An active noise reduction system and method for a tower air cleaner
An air purifier and active noise reduction technology, applied in applications, sensors, heating methods, etc., can solve problems such as tower air purifier noise, and achieve the effect of fast noise elimination, easy implementation and good noise elimination performance.
Active Publication Date: 2020-07-03
HUITING ACOUSTICS TECH BEIJING CO LTD
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[0004] In order to solve the noise problem of tower-type air cleaners, an easy-to-implement feed-forward filter is designed on the basis of a comprehensive description of the noise transfer characteristics. The present invention proposes an active noise reduction system and method for tower-type air cleaners
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[0015] In order to further understand the technical solutions and advantages of the present invention, the present invention will now be described in detail with reference to the drawings and embodiments.
[0016] The invention relates to an active noise reduction system for a tower-type air cleaner. The noise reduction system includes a noise detection device, a noise reduction unit and a noise reduction device. The noise detection device includes two microphones and a vibration sensor. The noise reduction unit includes an analog / digital conversion circuit, two feedforward filters and a digital / analog conversion circuit; the noise elimination device is a loudspeaker. Two microphones are respectively placed near the noise source and near the speaker to collect noise signals. The vibration sensor is placed near the noise source to collect the vibration signal corresponding to the noise signal. The analog / digital conversion circuit converts the noise signal and vibration signa...
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The invention discloses an active noise reduction system and method used for a tower type air purifier. The noise reduction system comprises a noise detection device, a noise reduction unit and a noise removing device; the noise detection device comprises a microphoneand a vibration sensor; the noise reduction unit comprises an analog-digital conversion circuit, a feedforward filter and a digital-analog conversion circuit; the noise removing device is a loudspeaker; the active noise reduction method comprises the steps that the microphone and the vibration sensor are used for detecting a noise signal and a vibration signal; according to the signals, the transmission characteristic of the noise is determined, according to the noise transmission characteristic, the feedforward filter is designed, a noise removing signal is obtained from the noise signal and the vibration signal through the feedforward filter, and the loudspeaker plays the noise removing signal to achieve noise removing. According to the active noise reduction method for the tower type air purifier, the good noise reduction effect can be obtained, and the air purifier purifies indoor polluted air and meanwhile sends out little noise.
Description
technical field [0001] The invention belongs to the technical field of voice signal processing, and in particular relates to an active noise reduction system and method for a tower-type air purifier. Background technique [0002] In recent years, smog has been a hot topic of environmental pollution among the people, and people have gradually realized that being in the smog environment for a long time will cause great harm to the body, ranging from respiratory diseases to cancer. For this reason, in haze weather, people reduce going out on the one hand, and wear professional protective masks when going out; harm. However, air purifiers will bring noise pollution while purifying the air. When most air purifiers operate at high power, the noise exceeds 50dB. Working and living in such a noisy environment for a long time is not conducive to people's physical and mental health. [0003] In order to eliminate environmental noise, there are usually two methods of passive noise r...
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IPC IPC(8): F24F13/24H04R3/00
CPCF24F13/24F24F2013/247H04R3/00
Inventor 虞安波
Owner HUITING ACOUSTICS TECH BEIJING CO LTD