WO2012041117A1

WO2012041117A1 - Method, system and related device for centralized monitoring of video conference terminal

Info

Publication number: WO2012041117A1
Application number: PCT/CN2011/077639
Authority: WO
Inventors: 吴永明; 薛尧舜
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-09-30
Filing date: 2011-07-26
Publication date: 2012-04-05
Also published as: CN102447875A

Abstract

Disclosed are a method, system and related device for centralized monitoring of video conference terminal. The method of the present invention comprises: an audio-video media transmission channel is established between a monitoring center server and a terminal; the terminal compresses and encapsulates the collected audio-video signal and sends the signal to the monitoring center server; the monitoring center server de-encapsulates, de-compresses and synthesizes the received audio-video signal, and outputs the audio-video signal via peripheral equipment. The embodiment of the present invention enables the video conference administrator to simultaneously monitor the working status of multiple terminals, conveniently remote control the terminals, and promptly take support measures for faulty terminals, thus improving the work efficiency of the video conference administrator and the support capability of video conference operations and reducing operating cost.

Description

Method and system for centralized monitoring of video conference terminal and related device

The present invention relates to the field of video conferencing services, and in particular, to a method and system for centralized monitoring of video conferencing terminals and related devices. Background technique

The video conferencing system is a multimedia communication system that supports audio and video transmission. It enables individuals or groups in two or more different places to transmit voice, video and file data to each other through the transmission network and multimedia devices. Interactive communication.

The video conference system includes: a video conference terminal, a multipoint control unit (MCU), and a transmission network; the video conference terminal (hereinafter referred to as a terminal) includes a codec for implementing compression coding of audio, video, and the like media. And decoding processing; the terminal can be connected to peripherals such as microphone, camera, display, audio, etc. to complete audio and video input and output; the user can conveniently monitor and remotely operate the terminal through the PC console, and through the terminal man-machine The interactive input interface inputs instructions and information to the terminal, and the terminal provides terminal status information to the user through the human-machine interaction output interface.

The MCU can provide users with connection services for group meetings and multiple groups of conferences. The terminal participating in the multipoint conference establishes a connection with the MCU through the transmission network, and the MCU completes the exchange and mixing of the audio and video streams between the multiple terminals; for the audio media stream, the MCU sends the multi-party mixing processing for each terminal. For the video media stream, the MCU sends a single-picture video stream of another terminal for each terminal. If the MCU supports the multi-picture function, the video from multiple terminals can be combined into one multi-picture image and sent to the terminal.

In the prior art, conference management personnel can only monitor one terminal at the same time. FIG. 1 is a schematic diagram of a conventional video conference system, and FIG. 1 includes two locations, each location A plurality of terminals are installed, and the PC console separately monitors audio and video signals for each terminal through the IP network, but the PC console can only manage a single terminal at the same time, and cannot manage multiple terminals at the same time, however, The popularity of video conferencing applications, the increasing number of terminals deployed in enterprises or organizations, and the geographical distribution of physical locations are also increasingly dispersed, for example: on different floors of the same building, or between different buildings, if meeting management personnel at the same time Only the monitoring of the working status of one terminal can be implemented, which is not conducive to the protection and maintenance of multiple terminals, and increases the operating cost of the enterprise. Summary of the invention

In view of this, the main purpose of the present invention is to provide a method and system for centralized monitoring of a video conference terminal and related devices, so that the conference management personnel can simultaneously monitor the working status of multiple terminals, facilitate remote control of the terminal, and reduce the enterprise's Operating costs.

In order to solve the above technical problem, the technical solution of the present invention is implemented as follows:

A method for centralized monitoring of a video conference terminal, comprising: a monitoring center server and a terminal establish an audio and video media transmission channel; the terminal compresses and encodes the collected audio and video signals, and sends the signal to the monitoring center server; The server unpacks, decodes, and synthesizes the received audio and video signals, and outputs audio and video signals through the peripherals.

In the above solution, the audio and video media transmission channel is established to: determine media transmission channel parameters by means of pre-agreed or dynamic signaling negotiation, and establish one or more audio and video media transmission channels.

In the above solution, the encoding and encapsulation format of the audio and video signal in the terminal is determined by: the terminal and the monitoring center server determine the coding that the two parties wish to use by exchanging information in the signaling channel or by pre-configuring. Format, package format.

