Cordless Microphone Headset A guitar pickup is basically much like a vibrant mike coil. For many years, dynamic microphones have now been sent with the voice coil attached to the primary of the microphone's transformer, and perhaps not referenced to surface (‘floating'). The microphone's case is usually linked to the wire guard, that is connected to the mike amplifier's surface (see Rane's site for more discussion).
By and large, active microphones are extremely quiet devices as a result of the mixture of transformer isolation and healthy, floating indication lines all through, as well as guarded, humbucking coils.
Therefore why not guitars? Instruments are notoriously affected by noise. Humbucking pickups are merely a partial (though important!) solution. The obvious solution would be to float the guitar pickup to a healthy result, just like a microphone. An identical strategy was printed that 2001 patent request like this Cordless Microphone Headset?