To reiterate that time: envision sampling the upper spectrum these that the new sampling level is at 50 % of $f_ s1 $, proper in the center of your "superior frequency" spectrum components we depicted. Meaning then that the spectrum centered concerning this new sampling charge need to then be https://share.evernote.com/note/91c6354d-2887-12d0-6d41-1b26614dcfdf