Wait a minute. I  what does that mean ? The variance of the spectrum of excitation.
Yeah. So the  So basically the spectrum of the excitation  for a purely periodic sig signal shou sh
OK. Yeah , w what yo what you 're calling the excitation , as I recall , is you 're subtracting the  the , um  the mel  mel   mel filter , uh , spectrum from the FFT spectrum.
e That 's right. Yeah. So