一种基于平坦测度的瞬态信号检测技术  

A transient signal detection technology based on flatness measure

作　　者：吴晖[1] 舒若[1] 吴乐南[1] 

机构地区：[1]东南大学信息科学与工程学院,南京210096

出　　处：《声学技术》2008年第6期859-862,共4页Technical Acoustics

摘　　要：在感知音频编码中,需要对出现瞬态信号的帧进行特殊处理,其前提是合理地检测出瞬态信号。基于瞬态信号的时域和频域特点,提出一种利用信号的平坦测度作为判决函数的时-频瞬态检测方法。通过MATLAB软件仿真测试,此方法在多数测试音乐中的漏检和误检数量较少,且算法复杂度较低。与已有的瞬态检测方法相比,此方法在漏检和误检方面有所改善,且算法复杂度随着瞬态信号的明显程度自适应的变化,具有检测准确度高、算法简单等优点。In Perceptual audio coding,it is necessary to deal with the transient signals in a frame specially.And a reasonable transient detection is a premise of the treatment.Based on the characteristics of transient signals in time domain and frequency domain,a time-frequency transient detection method using the flatness measure of signals is proposes.Tested by MATLAB emulator,the method with less complexity of the algorithm has much less quantity of missed and misused detection in most testing music signals.Comparing with existing transient detection methods,the method improves the performance of missed and misused detection.At the same time,the complexity of the algorithm adaptively changes with the apparent extent of the transient signal.This method is high in detection accuracy and simple in algorithm realization.

关 键 词：感知音频编码 瞬态检测 平坦测度 预回声失真 

分 类 号：O174.12[理学—数学] TN911.23[理学—基础数学]