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Harmonic calculator by emonlib

Submitted by Guest on Tue, 15/07/2014 - 16:04

Hello to the community, is there any way of calculating the harmonics from the data obtained with the library emonlib? Do you know if there is any formula?
Thank you very much to all.

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Robert Wall's picture

Re: Harmonic calculator by emonlib

Submitted by Robert Wall on Tue, 15/07/2014 - 16:29.

EmonLib will most certainly not provide you with enough data for that.

MartinR developed a spreadsheet sketch that implemented the discrete Fourier Transform, that I believe would run on an emonTx, but that did not use emonLib. I've used the same approach but with the data recorded by a soundcard.

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p8t4's picture

Re: Harmonic calculator by emonlib

Submitted by p8t4 (not verified) on Tue, 15/07/2014 - 21:40.

OK thank you very much.

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Robert Wall's picture

Re: Harmonic calculator by emonlib

Submitted by Robert Wall on Tue, 15/07/2014 - 22:34.

Oops! That post was a bit tangled. What I meant to write was: "MartinR developed a sketch that implemented the discrete Fourier Transform that I believe would run on an emonTx." I actually had it as a spreadsheet, as using 882 or 960 data points (1 cycle of mains, sampling at 44100 or 48000 samples per second) is a bit much for an emonTx.

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Robert Wall's picture

Re: Harmonic calculator by emonlib

Submitted by Robert Wall on Fri, 18/07/2014 - 11:28.

This has just come to my notice: http://www.codeproject.com/Articles/797537/Making-an-Audio-Spectrum-anal...

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