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low pass filter using matlab

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ayyoub
ayyoub on 12 May 2020
Edited: ayyoub on 12 May 2020
hey guys i have original signal with 3023 hz frequency , after adding 128 zeros between samples , i want to create low pass filter half band or using FIRPM for filtering my signal_fir1 , how i can do it
f = 3023;
fac1=128
fs1 = 48000;
nT = [0:1/fs1:1];
signal = sin(2*pi*f*nT);
signal_fir1=zeros(1,fac1*length(signal));
signal_fir1([1:fac1:end])=signal;

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