Howtosignalprocessing
What is a single pole filter?
In filter design it is understood that a single RC circuit – a circuit with one capacitor and one resistor – is a one “pole” filter.
What does pole mean in filters?
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 single pole low-pass filter?
The one-pole low-pass filter is often used to seek trends in noisy signals. For instance, if you use a physical controller and only care about changes on the order of 1/10 second or so, you can smooth the values with a low-pass filter whose half-power point is 20 or 30 cycles per second.
