摘要
针对目前视频会议系统中运用自适应算法解决混音信号溢出问题中出现的弱信号被进一步衰减的问题,提出了一种改进算法.该算法采用在信号幅值上设置衰减阀值参量,再将语音信号各采样点幅值与此阀值对比大小,以决定是否对其衰减的方法,差别化混音信号的衰减过程,达到既消除溢出噪声又保持整体音质的目的.通过利用已采集好的4路语音信号在桌面计算机平台混音测试,分析了诸算法的实验效果.结果表明,经该算法处理的语音信号提高了信噪比,保持了弱采样点信号声强,适于音质要求清晰、连贯的高级别视频会议.
To overcome the overflow and the attenuation of weak audio mixing signals by using adaptive algorithm in video conference system, a new method was proposed based on the adaptive algorithm. An attenuation threshold was set on the signal amplitude, with whom the size of sample amplitude was compared to determine whether attenuation to be adopted. The proposed attenuation process could eliminate the overflow noise and guaranteed the overall acoustic quality. Audio mixing tests were implemented by analyzing each algorithm＇s effect of four prepared speech signals on the platform of desktop PC. The results showed that the speech signal＇s SNR was improved which was treated with the proposed algorithm. It holds the weak sample＇s sound intensity, suits to classical video conference system with higher demand of clear and coherent in speech.
出处
《中北大学学报（自然科学版）》
CAS
北大核心
2012年第4期431-436,共6页
Journal of North University of China(Natural Science Edition)
关键词
混音
差别化
自适应
声强
audio mixing
differentiated
self-adaptive
sound intensity
