CN115767000A - Method, device and system applied to air-to-ground audio and video conference - Google Patents
Method, device and system applied to air-to-ground audio and video conference Download PDFInfo
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Abstract
The invention discloses a method, a device and a system applied to an air-ground audio and video conference, wherein the method comprises the steps of responding to a request of an airborne terminal device and a ground terminal device for accessing a conference; completing authentication and verification of the airborne terminal equipment and the ground terminal equipment and starting a conference; monitoring the running state of each terminal device joining the conference in real time by adopting a heartbeat mechanism; receiving audio and video data sent by each terminal device joining the conference and carrying out verification and processing; the audio and video data sent by each terminal device adopt a unified audio and video data format; and sending the audio and video data subjected to the checksum processing to each terminal device joining the conference. The invention realizes the audio and video conference among the air-ground terminal devices and overcomes the application limitation of the existing universal conference system.
Description
Technical Field
The invention belongs to the technical field of aviation airborne technology and communication, and particularly relates to a method, a device and a system applied to an air-to-ground audio and video conference.
Background
In order to improve daily work efficiency and improve cooperative office capacity, the audio and video conference technology is widely applied to various fields in daily life and becomes an important means for information transmission and communication in various industries.
With the development of the air-ground interconnection communication technology, the communication cost of passengers is reduced, timely work communication and resource sharing are realized, and the requirements of air-ground audio and video conferences, cooperative office work and the like are continuously presented. However, since the aviation onboard electronic devices, the operating system and the application software all have strict airworthiness standards and requirements, and meanwhile, the airborne conference audio data needs to be docked with the cabin broadcasting intercom system, and the requirements are met with the audio format of ARINC628, the hardware and the operating system which are relied on by the current conference systems commonly used in the market, such as nails and flight communication, cannot meet the airworthiness standards and the requirements of the airborne conference audio format, and cannot be directly deployed on the aviation onboard electronic devices. Therefore, a need exists for an audio-video conferencing method and system that can be deployed on an airborne electronic product.
Disclosure of Invention
The invention provides a method, a device and a system applied to an air-ground audio and video conference, and aims to solve the problem that the existing universal conference system cannot be deployed on airborne electronic equipment because the existing universal conference system does not have the requirements of airworthiness standard and airborne conference audio format. The invention realizes the audio and video conference among the air-ground terminal devices and overcomes the application limitation of the existing universal conference system.
The invention is realized by the following technical scheme:
a method for application to air-to-ground audio-video conferencing, comprising:
responding to a request for accessing the airborne terminal equipment and the ground terminal equipment to the conference;
completing authentication and verification of the airborne terminal equipment and the ground terminal equipment and starting a conference;
monitoring the running state of each terminal device joining the conference in real time by adopting a heartbeat mechanism;
receiving audio and video data sent by each terminal device joining the conference and carrying out verification and processing; the audio and video data sent by each terminal device are in an audio and video data format meeting the aviation standard;
and sending the audio and video data subjected to the checksum processing to each terminal device joining the conference.
As a preferred embodiment, the authentication verification and heartbeat monitoring process of the present invention specifically includes the following steps:
receiving authentication information sent by each terminal device;
carrying out authentication check on the authentication message, feeding back an authentication result to each terminal device, adding the terminal device into the conference if the terminal device passes the authentication, and continuously receiving the authentication message sent by the next terminal device if the terminal device passes the authentication;
starting a conference;
monitoring the running state of each terminal device joining the conference by receiving the heartbeat signal, entering the next step if the communication is normal, and continuously receiving the authentication message sent by the next terminal device if the communication is normal;
and receiving the conference audio and video data of each terminal device, and verifying, processing and forwarding the conference audio and video data.
As a preferred embodiment, the video data processing and transmitting process of the present invention specifically includes the following steps:
receiving video data sent by each terminal device;
selecting a video speaker by a conference host;
and sending the video data of the selected video speaker to each terminal device, and ensuring that each terminal device displays the same speaker video.
As a preferred embodiment, the audio data processing and transmitting process of the present invention is specifically as follows:
receiving audio data sent by each terminal device;
after verifying and decoding the received audio data, converting the audio data into PCM audio data;
encoding the PCM audio data into audio data in ARINC 628P3 format;
mixing the audio data in the multiple paths of ARINC 628P3 formats into one path of audio data;
and sending the mixed audio data to each terminal device.
