Noise-cancelling wall

摘要

A noise-cancelling wall is described that includes a height, a width, a depth, and first and second portions. The first portion has a first characteristic acoustic wavelength and a first thickness along the depth, and the second portion has a second characteristic acoustic wavelength and a second thickness along the depth. A relationship between the first and second portions is such that twice a difference between a ratio of the first characteristic acoustic wavelength to the first thickness, and a ratio of the second characteristic acoustic wavelength to the second thickness ranges from 0.25 above an odd integer to 0.25 below the odd integer. The first portion causes an acoustic phase shift of sound waves passing through the first portion relative to sound waves passing through the second portion, and the phase shift results in destructive acoustic interference between sound waves traveling through the wall.

主权项

1. A noise-cancelling wall comprising:
a height, a width, and a depth; a first portion having a first characteristic acoustic wavelength and a first thickness along the depth; and a second portion having a second characteristic acoustic wavelength and a second thickness along the depth, wherein a relationship between the first and second portions is such that twice a difference between a ratio of the first characteristic acoustic wavelength to the first thickness, and a ratio of the second characteristic acoustic wavelength to the second thickness ranges from 0.25 above an odd, unitless integer to 0.25 below the odd, unitless integer, and wherein the first portion causes an acoustic phase shift of sound waves passing through the first portion relative to sound waves passing through the second portion, wherein the phase shift results in destructive acoustic interference between sound waves traveling through the wall.