In the above solution, when the format of the collected audio and video signal does not meet the requirements of the specified encoding format, the method further includes: transforming the format of the signal during the compression encoding process; and transforming the video signal into: reducing the video Frame resolution, reduced frame rate processing; for audio The signal transformation process is: reducing the sampling rate and reducing the quantization precision processing.

In the above solution, the monitoring center server synthesizes the received audio signal into: mixing a plurality of audio signals, or performing a splicing process according to a certain rule, and playing the same through the audio device; The composite video signal is synthesized by combining a plurality of video signals into one multi-picture signal and playing them through a display device, or outputting each video signal to a display device.

The present invention also provides a system for centralized monitoring of a video conference terminal, including: one or more terminals, and a monitoring center server;

The terminal is configured to collect audio and video signals, and perform compression coding and encapsulation processing on the collected audio and video signals, and then send the signals to the monitoring center server;

The monitoring center server is configured to receive audio and video signals sent by the terminal, and perform demolition, encapsulation, decoding, and synthesis processing on the received audio and video signals, and output audio and video signals through the peripheral devices.

In the above solution, the terminal includes a monitoring front-end module; wherein, the monitoring front-end module includes: a monitoring audio encoding module, a monitoring video encoding module, and a monitoring network transceiver module; wherein, the monitoring audio encoding module is configured to perform audio signals on the terminal Compressed coding, and encapsulated and sent to the monitoring network transceiver module;

The monitoring video encoding module is configured to compress and encode the video signal of the terminal, and then package and send the signal to the monitoring network transceiver module;

The monitoring network transceiver module is configured to separately send the processed audio signal and the video signal to the monitoring center server.

In the above solution, the monitoring center server includes: a network transceiver module, an audio decoding module, an audio output module, a video decoding module, and a video output module;

a network transceiver module, configured to receive an audio and video signal sent by the terminal, and respectively send the audio signal to the audio decoding module, and send the video signal to the video decoding module;

An audio decoding module, configured to remove an audio signal and decode it, and then send the audio signal to the audio output Module

An audio output module, configured to synthesize and process the decoded audio signal, and play the same through the peripheral; the video decoding module is configured to remove the packaged video signal, and decode the signal to send to the video output module;

The video output module is configured to synthesize the decoded video signal and play it through the peripheral device. In the foregoing solution, the monitoring front-end module and the monitoring center server respectively include a monitoring signaling processing module, configured to determine media transmission channel parameters of both parties by means of agreement or dynamic signaling negotiation, and establish one or more audio and video media transmissions. aisle.

In the foregoing solution, the monitoring signaling processing module is further configured to determine, by using a manner of exchanging information in the signaling channel, or by a pre-configured manner, an encoding format and an encapsulation format that the monitoring front-end module and the monitoring center server desire to use.

In the above solution, the monitoring center server includes: one or more monitoring processing boards, configured to perform demolition, decoding, synthesizing, processing, and processing of audio and/or video of one channel of audio and/or one channel of video signals. The signal is played through the corresponding peripheral.

In the above solution, the monitoring and processing board is further configured to determine media transmission channel parameters of the monitoring front-end module and the monitoring processing board by means of a convention or dynamic signaling negotiation, and establish an audio and video media transmission channel; The manner in which the information is exchanged in the signaling channel, or the encoding format and the encapsulation format that the monitoring front-end module and the monitoring processing board wish to use are determined in a pre-configured manner.

The present invention also provides a video conferencing terminal, including a monitoring front-end module; wherein, the monitoring front-end module includes: a monitoring audio encoding module, a monitoring video encoding module, a monitoring network transceiver module, and a monitoring signaling processing module;

The monitoring audio encoding module is configured to compress and encode the audio signal of the terminal, and then package and send the signal to the monitoring network transceiver module;

a monitoring video encoding module, configured to compress and encode a video signal of the terminal, and encapsulate the video signal Send to the monitoring network transceiver module;

a monitoring network transceiver module, configured to separately send the processed audio signal and the video signal to the monitoring center server;

The monitoring signaling processing module is configured to determine media transmission channel parameters of the terminal and the monitoring center server by means of a contract or dynamic signaling negotiation, and establish one or more audio and video media transmission channels.

