The process of varying the AMPLITUDE of a sound, often periodically. An example of AM is the violinist's TREMOLO, where the amplitude of the vibrating string is rapidly altered by a movement of the ...

Modulation is the act of translating some low-frequency or baseband signal (voice, music, and data) to a higher frequency. Why do we modulate signals? There are at least two reasons: to allow the ...

Researchers use graphene metamaterial to create terahertz modulators with record depth and speed, opening new possibilities for communications, imaging, and sensing. (Nanowerk News) Researchers at the ...