| 摘要 |
The invention concerns a pneumatically driven loudspeaker comprising a first chamber (2) having higher pressure than the surroundings (3), where the first chamber has a first opening (6) to the surroundings, and a second chamber (4) having lower pressure than the surroundings (3), where this second chamber has a second opening (9) to the surroundings, whereby the first (6) and the second (9) openings by means of valve mechanisms alternately open and close at a selected frequency, since the valve mechanism consists of at least one flap-like element (5) which with the said frequency swings to and fro, thereby alternately opening and closing both the first opening (6) and the second opening (9).
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