CN111726700B - Video broadcasting system and video receiving system - Google Patents
Video broadcasting system and video receiving system Download PDFInfo
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- CN111726700B CN111726700B CN202010526221.8A CN202010526221A CN111726700B CN 111726700 B CN111726700 B CN 111726700B CN 202010526221 A CN202010526221 A CN 202010526221A CN 111726700 B CN111726700 B CN 111726700B
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- 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
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- 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 or rendering scenes according to encoded video stream scene graphs
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Abstract
本发明提供了一种视频转播系统和视频接收系统，该视频转播系统中的编码设备对接收的超高清视频信号进行编码，得到超高清视频TS流信号，并将超高清视频TS流信号发送至信号变频调制设备；信号变频调制设备对接收的超高清视频TS流信号进行调制和频率变换，得到处理后的TS流信号；信号功率放大设备用于对处理后的TS流信号进行功率放大，得到功率放大信号；波导设备将功率放大信号传输给卫星发射天线，以使卫星发射天线将功率放大信号发射至卫星，供卫星上的转发器转发使用。地面接收到卫星转发的信号后，进行频率变换功率放大和解调和解码，恢复出超高清视频信号进行播放或者记录。本发明提高了8K超高清视频信号的传输效率。
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
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, namely 4K and 8K commonly known, according to ITU-R bt.2020 "ultra-high definition television system program production and international switching parameter values" and GY/T307-2017 "ultra-high definition television system program production and switching parameter values". From the perspective of a television terminal, a television set capable of receiving, processing, and displaying ultra-high definition programs is referred to as 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 line, the resolution of the 8K ultra-high definition television screen is 7680 multiplied by 4320 pixels, and the definition can reach 4320 television line. And the transmission rate of the ultra-high definition video is at least 12-40Mbps, and the transmission rate of the 8K video is at least 48-160Mbps according to the H.265 standard (350-1000 compression ratio). Some research applications of 10K ultra-high definition video, 12K ultra-high definition video and 16K ultra-high definition video are currently being performed.
Because the data volume of the 8K ultra-high definition video and the ultra-high definition video with resolution of more than 8K is very large, the technical difficulty is very high for the transmission of the 8K ultra-high strength video, and the requirements on a technical system for the transmission are very high. At present, the main technical scheme of video transmission comprises broadcast transmission of an open broadcast television signal transmitting tower, cable television network transmission, IPTV television private network transmission, internet transmission, satellite transmission and the like. The transmission tower broadcasting mode is used for transmitting signals, the effective transmission distance is limited, the transmission mode is the transmission mode of the earliest generation television signals, the actual user use amount is extremely small at present, the cable television network transmission mainly solves the problem that the transmission of television signals in a metropolitan area is generally realized, a cable television network company transmits programs to end users, the cable television network company rarely bears cross-metropolitan area transmission, the IPTV television private network transmission is similar to the cable television network transmission, the problem that programs are transmitted to the end users in the metropolitan area is mainly solved, the Internet transmission is a newly-developed technology, the requirements of different users can be flexibly met, personalized programs are respectively transmitted for each end user, and the network bandwidth and the cost required by large-scale transmission are extremely large. The above transmission modes have incompatible factors in the aspect of 8K ultra-high definition video content transmission, so that a more convenient and efficient transmission mode is urgently needed to be found, and satellite transmission becomes an alternative technical approach.
Typically, the reporting of major news events, or sporting events, will be done using live reports, or a combination of live reports and a studio. Then, how to transmit the video image reported on site to the studio, process it by the broadcasting control system in the television station, add station logo and caption, and broadcast to the public after safe broadcasting control is the urgent need to be solved. After the ultra-high definition era, especially with the application and development of 8k video, those skilled in the art have been exploring various ultra-high speed transmission modes, transmission systems and transmission links. At present, the application is widely used for 4G wireless communication transmission, microwave transmission and Internet transmission. However, the security reliability and bandwidth of these transmission modes are very high, and it is difficult to actually transmit 8k ultra-high definition video programs, so that the satellite transmission system becomes an alternative technical approach. But there is no relatively mature and complete solution and system connection mode.
