Patent ID: 7017707

Claim:
A method of designing a Herschel-Quincke tube arrangement comprising the steps of: a) representing a tube arrangement including a first passageway and second passageway fluidly connected to the first passageway at first and second junctions, the second passageway divided by the junctions into first, second, and third passages; b) associating lengths with each of the first passageway and the first, second, and third passages producing a particular length combination; c) calculating a filter parameter for the particular length combination based upon a target frequency range; d) associating other lengths with each of the passageway and the first, second, and third passages producing another particular length combination; e) calculating another filter parameter for the other particular length combination based upon the target frequency range; and f) selecting one of the length combinations for the Herschel-Quincke tube arrangement based upon desired parameters including the filter parameters.