Noise barrier

A noise barrier, comprising:

• a front wall which defines a first exterior surface of the noise barrier, the first exterior surface being configured to face a noise source area,
• a rear wall which defines a second exterior surface of the noise barrier, the second exterior surface being configured to face away from the noise source area,
• two opposite and spaced apart side walls which extend from the front wall to the rear wall,
• a compartment enclosed by at least the front wall, the rear wall and the two side walls, and
• a channel located spaced apart from the enclosed compartment,
• wherein the channel has an inlet for enabling a part of an approaching sound wave to enter and propagate through the channel, and an outlet through which said part of the sound wave is enabled to leave the channel so as to interfere with the original part of the sound wave that propagates above the noise barrier,
• wherein the inlet is located in the front wall and faces the noise source area, and
• wherein the outlet is located at a vertically higher level than the inlet and rearward of the front wall.