Re: [LAU] spectrum analyzer to visualize harmonics

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To: <linux-audio-user@...>
Date: Monday, March 11, 2013 - 12:26 pm

On Sun, Mar 10, 2013 at 05:55:16PM -0700, Gabriel M. Beddingfield wrote:

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

The README explains how to use the controls. It's minimal but everything
essential is in there.

> JAAA is for making precise engineering measurements and doesn't take

In this case (measuring harmonics) it shouldn't take your ears
into account. JAAA has a linear F axis, this is ideal for seeing
harmonics as they are all equally spaced.

> >I'd like to visualize the harmonics produced by a guitar string.

22.6678 kHz actually. It's trivial to zoom in on the range of interest,
see the second picture.

* Click on Frequency:Max, then either:

1. type the max frequency into the text entry + ENTER,
2. or use the '<' and '>' buttons.
3. or use the mouse wheel.
4. or position the mouse near the right edge, and move it
to the left while holding the right mouse button.

All parameters (the current one lights up in yellow) can be modified by
(1,2,3). Dragging the mouse (4) is possible only for the frequency and
amplitude ranges.

You'll also want to reduce the bandwidth. Click on Analyser:Bandw,
and use e.g. the mouse wheel to change it while you play some notes.

When all is set up as desired, play some notes and click 'Freeze' at
the right time. It's still possible to change the F and A ranges, set
and change markers etc. while the display is frozen.

Ciao,

--
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)

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Messages in current thread:
[LAU] spectrum analyzer to visualize harmonics, Federico Bruni, (Mon Mar 11, 12:07 am)
Re: [LAU] spectrum analyzer to visualize harmonics, Gabriel M. Beddingfield, (Mon Mar 11, 12:55 am)
Re: [LAU] spectrum analyzer to visualize harmonics, Federico Bruni, (Mon Mar 11, 9:42 pm)
Re: [LAU] spectrum analyzer to visualize harmonics, Fons Adriaensen, (Mon Mar 11, 9:53 pm)
Re: [LAU] spectrum analyzer to visualize harmonics, Fons Adriaensen, (Mon Mar 11, 12:26 pm)
Re: [LAU] spectrum analyzer to visualize harmonics, Lorenzo Cecchi, (Mon Mar 11, 12:18 am)