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I am doing the project end of career and need to detect the fundamental frequency of a
musical note in real-time, at first I use the algorithm HPS but the results are not good.
Also I use the autocorrelation, but to calculate the period of the resultant sign use AMDF but
the results are not good either, and the ASDF do not be since it is. If someone can help me
with this.
I´m sorry my english.
Thank you 
regards
	

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I don't know what HPS, AMDF or ASDF are (or what "good" means to you), but if you can
find the book "C Algorithms for Real-Time DSP" by Paul M. Embree (Prentice Hall 1995)
it has a C program written to do auto-regressive (AR) frequency estimation. The basic approach
is a Hilbert transform filter to get the complex or analytic version of the real signal, then
estimate the frequency from the arctangent of the phase difference between successive complex
samples.

MArk

-----Original Message-----
From: audiodsp@audi... [mailto:audiodsp@audi...] On Behalf Of manzanotejon_82@manz...
Sent: Tuesday, January 17, 2006 1:07 PM
To: audiodsp@audi...
Subject: [audiodsp] pitch detection

I am doing the project end of career and need to detect the fundamental frequency of a musical
note in real-time, at first I use the algorithm HPS but the results are not good.
Also I use the autocorrelation, but to calculate the period of the resultant sign use AMDF but
the results are not good either, and the ASDF do not be since it is. If someone can help me
with this.
I´m sorry my english.
Thank you
regards
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Thank you.

(You need to be a member of audiodsp -- send a blank email to audiodsp-subscribe@yahoogroups.com )

In my experience, these standard methods can work quite well when they
are tweaked a bit. You could also try to combine different methods.

Cheers,
(a)

manzanotejon_82@manz... wrote:
> I am doing the project end of career and need to detect the fundamental frequency of a
musical note in real-time, at first I use the algorithm HPS but the results are not good.
> Also I use the autocorrelation, but to calculate the period of the resultant sign use AMDF
but the results are not good either, and the ASDF do not be since it is. If someone can help me
with this.
> I´m sorry my english.
> Thank you 
> regards

-- 
dipl. ing.
alexander lerch

zplane.development
:www.zplane.de
katzbachstr.21
d-10965 berlin

fon: +49.30.854 09 15.0
fax: +49.30.854 09 15.5
	

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