Module windowfunctions

source code

Window functions.

A window with a high dynamic range is a window that can distinguish peaks in a broad range of amplitudes. Usually, this goes together with loss in resolution and detection power (higher noise).

Example usage: calculate the window function of timeseries, using different windows.

>>> import tfreq
>>> from pylab import figure,show,legend,plot,xlim
>>> times = linspace(0,150,10000)
>>> signal = ones(len(times))
>>> windows = ['rectangular','hann','hamming','cosine','bartlett']
>>> windows += ['nuttall','blackman-harris']
>>> for window in windows:
...   pergram = tfreq.scargle(times,signal,fn=1.5,df=0.0005,norm='amplitude',window=window)[1]
...   p=figure(1)
...   p=plot(pergram[0],pergram[1],'-',label=window)
...   p=figure(2)
...   p=plot(log10(pergram[0]),log10(pergram[1]),'-',label=window)
>>> p=figure(1);p=legend();p=xlim(0,1.5)
>>> p=figure(2);p=legend(loc='lower left');p=xlim(-2.5,-0.3)