As a preferred embodiment, the invention adopts a multicast mode to send audio and video data to all airborne terminal equipment;
and sending the audio and video data to the ground terminal equipment in a unicast mode.
In a second aspect, the invention provides a device applied to an air-to-ground audio/video conference, which comprises an airborne server, wherein an airborne service module is deployed on the airborne server;
the onboard service module is configured to:
responding to a request of the airborne terminal equipment and the ground terminal equipment for accessing the conference;
completing authentication and verification of the airborne terminal equipment and the ground terminal equipment and starting a conference;
monitoring the running state of each terminal device joining the conference in real time by adopting a heartbeat mechanism;
receiving audio and video data sent by each terminal device joining the conference and carrying out verification and processing; the audio and video data sent by each terminal device are in an aviation standard audio and video data format;
and sending the audio and video data subjected to the checksum processing to each terminal device joining the conference.
As a preferred embodiment, the onboard service module of the present invention provides a unified communication protocol for accessing the conference system, and realizes the communication connection between the onboard server and the onboard terminal device and the ground terminal device through the unified communication protocol.
As a preferred embodiment, the onboard service module of the present invention defines a heartbeat message protocol for each terminal device accessing the conference system, and uses a heartbeat mechanism to monitor the operating state of each terminal device in real time, and receives and verifies audio and video data of each terminal device joining the conference system.
As a preferred embodiment, the onboard service module of the present invention defines an audio/video data format that meets the aviation standard for each terminal device accessing the conference system.
As a preferred embodiment, the onboard service module of the present invention provides a video conference host function, a conference host selects one video speaker, and sends video data of the selected speaker to each terminal device, thereby ensuring that each terminal device displays the same speaker video.
As a preferred embodiment, the onboard service module of the invention provides conference audio data in accordance with ARINC 628P3 format, and ensures that the conference audio data is directly played by a cabin broadcasting intercom system.
In a third aspect, the invention provides a system applied to an air-to-ground audio/video conference, which comprises the airborne server, an airborne terminal module and a ground terminal module;
the airborne terminal equipment with the airborne terminal module and the ground terminal equipment with the ground terminal module are connected to the airborne server by adopting a unified communication protocol provided by the airborne service module.
As a preferred embodiment, the airborne terminal module and the airborne service module of the invention have airborne software airworthiness standards, and the airborne terminal module can be deployed on any terminal display device in the passenger cabin, which meets the airworthiness standards;
the onboard terminal module is an onboard client software module of the system and provides functional interfaces for establishing a conference, joining the conference, quitting the conference, muting and forbidding videos; audio and video processing capabilities are provided.
As a preferred embodiment, the onboard terminal module of the present invention uses a communication interface provided by the onboard service module, accesses to the system through handshake authentication, and then communicates with the onboard server in real time through a heartbeat mechanism defined by the onboard service module.
As a preferred embodiment, after joining a conference, the onboard terminal module of the present invention starts to collect audio and video data of the terminal device, performs encoding and decoding processing, encapsulates the audio and video data into an audio and video data format defined by the onboard service module, and sends the audio and video data format to the onboard server.
As a preferred embodiment, the onboard terminal device and the onboard server are in the same local area network, and the onboard terminal module directly receives multicast audio and video data sent by the onboard service module, and after verification, the multicast audio and video data is played in the terminal device.
As a preferred embodiment, the ground terminal module of the present invention is a ground client software module of the system, and provides functional interfaces for creating a conference, joining a conference, exiting a conference, muting and prohibiting a video; audio and video processing capabilities are provided;
the ground terminal module is adaptive to various operating systems and hardware equipment and can be deployed on mobile electronic equipment or a computer which has no audio and video processing capability.
As a preferred embodiment, the ground terminal module of the present invention uses the communication interface provided by the onboard service module, accesses to the system through handshake authentication of the air-ground communication link, and then communicates with the onboard server in real time through the heartbeat mechanism defined by the onboard service module.
As a preferred embodiment, after joining a conference, the ground terminal module of the present invention collects audio and video data of the terminal device, performs encoding and decoding processing, encapsulates the audio and video data into an audio and video data format defined by the airborne service module, and sends the audio and video data format to the airborne server by using an air-to-ground communication link.
