| 摘要 |
A magnetic coil is described. In an example, an apparatus comprises a layer of porous material and a magnetic coil. The layer of porous material comprises openings configured to pass sound waves through the layer and capture particles having a larger dimension than a width of any of the openings. The magnetic coil is configured on the layer, wherein a signal line of the coil is configured to conform to a shape of the layer so that the signal line is configured on the layer. The coil is configured to change a magnetic field of a transducer and change an orientation of the particles so as to capture the particles on the layer. In other examples, a method and a loudspeaker are described. |
