popularization and application cost of the ultra-high-definition video and has important practical application value.
An embodiment of the present invention further provides a video receiving system, as shown in fig. 5, 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 outputting device 53, which are connected in sequence.
The satellite receiving antenna 50 is used for receiving a specified signal forwarded by a transponder of a satellite and sending the specified signal to the radio frequency signal power amplifying device 51; the radio frequency signal power amplification device 51 is used for performing power amplification on the specified signal; the radio frequency signal frequency conversion demodulation device 52 is configured to demodulate the power-amplified specified signal; the signal decoding output device 53 is configured to perform decoding processing on the demodulated signal and output the signal after the decoding processing to an external device.
In practical operation, the satellite receiving antenna 50 can receive weak signals transmitted by the transponder of the satellite and remove noise as much as possible. The specified signal sent by the transponder of the satellite reaches the ground and is received through an antenna surface, reflected and focused to the receiving ports of the feed source and the high-frequency head, the weak satellite retransmission signal is amplified and frequency-converted through the high-frequency head, the weak satellite retransmission signal is output by an LNB (Low noise Block, high-frequency head), and the signal is sent to a satellite receiver through a radio frequency cable; the satellite receiver demodulates the satellite signal from the tuner, decodes the demodulated signal and outputs video image signal and accompanying sound signal.
Further, the signal decoding output device 53 includes an output interface; the output interface comprises any one or more of the following: an 8K SDI interface, a 4-path 4K SDI interface, an HDMI2.1 interface, a 4-path HDMI2.0 interface and an optical fiber interface.
The signal output form of the signal decoding output device 53 includes any one or more of the following: 1-channel single-channel 8K SDI video signal; 1 path of single 8K video signal in HDMI2.1 format; 4-channel 2SI 4K SDI video signals; 4K SDI video signals of 4 SQD modes; 4-channel 2SI 4K HDMI2.0 format video signal; 4-channel video signals of 4K HDMI2.0 format of SQD mode.
The selection of the output interface of the specific signal decoding output device 53 is usually made with reference to the interface format of the subsequent video/audio playing device or recording device. Currently, a part 8K television set is provided with a 4-way HDMI2.0 format interface, a part 8K television set is provided with a 1-way HDMI2.1 format (capable of transmitting 8K ultra high definition video signals) interface, and a part monitor is provided with a 4-way 4K SDI video signal interface. And selecting the output interface of the signal decoding output device according to the interface mode of the used device. Of course, the video playing or recording device with the corresponding interface can also be selected according to the output interface mode (when there is limitation) of the signal decoding output device.
Further, the external device may include one or more of the following devices: the system comprises an 8K hard disk video recorder, an 8K video encoder, an 8K laser projection device, an 8K television, an 8K monitor, an 8K large screen device, an 8KLED large screen, an 8KMini LED large screen, a 4K television, a 4K monitor, a 4K/8K oscilloscope and a 4K/8K signal analyzer.
It should be added that, as is clear to those skilled in the art, the ultra high definition video signal or the ultra high definition program signal not only contains video content, but also contains audio content or is called audio content, so that the video signal, the ultra high definition video signal, and the like mentioned in the present invention can be understood as the ultra high definition video signal carrying both video information and audio information.
It should be added that, although the invention and its embodiments are described in the technical content of the invention, in many cases, 8K ultra high definition video is used, those skilled in the art will readily understand that the replacement of 8K ultra high definition video with 10K, 12K or 16K ultra high definition video can be implemented without any creative work on the basis of the invention. Therefore, the 8K ultra high definition video is not a technical limitation of the present invention, but is merely an example for easy understanding of the user.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. A video relay broadcasting system is characterized in that the system comprises 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 with the coding equipment through an SDI cable or an optical fiber; the coding equipment is connected with the signal frequency conversion modulation equipment; the signal frequency conversion modulation equipment is connected with the signal power amplification equipment through a radio frequency cable; the signal power amplifying device is connected with the satellite transmitting antenna through waveguide equipment;
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 (transport stream) signal, and sends the ultra-high definition video TS signal to the signal frequency conversion modulation device;
the signal frequency conversion modulation equipment is used for modulating and frequency converting the received ultra-high definition video TS stream signal to obtain a processed TS stream signal;
the signal power amplification equipment is used for carrying out power amplification on the processed TS flow signal to obtain a power amplification signal;
the waveguide device is used for transmitting the power amplification signal to a satellite transmitting antenna, so that the satellite transmitting antenna transmits the power amplification signal to a satellite for being forwarded by a repeater on the satellite.
