| 摘要 |
A wave-guide acoustic transformer is described, comprising: a membrane (4) having a cylindrical shape open at its sides, used as sound wave guide and omnidirectional acoustic passive radiator, a loudspeaker (3) adapted to send sound waves (7) inside the cylindrical membrane (4), an acoustically reflecting circular plug (5), a gasket (6) with the housings of the screws to be used for supporting the loudspeaker; the cylindrical membrane (4) receives energy only from the sound wave fronts traveling in the internal air volume and has a strongly anisotropic modulus of elasticity in parallel with the cylinder axis and along the circumference of the cylinder itself, the internal sound waves (7) not modifying the length of the cylinder since, along the axis, the elastic constant is very high, the internal sound waves (7) themselves being adapted to modify the circumference of the cylindrical membrane (4) since, along the circumference, the elastic constant is much lower. |
