DFSDM filter and aliasing

Hi,

I see an alias, using DFSDM (sinc3) and a PDM mic at 16kHz, while a speaker produces 1...24kHz.

The spectrogram is attached.

As I understand, the DFSDM filter has a notch at 16kHz rather than at 8kHz, and attenuates 8kHz for 12dB only.

Is it possible to configure DFSDM such way to attenuate the alias much more?

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