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% applying the fourier series in sin cos form

% getting the fourier coefficients ak and bk % setting any complex fourier coefficients smaller than 0.9 times the % dividing the complex fourier coefficients by n % getting the complex fourier coefficients using fft

Using ak and bk from 1 to s we can put them into the sin cos form of the fourier series. Next we get the complex fourier coefficients using fft. The function generating the signal in this post will be: You can download the Matlab file: denoise.m Reducing the noise of a signal in Matlab using fast fourier transform.