Although the transmission system and the video receiving system of the 8K ultra-high definition video signal are basically source coding, channel modulation, power enhancement and transmission, and signal demodulation and decoding are carried out after satellite forwarding, only successful experience of transmitting 4K ultra-high definition video through a satellite is internationally achieved, the technical constitution of a commercial 8K ultra-high definition video satellite transmission system is not disclosed at present, corresponding technical standards are also absent, and the equipment composition and the connection mode of the 8K ultra-high definition video satellite transmission and video receiving system are not disclosed. Although the transmission of the 8K ultra-high definition video can be realized through the Internet, the bandwidth and the real-time performance of the transmission network are very high, and meanwhile, if one program needs to be distributed to a plurality of users, the cost of the bandwidth and the traffic is very high, so that the further wide application of the 8K ultra-high definition video service is restricted to a great extent.
Because 8K technology development is relatively immature, the technical standards of a plurality of 8K video related sampling devices, coding devices, modulation devices, decoding devices and the like are not uniform, output interfaces are different, the devices are difficult to interconnect and communicate with each other, and the device constitution mode, the signal conversion mode, the interface protocol, the code rate suitable for the system and the like of a complete 8K video satellite transmission system are not clear, so that the 8K ultra-high definition video is difficult to transmit by using a satellite transmission mode in the industry. Meanwhile, the ultra-high definition rebroadcast vehicle, the ultra-high definition camera and the ultra-high definition switching platform system for producing the ultra-high definition video have various internal working principles, system connection modes, external output interface modes of the system and composition modes of output contents. In this case, the precise identification and clear definition of the output interface and the output content composition form of various ultra-high definition signal sources are very important for the subsequent coding transmission links.
Aiming at the technical problems, the prior art does not see the technical proposal for solving.
Disclosure of Invention
The invention aims to provide a video rebroadcasting system and a video receiving system, which are used together with a relatively mature satellite forwarding system to realize high-efficiency transmission of ultra-high definition video in a satellite rebroadcasting/live broadcasting mode.
In a first aspect, an embodiment of the present invention provides a video rebroadcasting system, where the system includes an encoding device, a signal variable frequency modulation device, a signal power amplification device and a satellite transmitting antenna, where the video signal source is connected to the encoding device through an SDI cable or an optical fiber, the encoding device is connected to the signal variable frequency modulation device, the signal variable frequency modulation device is connected to the signal power amplification device through a radio frequency cable, the signal power amplification device is connected to the satellite transmitting antenna through a waveguide device, the encoding device receives an ultra-high definition video signal provided by the 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 sends the ultra-high definition video TS stream signal to the signal variable frequency modulation device, the signal variable frequency modulation device is used for modulating and frequency transforming the received ultra-high definition video TS stream signal to obtain a processed TS stream signal, the signal power amplification device is used for power amplifying the processed TS stream signal to obtain a power amplified signal, and the waveguide device is used for transmitting the power amplified signal to the satellite transmitting antenna to a satellite for a transponder on the satellite.
Further, the video signal source comprises an ultra-high definition camera, an ultra-high definition rebroadcasting vehicle, an ultra-high definition switching table or an ultra-high definition player, wherein the ultra-high definition camera, the ultra-high definition rebroadcasting vehicle, the ultra-high definition switching table and the ultra-high definition player are all used for providing ultra-high definition video signals.
Further, the connection mode of the encoding device and the video signal source comprises any one of connection through a 1-path 48G SDI interface cable, connection through a 4-path 12G SDI interface cable and connection through a 1-path optical fiber.
Furthermore, the encoding device is also used for sampling the 8K ultra-high definition video signals, compressing and encoding the sampled 8K ultra-high definition video signals, wherein the 8K ultra-high definition video TS stream signals generated after encoding are 8K ultra-high definition video TS stream signals formed by 1 single 8K video signal or 4K ultra-high 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 compression coding is 15-300 Mbps.
Further, the encoding device comprises a signal receiving device, a signal sampling device, a signal encoding device and a code stream output device which are connected in sequence.
Furthermore, the signal sampling device is used for encoding and sampling 1-path 8K ultra-high definition video into 4-path 4K ultra-high definition video by adopting a 2SI mode or an SQD mode.
