| 摘要 |
The present invention is directed toward an acoustic system for producing sounds over a broad range of frequencies. The acoustic system includes an enclosure, a speaker that is acoustically connected to the enclosure, for genera ting, almost simultaneously, two sounds, a forward sound, and a rearward sound. It further includes a waveguide enclosed at least partly within the enclosure, and acoustically connected to the speaker, for defining an acoustic path along which one of the forward or rearward sounds travels. The waveguide includes a pluralit y of inner panels that are positioned inside the enclosure for optimizing the leng th of the acoustic travel path. The inner panels and the enclosure defining a pluralit y of inner passageways have generally similar cross-sectional surface areas, and a plurality of inner openings, cause a selective cancellation of sounds at predetermined frequencies, while preserving sounds at other frequencies. The present acoustic system design has numerous commercial applications. For instance, it can be used in conjunction with ultra sound and sonar systems, hear ing aids, stethoscopes, microphones, telephones, hearing aids, and noise cancellatio n devices, radios, etc.
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