On Sat, Mar 7, 2020, at 6:00 AM, Zhiguang Eric Zhang wrote:
> Traditional FIR/IIR filtering is ubiquitous but actually does suffer from
> drawbacks such as phase distortion and the inherent delay involved. FFT
> filtering is essentially zero-phase, but instead of delays due to samples,
> you get delays due to FFT computational complexity instead.
I wouldn’t say the delay when using FFT processing is due to computational
complexity fundamentally. Compute affects your max throughput more than your
latency. In other words, if you had an infinitely-fast computer you would still
have to deal with latency. The issue is just that you need at least 1 block of
input before you can do anything. It’s the same thing as with FIR filters, they
need to be causal so they can’t be zero-phase. In fact you could interchange
the FFT processing with a bank of FIR band pass filters that you sample from
whenever you want to get your DFT frame. (that’s basically just a restatement
of what I said before about the STFT.)
-s
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