16 May
2023
16 May
'23
10:41 a.m.
Hi Fons!
On 11/16/2022 2:14 PM, Fons Adriaensen wrote:
On Wed, Nov 16, 2022 at 12:51:44PM +0100, Florian Paul
Schmidt wrote:
2. If you measure this, you will also note amplitude differences between
L and R outputs. This is to be expected. Even if the two filters have
exact unity gain (and just a phase shift) at each frequency corresponding
to an FFT bin, the resulting filter will not be all-pass.
Thanks for this comment. It took me a while to grok what you meant. It's
not all-pass because we're in the DFT-World where the FFT-bins are just
_samples_ of the real spectrum. So between these samples non-unity gain
shows up. One way of measuring this would be to use a much longer FFT to
increase the frequency resolution, right?
Kind regards,
FPS
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