peo p

https://www.icad.org/Proceedings/2008/BrungartSimpson2008a.pdf

hi, i came across this article and few questions came up as i didnt manage to make patch work :

1)  p. 2.1.2. "...This baseline filter was converted into the frequency domain representation A[k] with an Discrete Fourier Transform (DFT), and then the individual coefficients of A[k] were modified with three different cues associated with the upward or downward pitch of the aircraft:"   how does one convert impulse function into frequency domain representation ? I've used bin number and [index~] and it hadn't worked.

2) Why "sinc" function is used ? afaik sinc is a "lowpass" filter not "allpass".

https://www.icad.org/Proceedings/2008/BrungartSimpson2008a.pdf
hi, i came across this article and few questions came up as i didnt manage ... 

fft - convert impulse function to its frequency representation