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Method for multi-microphone sound mixing of video conference system

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

Active Publication Date: 2014-12-17
XIAMEN YEALINK NETWORK TECH
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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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  • Method for multi-microphone sound mixing of video conference system
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  • Method for multi-microphone sound mixing of video conference system

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Embodiment Construction

[0038] Please refer to figure 1 , The present invention is a multi-microphone mixing method of a video conference system, the method includes 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 speaker plays the sound, and the multiple microphone channels collect the sound; the sound played by the speaker and the sound collected by each microphone channel are stored in blocks by frame to obtain the playback frame energy of the speaker and the collection of each microphone channel Frame energy, the length of each frame is a fixed value, and each frame contains multiple points: Taking the sampling frequency of 8K as an example, if the length of each frame of sound is 10 mm, each frame contains 80 points, and if the length of each frame of sound is 20 mm , Then each frame contains 160 points;

[0040] Such as figure 2 As shown, tak...

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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, and more specifically, to a multi-microphone sound mixing processing method used in a video conference. Background technique [0002] Early video conference systems generally used directional or omnidirectional microphones for sound collection. The sound collection range of omnidirectional microphones is large, but the reverberation is serious, and the sound quality is poor. The sound quality of directional microphones is good, but the sound collection range is narrow. Contradictory with the sound collection range, the current video conference 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. How to combine the data collected by multiple microphones to form the best sound mixing effect (multiple channels of voice data are mixed to form one output voice) has become a core ...

Claims

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Application Information

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