Tunelab and Verituner use both FFT as pre anaylsis. Every box has its own procedure by mangling the partials to calculate a virtual overall pitch, but the exact realtime float cannot be caught that way with todays sample rates. Cybertuner uses counting of cero crossings of filtered signal, needs also means over a longer time period. (see patent papers) > FFT phase angle, but if there is a way to measure a piano tone partial > accurately in real time (or at all, for that matter) with FFT, I'd sure > like to know the method. there is actually no, thatīs what i said. regards, Bernhard ----- Original Message ----- From: "Ron Nossaman" <rnossaman@cox.net> To: "Pianotech" <pianotech@ptg.org> Sent: Saturday, January 07, 2006 1:02 AM Subject: Re: Cracking the unisons > > >> No they donīt and there are good physical reasons why they donīt. (You >> will find not one tuner at Steinway (at least in Hamburg) who is allowed >> to service concerts with an ETD for example). This has nothing to do with >> traditionalism or ignorance to modern technology. >> Most modern ETDīs are doing fast fourier transformation (FFT) for pitch >> calculation. > > Oh, really? The only one I know of using FFT for anything is Tunelab, for > the spectrum display (and perhaps unison determination). Pitch matching is > done with an entirely different algorithm. I've put in a fair amount of > time writing code and exploring DSP pitch detection methods, and real > world pitch detection is tough. A pure tone can be measured accurately > with an FFT phase angle, but if there is a way to measure a piano tone > partial accurately in real time (or at all, for that matter) with FFT, I'd > sure like to know the method. > > Ron N > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives
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