Hi all,

I'm a student and learning Fourier transform by myself. I want to learn Fast Fourier Transform ans Wavelet Transform but I was advised to begin with Discrete Fourier transform because it's very basic.

I'm reading "understanding digital signal processing" and I don't know how the following figure was drawn. As I understood, in order to draw these figures equations of amplitude response as a function of bin index m, and magnitude response as a function of freq. in Hz (sth like Amplitude=f(m) and Magnitude=f(freq.) ) are needed, right?

But I don't understand how these equations were established?

Could anyone please help? I'm crazy about it