Re: [LAU] spectrum analyzer to visualize harmonics

From: Gabriel M. Beddingfield <gabrbedd@email-addr-hidden>
Date: Mon Mar 11 2013 - 02:55:16 EET

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

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Received on Mon Mar 11 04:15:01 2013

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