CN211266898U - Tally-based multi-channel high-definition video wireless transmission system - Google Patents
Tally-based multi-channel high-definition video wireless transmission system Download PDFInfo
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- CN211266898U CN211266898U CN202020380730.XU CN202020380730U CN211266898U CN 211266898 U CN211266898 U CN 211266898U CN 202020380730 U CN202020380730 U CN 202020380730U CN 211266898 U CN211266898 U CN 211266898U
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Abstract
The utility model discloses a multichannel high definition video wireless transmission system based on Tally, video emission terminal receives audio and video signal, carries out audio and video coding, channel coding and modulates into radio frequency signal and enlargies, sends for wireless video transmission basic station; the wireless video transmission base station restores the wireless video transmission base station into a plurality of paths of IP data streams, the streams are restored into a plurality of paths of SDI signals through a video-audio decoder, and finally the SDI signals are transmitted outwards; receiving the TTL level signal by the Tally signal conversion equipment, converting the TTL level signal into an IP data stream, outputting the IP data stream to the wireless video transmission base station, and sending the IP data stream to the video transmitting terminal; and changing the code stream rate output by the video-audio encoder when the received IP data stream is determined to be in a PGM state so as to realize the wireless transmission of the multi-channel live video signals. The utility model discloses can realize multichannel video wireless transmission, can realize deploying fast again.
Description
Technical Field
The utility model belongs to the technical field of live video technique and specifically relates to a multichannel high definition video wireless transmission system based on Tally is related to.
Background
With the rise of new media and 'people show' programs in recent years, new requirements are put forward for television program production, more and more wireless video transmission machine positions are needed to enrich the pictures of the programs and reduce the transmission cost in the shooting of a plurality of programs, some of the machines are remote machine positions, some of the machines are in quick movement, the change of program scenes is quick, the system can be required to be quickly built and deployed, the traditional microwave-based wireless transmission technology is difficult to realize, the building period is long, the equipment quantity is large, and the frequency selection and debugging are difficult.
Disclosure of Invention
The utility model discloses an overcome prior art not enough, provide a multichannel high definition video wireless transmission system based on Tally, can realize the multichannel live broadcast video wireless transmission who deploys fast.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the provided Tally-based multi-channel high-definition video wireless transmission system comprises a wireless video transmission base station, and Tally signal conversion equipment, a video transmitting terminal and a video and audio decoder which are connected with the wireless video transmission base station, wherein the Tally signal conversion equipment, the video transmitting terminal and the video and audio decoder are connected with the wireless video transmission base station
The video transmitting terminal receives video and audio signals, performs video and audio coding, channel coding and modulation to radio frequency signals, performs signal amplification, and then transmits the amplified radio frequency signals to the wireless video transmission base station;
the wireless video transmission base station receives a plurality of paths of wireless video signals through an uplink and restores the wireless video signals into a plurality of paths of IP data streams, and the IP data streams are restored into a plurality of paths of SDI signals through the video and audio decoder and finally are transmitted outwards;
the Tally signal conversion equipment receives Tally TTL level signals outwards, converts the Tally TTL level signals into IP data streams, outputs the IP data streams to the wireless video transmission base station and then sends the IP data streams to the video transmitting terminal;
and the video transmitting terminal determines that the received IP data stream is in a PGM state to change the code stream rate output by the video and audio encoder so as to realize wireless transmission of multi-channel live video signals.
The system also comprises a switching station, wherein the IP data stream is restored into a plurality of SDI signals through the video and audio decoder and is finally transmitted to the switching station; and the switching station monitors a plurality of pictures and selects one SDI signal to carry out PGM output.
The switching table selects one SDI signal to carry out PGM and outputs the PGM to the display screen.
After receiving the radio frequency signals, the wireless video transmission base station manages and coordinates a plurality of video transmitting terminals through a downlink.
The video transmitting terminal comprises a video and audio encoder, a CPE, a power supply battery and a transmitting antenna; the SDI signal is converted into a low-code-stream code by the video-audio encoder and is output to the CPE, the CPE codes and modulates the coded IP data stream by a channel, outputs a radio-frequency signal, amplifies the radio-frequency signal by a power amplification module, outputs the radio-frequency signal to the transmitting antenna, and finally sends the radio-frequency signal to the wireless video transmission base station through the transmitting antenna.
The video transmitting terminal is connected with the SDI video and audio signal transmitting terminal, and the video transmitting terminal is connected with the SDI video and audio signal transmitting terminal.
