声学技术
聲學技術
성학기술
Technical Acousitics
2010年
1期
56-59
,共4页
噪声消除%信号音检测%语音激活检测(VAD)
譟聲消除%信號音檢測%語音激活檢測(VAD)
조성소제%신호음검측%어음격활검측(VAD)
noise cancellation%signal tone detection%voice activity detection
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.
將譟聲消除繫統應用在手機的下行鏈路時,在消除環境揹景譟聲的同時,髮現下行信號音失真.這是因為譟聲消除繫統中的VAD(Voice Activity Detection)算法對功率劇烈變化的信號音敏感造成的.經過詳細研究信號音的時頻特性,以及網絡傳輸的誤差因素,提齣瞭一種新的適用于下行譟聲抑製繫統的信號音檢測算法,這種算法利用每幀信號的頻域功率變化和時域信號週期變化來檢測信號音,經過理論評估和實際驗證,該算法在不影響譟聲消除繫統的功能前提下,能準確地檢測齣信號音,從而避免瞭失真的髮生.
장조성소제계통응용재수궤적하행련로시,재소제배경배경조성적동시,발현하행신호음실진.저시인위조성소제계통중적VAD(Voice Activity Detection)산법대공솔극렬변화적신호음민감조성적.경과상세연구신호음적시빈특성,이급망락전수적오차인소,제출료일충신적괄용우하행조성억제계통적신호음검측산법,저충산법이용매정신호적빈역공솔변화화시역신호주기변화래검측신호음,경과이론평고화실제험증,해산법재불영향조성소제계통적공능전제하,능준학지검측출신호음,종이피면료실진적발생.
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 networ ktransfers,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 occiLrretlce of distortion.
