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Quick and real-time sound mixing method for multimedia conference

A multimedia conferencing and sound mixing technology, which is applied in the branch office to provide special service devices, sound equipment, data exchange details, etc., can solve problems affecting speech recognition, volume fluctuating, volume changes, etc., to avoid sudden changes in volume, Natural-sounding, wide-ranging effects

Inactive Publication Date: 2009-06-03
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] At present, people have developed a variety of mixing methods, but they have a common shortcoming: the volume changes suddenly and suddenly during the mixing process.
The reason is: the mixing weight of each channel audio input in the existing various mixing algorithms is a function of time t, so as time changes, its mixing weight will also change accordingly, which in turn leads to the The volume of the audio stream will be scaled to varying degrees over time, which will cause the volume to fluctuate during the mixing process, seriously affecting speech recognition

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  • Quick and real-time sound mixing method for multimedia conference

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Embodiment Construction

[0016] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0017] Assuming that in a multimedia conference, there are a total of M representatives participating in the speech, there are M channels of audio input signals participating in the mixing, and these input signals participating in the mixing are all digital signals that have been processed by sampling, quantization, and filtering. In this way, a representative who participates in the meeting and makes a speech will receive the output signals after the audio mixing of other M-1 channels, that is, the output signals after the audio mixing of the other channels except his own channel. In addition, there are M+1 channels of mixed output signals, and the M+1 th mixed output signal is an output signal obtained by mixing all M input signals, which can be listened to by de...

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Abstract

The invention relates to a fast real-time sound mixing method used in multimedia conference. It first does linear superposition to the inputted signal and dose chain segment compaction processing to the superposition signal so that the sound mixed output signal value is at normal range; it uses the chain segment compaction factor which is non-relative to the time and sound mixing input and each chain segment compaction factor forms a geometric progression during the chain segment compaction processing course.

Description

technical field [0001] The invention relates to a multimedia conference communication technology, more precisely, relates to a fast real-time audio mixing method for a multimedia conference, and belongs to the technical field of audio mixing in multimedia conference communication. Background technique [0002] In recent years, multimedia conferencing has become one of the hot spots in the development of multimedia communication. In the multimedia conferencing system, audio mixing processing is the key link, which directly affects the mutual communication between users. As the most basic element in multimedia conferencing - audio communication is the most frequent, and its real-time requirements are far higher than those of video and data. In order to have a better conference presence, participants hope to hear the voices of multiple speakers at the same time. and then play it back. This method requires a large amount of network bandwidth, affects the quality of voice sign...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K15/08H04L12/18
Inventor 廖建新王晶王纯李炜王文林朱晓民武家春张磊樊利民程莉
Owner BEIJING UNIV OF POSTS & TELECOMM
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