The Tally signal conversion equipment monitors each path of TTL level signals output by the switching platform and is matched with each video transmitting terminal, when the switching platform outputs one path of PGM signals, the Tally signal conversion equipment sets the TTL level signals higher than the path of TTL level signals, packs all data into IP data streams and sends the IP data streams to the video transmitting terminals, the video transmitting terminals analyze the IP data streams and judge whether the IP data streams are in a PGM state, if so, the video transmitting terminals send instructions to set the code stream rate of the video and audio encoder to be high code rate, otherwise, the video transmitting terminals send instructions to set the code stream rate of the video and audio encoder to be low code rate, and adjustment of the high code rate and the low code rate is achieved.
In order to solve the technical problem, the utility model also provides a multichannel live broadcast video wireless transmission method based on Tally signal, includes at least following step:
s1: the video transmitting terminal receives the video and audio signals, performs video and audio coding, channel coding and modulation to radio frequency signals, performs signal amplification, and then sends the amplified radio frequency signals to the wireless video transmission base station;
s2: the wireless video transmission base station receives a plurality of paths of wireless video signals through an uplink and restores the wireless video signals into a plurality of paths of IP data streams, and the IP data streams are restored into a plurality of paths of SDI signals through a video and audio decoder and finally are transmitted outwards;
s3: the Tally signal conversion equipment receives Tally TTL level signals outwards, converts the Tally TTL level signals into IP data streams, outputs the IP data streams to the wireless video transmission base station and then sends the IP data streams to the video transmitting terminal;
s4: and the video transmitting terminal determines that the received IP data stream is in a PGM state to change the code stream rate output by the video and audio encoder so as to realize wireless transmission of multi-channel live video signals.
After receiving the radio frequency signals, the wireless video transmission base station manages and coordinates a plurality of video transmitting terminals through a downlink.
The Tally signal conversion equipment monitors each path of TTL level signals output by the switching platform and is matched with each video transmitting terminal, when the switching platform outputs one path of PGM signals, the Tally signal conversion equipment sets the TTL level signals higher than the path of TTL level signals, packs all data into IP data streams and sends the IP data streams to the video transmitting terminals, the video transmitting terminals analyze the IP data streams and judge whether the IP data streams are in a PGM state, if so, the video transmitting terminals send instructions to set the code stream rate of the video and audio encoder to be high code rate, otherwise, the video transmitting terminals send instructions to set the code stream rate of the video and audio encoder to be low code rate, and therefore adjustment of high and low code rates is achieved.
Be different from prior art, adopt the utility model discloses possess following beneficial effect:
in the utility model, the video transmitting terminal receives video and audio signals, performs video and audio coding, channel coding and modulation to radio frequency signals, amplifies the signals and sends the signals to the wireless video transmission base station; the wireless video transmission base station restores the wireless video transmission base station into a plurality of paths of IP data streams, the IP data streams are restored into a plurality of paths of SDI signals through a video and audio decoder, and finally the SDI signals are transmitted outwards; the Tally signal conversion equipment receives Tally TTL level signals outwards, converts the Tally TTL level signals into IP data streams, outputs the IP data streams to the wireless video transmission base station and then sends the IP data streams to the video transmitting terminal; and the video transmitting terminal determines that the received IP data stream is in a PGM state, and changes the code stream rate output by the video and audio encoder so as to realize the wireless transmission of the multi-channel live video signals. The utility model discloses only need build one set of system fast and use a set of frequency to solve the problem of the wireless signal transmission of the wireless live broadcast video of multichannel, overcome the wireless transmission technique that the tradition used the microwave to equipment in large quantity, multiunit frequency requirement, build cycle length and debug shortcoming such as difficulty.
Drawings
Fig. 1 is a schematic block diagram of a multiple high-definition video wireless transmission system based on Tally in an embodiment of the present invention;
fig. 2 is a schematic block diagram of a video transmitting terminal according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of an embodiment of the present invention, in order to adjust the code stream rate, of a multiple-channel live video wireless transmission method based on Tally signals.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Firstly, the utility model discloses the principle based on Tally signal realization code stream rate adjustment as follows: the Tally signal conversion equipment monitors that each path of TTL level signal output by the switching platform is matched with each video transmitting terminal, when the switching platform outputs a PGM signal of a certain path, the TTL level signal of the path is set to be high, the TTL level signal is converted into a digital signal 1 through the Tally signal conversion equipment, other paths are set to be 0, all data are packaged and encapsulated into IP data flow to be sent to all radio frequency transmitting terminals, the radio frequency transmitting terminals analyze the IP data flow and judge whether the IP data flow is in a PGM state, if so, sending instructions to set the code stream rate of a video and audio encoder to be high code rate, and if not, the code stream rate is low code rate, so that the adjustment of the high code rate and the low code rate is realized. The method breaks through the barrier that the traditional system can only transmit the fixed 1-3 paths of high-definition code rate videos, realizes the transmission of more than 8 paths of live broadcast wireless video signals, is simple and easy, has high building speed, is quickly debugged, can greatly save the cost, better meets the requirements of television stations and new media new technologies, and has wide prospects.
