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Matlab - Guitar Tuner

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  • 16-02-2007 4:24pm
    #1
    Redegg
    Registered Users Posts: 361 ✭✭


    Ok, I am making a BASIC guitar tuner.
    • Reads/records input from sound card
    • I Fourier Transform it
    • Find the Fundamental frequency.
    but my fundamental frequency does not match the note being played! :(
    I am just trying to get the Fundamental frequency to match the note for now.

    Has anyone made a Tuner is matlab before? any idea anyone?

    Cheers.


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    #2
    cornbb
    Registered Users Posts: 6,790 ✭✭✭cornbb


    I've never used Matlab but I've worked with fourier transforms before. Can I ask what note is being played and what frequency your FT is spitting out? Its possible its picking up one of the stronger harmonics instead of the fundamental. Compare the frequency its picking up against the note names on this chart:

    http://www.phys.unsw.edu.au/jw/notes.html

    If the output frequency is, say, double what you were expecting then its probably picking up a harmonic.

    For testing/debugging purposes I'd suggest using a sound source other than a guitar. A pure sine wave with a known frequency would be ideal as it has no harmonics.


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    #3
    wheatln2
    Registered Users Posts: 132 ✭✭wheatln2


    Redegg wrote:
    Ok, I am making a BASIC guitar tuner.
    • Reads/records input from sound card
    • I Fourier Transform it
    • Find the Fundamental frequency.
    but my fundamental frequency does not match the note being played! :(
    I am just trying to get the Fundamental frequency to match the note for now.

    Has anyone made a Tuner is matlab before? any idea anyone?

    Cheers.

    Hey redegg, chances are the guitar's fundamental frequency ain't being picked up. To be certain try something like this, http://www.nch.com.au/tonegen/index.html , which will just output a pure frequency which will be of some use to you perhaps?


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