As a preferred embodiment, the ground terminal device and the airborne server are in different networks, the airborne server sends audio and video data to each ground terminal device in a unicast manner through the air-ground communication link, and the ground terminal device is played on the terminal device after the audio and video data pass verification.
The invention has the following advantages and beneficial effects:
the invention provides a technology applied to an air-ground audio and video conference, which responds to the request of an air terminal device and a ground terminal device for accessing the conference by providing a unified communication protocol for accessing a conference system and completes the authentication and verification of the air terminal device, thereby realizing the starting of the conference; the invention reduces the difference of the air-ground terminal equipment and lightens the processing burden of the server by providing the audio and video data format which accords with the aviation standard. Compared with the traditional audio and video conference system, the system does not have the airworthiness standard, so that the system cannot be deployed on airborne electronic equipment. The technology provided by the invention is based on airworthiness standard, and can be directly deployed on airborne electronic products.
The technology applied to the air-ground audio and video conference provided by the invention adopts coding operation to convert the conference audio data into the conference audio data conforming to ARINC 628P3 format, thereby ensuring that the conference audio data can be directly docked with a cabin broadcasting conversation system for playing.
Because the air-to-ground communication link is limited by bandwidth, a large amount of audio and video data needs to be transmitted in the traditional audio and video conference, and the air-to-ground bandwidth link cannot be met. The invention provides a video switching function based on the air-ground communication link and adapts the bandwidth limitation of the air-ground link.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention.
Fig. 2 is a flowchart of authentication verification and heartbeat monitoring according to an embodiment of the present invention.
Fig. 3 is a flow chart of video data processing and transmission according to an embodiment of the invention.
Fig. 4 is a flow chart of audio data processing and transmission according to an embodiment of the present invention.
FIG. 5 is a system architecture diagram of an embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating an interaction process between an on-board terminal module and an on-board service module according to an embodiment of the present invention.
Fig. 7 is a schematic diagram illustrating an interaction process between a ground terminal module and an airborne service module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limiting the present invention.
Examples
The existing universal conference system does not have the requirements of airworthiness standard and airborne conference audio format, so the existing universal conference system cannot be deployed on airborne electronic equipment. Based on the above, the embodiment provides a method applied to an air-to-ground audio/video conference, which is implemented based on an airborne server, wherein the airborne server provides a unified communication protocol for an accessed airborne terminal device and a ground terminal device; the method specifically comprises the following steps as shown in fig. 1:
step 2, completing authentication and verification of the airborne terminal equipment and the ground terminal equipment and starting a conference;
step 3, monitoring the running state of each terminal device joining the conference in real time by adopting a heartbeat mechanism;
step 4, receiving audio and video data sent by each terminal device joining the conference and carrying out verification and processing; the audio and video data sent by each terminal device are in an audio and video data format meeting the aviation standard;
and 5, sending the audio and video data subjected to the checksum processing to each terminal device joining the conference.
As an optional implementation manner, as shown in fig. 2, the authentication check and heartbeat monitoring process specifically includes the following steps:
and step 21, receiving the authentication message sent by each air-ground terminal device (namely the airborne terminal device and the ground terminal device).
Step 22, the authentication message is authenticated and checked, and the authentication result is fed back to each air terminal device, if one terminal device passes the authentication, the terminal device is added into the conference to enter step 23, otherwise, the step 21 is returned to continue receiving the authentication message sent by the next terminal device.
Step 23, the conference is started.
And 24, monitoring the running state of each terminal device joining the conference by receiving the heartbeat signal, and if the communication is normal, entering the step 25, otherwise, returning to the step 21.
And 25, receiving the conference audio and video data of each air-ground terminal device, and verifying, processing and forwarding the conference audio and video data.
As an alternative embodiment, the video data processing and sending process is specifically shown in fig. 3, and includes:
and 411, receiving the video data sent by each air terminal device.
At step 412, a video speaker is selected by the conference host.
Step 413, sending the video data of the selected video speaker to the air terminal device, and ensuring that each terminal device displays the same speaker video. The video data are sent to all terminal devices (namely airborne terminal devices) in the passenger cabin in a multicast mode, and the video data are sent to the ground terminal devices in a unicast mode.
