Wired And Wireless Keyboard And Mouse A guitar pickup is basically just like a dynamic mike coil. For decades, active microphones have been wired with the style coil attached with the primary of the microphone's transformer, and maybe not referenced to soil (‘floating'). The microphone's situation is typically attached to the cable shield, that is connected to the mike amplifier's ground (see Rane's internet site for more discussion).
By and large, dynamic microphones are very calm products consequently of the combination of transformer isolation and balanced, flying sign lines for the duration of, in addition to protected, humbucking coils.
So why not guitars? Guitars are notoriously affected by noise. Humbucking pickups are only a partial (though crucial!) solution. Well-known option is to move your guitar pickup to a balanced result, being a microphone. A similar idea was printed that 2001 patent software such as Wired And Wireless Keyboard And Mouse?