If you want to go really deep down the rabbit hole, Oppenheim's MIT OCW lecture/text are basically the signals bible. Oppemheim's text is clear and lucid -- an

If you want to go really deep down the rabbit hole, Oppenheim's MIT OCW lecture/text are basically the signals bible. Oppemheim's text is clear and lucid -- and he was Bose's student to boot! https://ocw.mit.edu/resources/res-6-007-signals-and-systems-spring-2011/ https://ocw.mit.edu/resources/res-6-007-signals-and-systems-... come for the wisdom, stay for the 80s polyester ties.