It should be noted that, cpe (customer Premise equipment) herein is a customer premises equipment, and is actually a mobile signal access equipment that receives a mobile signal and converts the mobile signal into a wireless WIFI signal, and it is also a device that converts a high-speed 4G or 5G signal into a WIFI signal, and the number of mobile terminals capable of supporting simultaneous internet access is also large.
The PGM bus herein has a plurality of buttons, each button representing a different video input, which send each selected signal directly to the line input PGM bus, and a BLACK additional button on the head of the PGM bus of a plurality of switching stations for blacking the screen. PGM is known to those skilled in the art to refer to the final signal that is ultimately output to a television or network.
The switching station itself has the output of Tally, which is high and low level, and we can determine whether it is in PGM state by sampling the high and low level signals and converting them into digital 0 and 1 signals.
As shown in fig. 1, the utility model provides a direct broadcast video wireless transmission system's of multichannel concrete embodiment based on Tally signal realization code stream rate adjustment, its system comprises Tally signal conversion equipment, wireless video transmission basic station, video transmission terminal and audio and video decoder to collocation display screen, switching platform and camera use: the SDI video and audio signals of the camera are sent to a video transmitting terminal for video and audio coding, then the IP data stream is subjected to signal coding and debugging, and then signal amplification is carried out, and the signals are sent to a wireless video transmission base station through a transmitting antenna; the wireless video transmission base station receives multiple paths of wireless video signals through an uplink and restores the wireless video signals into multiple paths of IP data streams, and manages and coordinates a plurality of video transmitting terminals through a downlink; the multi-channel IP data flow restores multi-channel SDI signals to the switching station through the video and audio decoder; the switching platform monitors a plurality of pictures and selects a certain path of signal to carry out PGM output to the display screen; the Tally signal conversion equipment monitors Tally TTL level signals output by the switching station in real time to judge whether the current selected channel of video is subjected to PGM (Program bus, Program, bus is provided with a plurality of buttons, each button represents different video input, and the buttons directly send each channel of selected signals to the line input PGM bus) for output, converts the multiple channels of TTL level signals into IP data streams to be output to a wireless video transmission base station, and judges whether the channel of selected signals is in a PGM state or not through the reception of a video transmitting terminal, so that the code stream rate output by a video and audio encoder is changed, and the method for transmitting the multiple channels of live broadcast wireless video signals by a set of system is realized.
As shown in fig. 2, the video transmitting terminal of the embodiment of the present invention includes a video-audio encoder, a CPE, a power supply battery, and a transmitting antenna; the SDI signals shot by the cameras are coded through a video-audio coder, the advanced video compression standard H.265 is adopted to convert high-definition video pictures into codes with low code streams and output the codes to CPE, signals with different formats input by various cameras can be automatically identified, SDI embedded audio input is supported, and parameters such as the code stream rate, the resolution ratio and the like of output video streams can be set; and the CPE realizes the coding and modulation of the channel of the coded IP data stream, outputs a radio frequency signal, amplifies the radio frequency signal by a power amplification module and outputs the radio frequency signal to a transmitting antenna.
