US 7,623,670 B2 · Waveguide electroacoustical transducing

Abstract

A waveguide system for radiating sound waves. The system includes a low loss waveguide for transmitting sound waves, having walls are tapered so that said cross-sectional area of the exit end is less than the cross-sectional area of the inlet end. In a second aspect of the invention, a waveguide for radiating sound waves, has segments of length approximately equal to A ⁡ ( y ) = A inlet ⁡ [ 1 - 2 ⁢ Y B + ( y B ) 2 ] where l is the effective length of said waveguide and n is a positive integer. The product of a first set of alternating segments is greater than the product of a second set of alternating segments, in one embodiment, by a factor of three. In a third aspect of the invention, the first two aspects are combined.

Claims14

Dependent claims

An acoustic device, comprising:

a low loss tapered acoustic waveguide enclosed by unbroken walls, the waveguide comprising
a first end for coupling the waveguide to an electroacoustical transducer;
and
a second end for radiating acoustic energy directly to free air, positioned a distance away from the first end;
wherein the walls are tapered over at least a portion of their length so that the cross-sectional area at the second end is less than the cross-sectional area at the first end and wherein the lower limit frequency of the bass range of the acoustic device is substantially the same as the lower limit frequency of a straight walled waveguide of equivalent volume and a corresponding distance of at least 1.3 times the distance of the tapered acoustic waveguide.

2 more elements

Dependencies are inferred from the claim text.

Waveguide electroacoustical transducing

Life of this patent

Waveguide electroacoustical transducing

Life of this patent

Abstract

Claims14