Accessing amplitude data in the frequency domain

Help
,
#1

Hello,

Question/Issue:
Using MFE to finally classify a low frequency monotonic sound on ESP32 (similar to the “running faucet” example), I also want to assess the amplitude (strength/energy) of the target frequency after detection.

I understand the final goal is classification in varying environments and that the amplitude isn’t that relevant to the process (AFAIU). But still, since the DSP stage is already deconstructing the time domain into the frequency domain, and since the computational resources are limited by definition, is there a quick-and-dirty way to manually arrange a callback (similar to signal_t.get_data) with some kind of reference to data which allows amplitude evaluation in the frequency domain?

Thank you in advance!

#2

Hi @superware

You can also use MFCC feature extraction to deconstruct the time-domain signal into its frequency components, you can access the spectral energy corresponding to specific frequencies.

You can also explore our performance calibration Post processing

Best

Eoin