The present invention also provides a monitoring center server, including: a network transceiver module, an audio decoding module, an audio output module, a video decoding module, a video output module, and a monitoring signaling processing module;

An audio decoding module, configured to remove and package the audio signal, and decode the signal to send to the audio output module;

a video output module, configured to synthesize and process the decoded video signal, and play the same through the peripheral device; the monitoring signaling processing module is configured to determine a media transmission channel parameter of the terminal and the monitoring center server by using a convention or a dynamic signaling negotiation manner, Establish one or more audio and video media transmission channels.

The present invention provides a method and system for centralized monitoring of a video conference terminal and related devices. In the method of the present invention, the monitoring center server establishes an audio and video media transmission channel with the terminal; the terminal compresses the collected audio and video signals. Encoding and encapsulation processing, and sent to the monitoring center server; the monitoring center server de-encapsulates, decodes, synthesizes the received audio and video signals, and outputs audio and video signals through the peripherals. Using the solution of the present invention, enabling video The conference management personnel simultaneously monitors the working status of multiple terminals, facilitates remote control of the terminal, and timely obtains safeguard measures for the failed terminal, improving the working efficiency of the video conference management personnel and the guarantee capability of the video conference service. And reduce the operating costs of the enterprise. DRAWINGS

1 is a schematic structural diagram of a prior art video conference system;

2 is a schematic structural diagram of a system for centralized monitoring of a video conference terminal according to the present invention; FIG. 3 is a schematic flowchart of a method for centralized monitoring of a video conference terminal according to the present invention;

4 is a schematic diagram showing the internal structure of a video conference terminal according to the present invention;

FIG. 5 is a schematic diagram showing the internal structure of a monitoring center server according to the present invention; FIG.

FIG. 6 is a schematic structural diagram of a system for monitoring a video conference terminal in a centralized monitoring system when the monitoring center server uses the frame structure. detailed description

The basic idea of the present invention is: the monitoring center server and the terminal establish an audio and video media transmission channel; the terminal compresses and encodes the collected audio and video signals, and sends them to the monitoring center server; the monitoring center server receives the received sound The video signal is unpacked, decoded, synthesized, and the audio and video signals are output through the peripheral.

The present invention provides a system for centralized monitoring of a video conference terminal. As shown in FIG. 2, the system includes: one or more terminals and one monitoring center server; wherein, the terminal communicates with the monitoring center server through an IP network.

Based on the above system, the method for centralized monitoring of a video conference terminal provided by the present invention, as shown in FIG. 3, includes the following steps:

Step 301: The monitoring center server establishes an audio and video media transmission channel with the terminal.

In this step, the monitoring center server and the terminal may establish one or more audio and video media transmission channels by pre-arranging media transmission channel parameters or dynamic signaling negotiation manner; The signaling can be used but is not limited to Real Time Streaming Protocol (RTSP); the media transmission channel can be used but is not limited to Transmission Control Protocol (TCP) or User Data Packet Protocol (UDP). User Datagram Protocol ) channel.

When using RTSP to establish an audio media transmission channel, refer to the following process: Step la: The monitoring center server initiates a TCP connection request to the terminal, and the connection is used to deliver the RTSP message;

Step lb: The monitoring center server sends an RTSP establishment (SETUP) message to inform the terminal about the transport layer protocol and address information established by the monitoring center server;

Step lc: The terminal sends a response (SETUP RESPONSE) message, and the two channels establish a negotiation to complete;

Step Id: The monitoring center server sends an RTSP start (PLAY) message, requesting the terminal to start sending the local audio media stream;

Step le: After receiving the PLAY message, the terminal sends the local audio media stream to the monitoring center server.

In the following, other media streaming channels can be established in a similar manner, such as: a remote audio media stream, a local video media stream, and a remote video media stream.

Step 302: The terminal performs compression coding and encapsulation processing on the collected audio and video signals, and sends the audio and video signals to the monitoring center server.

In this step, the terminal first collects the audio and video signals, and performs compression coding on the collected audio and video signals; the audio and video signals collected by the terminal include: the local audio signal, the far-end audio signal, and the local video. Signal, remote video signal; Here, the terminal and the monitoring center server can determine parameters such as an encoding format and an encapsulation format that both parties wish to use by exchanging information in the signaling channel or by pre-configuring. Preferably, when the terminal performs compression coding on the audio signal, G.711, G.722 or other encoding algorithms may be used, and the terminal compresses the video signal. When the encoding process is used, H.263, H.264 or other encoding algorithms may be used; if the format of the collected audio and video signals does not meet the requirements of the specified encoding format, the format of the signal needs to be performed in the compression encoding process. Transform processing, for example: For video signals, it is necessary to reduce the resolution of the video frame, reduce the frame rate, etc. For audio signals, it is necessary to reduce the sampling rate, reduce the quantization accuracy, etc.; in general, in order to reduce bandwidth consumption and calculation For the video signal, the common intermediate format (CIF, Common Intermediate Format) frame size can be used, and the frame rate can be used for about 15 frames.

