【摘要】 STFT分辨率固定,小波变换会出现局部相位信息且时间-尺度关系不适合直观视觉分析。提出基于改进S变换的语音信号时频分析。样条小波作为小波变换母小波乘以相位因子得到改进S变换,具有多分辨率和相位因子,并适合直观视觉分析。仿真实验得到的时频分布结构图与STFT、小波变换分布比较,显示改进S变换时频结构更加细致。更多还原

【Abstract】 STFT has fixed resolution and wavelet transform has a partial phase information and time-scale relations are not suitable for an intuitive visual analysis.Time-frequency analysis of speech signal based on an improved S transform was proposed.Wavelet transform with spline wavelet as the mother wavelet multiplied by the phase factor was the improved S transform,which had multi-resolution and phase factor and was suitable for the intuitive visual analysis.Simulation experiments show the time-frequency structure of the improved S transform is more fine compared with STFT and wavelet transform.更多还原