Get the frequency from an AudioSource

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Hey!

I am trying to make a game where I use my guitar as controller. (I know unity isn't the best for this) I figured out some stuff and now I can use my guitar as Input. But is there a way to get the input frequency from a mic or from a Audiosource? (for the people that ask why I would want the frequency, I want to use it to check if I hit a certain note).

Thanks :)

Answer 1

@danivdwerf I've had some luck with this by using AudioSource.GetSpectrumData. It transforms the most recently played audio samples from the time domain to the frequency domain, so what you get is an array populated with bins of frequency values from 0Hz - the sampling rate (which can be retrieved from AudioSettings.outputSampleRate) / 2, split by the length of the array you provide. So if you provided an array with a length of 1024, and your sample rate was 48000Hz, your maximum returned frequency would be 24000Hz and each index of the array would represent a frequency chunk of ~23Hz.

If you're running your live microphone input into an AudioSource like so: https://docs.unity3d.com/ScriptReference/Microphone.Start.html

This method should work well for you.

I have a more in-depth article where I go through more examples and provide a bit more clarity, but this short description should get you on the right track. If you want to check out the article it's here: https://medium.com/giant-scam/algorithmic-beat-mapping-in-unity-intro-d4c2c25d2f27

Get the frequency from an AudioSource

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