Acoustic device
OwnerDavid Wishinskyinventor
Life of this patent
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Abstract
In an acoustic horn of the type wherein a resiliently flexible membrane is stretched across an edge of a tube and vibrated by pressurized fluid forced between the tube edge and a first surface of the membrane into the tube, a positionally adjustable end cap is disposed over the membrane to permit the frequency of vibration of the membrane to be adjusted as a function of the position of the end cap relative to the membrane. The end cap position selectively limits the amount of displacement of the membrane. In addition, the end cap positional adjustability permits selectively control of the force urging the membrane against the tube edge in opposition to the pressurized fluid.
Claims27
In an acoustic device wherein a resiliently flexible membrane having a first surface and a second surface is stretched across an edge of a tube and vibrated by pressurized fluid forced between said tube edge and said first membrane surface, an improvement comprising:
- a positionally adjustable member disposed proximate said second surface of said membrane to permit the frequency of vibration of said membrane to be adjusted as a function of the position of said member relative to said membrane.
A method of generating sound in an acoustic device of the type in which a resiliently flexible membrane including a first surface and a second surface is stretched across an edge of a tube and is vibrated by pressurized fluid forced between said tube edge and said first membrane surface and into said tube, said method comprising the step of:
- selectively positioning an adjustable member proximate said second membrane surface to permit the frequency of vibration of said membrane to be adjusted as a function of the position of said member relative to said membrane.
An acoustic device comprising:
- an outer tube including
- an exterior surface, and
- an interior surface that defines a channel extending from a first open end to a second closed end;
- an inner tube including
- an exterior surface, and
- an interior surface that defines a channel extending from a first open end to a second open end, wherein said inner tube is substantially coaxially disposed within said outer tube to define a generally annular gap between said outer tube interior surface and said inner tube exterior surface;
- a membrane operable to vibrate at audible frequencies including a first surface and a second surface, wherein said membrane first surface contacts said first open ends of said tubes;
- and
- a repositionable member disposed over said membrane second surface, wherein said member is operable to adjust the frequency of vibration of said membrane.
Dependencies are inferred from the claim text.