Rotor craft noise cancellation system and method

Abstract

Rotor noise cancellation through the use of mechanical means for a personal aerial drone vehicle. Active noise cancellation is achieved by creating an antiphase amplitude wave by modulation of the propeller blades, by utilizing embedded magnets through an electromagnetic coil encircling the propeller blades. A noise level sensor signals the rotor control system to adjust the frequency of the electromagnetic field surrounding the rotor and control the speed of the rotor. An additional method comprises of incorporating a phase lock loop within the control system configured to determine the frequencies corresponding to the rotors and generate corrective audio signals to achieve active noise cancellation.

1 . A rotating fan system with propellers wherein said propellers include magnetic portions and wherein said magnetic portions interact with a proximal electromagnet for noise reduction wherein said propellers are rotated by a motor independent of energy generated by said proximal electromagnet and wherein said proximal electromagnet creates interference acting upon said rotation of said propellers. 
     
     
         2 . The system of  claim 1  wherein said propellers are manufactured with magnetic portions. 
     
     
         3 . The system of  claim 1  wherein magnets are attached to said propellers. 
     
     
         4 . The system of  claim 1  wherein electronic waves are input to said electromagnet to modify the movement of said propellers. 
     
     
         5 . A method for reducing propeller noise by magnetizing propellers wherein said propellers are rotated by a motor independent of energy generated by a proximal electromagnet and wherein said proximal electromagnet creates interference acting upon said rotation of said propellers and applying a magnetic field to said propellers to cancel noise. 
     
     
         6 . The method of  claim 5  wherein said propellers are manufactured with magnetic portions. 
     
     
         7 . The method of  claim 5  wherein magnets are attached to said propellers. 
     
     
         8 . The method of  claim 5  wherein electronic waves are input to said electromagnet to modify the movement of said propellers.