摘要
多媒体会议中多点控制单元(multi-point controlling unit,简称MCU)在多点会议中提供音频、视频和数据等的集中处理能力,其中音频处理能力是最基本的,也是实时性要求最高的要素.针对多点多媒体会议的实际应用需求,归类并分析了多种自适应多点语音混合处理方案,提出了采用自动门限和通道压缩处理的高性能混音方案.该方案主要针对人耳听觉的特点,首先去除掉会议中人耳无法分辨的通道,提高混音信噪比;然后对剩下的通道进行语音能量压缩,在保证混音结果不溢出的同时使得输出的语音能量比较稳定,具有良好的听觉主观舒适感.同时,这套方案具有较低的算法复杂度,使用DSP等硬件较易实现,可以广泛应用在多媒体会议系统的实现中.
In multimedia confereneing, multi-point controlling unit （MCU） provides the capabilities to process audio, video and data stream for multi-point conference. The capability of audio processing is basic and requires more for real-time criteria. This paper categorizes and analyzes the schemes, and a new multi-point speech audio mixing scheme using auto-gate-mixing and audio-compressing algorithm is provided to meet the demand of the practical need of multi-point speech processing. By getting rid of the noice channel and compressing the audio data, and they have low complexity and good hearing perceptibility. In the mean time, theschemes are designed for parallel processing, so they can be easily implemented with hardware, such as DSPs, and widely applied in multimedia conferencing systems.
出处
《小型微型计算机系统》
CSCD
北大核心
2009年第1期169-172,共4页
Journal of Chinese Computer Systems
关键词
多媒体会议
多点控制单元
实时
混音
自动门限
语音压缩
multimedia conferencing
MCU （multi-point controlling unit）
real-time
audio mixing
auto-gating
audio-compressing
