filter.m

It a filter. Buterwarth filter. very important tool in gsm

clear;
h=[1 2 3 4 5 6 7 8 9 10 11 12 13 15 20 30 40 8 7 6 5 4 3 2 1 ];
x=randn([1,1000]);
subplot(2,1,1),plot(x);
axis([0,1000,-5,5]);
z=filter(h,sum(h),x);
subplot(2,1,2);
plot(z);
axis([0,1000,-5,5]);