Hello
We are using ICS43432 microphone to make some audio measures.
We use an external source to calibrate the microphone (94dB 1kHz).
The I2S sampling rate is 32kHz
I join the FFT to the topic.
As you can see, we have 1kHz harmonics.
When we use 44.1kHz, these harmonics disappear.
As soon as we don't use a frequency not multiple of 44.1, we see this kind of harmonics appearing.
Looking at the audio waveform, it seems the microphone makes some downsampling or oversampling.
Is it a known case?
Thanks for your help
The attachment.