Dec 30, 2002 #1 estarg Electrical Dec 23, 2002 3 Does anyone have the mathematical definition of the flattop window, sometimes called the Potter 201 window?
Does anyone have the mathematical definition of the flattop window, sometimes called the Potter 201 window?
Dec 30, 2002 #2 WIM32 Mechanical Feb 21, 2000 52 calculation flattop window: (t)=0.2395-0.4581*cos(2**t/T)+0.2585*cos(4**t/T)-0.0439*cos(6**t/T) if 0<t<T otherwise (t)=0 rgrds Wim Upvote 0 Downvote
calculation flattop window: (t)=0.2395-0.4581*cos(2**t/T)+0.2585*cos(4**t/T)-0.0439*cos(6**t/T) if 0<t<T otherwise (t)=0 rgrds Wim
Jan 10, 2003 #3 VibEngr Mechanical Sep 28, 2002 12 I'm sorry, but WIM32's formula looks a little strange. There should be a pi and no exponents. Also, the initial constant should be close to unity. For the P201 window I have: a0=0.999028 a1=2*0.925752 a2=2*0.351960 a3=0 a4=0 w = a0 - a1*cos(2*pi*t/T) + a2*cos(4*pi*t/T) - a3*cos(6*pi*t/T) + a4*cos(8*pi*t/T) I hope this helps, Troy Upvote 0 Downvote
I'm sorry, but WIM32's formula looks a little strange. There should be a pi and no exponents. Also, the initial constant should be close to unity. For the P201 window I have: a0=0.999028 a1=2*0.925752 a2=2*0.351960 a3=0 a4=0 w = a0 - a1*cos(2*pi*t/T) + a2*cos(4*pi*t/T) - a3*cos(6*pi*t/T) + a4*cos(8*pi*t/T) I hope this helps, Troy
Jan 10, 2003 #4 VibEngr Mechanical Sep 28, 2002 12 I almost forgot the last part to normalize the window: w = w / (a0+a1+a2+a3+a4) Regards, Troy Upvote 0 Downvote
