Broadband ultrathin sound absorption or sound insulation structure controlling an acoustic wave propagation path

A broadband ultrathin sound absorption or sound insulation structure controlling an acoustic wave propagation path, comprising at least one sound absorption unit or sound insulation unit, wherein each sound absorption unit or sound insulation unit comprises at least one acoustic wave focused section and at least one acoustic wave absorption section;

• each acoustic wave focused section is formed by an acoustic wave focused cavity filled with acoustic material;
• the acoustic wave focused cavity is a variable-section cavity, and isotropic or anisotropic acoustic material is filled in the variable-section cavity;
• and
• each acoustic wave absorption section is formed by an acoustic wave absorption labyrinth passage filled with sound absorption materials;
• the acoustic wave absorption labyrinth passage is a labyrinth-shaped simply connected passage with a closed or open end, and the passage communicates with the acoustic wave focused cavity of the acoustic wave focused section;
• in each sound absorption unit or sound insulation unit, the acoustic wave absorption labyrinth passages are closely arranged through the measures of circuitry, bending, coiling or stacking in a monolayer or multilayer or spatial spiral structural form, and occupy whole of available space outside the acoustic wave focused sections.