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A multi-microphone mixing method for a video conferencing system

A video conferencing system and multi-microphone technology, applied in the field of multi-microphone mixing processing, can solve the problems of poor sound quality, serious reverberation, and narrow sound collection range, and achieve the effect of ensuring the effect of echo cancellation

Active Publication Date: 2017-05-24
XIAMEN YEALINK NETWORK TECH
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AI Technical Summary

Problems solved by technology

[0002] Early video conferencing systems generally used directional or omnidirectional microphones for sound collection. Omnidirectional microphones have a large sound collection range, but severe reverberation and poor sound quality. Directional microphones have good sound quality, but narrow sound collection range. Contradicting with the range of sound collection, the current video conferencing system has begun to adopt a multi-microphone solution, through the combination of multiple directional microphones, to ensure the sound collection range and sound quality

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  • A multi-microphone mixing method for a video conferencing system
  • A multi-microphone mixing method for a video conferencing system
  • A multi-microphone mixing method for a video conferencing system

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Embodiment Construction

[0038] Please refer to figure 1 , the present invention is a multi-microphone mixing method for a video conferencing system, said method comprising a sound collection process, a delay estimation process, an echo channel determination process, a mixing source selection process and a mixing output process:

[0039] The sound collection process is: the loudspeaker plays sound, and a plurality of microphone channels collects sound; the sound played by the loudspeaker and the sound collected by each microphone channel are stored in blocks by frames, and the playback frame energy of the loudspeaker and the collection of each microphone channel are obtained. Frame energy, the length of each frame is a fixed value, and each frame contains multiple points: Take the sampling frequency 8K as an example, if the length of each frame of sound is 10 mm, then each frame contains 80 points, if the length of each frame of sound is 20 mm , each frame contains 160 points;

[0040] Such as figu...

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Abstract

The invention provides a method for multi-microphone sound mixing of a video conference system. A maximum echo channel is decided and excluded through a delay time between sounds acquired by various microphone channels and loudspeaker playing sounds and energy capacity of the acquired sounds, and then a sound acquired by an optimum channel is selected as a sound mixing source and a sound mixing weight of the selected channel is determined based on frame energy values acquired by various optional channels and correlation of the acquired frame energy values, and finally, sound mixing output is performed according to the selected channel and the determined sound mixing weight. By the aid of the method, the sound acquired by the optimum channel is selected as an optimum sound mixing source, and all algorithms are designed bases on self-adaption, so the optimum sound mixing source can be adjust dynamically, and acquisition range and tone quality of the sound are guaranteed.

Description

technical field [0001] The present invention relates to a sound mixing processing method, in particular to a multi-microphone sound mixing processing method for video conferencing. Background technique [0002] Early video conferencing systems generally used directional or omnidirectional microphones for sound collection. Omnidirectional microphones have a large sound collection range, but severe reverberation and poor sound quality. Directional microphones have good sound quality, but narrow sound collection range. Contradicting with the range of sound collection, the current video conferencing system has begun to adopt a multi-microphone solution to ensure the sound collection range and sound quality through the combination of multiple directional microphones. And how to combine the data collected by multiple microphones to form the best sound mixing effect (multi-channel voice data is mixed to form one output voice) effect has become the core problem to be solved in the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04H60/04
Inventor 毕永建
Owner XIAMEN YEALINK NETWORK TECH
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