| 摘要 |
<p>Aloudspeakerbased on a dipole element (DE) with at least one diaphragm arranged to generate an acoustic dipole signal according to an electric signal, e.g. a dedicated dipole driver such as an Air Motion Transformer or a combination of two monopole drivers, e.g. dome tweeters,mounted back to back close together. An acoustic waveguide (WG) is arranged in relation to the dipole element (DE) such that a surface (S) of the acoustic waveguide (WG) is close to the at least one diaphragm of the dipole element (DE). The acoustic waveguide (WG) extends in both directions of a main axis (MA) of the dipole element (DE), thus serving to guide the acoustic dipole signals away from the dipole element (DE). Preferably, the surface (S1, S2) of the acoustic waveguide (WG) has ageneral tilt of less than 30° in relation to the main axis (MA). Thereby, a diffuse sound field is provided with only a limited requirement for housing the acoustic waveguide (WG) in the depth dimension. A smooth sound radiation for directions away from on-axis is provided, and sound radiationon-axis is highly suppressed. With these properties the loudspeaker is suited as back or surround loudspeaker in surround sound systemsto cover midrange and/or upper audio frequencies.</p> |
