Finger Board Radius A guitar pickup is actually just like a dynamic mike coil. For decades, powerful microphones have now been sent with the voice coil attached to the primary of the microphone's transformer, and not referenced to ground (‘floating'). The microphone's case is typically connected to the cable guard, which can be attached to the microphone amplifier's surface (see Rane's website for more discussion).
By and big, dynamic microphones are extremely calm products as a result of the mixture of transformer isolation and balanced, suspended transmission lines all through, in addition to shielded, humbucking coils.
So why not guitars? Instruments are notoriously affected by noise. Humbucking pickups are merely an incomplete (though essential!) solution. Well-known alternative is to move the guitar pickup to a balanced result, being a microphone. A similar idea was printed that 2001 patent program such as Finger Board Radius?