The coding equipment further comprises a code stream multiplexing device, wherein the code stream multiplexing device is respectively connected with the signal coding device and the code stream output device, and the code stream multiplexing device is used for multiplexing 4 paths of 4K ultra-high definition video TS stream signals into 1 path of TS stream signals.
Furthermore, the connection mode of the encoding equipment and the signal variable frequency modulation equipment is that the encoding equipment and the signal variable frequency modulation equipment are connected through ASI interface cables or through 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 output device that are sequentially connected, where the satellite receiving antenna is configured to receive a specified signal forwarded by a transponder of a satellite and send the specified signal to the radio frequency signal power amplifying device, the radio frequency signal power amplifying device is configured to power amplify the specified signal, the radio frequency signal frequency conversion demodulating device is configured to demodulate the power amplified specified signal, and the signal decoding output device is configured to decode the demodulated signal and output the decoded signal to an external device.
Further, the signal decoding output device comprises an output interface, wherein the output interface comprises any one or more of an 8K SDI interface, a 4-way 4K SDI interface, an HDMI2.1 interface, a 4-way HDMI2.0 interface and an optical fiber interface.
Further, the signal output form of the signal decoding output device comprises any one or more of 1-channel 8K SDI video signal, 1-channel 8K HDMI2.1 format video signal, 4-channel 2SI 4K SDI video signal, 4-channel 2SI 4K HDMI 2.0 format video signal and 4-channel SQD 4K HDMI 2.0 format video signal.
Further, the external devices include one or more of 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.
The embodiment of the invention has the following beneficial effects:
The embodiment of the invention provides a video rebroadcasting system and a video receiving system, wherein a coding device in the video rebroadcasting system codes a super-high definition video signal provided by a received video signal source to obtain a super-high definition video TS stream signal, the super-high definition video TS stream signal is sent to a signal variable frequency modulation device, the signal variable frequency modulation device modulates and frequency transforms the received super-high definition video TS stream signal to obtain a processed TS stream signal, a signal power amplification device is used for amplifying the processed TS stream signal to obtain a power amplification signal, and a waveguide device transmits the power amplification signal to a satellite transmitting antenna to enable the satellite transmitting antenna to transmit the power amplification signal to a satellite and forward the power amplification signal to the ground through a satellite transponder. After receiving the signals forwarded by the satellite, the ground video receiving system performs frequency conversion power amplification, demodulation, demultiplexing and decoding on the forwarded signals, and resumes 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 transmitting the ultra-high definition video program to multiple sites simultaneously, 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 equipment used in the systems cannot be interconnected and intercommunicated, solves the problem of huge flow expense 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 broadcasting and rebroadcasting or distributing 8K ultra-high definition video to a plurality of target receiving sites. The invention determines the corresponding relation between the 8K ultra-high definition video coding code rate and the satellite transmission channel through a large number of early-stage technical experiments, gives out the range of 8K ultra-high definition video coding code rate control, determines the constitution of equipment consisting of a satellite rebroadcasting/direct broadcasting system, and the signal connection mode, interface mode and control connection relation among the systems, thereby clearing technical barriers for the wide application of 8K ultra-high definition video transmission through satellites.
Additional features and advantages of the invention will be set forth in the description which follows, or in part will be obvious from the description, or may be learned by practice of the invention.
In order to make the above objects, features and advantages of the present invention more 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 that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a video rebroadcasting 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 SQD 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
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In consideration of the problem of low transmission efficiency of ultra-high definition video signals in the prior art, the embodiment of the invention provides a video rebroadcasting system and a video receiving system, and the technology can be applied to application scenes such as satellite video rebroadcasting, video playing, satellite live broadcasting, ultra-high definition video content transmission through satellites and the like.
For the sake of understanding the present embodiment, a video rebroadcasting system disclosed in the present embodiment of the present invention will be described in detail first, and as shown in fig. 1, the system includes an encoding device 10, a signal variable frequency modulation device 11, a signal power amplification device 12, and a satellite transmitting antenna 13, a video signal source is connected to the encoding device 10 through an SDI (SERIAL DIGITAL INTERFACE, digital component serial interface) cable or optical fiber, the encoding device 10 is connected to the signal variable frequency modulation device 11, the signal variable frequency modulation device 11 is connected to the signal power amplification device 12 through a radio frequency cable, and the signal power amplification device 12 is connected to the satellite transmitting antenna 13 through a waveguide device.
