摘要
基于声音信号在时频域分布规律,借用分形理论,提出一种新的客观声品质评价指标——时频域分形维数差(DFDTF)。它结合了声音信号在时域及频域的特性,利用时域和频域分形维数之差对声品质进行评价,能综合反应声音信号跌宕起伏的程度,时频域分形维数差越小,声音信号的声品质越高。利用分形维数差对7种不同类型的典型声音信号进行声品质评价,结果表明,7类声音信号的时频域分形维数差有明显差异,该评价结果与人的主观感受非常一致,可利用它进行声音信号分类;同时,该结果和传统的客观声品质评价参数(尖锐度、粗糙度和波动度)的结果比较一致,能恰如其分反应声音信号的声品质。时频域分形维数差作为一种新的声品质评价方法,具有比传统声品质评价参数更简单的计算过程,且能以单一参数较为综合的反应声音信号的声品质;同时,该方法将分形理论引入到声品质研究当中,为后续研究提供了一种新的思路和方法。
Based on the distribution rules of sound signals in time-frequency domain and the fractal theory, a new quality evaluation index, the difference fractal dimension of time and frequency domain（DFDTF）, is proposed. It combines the characteristics of the sound signals in time and frequency domains and can evaluate the sound quality by the difference of fractal dimension in the time and frequency domains. The smaller the DFDTF is, the higher the sound quality of the sound signal has. The sound quality of seven different typical sound signals are evaluated by the DFDTF and the results show that those seven sound signals have obvious differences which is very consistent with the subjective feelings of people.Therefore, a new methodology for music automatic classification can be proposed. At the same time, the results are also consistent with the traditional objective sound quality evaluation parameters（sharpness, roughness and fluctuation strength）which can appropriately reflect the sound quality of the sound signal. As a new method for evaluating the sound quality, the DFDTF has a simpler calculation process than the traditional evaluation methods. It uses a single parameter to indicate the comprehensive sound quality. The fractal theory is also introduced to study the sound quality which provides a new way for the follow-up study.
作者
刘红星
吴九汇
张俊
张林
郭峰
LIU Hongxing;WU Jiuhui;ZHANG Jun;ZHANG Lin;GUO Feng(School of Mechanical Engineering, Xi＇ an Jiaotong University, Xi＇ an 710049, China;State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi＇ an Jiaotong University, Xi＇an 710049, China;Xi＇ an Aeronautical Polytechnic Institute, Xi＇ an 710089, China)
出处
《噪声与振动控制》
CSCD
2018年第A02期526-531,共6页
Noise and Vibration Control
基金
国家自然科学基金资助项目(51675401)
