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Re: Robust method of fundamental frequency estimation.

Piano harmonics are stretched or detuned, significantly so for low notes, so calculating f0 is non-trivial. Here's a paper that might offer some insight.

"Understanding the complex nature of the piano tone" by Martin Keane
at the Acoustics Research Centre at the University of Aukland (Feb 2004).


Roisin Loughran wrote:
Dear list,

I was wondering if any of you know the most robust way to calculate the fundamental frequency of a note across the range of a variety of instruments?

I'm currently working on a matlab program and have tried using the auto-correlation method and the cepstrum method but have found that these both have difficulty in calculating f0 of timbre-rich tones such as those from a piano - particularly in the lower pitch ranges. Does anyone know of a method that is more reliable in these regions or is it necessary that I investigate such complex tones by a different means? From examining a number of the FFTs from these signals it is tempting to just pick the first strongest partial - the complex overtones just seem to confuse the more complicated algorithms, but I realise that this is hardly a reliable approach.

Any suggestion would be greatly appreciated,
Thanks in advance,

Roisin Loughran

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