The encoding apparatus 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 (TS) Stream signal, and transmits the ultra-high definition video TS (Transport Stream) Stream signal to a signal variable frequency modulation apparatus.
The signal frequency conversion modulation device 11 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 amplifying device 12 is used for carrying out power amplification on the processed TS stream signal to obtain a power amplified signal, and the waveguide device is used for transmitting the power amplified signal to the satellite transmitting antenna 13 so that the satellite transmitting antenna 13 transmits the power amplified signal to a satellite for retransmission by a transponder on the satellite.
The above ultra-high definition video signal, i.e., video content that needs to be transmitted to a remote user, may also be referred to as a program signal. The above-mentioned encoding device 10 can encode the ultra-high definition video signal according to the preset parameters and the necessary multiplexing process, and usually needs to receive the ultra-high definition video signal transmitted by the signal source during encoding, so that the encoding device can sample the real-time ultra-high definition video signal and compress and encode the sampled data. Common compression coding formats include MPEG2, JPEG2000, H.264, H.265, etc., and the compression coding device generates an 8K ultra-high definition video TS stream signal and outputs the signal in real time.
The signal variable frequency 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 modulation scheme in order to transmit the ultra-high definition video signal to a satellite transponder. That is, the signal variable frequency modulation device 11 may receive the encoded ultra-high definition video signal, perform processing for adapting the signal to a satellite transmission channel, 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 following two major standards of DVB-S and DVB-S2, DVB-S2 is a new generation satellite channel transmission standard, and adopts a channel coding mode 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 signal, the energy attenuation problem in the transmission of the signal must be solved, so that the radio frequency signal needs to be amplified, that is, the signal power amplifying device 12 is responsible for amplifying the modulated TS stream signal.
The waveguide device is responsible for connecting the signal power amplifying device 12 and the satellite transmitting antenna 13, providing a channel with small attenuation for radio frequency signals, transmitting amplified ultra-high definition video TS stream signals (equivalent to the power amplified signals or the radio frequency signals after power amplification) to the satellite transmitting antenna, and the satellite transmitting antenna is responsible for transmitting the amplified ultra-high definition video TS stream signals to a satellite for retransmission by a transponder on the satellite. Satellite transmitting antennas need to accurately transmit beams to satellites, and typically satellite transmitting antennas can operate in the C-band, ku-band, or Ka-band. Because the C wave band has excellent rain attenuation resistance, satellite retransmission is carried out by adopting C wave band radio frequency signals for uplink and downlink retransmission. The present embodiment also preferably uses the C-band for signal forwarding.
In practical operation, after receiving the signal transmitted by the antenna, 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 a transponder. Typically, there will be a plurality of transponders in a plurality of bands on a satellite, and each transponder will have a different uplink frequency and downlink frequency, and the signal conversion modulation device is responsible for modulating and converting the video signal to a predetermined uplink frequency band of the satellite transponder. Also, in the receiving system, the operating frequency of the radio frequency receiving device of the satellite signal receiving system needs to be set to the downlink frequency band of the predetermined transponder to correctly receive and recover the video content.
In a specific implementation, the video signal source comprises an ultra-high-definition camera, an ultra-high-definition rebroadcasting vehicle, an ultra-high-definition switching table or an ultra-high-definition player, wherein the ultra-high-definition camera, the ultra-high-definition rebroadcasting vehicle, the ultra-high-definition switching table and the ultra-high-definition player are all used for providing ultra-high-definition video signals. The video signal source can be an ultra-high definition video camera, an ultra-high definition player, an ultra-high definition rebroadcasting vehicle, an ultra-high definition video program signal output after editing, switching, format conversion, subtitle information adding and other processes are carried out on a plurality of ultra-high definition video signals, or an ultra-high definition switching station, and two or more paths of ultra-high definition videos are provided with switching, special effects and other manufacturing processes, and meanwhile manufactured ultra-high definition video signals are output. The ultra-high-definition video signal may be an 8K ultra-high-definition video signal or a higher-resolution ultra-high-definition video signal.