2. The system of claim 1, wherein the video signal source comprises: an ultra-high definition camera, an ultra-high definition rebroadcasting vehicle, an ultra-high definition switching platform or an ultra-high definition player;
the ultra-high-definition camera, the ultra-high-definition rebroadcasting vehicle, the ultra-high-definition switching platform and the ultra-high-definition player are all used for providing the ultra-high-definition video signals.
3. The system of claim 1, wherein the connection between the encoding device and the video signal source comprises any one of:
the SDI interface cable is connected through a 1-path 48G SDI interface cable;
the SDI interface cable is connected through a 4-path 12G SDI interface cable;
through 1 optical fiber connection.
4. The system according to claim 3, wherein the ultra high definition video signal is an 8K ultra high definition video signal; the encoding device is further configured to:
sampling the 8K ultrahigh-definition video signal;
and carrying out compression coding on the sampled 8K ultrahigh-definition video signals, wherein the 8K ultrahigh-definition video TS stream signals generated after coding are 1-path single-path 8K video signals or 8K ultrahigh-definition video TS stream signals formed by 4-path 4K ultrahigh-definition video TS stream signals.
5. The system according to claim 4, wherein the compressed encoding format of the 8k ultra high definition video TS stream signal output by the encoding device is H.265, and the code frequency of the compressed encoding is 15-300 Mbps.
6. The system according to claim 3, wherein the coding device comprises a signal receiving device, a signal sampling device, a signal coding device and a code stream output device which are connected in sequence.
7. The system of claim 6, wherein the signal sampling device is configured to:
and (3) adopting a 2SI mode or an SQD mode to code and sample 1 path of 8K ultrahigh-definition video into 4 paths of 4K ultrahigh-definition video.
8. The system according to claim 6, wherein said encoding apparatus further comprises code stream multiplexing means; the code stream multiplexing device is respectively connected with the signal encoding device and the code stream output device;
the code stream multiplexing device is used for: and multiplexing 4 paths of 4K ultra-high-definition video TS signals into 1 path of TS signals.
9. The system according to claim 1, wherein the coding device is connected to the signal frequency conversion modulation device in a manner that: connected by ASI interface cables or connected by IP network cables.
10. A video receiving system is characterized by comprising a satellite receiving antenna, a radio frequency signal power amplifying device, a radio frequency signal frequency conversion demodulating device and a signal decoding output device which are connected in sequence;
the satellite receiving antenna is used for receiving a specified signal forwarded by a transponder of a satellite and sending the specified signal to the radio-frequency signal power amplification equipment;
the radio frequency signal power amplification equipment is used for carrying out power amplification on the specified signal;
the radio frequency signal frequency conversion demodulation equipment is used for demodulating the specified signal after power amplification;
the signal decoding output device is used for decoding the demodulated signal and outputting the decoded signal to an external device.
11. The video receiving system according to claim 10, wherein the signal decoding output device includes an output interface; the output interface comprises any one or more of the following interfaces:
an 8K SDI interface, a 4-path 4K SDI interface, an HDMI2.1 interface, a 4-path HDMI2.0 interface and an optical fiber interface.
