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:
AM signal. The frequency spectrum of signal from an AM radio station on the medium wave band The vertical coordinate is time the horizontal coordinate is frequency The central bright line is the radio transmitter's carrier On either side of it are the sidebands that contain the modulation the information that the radio station is