The video camera and the player usually provide various interfaces to output video signals, but because the data volume of the 8K ultra-high definition signals is extremely huge, the common 1-channel signal transmission interface is difficult to transmit, and for this reason, the embodiment proposes a solution, the 1-channel 8K signals are output through the 4-channel 4K SDI interface, and the connection mode of the coding device and the video signal source is that the coding device is connected through the 4-channel 12G SDI interface cable. In this case, a processing board/processing card/chip/logic circuit or the like that processes the 4-channel 4k video signals, respectively, inside the encoding apparatus 10 is required to perform strict synchronization. With the progress of technology, the transmission performance of the SDI interface will also be improved, and when the SDI cable and the interface can safely and reliably realize the 48G signal transmission, the video signal source and the encoding device 10 can also be connected through the SDI interface cable of 1 path 48G. At the same time, a 1-way fiber optic connection is also a viable way, requiring the video signal source to support the same optical transmission signal protocol as the encoding device 10.
The encoding device is also used for sampling the 8K ultra-high definition video signals, compressing and encoding the sampled 8K ultra-high definition video signals, wherein the 8K ultra-high definition video TS stream signals generated after encoding are 8K ultra-high definition video TS stream signals formed by 1 single 8K video signal or 4K ultra-high definition video TS stream signals. The compression coding format of the 8k ultra-high definition video TS stream signal output by the coding device can adopt H.265, and the code frequency of compression coding can be 15-300 Mbps.
In practical situations, the satellite transmission code rate of the 8K ultra-high definition video signal is usually selected to be 60 Mbps-180 Mbps. The code rate is mainly selected by referring to the requirements of decoding broadcasting quality of a receiving playback end, channel transmission cost, channel coding format, satellite transmission channel modulation mode, satellite transponder bandwidth and the like, the coding code rate is designed according to the maximum bandwidth bearing capacity under the constraint of certain economic conditions, and meanwhile, under the condition of guaranteeing that the coding output code rate is unstable due to factors such as severe lens movement, picture complexity change and the like, the system can bear correct transmission of the changed code rate, the coding code rate is usually slightly reduced compared with the system code rate borne by a satellite channel, and 2-5 Mbps allowance is reserved for the system code rate.
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 sequentially connected.
In some embodiments, the encoding apparatus 10 further includes a stream multiplexing device, as shown in fig. 2, which is a schematic diagram of a mechanism of the encoding apparatus, where the stream multiplexing device is connected to the signal encoding device and the stream output device, respectively. That is, when the 8K super-high definition video TS stream signal generated after encoding by the encoding device 10 is an 8K super-high definition video TS stream signal composed of 4 paths of 4K super-high definition video TS stream signals, the 4 paths of 4K super-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 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 cable, the encoding device can restore each frame 8K picture of the 8K ultra-high definition video completely through the signal receiving device inside, meanwhile, the signal sampling device inside the encoding device can sample 4 paths of 4K SDI video respectively, or sample one frame 8K picture into 4 sub-pictures, each sub-picture is 4K picture, and after restoring 4 paths of 4K SDI video into each frame 8K picture, the picture can be resampled into 4 paths of 4K content with different sampling formats.
The above-mentioned encoding device 10 may sample 1 path of 8K super high definition video encoding into 4 paths of 4K super high definition video signals, or resample 4 paths of 4K super high definition video signals into 4 paths of 4K super high definition video signals with different sampling formats. The sampling mode of the 4-channel 4K ultra-high definition video signal and the corresponding recombination mode thereof are respectively a 2SI (2 sample interleave, two-sample interleaving) mode or a SQD (Square Division, four-equal Square Division) mode. The 4 paths of 4K video signals comprise 4 paths of 4K video signals acquired in a4 path 2SI mode or 4 paths of 4K video signals acquired in a4 path SQD mode.
