Noise reduction device suitable for small space

• Main Authors: YU TIANTIAN, GAO HAIYANG, XUE QIUMENG, BU LINGBING, HUANG XINGYOU, YAN WENHUI, WANG CHAO, YU LIYAO, WANG ZHEN
• Format: Patent
• Language: English
• Published: 13.05.2015
• Subjects: ACOUSTICS; ACOUSTICS NOT OTHERWISE PROVIDED FOR; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; MUSICAL INSTRUMENTS; PHYSICS; SOUND-PRODUCING DEVICES

The invention discloses a noise reduction device suitable for a small space. The noise reduction device suitable for the small space comprises a noise reduction control circuit and a support, wherein the noise reduction control circuit comprises a noise collection unit, a signal amplification unit, a first filtering unit, and A/D (analog to digital) conversion unit, a controller unit, a D/A (digital to analog) conversion unit, a second filtering unit, an audio power amplifier and an inverse phase noise output unit, which are sequentially connected, the support comprises a chassis and at least one group of upper layer supports connected with the chassis, an output port and an input port are formed in the chassis, the input port is located in the middle of the chassis, the output port is located on the edge of the chassis, circuit boards of the noise reduction control circuit are installed on the upper layer supports, the noise collection unit in the noise reduction control circuit is arranged at the position of the input port in the chassis, and the inverse phase noise output unit is arranged at the position of the output port of the chassis. The noise reduction device suitable for the small space can effectively reduce low and middle frequency noise which enters the small space from an external environment based on characteristics of an active noise control technology, and thereby effectively improves an acoustics environment in the small space.