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DSP concept of forward-reverse processing for linear phase

Question asked by FelixGerstenberger on Nov 17, 2016

Hello,

 

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.

 

Thanks, Felix

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