Active noise control includes solutions for different scenarios such as regional active noise reduction, local active noise reduction, and active noise reduction in ducts:
·Regional active noise reduction: In application scenarios such as high-speed rail carriages, adopting active noise control over large areas can effectively improve the noise environment, enhance the comfort of the riding environment.
·Local active noise reduction: For smaller local areas, active noise reduction can be achieved by using headrest.
·Active noise reduction in ducts: In response to the difficulty of low-frequency noise reduction in ventilation pipelines, the system has good low-frequency noise reduction effect, small pressure loss, and small volume.
Active noise control mainly consists of controller and electro-acoustic components. The surrounding noise is collected through highly sensitive microphones, and the internal processor calculates and generates a sound wave that is completely opposite to the noise emitted through the speaker. The two types of sound waves, which are 180 ° in shape, cancel out each other, and the amplitude of the noise will be greatly attenuated, achieving the purpose of noise reduction.
·Suitable for automobiles, airplanes, high-speed trains, etc.
·Reduce noise in the target area by 5-12dB;
·CRRC Tangshan Locomotive and Rolling Stock Co., Ltd;
·China Academy of Railway Sciences;
·CRRC Changchun Rail Transit Co., Ltd;
·Institute of Military Medicine, Academy of Military Sciences;
·714 Research Institute of China Shipbuilding Industry Corporation;
