Archives of Acoustics, 6, 2, pp. 135-146, 1981
The blurred cut-off frequency of acoustic horns
On the basis of discussion of the Webster equation the conditions and possi¬bilities of a blurred cut-off frequency for horns of arbitrary geometry were analyzed. The transmission properties of horns in the blurred region were discu¬ssed. Subsequently the blurred cut-off frequency was considered for hyperbolic horns of annular cross-section.
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