[LAD] Listing lowest and highest frequencies in a track?

Arnold Krille arnold at arnoldarts.de
Tue Sep 4 19:37:40 UTC 2012

On Tue, 28 Aug 2012 12:52:24 +0100 Harry van Haaren
<harryhaaren at gmail.com> wrote:
> I use Fons' JAAA for this. It has a "freeze" button, so when you hear
> a low note, you'll see it, then hit freeze, then there's peak
> analysers that you can place on the display, and it'll tell you its
> Hz (and estimate a note). dB can be read right off the Y axis.

Better use japa and then use the setting where the line isn't going
down (or is going down _very_ slowly). Use the accuracy as you like.

But somehow I suspect the "lowest frequency" will be some kind of
rumbling noise from either a mic stand or from some synths/effects
unwanted subharmonics. You should set a minimum amplitude below you
ignore a frequency as "lowest frequency". If you don't do it, you are
limited by 1/(2*window_length). And given that you have a) noise in
every recording/audio and b) a single almost delta-peak will have all
frequencies, you will also have frequencies down to the minimum
detectable by fft...

Have fun,

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