As an alternative embodiment, the process of processing and sending audio data is specifically shown in fig. 4, and includes:
and step 421, receiving the audio data sent by each air terminal device.
Step 422, after the received audio data is checked, decoded, etc., it is converted into PCM audio data.
In step 423, the PCM audio data is encoded into audio data in ARINC 628P3 format.
Step 424, mix the audio data in multiple ARINC 628P3 formats into one audio data path.
And step 425, sending the mixed audio data to the air-ground terminal equipment. And sending the mixed path of data to all terminal equipment in the passenger cabin by adopting a multicast mode, and sending the mixed path of data to the ground terminal equipment by adopting a unicast mode.
The embodiment of the invention also provides a device applied to the air-ground audio and video conference, which comprises an airborne service module and is used for implementing the method flow. The airborne service module is an airborne server software module which provides a unified communication protocol for airborne terminal equipment and ground terminal equipment so that the airborne server is in communication connection with the airborne terminal equipment and the ground terminal equipment.
The embodiment of the invention also provides a system applied to the air-to-ground audio conference, which comprises an airborne service module, an airborne terminal module and a ground terminal module. The system comprises an airborne service module, an airborne terminal module, a ground terminal module and a ground server module, wherein the airborne service module is an airborne server software module, the airborne terminal module is an airborne terminal device (namely an airborne client) software module, and the ground terminal module is a ground terminal device (namely a ground client) software module. The airborne service module and the airborne terminal module have airborne software airworthiness standards, the airborne terminal equipment and the ground terminal equipment are connected to an airborne server by adopting a unified communication protocol provided by the airborne service module, and after the airborne service module is authenticated and checked, an air-ground audio and video conference is started, wherein the system architecture is shown in fig. 5.
The airborne service module is a processing center of the air-to-ground audio conference system and provides a uniform communication protocol for accessing the conference system; and the system is responsible for responding to requests of the airborne terminal equipment and the ground terminal equipment for accessing the conference, completing authentication and verification of the air and ground terminal equipment, starting air and ground audio and video conference services and the like.
After the airborne service module starts the air-ground audio and video conference, the airborne service module defines a heartbeat message protocol for each terminal device accessed to the conference system, and adopts a sub-heartbeat mechanism to monitor the running state of each terminal device in real time, and receives and checks audio and video data streams added to each terminal device of the conference system. In order to reduce the processing burden of the airborne server and shield the difference of the air-ground terminal equipment, the airborne service module defines an audio/video data format which accords with an ARINC 628P3 protocol for each terminal equipment which is accessed into the conference system.
The airborne service module provides a video switching function for adapting to air-ground communication links and broadband limitations. The airborne service module provides a video conference host function, a conference host selects one path of video speakers from all terminal equipment added into the conference system, and sends video data of the selected speakers to the open-air terminal equipment, so that all terminal equipment can display the same path of speaker video.
The airborne service module provides conference audio data streams conforming to ARINC 628P3 format, and ensures that the conference audio data streams can be directly docked with the cabin broadcasting intercom system for playing. The airborne service module receives conference audio data of each air-ground terminal device, restores the conference audio data into PCM audio data after checking, decoding and other operations, then codes the PCM audio data into audio data in an ARINC 628P3 format, finally mixes the audio data in the multi-path ARINC 628P3 format into one path of data, and sends the data to the air-ground terminal device.
The airborne terminal equipment and the airborne server are in the same local area network, the airborne service module issues audio and video data to all terminal display equipment (namely the airborne terminal equipment) in the passenger cabin in a multicast mode, the ground terminal equipment and the airborne server are in different networks, data interaction needs to pass through an air-ground physical communication link, and therefore the airborne service module and the ground terminal equipment send the audio and video data in a unicast mode.
The airborne terminal module provides functional interfaces for establishing a conference, joining the conference, exiting the conference, muting, prohibiting videos and the like, has audio and video processing capability, conforms to the airworthiness standard of airborne software, and can be deployed on any terminal display equipment which conforms to the airworthiness standard in a passenger cabin.
