I want to convert given signal into frequency domain and do some calculation and then convert that signal into time domain. Here is the code which I am trying out
Fs = 100; % Sampling frequency T = 1/Fs; % Sampling period L = 1000; % Length of signal t = 0:0.001:1; % Time vector fc = 24; %cut-off frequency Wn = (2/Fs)*fc; % normalized value of fc s = sin(2*pi*(Fs/2)*t); x = s; y = fft(x); figure;plot(t,y); b = fir1(10,Wn,'low'); fvtool(b,1,'Fs',Fs) y = filter(b,1,y); figure;plot(t,y); new_x = abs(ifft(y)); figure;plot(t,new_x);
Without applying low pass filter can get original signal by using ifft. But after applying low pass filter can't able to recreate original signal. Can someone let me explain where went wrong?