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1. (physics) The phenomenon of a signal's amplitude
Definition:
The volume (Amount) of a signal, electrical, optical or acoustic. increasing when its frequencyDefinition:
A value, expressed in Hertz, that indicates how many cycles of a periodic signal occur in one second. is close to the natural frequency of a system of which it is a part, or on which it acts. 2. (filter) A control that increases amplitude at whatever frequency is selected.
