Noise reduction is the process of removing noise from a signal. Noise reduction techniques are conceptually very similar regardless of the signal being processed, however a priori knowledge of the characteristics of an expected signal can mean the implementations of these techniques vary greatly
(Noise Filtering) Cleaning the signal (AC) from any interference.
BB Antenna.
The Tokin Noise Filter GL-2080FVP core appears to be from a power supply. 8mm wire taken from that noise filter--it appears. Japan doesn't use AWG sizes for wire, but mm designations. Interesting.