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FIR Multirate processing Adau1452

Question asked by Freddy072 on Apr 21, 2017
Latest reply on Apr 27, 2017 by Freddy072



I just tried using the new multirate blocks. Intention is to use downsampling, "short" FIR filter and upsampling.


I created a notch filter at 25Hz with ridiculous high Q and gain at 12kHz sample rate. See the rephase window. If I insert this in sigma studio with 48kHz core sample rate I get of course a notch filter for 100Hz. However: the same filter with down- and upsampling blocks shows the same. But this should show the correct result with a notch filter at 25Hz.


Can you please tell me where is my misunderstanding?