To Reiterate that time: picture sampling the upper spectrum these types of the new sampling rate is at 50 % of $f_ s1 $, suitable in the center in the "high frequency" spectrum factors we depicted. Which means then that the spectrum centered relating to this new sampling rate need https://share.evernote.com/note/ebea7c23-af75-8024-d7e5-a193c523ffba