– what is the fast Fourier transform in relation to audio processing?
In: 7
I find this picture helpful:
https://www.nti-audio.com/portals/0/pic/news/FFT-Time-Frequency-View-540.png
As you can see, it takes all the frequencies that are appearing and shows it as amplitude.
FFTs are popular for measuring audio gear as distortion is just unwanted frequencies besides the frequencies you want, so if you play a 1kHz tone, any other tones showing up will be distortion.
[Here is an FFT of a speaker amplifier with low distortion](https://www.audiosciencereview.com/forum/index.php?attachments/topping-la90-measurements-low-gain-integrated-amplifier-high-performance-png.202314/)
[Here is an FFT of a speaker amplifier with high distortion](https://www.audiosciencereview.com/forum/index.php?attachments/smsl-sa100-bluetooth-amplifier-audio-measurements-png.37977/)
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