Bonners Kawai Digital Piano A guitar pickup is essentially much like a dynamic microphone coil. For decades, powerful microphones have already been wired with the voice coil attached to the principal of the microphone's transformer, and not referenced to surface (‘floating'). The microphone's situation is typically linked to the cable guard, which will be linked to the microphone amplifier's surface (see Rane's internet site for more discussion).
By and big, active microphones are very calm units consequently of the mixture of transformer isolation and healthy, flying sign lines all through, along with guarded, humbucking coils.
So why don't you guitars? Instruments are notoriously affected by noise. Humbucking pickups are just an incomplete (though crucial!) solution. The most obvious option is always to float your guitar collection to a balanced result, just like a microphone. The same idea was published this 2001 patent software such as Bonners Kawai Digital Piano?