The airborne terminal module adopts a communication interface provided by the airborne service module, is accessed to the air-ground audio and video conference system through handshake authentication, and then is in real-time communication with the airborne server through a heartbeat mechanism defined by the airborne service module.
After the terminal equipment of the airborne terminal module joins the conference, the airborne terminal module collects audio and video data streams of the terminal equipment, and the audio and video data streams are encoded, decoded, packaged into an audio and video data format defined by the airborne service module and sent to the airborne server.
The airborne terminal equipment and the airborne server are in the same local area network, the airborne terminal module directly receives the multicast audio and video data stream issued by the airborne service module, and the multicast audio and video data stream is played at the terminal equipment after being checked. The interaction process of the on-board terminal module and the on-board service module is shown in fig. 6.
The ground terminal module provides the same functions as the airborne terminal module, is adaptive to various operating systems and hardware equipment, and can be deployed on mobile electronic equipment or a PC with audio and video processing capability.
The ground terminal module adopts a communication interface provided by the airborne service module, accesses to the air-ground audio and video conference system through the air-ground communication link handshake authentication, and then communicates with the airborne server in real time through a heartbeat mechanism defined by the airborne service module.
After the terminal equipment of the ground terminal module joins the conference, the audio and video data streams of the terminal equipment are collected, are subjected to coding and decoding processing, are packaged into an audio and video data format defined by the airborne service module, and are sent to the airborne server by adopting an air-ground communication link.
The ground terminal equipment and the airborne server are in different networks, the airborne server sends audio and video data streams to each ground terminal equipment in a unicast mode through the air-ground communication link, and the ground terminal equipment is played on the terminal after the audio and video data passes verification. The interaction process of the ground terminal module and the airborne service module is shown in figure 7.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (20)
1. A method applied to an air-to-ground audio and video conference is characterized by comprising the following steps:
responding to a request of the airborne terminal equipment and the ground terminal equipment for accessing the conference;
completing authentication and verification of the airborne terminal equipment and the ground terminal equipment and starting a conference;
monitoring the running state of each terminal device joining the conference in real time by adopting a heartbeat mechanism;
receiving audio and video data sent by each terminal device joining the conference and carrying out verification and processing; the audio and video data sent by each terminal device adopt an audio and video data format meeting the aviation standard;
and sending the audio and video data subjected to the checksum processing to each terminal device joining the conference.
2. The method applied to the air-to-ground audio/video conference according to claim 1, wherein the authentication verification and heartbeat monitoring processes are specifically as follows:
receiving authentication information sent by each terminal device;
carrying out authentication check on the authentication message, feeding back an authentication result to each terminal device, adding the terminal device into the conference if the terminal device passes the authentication, and continuously receiving the authentication message sent by the next terminal device if the terminal device passes the authentication;
starting a conference;
monitoring the running state of each terminal device joining the conference by receiving the heartbeat signal, entering the next step if the communication is normal, and continuing to receive the authentication message sent by the next terminal device if the communication is normal;
and receiving the conference audio and video data of each terminal device, and verifying, processing and forwarding the conference audio and video data.
3. The method for the air-to-ground audio and video conference according to claim 1, wherein the video data processing and transmitting process is as follows:
receiving video data sent by each terminal device;
selecting a video speaker by a conference host;
and sending the video data of the selected video speaker to each terminal device, and ensuring that each terminal device displays the same speaker video.
4. The method applied to the air-to-ground audio/video conference according to claim 1, wherein the audio data processing and sending process is specifically as follows:
receiving audio data sent by each terminal device;
after verifying and decoding the received audio data, converting the audio data into PCM audio data;
encoding the PCM audio data into audio data in ARINC 628P3 format;
mixing the audio data in the multiple ARINC 628P3 formats into one path of audio data;
and sending the mixed audio data to each terminal device.
5. The method applied to the air-to-ground audio/video conference according to any one of claims 1 to 4, characterized in that audio and video data are sent to all airborne terminal devices in a multicast manner;
and sending the audio and video data to the ground terminal equipment in a unicast mode.
