Directional Suppression of Monotone Noises with A Parametric Array Loudspeaker

Monotone noises at high decibels have been identified as a main cause of degradation in people’s mental health. This paper proposes directional monotone noise reduction method to suppress spatially localized single-frequency noises. The system is designed based on feedforward active control (ANC) structure by implementing filtered-x least mean square (FxLMS) algorithms. Compared with traditional ANC methods, our employs parametric array loudspeaker (PAL) the noise-canceling source audio directivity for suppression. monitors ambient and implements algorithm real-time through software-based platform operating generic personal computer (PC). Experimental measurements demonstrate an 8dB different 260cm distance from source. methods voice coil (VCL) source, PAL-based achieves similar suppression performance 5.8 times improvement source-to-target 64% −3dB lobe beam width. results prove advantage introducing PALs active-noise-canceling sources cost-effective enhancement distances directivities.