197297 ⎘
Details of active noise control [ANC] covered by but not provided for in any of its subgroups; Means; Physical; Resonators Active resonators
Rotor-stator blade interference noise reduction system and flying object
#2Active control of membrane-type acoustic metamaterial
#3Acoustic attenuation with adaptive impedance
#4Metamaterial
#5Device and method for reducing sound of a noise source in narrow frequency ranges