I am pretty familiar with IIR and FIR filtering and I have implemented them in my several projects. However, recently i found something called zero phase filtering. I have tried to understand it but not going well. All i know is that zero phase filtering is filtering that do not produce any phase delay and distortion
- Is it right?
I have understood that FIR have a constant delay for a group signal while IIR have a non linear delay based on the frequency, so it will distort the signal phase.so there is a zero phase IIR to overcome the cons
- How does the zero phase IIR work? (Needs an overview and maybe some examples)
And i have read about forward backward filtering that also remove the delay and distortion of filtering
- How does it work?
- Is it one of the zero phase filtering method?
- It said that it can be done in offline filtering. What is offline filtering?