Howtosignalprocessing
What do poles do in a filter?
Poles represent frequencies that cause the denominator of a transfer function to equal zero, and they generate a reduction in the slope of the system's magnitude response.
What is a pole in an RC filter?
This is known as an RC circuit (Resistance and Capacitance). In filter design it is understood that a single RC circuit – a circuit with one capacitor and one resistor – is a one “pole” filter. A two pole filter has two RC circuits, and so on.
What is all pole filter?
The filters described in this article are all-pole filters with no zeros. That is, an all-pole filter has a frequency response function that goes infinite (poles) at specific frequencies, but there are no frequencies where the response function is zero.
