Patent ID: 8208651

Claim:
A noise reduction system for actively blocking a noise source for a means of transport, wherein the noise reduction system comprises: at least one counter sound source; and at least one intensity sensor; wherein the at least one counter sound source and the at least one intensity sensor are arranged in a measuring region; wherein in the measuring region, the intensity sensor is adapted to measure the noise intensity of the noise source and the counter sound intensity of the counter sound source; wherein based on the measured noise intensity and the counter sound intensity, the counter sound source is controllable such that the sound energy input of the noise source can be globally reduced by the counter sound source by reducing the sound energy input in front of the noise source; wherein the at least one intensity sensor is installed, in the direction of the sound propagation from the noise source, behind the at least one counter sound source; wherein the counter sound source is adapted to provide the direction of sound propagation of the counter sound source in the direction of the noise source towards the noise source; and wherein the intensity of the noise source and the intensity of the counter sound source are directed opposite to each other.