1.小波介绍(续5) 1945: Gabor 开发了STFT( short time fourier transform STFT(,@)=s(t)(t-t)e jot where: s(t)=signal g(t=windowing function ~f蠶五 f 时间 STFT的时间频率关系图1. 小波介绍(续5) • 1945: Gabor • 开发了STFT (short time Fourier transform) ( , ) ( ) where: ( ) signal ( )= windo ( wing ) function j t STFT s t e dt g s t g t t     − = = −  STFT的时间-频率关系图