Audio mixing method in multiple-MCU video conference system

A video conferencing system and sound mixing technology, which is applied to video conferencing systems, two-way working systems, etc., can solve the problems of system unavailability, large audio delay, and high computational complexity, so as to avoid system unavailability and improve transmission delay. Effect

Inactive Publication Date: 2009-07-08
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

[0005] There are two main problems in the above cascading method and mixing method: (1) the audio delay is large
The computational complexity of the master MCU is greater than that of other slave MCUs, and when there is a problem with the master MCU (such as a crash), it will cause the entire system to be unavailable

Method used

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  • Audio mixing method in multiple-MCU video conference system
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  • Audio mixing method in multiple-MCU video conference system

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Embodiment Construction

[0019] (1) All MCUs are registered to the gatekeeper (GateKeeper, hereinafter referred to as GK), and each MCU establishes a pairwise connection with other MCUs, and each MCU maintains a list of connections with other MCUs and A list of local clients that need to be mixed, that is, two-to-two connections between MUCs are realized through GK.

[0020] like figure 1 As shown, the present invention does not distinguish between the master MCU and the slave MCU when the MCUs are cascaded, each MCU belongs to the same level, and two MCUs are connected to each other to form a mesh topology. Whether to establish a connection between MCUs and open a media channel is determined by GK dynamic scheduling.

[0021] For a certain client, the MCU directly connected to it is called a local MCU, and other MCUs connected to the local MCU become remote MCUs; for a certain MCU, the client directly connected to it is called a local client , and the clients indirectly connected to it through oth...

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Abstract

Mixing method in the multi-MCU video conferencing system: (1) all MCUs are registered on the gatekeeper (GateKeeper, hereinafter referred to as GK), each MCU and other MCUs are set up between two connections, and each The MCU maintains a connection list with other MCUs and a local client list that needs to be mixed; (2) The MCU linearly superimposes the audio data sent by the local client according to the local mixing client list, and After encoding, it is sent to each peer MCU; (3) the MCU subtracts the audio data of the client to be sent to the mixed result in step (2) and mixes each decoded audio data sent from the peer MCU, Finally encode and send the result to the target client. The invention can reduce the number of audio data transmission hops and avoid single-point failure of the main MCU under the same network conditions, and has higher reliability.

Description

field of invention [0001] The invention belongs to the field of computer network multimedia communication, and mainly relates to a method for forwarding and mixing audio data in a multi-point video conference in which a plurality of multi-point control units MCUs are cascaded. Background of the invention [0002] Video conferencing systems have been widely used in government departments, business, education, medical care and personal life. Real-time face-to-face video and audio communication not only facilitates people's lives, saves a lot of travel expenses, improves work efficiency, but also promotes the development of video conferencing related technologies. People have also put forward higher requirements for video conferencing systems. [0003] The multi-point control unit MCU is an important part of the video conference based on the H.323 standard. As people's calls for large-scale and popular video conferencing systems are increasing day by day, single MCU video con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/15
Inventor 李未陈舟锋苏袆邹建峰沈伟丁嵘顾钰钏
Owner BEIHANG UNIV
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