Acoustic impedance inducing device

Details Acoustic impedance inducing device Acoustic impedance inducing device

1988-08-25

1989-06-20

Fuller, B. R.

Acoustics

Sound-modifying means

181185, 84392, 84453, G10D 900, G10K 1100

Patent

active

048402508

ABSTRACT:
An acoustical impedance inducing device is created for axial insertion into the longitudinal air column of a wind musical instrument. The device includes a first annular band of first predetermined thickness and a second annular band of approximately twice the thickness of the first band. A first web interconnects the first and second bands and maintains the bands at a predetermined axial spacing. The web is formed of strips diagonally disposed between the first and second bands and defining a triangle shaped aperture between adjacent bands, with the base of the triangle being colinear with an edge of one of the first and second bands. A third annular band, twice the thickness of the second, may be separated from the second band by a second web; or the device may be placed in a tubular portion of the instrument at a location where an end of the tubular portion is spaced from the second band by the axial width of the web.

REFERENCES:
patent: 842707 (1907-01-01), Rose
patent: 872592 (1907-12-01), Wangemann
patent: 1770234 (1930-07-01), Grost
patent: 3973464 (1976-08-01), Novy
F. C. Karal, "The Analogous Acoustical Impedance For Discontinuities and Constrictions of Circular Cross Section," The Journal of the Acoustical Society of America, Mar. 1953.

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