> 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
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