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 ...set $ACCENT_IMAGES  to get an image 

No number for "PulsewidthmodulationusingthevonHannwindowfunction:(a)thefunction$W(phi)=(1+cos(phi))/2$;(b)thefunctionasawaveform,repeatedatadutycycleof100%(modulationindex);(c)thewaveformata50%dutycycle()."
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No number for "FourieranalysisinPd:(a)the$mathrm{fft}sim$object;(b)usingasubwindowtocontrolblocksizeoftheFouriertransform;(c)thesubwindow,usingarealFouriertransform(the<TT>fft&#126;</TT>object)andtheHannwindowingfunction."
