[alsa-devel] frequency analysis with alsa and fftw

Markus Vogl markus.vogl at gmx.net
Sun Dec 27 14:50:20 CET 2009


i have to do this in realtime (like a guitartuner) and with my "project" i
have to see the frequency shift in realtime in a terminal window.


-----Ursprüngliche Nachricht-----
Von: Jan-Benedict Glaw [mailto:jbglaw at lug-owl.de] 
Gesendet: Sonntag, 27. Dezember 2009 13:54
An: Markus Vogl
Cc: alsa-devel at alsa-project.org
Betreff: Re: [alsa-devel] frequency analysis with alsa and fftw

On Sun, 2009-12-27 13:26:31 +0100, Markus Vogl <markus.vogl at gmx.net> wrote:
> my project is to analyse the mic input frequency from my asus eepc 
> 1008ha with ubuntu 9.10  and show it in a terminal window. i would use 
> my acoustic 6 string guitar to play in front of my netbook.
> i´ve testet the howto from linuxjornal.com ..
> http://www.linuxjournal.com/article/6735
> ...but i´ve no plan to use the mic input and  then analyse it with fftw.

Why do you need to do ALSA programming in the first place? Isn't it enough
to use any given ALSA-capable audio recorder (eg. arecord) to record some
sound, convert it to raw PCM data (eg. cut off the WAV
header) and then shift all the data into the FFT lib?


      Jan-Benedict Glaw      jbglaw at lug-owl.de              +49-172-7608481
 Signature of:                            If it doesn't work, force it.
 the second  :                   If it breaks, it needed replacing anyway.

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