I am trying to improve my DSP knowledge and this problem is too much for me. I am trying to solve following task: enter image description here
this is not a homework. any help will be appreciated.

  • $\begingroup$ Which book it is from? Take the frequency domain approach to solve this.. $\endgroup$
    – Oliver
    Apr 20, 2015 at 2:53
  • $\begingroup$ Equations are fairly straightforward. Your filter gain should be equal to $L$, cutoff frequency is always defined as $\omega/L$ and re-sampled frequency is $f_2=f_1\cdot L/M$. $\endgroup$
    – jojek
    Apr 20, 2015 at 22:37
  • 1
    $\begingroup$ @jojek: will you be post comment as the answer? i can accept it $\endgroup$ Mar 16, 2016 at 8:48


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