For background I am not an engineer, and reading about linear predictive coding, so this question may be very trivial.
I am trying to understand what a textbook means by referring to something as an "all pole source".
It says that speech (in the frequency domain) is not typically an all-pole source because there are zeros present in the spectrum due to glottal pulses and the physiology of the vocal tract.
As I have looked into this, it looks like "poles" are when an equation (transfer function?) blows up to infinity, and "zeros" are when it approaches zero. The textbook says that there are both poles and zeros present in a spectral representation of speech. Does that mean the energy present in the spectrogram? If this is so, there are no times when there is infinite energy, and no times when there is an absolute loss of energy, so I find this pretty confusing...
Given that context, my question is this: what does an "all pole source" mean in this context? And what does it mean to have poles and zeros in a spectral representation of human speech?
