信号音检测在噪声消除系统中的实现

将噪声消除系统应用在手机的下行链路时,在消除环境背景噪声的同时,发现下行信号音失真。这是因为噪声消除系统中的VAD（Voice Activity Detection）算法对功率剧烈变化的信号音敏感造成的。经过详细研究信号音的时频特性,以及网络传输的误差因素,提出了一种新的适用于下行噪声抑制系统的信号音检测算法,这种算法利用每帧信号的频域功率变化和时域信号周期变化来检测信号音,经过理论评估和实际验证,该算法在不影响噪声消除系统的功能前提下,能准确地检测出信号音,从而避免了失真的发生。

The implementation of signal tone detection in noise cancellation system

While applying the NC (Noise Cancellation) system to the downlink of mobile telephone,the signal tone distortion is found at the same time of canceling the noise.This is because the VAD algorithm of the NC system is sensitive to dramatic changes in the power of signal tone.Considered the time and frequency domain characteristics and the error factor of the network transfers,a new algorithm of the signal tone detection fit for the downlink NC system is proposed,which uses the frequency domain power and the t...