[LAD] Re: stereospread.lv2 - Stereo spreading plugin (conjugate random phase all-pass filter pair)
Florian Paul Schmidt <[email protected]>
| Newsgroups | gmane.linux.audio.devel |
|---|---|
| Message-ID | <[email protected]> |
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 -- https://dfdx.eu _______________________________________________ Linux-audio-dev mailing list -- linux-audio-dev-cunTk1MwBs/[email protected] To unsubscribe send an email to linux-audio-dev-leave-cunTk1MwBs/[email protected]