| 摘要 |
<p>A high-volume source for very low frequency applications in which conventional speakers are inadequate is disclosed. A presently preferred embodiment comprises a reservoir (32) with a pressure relief (33); a controller (34); a supply blower (36); an exhaust blower (38); a positive plenum (40); a negative plenum (42); an orifice plate with valving (44); a horn (46); and pressure transducers (48, 50, 52, 54), feeding detected pressure levels to the controller (34). An electrical command signal s(t) is also input to the controller. The command signal is a voltage analogous to the acoustic pressure or volume velocity to be output by the source.</p> |