12. The video receiving system of claim 11, wherein the signal decoding output device has a signal output form including any one or more of:
1-channel single-channel 8K SDI video signal; 1 path of single 8K video signal in HDMI2.1 format; 4-channel 2SI 4K SDI video signals; 4K SDI video signals of 4 SQD modes; 4-channel 2SI 4K HDMI2.0 format video signal; 4-channel video signals of 4K HDMI2.0 format of SQD mode.
13. The video receiving system of claim 10, wherein the external device comprises one or more of the following: the system comprises an 8K hard disk video recorder, an 8K video encoder, an 8K laser projection device, an 8K television, an 8K monitor, an 8K large screen device, an 8KLED large screen, an 8K Mini LED large screen, a 4K television, a 4K monitor, a 4K/8K oscilloscope and a 4K/8K signal analyzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010526221.8A CN111726700A (en) | 2020-06-10 | 2020-06-10 | Video relay system and video receiving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010526221.8A CN111726700A (en) | 2020-06-10 | 2020-06-10 | Video relay system and video receiving system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111726700A true CN111726700A (en) | 2020-09-29 |
Family
ID=72567920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010526221.8A Pending CN111726700A (en) | 2020-06-10 | 2020-06-10 | Video relay system and video receiving system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111726700A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112565634A (en) * | 2020-12-11 | 2021-03-26 | 中仪英斯泰克进出口有限公司 | Rebroadcasting vehicle with ultrahigh-definition production and broadcast system |
| CN112700741A (en) * | 2020-12-04 | 2021-04-23 | 北京牡丹视源电子有限责任公司 | Four-link connection sequence judgment system and method based on 8K signal |
| CN114286023A (en) * | 2021-12-31 | 2022-04-05 | 北京中联合超高清协同技术中心有限公司 | 8K ultra-high-definition rebroadcasting vehicle supporting multi-scene multi-mode switching and rebroadcasting method |
| CN114302062A (en) * | 2021-12-31 | 2022-04-08 | 北京中联合超高清协同技术中心有限公司 | 4K and 8K mixed follow-up ultra-high-definition on-site manufacturing system |
| CN114302061A (en) * | 2021-12-31 | 2022-04-08 | 北京中联合超高清协同技术中心有限公司 | Ultrahigh-definition video rebroadcasting vehicle and method for synchronously and mixedly manufacturing 8K and 4K |
| CN116132615A (en) * | 2023-01-14 | 2023-05-16 | 北京流金岁月传媒科技股份有限公司 | Conversion method and device for ultrahigh-definition 8K HDMI2.1 to 4x12G-SDI |
| CN117319591A (en) * | 2023-09-25 | 2023-12-29 | 深圳市厚朴科技开发有限公司 | Device, method, system, equipment and medium for remotely transmitting ultra-high definition video |
-
2020
- 2020-06-10 CN CN202010526221.8A patent/CN111726700A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112700741A (en) * | 2020-12-04 | 2021-04-23 | 北京牡丹视源电子有限责任公司 | Four-link connection sequence judgment system and method based on 8K signal |
| CN112565634A (en) * | 2020-12-11 | 2021-03-26 | 中仪英斯泰克进出口有限公司 | Rebroadcasting vehicle with ultrahigh-definition production and broadcast system |
| CN114286023A (en) * | 2021-12-31 | 2022-04-05 | 北京中联合超高清协同技术中心有限公司 | 8K ultra-high-definition rebroadcasting vehicle supporting multi-scene multi-mode switching and rebroadcasting method |
| CN114302062A (en) * | 2021-12-31 | 2022-04-08 | 北京中联合超高清协同技术中心有限公司 | 4K and 8K mixed follow-up ultra-high-definition on-site manufacturing system |
| CN114302061A (en) * | 2021-12-31 | 2022-04-08 | 北京中联合超高清协同技术中心有限公司 | Ultrahigh-definition video rebroadcasting vehicle and method for synchronously and mixedly manufacturing 8K and 4K |
| CN114302061B (en) * | 2021-12-31 | 2023-08-29 | 北京中联合超高清协同技术中心有限公司 | 8K and 4K synchronous mixed manufactured ultra-high definition video rebroadcasting vehicle and rebroadcasting method |
