Acoustical treatment with transition from absorption to diffusion and method of making

摘要

The essence of the present invention is that the thickness of a diffusive fascia of an acoustical treatment is directly correlative of the transition frequency between absorption and pure diffusion. Applicant has found that the thicker the fascia, the lower the transition frequency. For a fascia 600 microns thick, the transition between absorption and diffusion is at about 250 Hz; for a fascia having a thickness of 300 microns, the transition frequency is at about 500 Hz; for a micro-perforated fascia having a thickness of 150 microns, the transition frequency is at about 1,000 Hz; for a fascia having a thickness of 100 microns, the transition frequency is at about 2,000 Hz. An acoustical treatment is created taking these criteria into account. A method of making is also disclosed.

主权项

1. An acoustical treatment comprising:
a) a thin fascia having a forward facing surface having a surface configuration acting as a sound diffusor, said forward facing surface being configured as a 1D or 2D diffusor; b) said fascia having a rearward facing surface, said acoustical treatment including a sound absorbing core rearward of said rearward facing surface, said core absorbing sound waves entering said core after traveling through said thin fascia; c) said fascia having a thickness determinative of a transition frequency between absorption and diffusion, a greater thickness resulting in a lower transition frequency and a lesser thickness resulting in a higher transition frequency.