I Don T Know What To Play A guitar pickup is essentially much like a powerful mike coil. For many years, energetic microphones have now been wired with the voice coil attached with the primary of the microphone's transformer, and not referenced to ground (‘floating'). The microphone's case is usually connected to the wire guard, which is connected to the mike amplifier's floor (see Rane's website for more discussion).
By and large, powerful microphones are extremely calm units consequently of the mix of transformer solitude and healthy, hanging sign lines all through, along with guarded, humbucking coils.
Therefore why not guitars? Guitars are once overwhelmed by noise. Humbucking pickups are just an incomplete (though important!) solution. The obvious solution is always to move practicing the guitar collection to a balanced output, being a microphone. An identical strategy was printed this 2001 patent request such as I Don T Know What To Play?