Cracking the unisons

[b98tu@t-online.de]

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, that´s 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 don´t and there are good physical reasons why they don´t. (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 ETD´s 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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