Re: [linux-audio-dev] IR FFT smoothing

======= On Thursday 06 July 2006 11:19, Denis Sbragion wrote: ======= Hello Andrew, ... this looks pretty much like the classical "running average" smoothing, which is one of the standard methods used to perform fractional octave smoothing. For most purposes this is pretty good. BTW there's one thing that is unclear to me: ... ... Here x[idx] is a complex value or a real one (i.e. magnitude only)? If it's a real one you're doing the standard fractional octave smoothing, if it is a complex one you're doing something pretty close to complex smoothing. Looking at the results it should be a real value, else there should be the typical phase cancellation problems of the complex smoothing procedure. There are some way to overcome these problems. I have a paper where smothing is performed separately on the magnitude and phase of the response. The results are really good in this situation, as long as you are able to compute the continuous (unwrapped) phase function, which is a challenging task by itself. Bye, -- Denis Sbragion InfoTecna Tel: +39 0362 805396, Fax: +39 0362 805404 URL: http://www.infotecna.it ================================================================================= Denis, x[n] is real (abs() of the FFT result). It is interesting, I still have not found any article about fractional octave smoothing. All googling results lead to cited AES article. So, applied smoothing is as an "invention" for me :-) Is your paper about smoothing free? Andrew