Subject: Re: Robust method of fundamental frequency estimation. From: Kelly Fitz <kelly_fitz@xxxxxxxx> Date: Wed, 31 Jan 2007 09:58:03 -0800 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>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). best, Kelly 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 > > ------------------------------------------------------------------------ > New Yahoo! Mail is the ultimate force in competitive emailing. Find out > more at the Yahoo! Mail Championships > <http://uk.rd.yahoo.com/mail/uk/taglines/default/championships/games/*http://uk.rd.yahoo.com/evt=44106/*http://mail.yahoo.net/uk/>. > Plus: play games and win prizes. -- Kelly Fitz, DSP Research Engineer Starkey Hearing Research Center