How can I create simple low pass filter for filtering out the higher frequency from the resulting output?

Hi, I am trying to remove the carrier of signal by multiplying it with another signal of same frequency as the carrier frequency of the first signal.

After multiplication I need to filter out the higher frequency element and retain the lower frequency element, for which I must use a low pass filter.

How can I implement this LPF without having signal processing toolbox available with me? Any lead would be appreciated.

Thanks, Priyanka

Answer 1

[Abhishek Ballaney]

https://in.mathworks.com/help/signal/ref/butter.html