Bandpass sampling is a regular technique used in the RF world to mix down a signal to its final IF or baseband frequency, digitally. In this case, you are under

Bandpass sampling is a regular technique used in the RF world to mix down a signal to its final IF or baseband frequency, digitally. In this case, you are undersampling but using a well defined signal that you have apriori knowledge of where it is before and after sampling. https://en.wikipedia.org/wiki/Undersampling#:~:text=In%20signal%20processing%2C%20undersampling%20or,able%20to%20reconstruct%20the%20signal https://en.wikipedia.org/wiki/Undersampling#:~:text=In%20sig....