Hi experts,
When obtaining the impulse response using ifft, often the generated ir
(impulse response) shows a bit of ripple&noise before t=0. I did some
experiments and here is the observation:
1. Increasing fmax, which is the max freq for the IL extrapolation, doesnt
help reduce the ripple.
2. Changing delta-f shows no avail as well.
3. Although the causality of the sparam is already good enough, still I
tried composing a 'causal' sparam by replacing the imag part of the sparam
w/ the Hilbert transform of the real part. Unfortunately, the thereafter
produced ir is a complete mess. What went wrong here?
I read from some literatures where the authors said they simply zero-out
all the ripples before t=0. Is this a recommended approach? Are there
better solutions to obtain a genuine ir?
Best Regards,
Tramp
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