I would like to implement a crossover filter (IIR) on the DSP ADAU1452. To improve the phase response, I found on the internet the solution to reverse filter the original signal and add in on top of the filtered signal.
My question is: What is the length of the IIR impulse response? Or how can I change it? And is it possible to save the impulse response and reverse it? (Meaning i take the last value first and so on.) Or is there even a simple tool/block that does this automatically?
Note: To be honest I haven't thought much about the processing power or delay this operation will need. I just wanted to see, if it works in theory.