Pinpoint Active Noise Control Using Audio Spot Generated with Multiple Parametric Speakers

We have been investigating the possibility of controlling noise using active noise control (ANC) technology. We proposed a novel ANC structure which uses Audio spotlights (AS) with subdivided AM sideband as the secondary source. The secondary sound source, which cancels noise, is only generated within the spotlight. We compared the efficiency of the proposed ANC with ANC that uses a conventional parametric array speaker (PAL) that delivers secondary source in a beam, and found that the proposed ANC can cancel noise only in a limited area, while additional noise is not introduced in the surrounding area.