Secondly, the terminal encapsulates the compressed audio and video signal and sends it to the monitoring center server through the media transmission channel; wherein the encapsulation format can be used but is not limited to Real Time Protocol (RTP); Each media signal is encapsulated into an RTP stream, and multiple media signals can also be encapsulated into one RTP stream, for example: the local audio and local video signals are encapsulated into one RTP stream, and the far-end audio and the far-end video signal are encapsulated as An RTP stream.

Step 303: The monitoring center server performs demolition, encapsulation, decoding, and synthesis processing on the received audio and video signals, and outputs audio and video signals through the peripheral devices.

In this step, the monitoring center server removes the packaged audio and video signals and decodes and synthesizes them, and then outputs audio and video signals through peripherals such as a display and a speaker; wherein, the synthesis processing of the audio signals may be: The audio signal is mixed, or spliced according to a certain rule, and played by the audio device; for the synthesis of the video signal, the video signal can be synthesized into a multi-picture signal and played through a display device, or Each video signal is output to a display device.

The system for centralized monitoring of a video conference terminal provided by the present invention, as shown in FIG. 2, includes: one or more terminals, and one monitoring center server;

The terminal is configured to collect audio and video signals, and perform compression coding and encapsulation processing on the collected audio and video signals, and then send the signals to the monitoring center server; The monitoring center server is configured to receive audio and video signals sent by the terminal, and perform demolition, encapsulation, decoding, and synthesis processing on the received audio and video signals, and output audio and video signals through the peripheral devices.

As shown in FIG. 4, the terminal includes: an audio input module, an audio output module, an audio encoding module, an audio decoding module, a video input module, a video output module, a video encoding module, a video decoding module, and a signal transceiving module, and further includes : Monitoring front-end modules;

The monitoring front end module is configured to perform compression coding and encapsulation processing on the audio signal and the video signal of the terminal, respectively, and send the processed audio and video signals to the monitoring center server.

The monitoring front-end module includes: a monitoring audio encoding module, a monitoring video encoding module, and a monitoring network transceiver module;

The monitoring network transceiver module is configured to separately send the processed audio signal and the video signal to the network transceiver module of the monitoring center server.

As shown in FIG. 5, the monitoring center server includes: a network transceiver module, an audio decoding module, an audio output module, a video decoding module, and a video output module;

a network transceiver module, configured to receive an audio and video signal sent by the monitoring front end module, and respectively send the audio signal to the audio decoding module, and send the video signal to the video decoding module;

The video output module is configured to synthesize the decoded video signal and play it through the peripheral device. The monitoring front-end module and the monitoring center server respectively include a monitoring signaling processing module, and the monitoring signaling processing module determines the media transmission channel parameters by establishing a dynamic transmission channel negotiation manner between the monitoring front-end module and the monitoring center server. One or more audio and video media transmission channels; the signaling may be used but not limited to RTSP; the media transmission channel may be used but not limited to a TCP or UDP channel.

The monitoring signaling processing module is further configured to determine, by using a manner of exchanging information in the signaling channel, or by using a pre-configured manner, parameters such as an encoding format and an encapsulation format that the monitoring front-end module and the monitoring center server desire to use. Preferably, when the monitoring front-end module compresses and encodes the audio signal, G.711, G.722 or other encoding algorithms may be used, and when the front-end module performs compression encoding processing on the video signal, H.263 may be used. H.264 or other encoding algorithm.

The monitoring center server includes: one or more monitoring processing boards, as shown in FIG. 6;

The monitoring processing board is configured to remove, package, decode, and synthesize one channel of audio and/or one channel of video signals, and play the processed audio and/or video signals through corresponding peripherals.

The monitoring processing board is further configured to determine media transmission channel parameters of the monitoring front-end module and the monitoring processing board by means of a convention or dynamic signaling negotiation, and establish an audio and video media transmission channel; and pass through the signaling channel. The encoding format and the encapsulation format that the monitoring front-end module and the monitoring processing board hope to use are determined in a manner of exchanging information or in a pre-configured manner.