6. The device applied to the air-to-ground audio and video conference is characterized by comprising an airborne server, wherein an airborne service module is deployed on the airborne server;
the onboard service module is configured to:
responding to a request for accessing the airborne terminal equipment and the ground terminal equipment to the conference;
completing authentication and verification of the airborne terminal equipment and the ground terminal equipment and starting a conference;
monitoring the running state of each terminal device joining the conference in real time by adopting a heartbeat mechanism;
receiving audio and video data sent by each terminal device joining the conference and carrying out verification and processing; the audio and video data sent by each terminal device are in an audio and video data format meeting the aviation standard;
and sending the audio and video data subjected to the checksum processing to each terminal device joining the conference.
7. The device applied to the air-to-ground audio and video conference according to claim 6, wherein the airborne service module provides a unified communication protocol for accessing a conference system, and the airborne server is in communication connection with airborne terminal equipment and ground terminal equipment through the unified communication protocol.
8. The device applied to the air-to-ground audio/video conference according to claim 6, wherein the airborne service module defines a heartbeat message protocol for each terminal device accessing the conference system, and adopts a heartbeat mechanism to monitor the operating state of each terminal device in real time, and receive and verify audio and video data of each terminal device accessing the conference system.
9. The device applied to the air-to-ground audio and video conference according to claim 6, wherein the airborne service module defines an audio and video data format meeting an aviation standard for each terminal device accessing the conference system.
10. The device applied to the air-to-ground audio and video conference as claimed in claim 6, wherein the airborne service module provides a video conference host function, a conference host selects one video speaker, and sends video data of the selected speaker to each terminal device, so that each terminal device is ensured to display the same speaker video.
11. The device applied to the air-to-ground audio and video conference is characterized in that the onboard service module provides conference audio data in accordance with an ARINC 628P3 format, so that the conference audio data can be directly played by a cabin broadcast conversation system.
12. A system for air-to-ground audio/video conferencing, comprising the airborne server, the airborne terminal module and the ground terminal module according to any one of claims 6 to 11;
the airborne terminal equipment with the airborne terminal module and the ground terminal equipment with the ground terminal module are connected to the airborne server by adopting a unified communication protocol provided by the airborne service module.
13. The system applied to the air-ground audio and video conference according to claim 12, wherein the onboard terminal module and the onboard service module have onboard software airworthiness standards, and the onboard terminal module can be deployed on any terminal display device in the passenger cabin, which meets the airworthiness standards;
the airborne terminal module is an airborne client software module of the system and provides functional interfaces for establishing a conference, joining the conference, quitting the conference, muting and forbidding videos; audio and video processing capabilities are provided.
14. The system of claim 13, wherein the airborne terminal module accesses the system through handshake authentication by using a communication interface provided by the airborne service module, and then communicates with the airborne server in real time through a heartbeat mechanism defined by the airborne service module.
15. The system applied to the air-to-ground audio and video conference according to claim 13, wherein the airborne terminal module starts to collect audio and video data of the terminal device after joining the conference, and the audio and video data are encoded, decoded, encapsulated into an audio and video data format defined by the airborne service module and sent to the airborne server.
16. The system according to claim 13, wherein the airborne terminal device and the airborne server are in the same lan, and the airborne terminal module directly receives the multicast audio and video data delivered by the airborne service module, and after verification, the multicast audio and video data is played by the terminal device.
17. The system of claim 12, wherein the ground terminal module is a ground client software module of the system, and provides functional interfaces for creating a conference, joining a conference, exiting a conference, muting and disabling video; the device has audio and video processing capacity;
the ground terminal module is adaptive to various operating systems and hardware equipment and can be deployed on mobile electronic equipment or a computer which has no audio and video processing capability.
18. The system of claim 17, wherein the ground terminal module accesses the system through handshake authentication of the air-to-ground communication link using the communication interface provided by the airborne service module, and then communicates with the airborne server in real time through a heartbeat mechanism defined by the airborne service module.
19. The system of claim 17, wherein the ground terminal module collects audio and video data of the terminal device after joining the conference, performs encoding and decoding processing, encapsulates the audio and video data into an audio and video data format defined by the airborne service module, and sends the audio and video data format to the airborne server through an air-to-ground communication link.
20. The system of claim 17, wherein the ground terminal devices and the airborne server are in different networks, the airborne server sends audio and video data to each ground terminal device in a unicast manner through the air-to-ground communication link, and the ground terminal devices play the audio and video data on the ground terminal devices after the audio and video data pass verification.
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