a unit amplitude square wave f(t)=1 for 0<t<T, and f(t)=-1 for -T<t<0. there is a system which permits angular frequencies < 4 pi/T to be transmitted and >4pi/T to be absorbed. how to find the form of lower pass filter?
Follow Math Help Forum on Facebook and Google+
Originally Posted by szpengchao a unit amplitude square wave f(t)=1 for 0<t<T, and f(t)=-1 for -T<t<0. there is a system which permits angular frequencies < 4 pi/T to be transmitted and >4pi/T to be absorbed. how to find the form of lower pass filter? What are you supposed to know? How sharp a cut off do you need? Why not use an appropriately truncated Fourier series (which can be represented as a convolution in the time domain)? CB
View Tag Cloud