This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
FM Message and Modulated Signals.svg graph showing an FM modulated signal with the original message signal The modulating message and carrier signals are given respectively as xm left sin cos cos rightxc cos pi fc fc cos left pi int left fc xm tau fDelta right tau right fDelta selfmade in Inkscape Inductiveload Modulating