A Method of Sound Field Control Using Beam Deflection

Due to the energy conservation law, traditional active noise control system cannot realize the suppression of omnidirectional sound field and will bring fluctuation effect in the far field. This paper presents a method of sound field control using beam deflection to overcome the shortcomings of traditional active noise control system. The principle of beam deflection is firstly derived based on the principle of beam forming. Two methods including conventional beam deflection and optimal beam deflection are proposed. Then technical route of the sound field control using beam deflection is given. Finally, simulations are performed and the results show that proposed method can effectively suppress the energy of a controlled sound source in the predetermined direction.