As shown in fig. 3, the implementation method for implementing code stream rate adjustment based on Tally signal of the embodiment of the present invention is as follows, the switching station outputs Tally TTL level signal to Tally signal conversion device, Tally signal conversion device implements matching of each path of signal with the address of each accessed video transmitting terminal, when the switching station outputs a certain path of PGM signal, the TTL level signal of this path is pulled high, the signal is converted into digital signal 1 by Tally signal conversion device, the other paths are set to 0, and all data are packaged into IP data stream to be transmitted to the wireless video transmission base station, the wireless video transmission base station converts the IP data stream into radio frequency signal to be transmitted to the radio frequency transmitting terminal through space, the radio frequency transmitting terminal receives the IP data stream and then analyzes, if the signal of this path is PGM signal, i.e. receives digital 1 and the corresponding terminal address, the code stream rate of the audio encoder is set to high code rate by sending command, otherwise, the code rate is low. The transmission of more than 8 paths of live broadcast wireless video signals on one set of communication system can be realized through the high-low code rate adjustment mode, and the barrier that the traditional system can only transmit 2-3 paths of fixed high-definition code rate videos is broken. The system realizes transmission of more than 8 paths of live broadcast wireless video signals, is simple, quick in construction speed and quick in debugging, can greatly save cost, better meets the requirements of television stations and new media new technologies, and has wide prospects.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (7)
1. A Tally-based multi-channel high-definition video wireless transmission system is characterized by comprising a wireless video transmission base station, and a Tally signal conversion device, a video transmitting terminal and a video and audio decoder which are connected with the wireless video transmission base station, wherein the Tally signal conversion device, the video transmitting terminal and the video and audio decoder are connected with the wireless video transmission base station
The video transmitting terminal receives video and audio signals, performs video and audio coding, channel coding and modulation to radio frequency signals, performs signal amplification, and then transmits the amplified radio frequency signals to the wireless video transmission base station;
the wireless video transmission base station receives a plurality of paths of wireless video signals through an uplink and restores the wireless video signals into a plurality of paths of IP data streams, and the IP data streams are restored into a plurality of paths of SDI signals through the video and audio decoder and finally are transmitted outwards;
the Tally signal conversion equipment receives Tally TTL level signals outwards, converts the Tally TTL level signals into IP data streams, outputs the IP data streams to the wireless video transmission base station and then sends the IP data streams to the video transmitting terminal;
and the video transmitting terminal determines that the received IP data stream is in a PGM state, and changes the code stream rate output by the video and audio encoder so as to realize wireless transmission of multi-channel live video signals.
2. The Tally-based multi-channel high-definition video wireless transmission system as claimed in claim 1, further comprising a switching station, wherein the IP data stream passes through the video-audio decoder to recover multi-channel SDI signals, and is finally transmitted to the switching station; and the switching station monitors a plurality of pictures and selects one SDI signal to carry out PGM output.
3. The Tally-based multi-channel high-definition video wireless transmission system according to claim 2, further comprising a display screen, wherein the switching station selects one of the SDI signals for PGM output to the display screen.
4. The Tally-based multi-channel high-definition video wireless transmission system as claimed in claim 1, wherein the wireless video transmission base station manages and coordinates a plurality of video transmitting terminals through a downlink after receiving radio frequency signals.
5. The Tally-based multi-channel high-definition video wireless transmission system according to any claim 1 to 4, wherein the video transmitting terminal comprises a video-audio encoder, a CPE, a power supply battery and a transmitting antenna; the SDI signal is converted into a low-code-stream code by the video-audio encoder and is output to the CPE, the CPE codes and modulates the coded IP data stream by a channel, outputs a radio-frequency signal, amplifies the radio-frequency signal by a power amplification module, outputs the radio-frequency signal to the transmitting antenna, and finally sends the radio-frequency signal to the wireless video transmission base station through the transmitting antenna.
6. The Tally-based multi-channel high-definition video wireless transmission system according to any claim 1 to 4, further comprising a camera connected with the video transmitting terminal to send SDI audio and video signals to the video transmitting terminal.
7. The Tally-based multi-channel high-definition video wireless transmission system according to claim 2 or 3, wherein the Tally signal conversion device monitors each TTL level signal output by the switching station and matches each video transmitting terminal, when the switching station outputs one PGM signal, the Tally signal conversion device sets the TTL level signal higher than the TTL level signal, packages all data into IP data stream and transmits the IP data stream to the video transmitting terminal, the video transmitting terminal analyzes the IP data stream and judges whether the IP data stream is in the PGM state, if so, the video transmitting terminal sends an instruction to set the code stream rate of the video and audio encoder to a high code rate, otherwise, the video transmitting terminal sends an instruction to set the code stream rate of the video and audio encoder to a low code rate, so as to adjust the high and low code rates.
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| CN113452644A (en) * | 2020-03-24 | 2021-09-28 | 福州市博讯网络科技有限公司 | Tally-based multi-channel high-definition video wireless transmission system and method |
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| CN113452644A (en) * | 2020-03-24 | 2021-09-28 | 福州市博讯网络科技有限公司 | Tally-based multi-channel high-definition video wireless transmission system and method |
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