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<blockquote data-quote="Mark DeArman" data-source="post: 147980" data-attributes="member: 950">Re: FIR filtersI agree, now that I re-read your order of operations list up there, that looking at it from the group delay perspective is better.&nbsp; You&#039;ve basically constructed a STFT with fixed lag windows starting from the frequency domain perspective.Thus you&#039;re TFE will fail to be concentrated when the phase is too steep and fails the stationary phase condition for the FFT of the input signal.&nbsp; Which is what we see in the plots you provided.&nbsp; I&#039;m not exactly clear on what the rest of the operations do.&nbsp; If you really want that hilbert transform I would recommend building it into your filter bank as opposed to using the FFT method, if you are not already doing so.&nbsp; The filter method would be better, since you could construct and test the bands where they are operating.All in all, I&#039;m pretty impressed, looks a lot better (useful) than other peoples implementations I&#039;ve seen over the years !</blockquote>

[QUOTE="Mark DeArman, post: 147980, member: 950"] Re: FIR filters I agree, now that I re-read your order of operations list up there, that looking at it from the group delay perspective is better. You've basically constructed a STFT with fixed lag windows starting from the frequency domain perspective. Thus you're TFE will fail to be concentrated when the phase is too steep and fails the stationary phase condition for the FFT of the input signal. Which is what we see in the plots you provided. I'm not exactly clear on what the rest of the operations do. If you really want that hilbert transform I would recommend building it into your filter bank as opposed to using the FFT method, if you are not already doing so. The filter method would be better, since you could construct and test the bands where they are operating. All in all, I'm pretty impressed, looks a lot better (useful) than other peoples implementations I've seen over the years ! [/QUOTE]

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