Lynyrd Skynyrd Free Bird A guitar pickup is actually just like a vibrant mike coil. For many years, active microphones have been wired with the voice coil attached to the primary of the microphone's transformer, and perhaps not introduced to surface (‘floating'). The microphone's situation is typically linked to the cable shield, which can be attached to the mike amplifier's surface (see Rane's internet site for more discussion).
By and large, dynamic microphones are very quiet devices as a result of the mixture of transformer solitude and healthy, hanging indication lines through the duration of, in addition to protected, humbucking coils.
Therefore why don't you instruments? Instruments are once affected by noise. Humbucking pickups are just an incomplete (though crucial!) solution. The obvious solution would be to float the guitar collection to a healthy result, being a microphone. An identical strategy was published this 2001 patent application like this Lynyrd Skynyrd Free Bird?