[LAU] spectrum analyzer to visualize harmonics

[Gabriel M. Beddingfield]

On 03/10/2013 05:08 PM, Federico Bruni wrote:
> I'm searching a spectrum analyzer software.
> What do you recommend?

I recommend JAPA.

> I've tried JAAA but it's not much user-friendly and there's no manual.

JAAA is for making precise engineering measurements and doesn't take 
into account how your ears work.

> I'd like to visualize the harmonics produced by a guitar string.
> How can I achieve what I see in this screenshot?
> http://kokkinizita.linuxaudio.org/linuxaudio/jaaa-pict.html

Well, that screenshot is showing a peak around 26kHz... way above what 
you can hear.  And the range you're interested in is all squashed on the 
left-hand side of the screen between 0 and 2.5kHz.

Assuming you've got a laptop with stereo in/out:

   1. Start JAPA: japa -A
   2. Mute your speakers since it outputs pink noise.
   3. Play your guitar into a mic.  You should see what you're
      looking for (limited by the quality of mic and amount of
      ambient noise).

I don't think JAPA give you a way to freeze the screen and mark a peak.

If you use JACK (-J instead of -A), you have more control over 
pink/white noise output.

-gabriel