Godin Multiac Slim A guitar pickup is essentially similar to a vibrant mike coil. For decades, active microphones have already been sent with the style coil attached with the primary of the microphone's transformer, and not called to soil (‘floating'). The microphone's situation is normally connected to the cable shield, which is attached to the mike amplifier's soil (see Rane's site for more discussion).
By and big, energetic microphones are very calm devices as a result of the combination of transformer isolation and balanced, floating transmission lines during, in addition to protected, humbucking coils.
Therefore why not instruments? Guitars are notoriously overwhelmed by noise. Humbucking pickups are only an incomplete (though important!) solution. Well-known option is always to move your guitar collection to a healthy output, being a microphone. A similar thought was published this 2001 patent program such as Godin Multiac Slim?