Advice using FFT on the ESP32 - ESP-DSP Component

o.copleston
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Joined: Fri Aug 09, 2019 7:02 pm

Advice using FFT on the ESP32 - ESP-DSP Component

Postby o.copleston » Fri Aug 09, 2019 8:51 pm

I have been developing a sound visualisation project using the FFT function from the ESP-DSP component. Audio is captured using an INMP441 which is then passed to the FFT function.

I am getting great data for higher frequencies but low frequency input cause a bunch of unwanted data to appear at higher frequencies.

Image
The above image is my FFT's output for an input frequency of 125Hz

I've tried a Hanning window before and after the FTT but the issue still persists.

I've really been struggling with the ESP-DSPs lack of documentation, does anybody have experience that could share some advice?

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