摘要
混音处理在网络电话会议系统中起着举足轻重的作用,怎样解决混音中带来的溢出和噪声问题又是混音处理的核心。通过对现有混音算法中存在问题的分析,提出了一种自适应减谱法,在不发生溢出现象的基础上,对语音信号进行傅里叶变换,从带噪语音的功率谱中减去噪声功率谱,从而得到较为纯净的语音频谱来降低噪声,再进行傅里叶反变换将其与混音权重相适应,使混音后的音质更清晰且流畅,避免了混音过程中的噪声问题,提高了混音后的质量,音质更接近于现场会议,可以应用于多媒体电话会议系统中。
Mixing treatment plays a pivotal role in Internet phone conference system. The core of mixing processing is how to resolve overflow and noise problems caused by the mixing. By analyzing the existing problems in mixing algorithm, an adaptive spectral method was proposed. Without overflowing, Fourier transform was applied to the speech signal. The noise power spectrum was removed from the noisy speech power spectrum, and then a more pure voice frequency spectrum was achieved. Fourier inverse transform was compatible with the mixing weights to make the sound quality clearer and more naturally smooth after mixing. It solves noise problems of mixing process and improves the quality of post-mixing to approximate the effect of real meeting. Therefore, it can be applied to multi-media conference system.
出处
《计算机应用》
CSCD
北大核心
2010年第2期564-566,共3页
journal of Computer Applications
关键词
混音
电话会议
自适应减谱法
傅里叶变换
功率谱
mixing
telephone conference
adaptive spectrum
Fourier transform
power spectrum
