摘要
本文从时频分布的物理概念出发,首先指出了各种时频分析方法的内在联系和差别,然后着重从连续子波变换在信号分析中的物理意义来讨论它的数学表示和特有性质,并和短时傅里叶变换作了比较。接着对连续子波变换在时间尺度平面上的离散化的概念作了扼要描述。最后,基于文中叙述的物理概念,对子波变换的应用和进展作了简要评述。
Based on the concept of time-frequency distribution, the relationship and differences among various time-frequency methods are described. Then the mathematical expression of continuous wavelet transform and its significant meaning in signal processing are discussed. Compared with short-time Fourier transform the special characteristics of continuous wavelet transform are shown. The concept of-the discrete case of continuous wavelet transform in time-scale plane is introduced. Finally, some applications and advances of wavelet transforms are reviewed based on concepts proposed in this paper.
基金
国防科技预研基金
关键词
时频分布
短时
傅里叶变换
子波变换
Time-frequency distribution, Short-time Fourier transform, Wavelet transform
