I am constructing a MFCC and come to a section which is kind of confusing me.
Step 4: Fast Fourier Transform
and has this equation:
Now I understand that FFT needs to be carried out, I just don't understand where the values are meant for:
Up to now, I have:
- Inputted the raw signal (vector)
- Pre-emphasis filtering on the signal
- Carried out "Framing" (vector of vectors)
- Computed Hamming Window
It's just this step I am unsure of.
Hope someone can help :)