| CN114286023B (en) * | 2021-12-31 | 2023-08-29 | 北京中联合超高清协同技术中心有限公司 | 8K ultra-high definition rebroadcasting vehicle supporting multi-scene multi-mode switching and rebroadcasting method |
| CN114302062B (en) * | 2021-12-31 | 2024-04-09 | 北京中联合超高清协同技术中心有限公司 | 4K and 8K mixed follow-up ultra-high definition field manufacturing system |
| CN116132615A (en) * | 2023-01-14 | 2023-05-16 | 北京流金岁月传媒科技股份有限公司 | Conversion method and device for ultrahigh-definition 8K HDMI2.1 to 4x12G-SDI |
| CN116132615B (en) * | 2023-01-14 | 2023-10-20 | 北京流金岁月传媒科技股份有限公司 | Conversion method and device for ultrahigh-definition 8K HDMI2.1 to 4x12G-SDI |
| CN117319591A (en) * | 2023-09-25 | 2023-12-29 | 深圳市厚朴科技开发有限公司 | Device, method, system, equipment and medium for remotely transmitting ultra-high definition video |
| CN117319591B (en) * | 2023-09-25 | 2024-03-12 | 深圳市厚朴科技开发有限公司 | Video transmission method, device, computer readable storage medium and equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111726700A (en) | Video relay system and video receiving system | |
| US7542511B2 (en) | Wireless RF link for uncompressed transmission of HDTV signals | |
| US9681102B2 (en) | Method and system for tracking actual channel content output | |
| US20040196404A1 (en) | Apparatus for wireless RF transmission of uncompressed HDTV signal | |
| US6816704B1 (en) | Communication method, radio base station apparatus and radio terminal apparatus | |
| US8938751B2 (en) | Method and system for placing inserts into a broadcast television signal | |
| JP2009105902A (en) | Method and apparatus for splicing compressed information signal | |
| CN110247694B (en) | Decoding forwarding-based satellite communication and satellite television signal IP fusion relay method | |
| KR101259449B1 (en) | An apparatus and method for digital picture signalprocessing of high-speed camera | |
| US9055316B2 (en) | Method and system for inserting digital video effects into a video stream at a multiplexing device after routing | |
| US7934228B2 (en) | Method and system for marking video signals for identification | |
| US8619822B2 (en) | Method and system for generating uplink signals from a ground segment | |
| US9247285B2 (en) | Method and system for monitoring a content signal | |
| US8239913B2 (en) | Method and system for inserting digital video effects into a video stream in redundant paths before routing | |
| CN111770065A (en) | Uplink transmission method and downlink transmission method of ultra-high definition video signal | |
| US20080244663A1 (en) | Method and system for inserting digital video effects into a video stream using a bypass router | |
| KR100881371B1 (en) | Apparatus of transmitting real time moving picture using wireless multiple access, apparatus of receiving real time moving picture using wireless multiple access, apparatus of transmitting/receiving real time moving picture using wireless multiple access and method thereof | |
| CN112672223B (en) | High-reliability distribution method for ultra-high definition video satellite transmission | |
| JP2004180189A (en) | Retransmission system and receiving system of digital broadcasting | |
| Oyamada et al. | Progress of transmission technologies for UDTV | |
| KR100925360B1 (en) | System for processing broadcasting-signal using the satellite digital broadcasting media gateway and broadcast-receiving apparatus | |
| CN216819966U (en) | Support clear full service relay car of 5G and 8K superelevation of satellite relay | |
| US9277182B2 (en) | Method and system for interrupting inserted material in a content signal | |
| US7535965B2 (en) | Systems and methods for wireless transmission of uncompressed HDTV signals | |
| US20080239163A1 (en) | Method and system for inserting digital video effects into a video stream after bypass routing and before encoding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |