| 摘要 |
<p>An apparatus comprising: a surface; at least one contact transducer, wherein the at least one contact transducer is coupled to the surface and configured to move the surface to generate at least one acoustic signal, wherein the at least one acoustic signal is configured to be transmitted at least by the surface; at least one acoustic enhancer configured to enhance the acoustic output of the at least one contact transducer, wherein the at least one acoustic enhancer comprises at least one further transducer configured to generate at least one further acoustic signal.</p> |
