Robuta

https://www.mathworks.com/matlabcentral/answers/465106-polyphase-decimation-filter-simulink-implementation-of-commutator-variant-not-as-expected
Polyphase decimation filter: Simulink... Learn more about polyphase decimation filter MATLAB, Simulink, DSP System Toolbox
polyphasedecimationfiltersimulinkimplementation
https://www.mathworks.com/help/dsp/ref/firhalfbanddecimator.html
The FIR Halfband Decimator block performs polyphase decimation of the input signal by a factor of 2.
polyphase filterfirdecimatordecimatesignal