In the internal structure diagram of the terminal shown in FIG. 4, the signal transmission relationship between the modules in the terminal is: in the direction in which the signal is sent: the audio input module 1 collects the audio of the local end, such as the input of a peripheral such as a microphone, and The collected audio signal is copied into two copies, and one copy is sent to the audio encoding module 2 for compression encoding, and then sent to the opposite end by the signal transceiving module 3, and the other is sent to the monitoring front end module, and the monitoring in the front end module is monitored. The audio encoding module 10 compresses and encodes the input audio, and then sends it to the monitoring center server through the monitoring network transceiver module 12; the video input module 6 collects the video of the local end, such as the input of peripherals such as a camera, and collects the collected The video signal is copied into two copies, one is sent to the video encoding module 7 for compression encoding, and then sent by the signal transceiving module 3 to the opposite end, and the other is sent to the monitoring front end module, and the monitoring video encoding module 11 in the monitoring front end module is The input video is compression encoded and encapsulated, and then sent to the monitoring center server through the monitoring network transceiver module 12.

In the receiving direction of the signal: the signal transceiver module 3 receives the audio signal of the opposite end, and after removing the package of the network transmission layer, sends the valid signal to the audio decoding module 5, and the audio decoding module 5 sends the decoded signal to the audio output module 4, The audio output module 4 copies the audio signal into two copies, one output to the peripherals such as the speaker for playing, and the other to the monitoring front end module, and the monitoring audio encoding module 10 of the monitoring front end module compresses and encodes the input audio. Then, the monitoring network transceiver module 12 sends the signal to the monitoring center server; the network transceiver module 3 receives the video signal of the opposite end, removes the encapsulation of the network transmission layer, and sends a valid signal to the video decoding module 9, and the video decoding module 9 decodes the decoded data. The video output module 8 sends the data to two copies, one output is sent to the peripherals such as the display for playback, and the other is sent to the monitoring front-end module, and the monitoring video encoding module 11 of the front-end module monitors the input video. Compressed and encapsulated, then sent and received through the monitoring network Block 12 transmits to the monitoring center server.

In the internal structure diagram of the monitoring center server shown in FIG. 5, the transmission relationship between the signals of each module in the monitoring center server is: The network transceiver module 1 receives the audio and video signals sent by the monitoring front-end modules of each terminal, respectively, and the audio The signal is transmitted to the audio decoding module 2, and the video signal is transmitted to the video decoding module 3. The audio decoding module 2 unpacks and decodes the audio signal, and then transmits the audio signal to the audio output module 4, and the audio output module 4 pairs the plurality of monitoring front-end modules. The audio signal is synthesized and played by a peripheral device such as a speaker; the synthesized processing of the audio signal may be: mixing the local audio and the far end audio sent by a monitoring front end module, or using a roulette wheel The audio signal segment splicing process of each monitoring front-end module is selected by the rotation mode; the video decoding module 3 de-encapsulates and decodes the video signal, and then transmits the video signal to the video output module 5, and the video output module 5 performs video signals from the plurality of monitoring front-end modules. Synthesis Processing, and playing through a peripheral device such as a display; the video signal synthesis processing may be: combining the local video and the far-end video sent by the multiple monitoring front-end modules into one multi-picture video, and playing through a display device, Or output each video signal to a display device separately.

The monitoring center server of the present invention can also be implemented by using a hardware device of a chassis-type structure. As shown in FIG. 6, in the structure shown in FIG. 6, one or more monitoring processing boards are inserted in the monitoring center server, and Each monitoring and processing board is respectively connected to one terminal and one peripheral such as a monitor; each monitoring and processing board is responsible for performing demodulation, decoding, synthesizing, etc. on one audio and/or one video signal, and The processed audio and/or video signals are played through the corresponding peripherals; each monitoring processing board can use the structure shown in FIG. 5, and the functions between the modules are not described again; Internally, the power supply status of each monitoring board can be configured uniformly or separately.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included. Within the scope of protection of the present invention. Industrial applicability

The invention provides a method and system for centralized monitoring of a video conference terminal and related devices, and the basic idea is: the monitoring center server and the terminal establish an audio and video media transmission channel; the terminal compresses and encodes the collected audio and video signals and Encapsulation processing, and sent to the monitoring center server; the monitoring center server removes the encapsulation, decoding, and synthesis processing of the received audio and video signals, and outputs audio and video signals through the peripherals.