A brief description of the two acquisition modes, 2SI and SQD, is as follows, initial SQD, later 2SI. As shown in fig. 3, the image signal is divided by the SQD method, the SQD method divides the 1-channel 8K picture into 4 independent squares, each square is a part of the whole 8K picture, the content of each square is encoded into 1-channel 4K video signal (such as the 4 signals of 12g·sdi shown in fig. 3), and when the receiving end restores the 8K picture to splice, the receiving end restores the original positions of the respective channels of pictures. As shown in fig. 4, the image signal is divided by adopting a 2SI method, and the 2SI sampling method is to allocate two adjacent 2 points to 4K signals of different paths, so that the content of each path of 4K picture is identical to that of 8K picture, and the difference is only the difference of resolution. Therefore, when the receiving end recovers 8K pictures, 1 path of 4K signals temporarily lose frames, only the brightness of the recovered 8K pictures is reduced, and the understanding and watching of the video content by the audience 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 front-end, the 48G SDI cable and interface equipment for directly outputting 8k video signals are not mature, the price is very expensive, the optical fiber interface protocol for directly outputting 8k video signals is not mature, the application range is not wide, and the equipment is difficult to interconnect and communicate. Meanwhile, the SDI interface technology of 12G 4k is mature, the application is wide, and the equipment interconnection and intercommunication using the interface are relatively convenient. Meanwhile, if the encoding device encodes 4 paths of 4K video, the encoding device can directly integrate the 4 paths of 4K video by using the existing device/board card/chip, so that the realization cost is low, and the technique is safe and reliable. For this purpose, the present invention preferably uses a 4-way 4K SDI cable to connect the video signal source and the encoding apparatus.
Specifically, if the ultra-high definition video signal is 1 path of 8K video signal, a preset signal coding module can be adopted to code the ultra-high definition video signal into 1 path of 8K ultra-high definition video TS stream signal, or 4 paths of 4K ultra-high definition video TS stream signal can be obtained after resampling, and if the ultra-high definition video signal is 8K video signal formed by 4 paths of 4K video signals, each path of 4K video signal is respectively coded by adopting the preset signal coding module, 4 paths of 4K ultra-high definition video TS stream signal are coded, and 4 paths of 4K ultra-high definition video TS stream signal are multiplexed onto 1 path of TS stream to generate 1 path of 8K ultra-high definition video TS stream signal.
Regarding the selection of the two image acquisition modes of 2SI and SQD and the receiving end recovery mode, the two modes have advantages. The 2SI sampling mode distributes 2 adjacent points to 4K signals of different paths, so that the content of each path of 4K picture is identical to that of an 8K picture, and the difference is only the difference of resolution. Therefore, when the receiving end recovers 8K pictures, if 1 path of 4K signals temporarily lose frames, only the brightness of the recovered 8K pictures is reduced, and the understanding and watching of the video content by the audience are not influenced. However, since the current video compression coding is a lossy compression, SQD-mode split picture, any adjacent pixel in each sub-picture thereof has a correlation greater than that of a2 SI-mode split picture, which is advantageous for improving compression efficiency. Under the condition of the same coding rate, the picture quality recovered after the SQD mode split picture is decoded is better than that recovered after the 2SI mode split picture is decoded. The invention preferably recommends using the SQD approach to split sampling of 8K video.
In summary, from the viewpoint of engineering easy realization, and from the aspect of economy of the scheme, the preferred embodiment of the invention uses a 4-way 4K SDI cable to connect a video signal source and a coding device, and uses an SQD method to split and sample 8K video.
In practice, no matter how the video signal source is transmitted to the encoding device, the encoding device may resample the 8k video by cooperation of its internal signal receiving apparatus and signal sampling apparatus, and sample and compression encode in the most suitable picture division manner. The appropriate picture division mode mainly considers the following factors of satellite transmission channel error rate and the coding format supported by the existing coding equipment. If the error rate of the satellite transmission channel is very small, the satellite transmission channel can be sampled into 4 paths of 4K video signals for coding respectively in an SQD mode, and if the error rate of the satellite transmission channel is very small, the satellite transmission channel is provided with a mature 8K coder, the satellite transmission channel can be directly coded into 1 path of 8K ultra-high definition video TS stream signals, the compression efficiency is high, the technical links are few, the reliability is high, the implementation is simple and convenient, and if the error rate of the satellite transmission channel is relatively high, the satellite transmission channel can be sampled into 4 paths of 4K video signals in a 4 path of 2SI mode, and the satellite transmission channel is coded into 4 paths of 4K video TS signals. When the 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 signals contains complete 8K picture content, and at a receiving end, if a certain path of 4K signals are abnormally received, finally recovered pictures are still complete, so that the reliability of signal transmission is facilitated, and the watching satisfaction degree of the receiving end is improved.
