tftb_window.m 短时傅立叶变换窗函数
代码说明：
tftb_window.m 短时傅立叶变换窗函数，在进行短时傅立叶变换时使用tfrstft函数，其中h-窗函数调整时使用的函数。 tftb_window Window generation. H=tftb_window(N,NAME,PARAM,PARAM2) yields a window of length N with a given shape. N : length of the window NAME : name of the window shape (default : Hamming) PARAM : optional parameter PARAM2 : second optional parameters Possible names are : "Hamming", "Hanning", "Nuttall", "Papoulis", "Harris", "Rect", "Triang", "Bartlett", "BartHann", "Blackman" "Gauss", "Parzen", "Kaiser", "Dolph", "Hanna". "Nutbess", "spline", "Flattop" For the gaussian window, an optionnal parameter K sets the value at both extremities. The default value is 0.005
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