The solution of the present invention enables the video conference management personnel to monitor the working status of multiple terminals at the same time, facilitates remote control of the terminal, and timely obtains safeguard measures for the faulty terminal, thereby improving the video conference management personnel. The efficiency of the work and the support of the video conferencing service, and reduce the operating costs of the enterprise.

Claims

Claim

A method for centralized monitoring of a video conference terminal, comprising: a monitoring center server and a terminal establishing an audio and video media transmission channel;

The terminal compresses and encodes the collected audio and video signals and sends them to the monitoring center server;

The monitoring center server unpacks, decodes, and synthesizes the received audio and video signals, and outputs audio and video signals through the peripherals.

The method according to claim 1, wherein the audio and video media transmission channel is established as: determining media transmission channel parameters by means of pre-agreed or dynamic signaling negotiation, and establishing one or more audio and video media Transmission channel.

3. The method according to claim 1, wherein the encoding and encapsulation format of the audio and video signals in the terminal are determined by: a manner in which the terminal and the monitoring center server exchange information in the signaling channel, or The pre-configured way determines the encoding format and encapsulation format that both parties wish to use.

The method according to claim 3, wherein when the format of the collected audio and video signals does not meet the requirements of the specified encoding format, the method further comprises: transforming the format of the signal during the compression encoding process The conversion processing for the video signal is: reducing the video frame resolution and reducing the frame rate processing; the conversion processing for the audio signal is: reducing the sampling rate and reducing the quantization precision processing.

The method according to any one of claims 1 to 4, wherein the monitoring process of the received audio signal by the monitoring center server is: mixing a plurality of audio signals, or according to a certain rule Splicing processing, and playing through the audio device; the monitoring center server synthesizes the received video signal into: combining a plurality of video signals into one multi-picture signal, and playing through a display device, or each video signal Output to a display device separately.

6. A system for centralized monitoring of a video conference terminal, characterized in that: More than one terminal, and a monitoring center server;

The system according to claim 6, wherein the terminal comprises a monitoring front end module; wherein, the monitoring front end module comprises: a monitoring audio encoding module, a monitoring video encoding module, and a monitoring network transceiver module;

The system according to claim 6, wherein the monitoring center server comprises: a network transceiver module, an audio decoding module, an audio output module, a video decoding module, and a video output module;

The video output module is configured to synthesize the decoded video signal and play it through the peripheral device.

The system according to claim 7 or 8, wherein the monitoring front end module and the monitoring center server further comprise a monitoring signaling processing module, respectively, configured to determine media of both parties by means of agreement or dynamic signaling negotiation. Transmit channel parameters to establish one or more audio and video media transmission channels.

The system according to claim 9, wherein the monitoring signaling processing module is further configured to determine a monitoring front-end module and a monitoring center server by exchanging information in a signaling channel or by a pre-configured manner. The encoding format and encapsulation format that you want to use.

The system according to any one of claims 6 to 10, wherein the monitoring center server comprises: one or more monitoring processing boards, configured to remove and package one channel of audio and/or one channel of video signals, Decoding, synthesizing, and playing the processed audio and/or video signals through the corresponding peripherals.

The system according to claim 11, wherein the monitoring processing board is further configured to determine media transmission channel parameters of the monitoring front-end module and the monitoring processing board by means of appointment or dynamic signaling negotiation. And establishing an audio and video media transmission channel; and determining, by using a manner of exchanging information in the signaling channel, or by using a pre-configured manner, the encoding format and the encapsulation format that the monitoring front-end module and the monitoring processing board hope to use.

A video conference terminal, comprising: a monitoring front-end module; wherein, the monitoring front-end module comprises: a monitoring audio encoding module, a monitoring video encoding module, a monitoring network transceiver module, and a monitoring signaling processing module;

a monitoring network transceiver module, configured to separately send the processed audio signal and the video signal to the monitoring center server; The monitoring signaling processing module is configured to determine media transmission channel parameters of the terminal and the monitoring center server by means of appointment or dynamic signaling negotiation, and establish one or more audio and video media transmission channels.

A monitoring center server, comprising: a network transceiver module, an audio decoding module, an audio output module, a video decoding module, a video output module, and a monitoring signaling processing module;