Further, the above-mentioned encoding device 10 and the signal variable frequency modulation device 11 are connected by an ASI (Asynchronous serial interface) interface cable or by an IP (Internet Protocol ) network cable. When the signal is connected through an ASI interface, the signal format output by the coding equipment is TS stream Over ASI, and when the signal is connected through an IP network, the output signal format is TS stream Over IP.
The video rebroadcasting system improves the transmission efficiency of 8K ultra-high definition video signals, is convenient for simultaneously transmitting the ultra-high definition video programs to multiple places in multiple addresses, reduces the popularization and application cost of the ultra-high definition video, and has important practical application value.
The embodiment of the invention also provides a video receiving system, as shown in fig. 5, which comprises a satellite receiving antenna 50, a radio frequency signal power amplifying device 51, a radio frequency signal variable frequency demodulation device 52 and a signal decoding output device 53 which are connected in sequence.
The satellite receiving antenna 50 is used for receiving a designated signal forwarded by a transponder of a satellite and transmitting the designated signal to the radio frequency signal power amplifying device 51, the radio frequency signal power amplifying device 51 is used for carrying out power amplification on the designated signal, the radio frequency signal variable frequency demodulating device 52 is used for carrying out demodulation processing on the designated signal after power amplification, and the signal decoding output device 53 is used for carrying out decoding processing on the demodulated signal and outputting the signal after decoding processing to an external device.
In practice, the satellite receiving antenna 50 can receive weak signals forwarded by the satellite's transponder and remove noise as much as possible. The appointed signal sent by the satellite transponder reaches the ground and is received through an antenna surface, reflected and focused to a receiving port of a feed source and a tuner, the weak satellite transponder is amplified and converted by the tuner, the weak satellite transponder is output by an LNB (Low Noise Block), and the signal is sent to a satellite receiver through a radio frequency cable; the satellite receiver demodulates the satellite signal sent by the tuner, and outputs a video image signal and an accompanying sound signal after decoding.
Further, the signal decoding output device 53 comprises an output interface, and the output interface comprises any one or more of an 8K SDI interface, a 4-way 4K SDI interface, an HDMI2.1 interface, a 4-way 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 1-way single-way 8K SDI video signal, 1-way single-way 8K HDMI2.1 format video signal, 4-way 2SI 4K SDI video signal, 4-way SQD 4K SDI video signal, 4-way 2SI 4K HDMI 2.0 format video signal, and 4-way SQD 4K HDMI 2.0 format video signal.
The selection of the output interface of the specific signal decoding output device 53 is generally defined with reference to the interface format of the subsequent video-audio playing device or recording device. At present, a part of 8K televisions are provided with 4 paths of HDMI 2.0 format interfaces, a part of 8K televisions are provided with 1 path of HDMI 2.1 format interfaces (capable of transmitting 8K ultra high definition video signals), and a part of monitors are provided with 4 paths of 4K SDI video signal interfaces. And selecting a signal decoding output device output interface according to an interface mode of the using device. Of course, the video playing or recording device with the corresponding interface can also be selected according to the output interface mode (when the limitation exists) of the signal decoding output device.
Further, the external devices include one or more of 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.
It should be further noted that, as those skilled in the art clearly know, the ultra-high definition video signal or the ultra-high definition program signal contains not only video content but also audio content or audio content, so that the video signal, the ultra-high definition video signal, and the like mentioned in the present invention can be actually understood as an ultra-high definition video signal carrying both video information and audio information.
It should be further noted that, although the present invention and its embodiments are described in terms of technical content of the present invention, in many cases, 8K ultra-high definition video is used, and those skilled in the art will readily understand that the replacement of 8K ultra-high definition video with ultra-high definition video of other resolutions such as 10K, 12K or 16K may be implemented on the basis of the present invention without any creative effort. Therefore, the 8K ultra high definition video is not a technical limitation of the present invention, but is merely illustrative for the convenience of understanding by the user.
