文章摘要
谷志茹,陈顺科.信号音检测在噪声消除系统中的实现[J].声学技术,2010,(1):56~59
信号音检测在噪声消除系统中的实现
The implementation of signal tone detection in noise cancellation system
投稿时间:2008-10-16  修订日期:2009-01-20
DOI:
中文关键词: 噪声消除  信号音检测  语音激活检测(VAD)
英文关键词: noise cancellation  signal tone detection  voice activity detection
基金项目:
作者单位E-mail
谷志茹 联芯科技通信设备有限公司, 上海, 200233 guzhiru@leadcoretech.com 
陈顺科 株洲天成自动化技术有限责任公司, 湖南株洲, 412007  
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中文摘要:
      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。
英文摘要:
      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 time domain period change to detect signal tone.The academic evaluations and practical tests prove that the algorithm can more precise detect signal tone,without degrading the performance of the NC system,so as to avoid the occurrence of distortion.
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