Thanks, I haven't heard of the Goertzel algorithm.
It's a spectrum-based detection though, so it will have the same issues as other spectrum detectors. Lower notes tend to have harmonics that are stronger than the base frequency. At least on a piano. Similar issue with mid-range notes that are fading - the fundamental frequency will fade quicker than the harmonics. There's also a separate issue with detecting higher-pitch notes, because the spectrum response to these is very weak.
That is, spectrum alone is not enough to do any sort of reliable note detection. That's where I started too, but none of simple approaches worked well.
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It uses a bank filter and it also works in the browser
It's a spectrum-based detection though, so it will have the same issues as other spectrum detectors. Lower notes tend to have harmonics that are stronger than the base frequency. At least on a piano. Similar issue with mid-range notes that are fading - the fundamental frequency will fade quicker than the harmonics. There's also a separate issue with detecting higher-pitch notes, because the spectrum response to these is very weak.
That is, spectrum alone is not enough to do any sort of reliable note detection. That's where I started too, but none of simple approaches worked well.
[1] https://en.wikipedia.org/wiki/Goertzel_algorithm
There is a online demo here
https://tfhub.dev/google/lite-model/spice/1