It should be noted that the above embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.
Claims (10)
1. A video rebroadcasting system, characterized in that the system comprises a coding device, a signal variable frequency modulation device, a signal power amplifying device and a satellite transmitting antenna;
The video signal source is connected with the coding device through an SDI cable or an optical fiber, the coding device is connected with the signal variable frequency modulation device, the signal variable frequency modulation device is connected with the signal power amplification device through a radio frequency cable, and the signal power amplification device is connected with the satellite transmitting antenna through 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 variable frequency 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 amplifying device is used for carrying out power amplification on the processed TS stream signal to obtain a power amplified 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 forwarding by a transponder on the satellite;
The ultra-high definition video signal is an 8K ultra-high definition video signal;
the coding equipment comprises a signal receiving device, a signal sampling device, a signal coding device and a code stream output device which are sequentially connected, wherein the signal sampling device in the coding equipment is used for coding and sampling 1 path of 8K super-high definition video into 4 paths of 4K super-high definition video in a 2SI mode or an SQD mode and reducing the signal data quantity required to be transmitted by a signal transmission interface;
the encoding device performs the encoding processing for the 4 paths of 4k video signals synchronously;
The encoding equipment also comprises a code stream multiplexing device, wherein the code stream multiplexing device is respectively connected with the signal encoding device and the code stream output device, and the code stream multiplexing device is used for multiplexing 4 paths of 4K ultra-high definition video TS stream signals into 1 path of TS stream signals.
2. The system of claim 1, wherein the video signal source comprises an ultra-high definition camera, an ultra-high definition rebroadcast vehicle, an ultra-high definition switching station, or an ultra-high definition player;
The ultra-high definition video camera, the ultra-high definition rebroadcast vehicle, the ultra-high definition switching station and the ultra-high definition player are all used for providing the ultra-high definition video signal.
3. The system of claim 1, wherein the manner in which the encoding device is coupled to the video source comprises any one of:
Connected through a 1-way 48G SDI interface cable;
connected through a 4-way 12G SDI interface cable;
Connected by 1-way optical fiber.
4. A system according to claim 3, wherein the encoding device is further configured to:
Sampling the 8K ultra-high definition video signal;
And carrying out compression coding on the sampled 8K ultra-high definition video signals, wherein the 8K ultra-high definition video TS stream signals generated after coding are 8K ultra-high definition video TS stream signals formed by 1 single-channel 8K video signals or 4K ultra-high definition video TS stream signals.
5. The system of claim 4, wherein 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 to 300mbps.
6. The system of claim 1, wherein the encoding device is connected to the signal variable frequency modulation device by an ASI interface cable or by an IP network cable.
7. A video receiving system, which is characterized by being used for processing signals transmitted by the video rebroadcasting system according to any one of claims 1-6, wherein the video receiving system comprises a satellite receiving antenna, a radio frequency signal power amplifying device, a radio frequency signal variable frequency demodulation device and a signal decoding output device which are connected in sequence;
The satellite receiving antenna is used for receiving the appointed signal forwarded by the satellite transponder and sending the appointed signal to the radio frequency signal power amplifying equipment;
the radio frequency signal power amplification device is used for amplifying the power of 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 the external device.
8. The video receiving system of claim 7, wherein the signal decoding output device comprises an output interface comprising any one or more of the following:
An SDI interface of 8K, an SDI interface of 4 paths of 4K, an HDMI2.1 interface, a4 paths of HDMI2.0 interface and an optical fiber interface.
9. The video receiving system of claim 8, wherein the signal output form of the signal decoding output device includes any one or more of:
1-channel single-channel 8K SDI video signal, 1-channel 8K HDMI2.1 format video signal, 4-channel 2SI 4K SDI video signal, 4-channel SQD 4K SDI video signal, 4-channel 2SI 4K HDMI 2.0 format video signal, and 4-channel SQD 4K HDMI 2.0 format video signal.
10. The video receiving system of claim 7, wherein the external device comprises one or more of an 8K hard disk 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, a 4K/8K signal analyzer.
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