Method for controlling active noise of portable small-flow oxygen generator

By setting precise reference distances and installation structures for speakers and microphones in the oxygen concentrator, a closed-loop control system is built to achieve active noise control, solving the problem of poor effectiveness of traditional passive noise reduction methods and improving the noise reduction effect and portability of the oxygen concentrator.

CN121838703APending Publication Date: 2026-04-10ANHUI POLYTECHNIC UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-24
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Traditional passive noise control methods for oxygen concentrators have limited noise reduction effects, increase equipment size and weight, and are difficult to meet users' needs for low noise.

Method used

Active noise control technology is adopted. By setting the precise reference distance and installation structure of the speaker and microphone, a closed-loop control system is built. Audio processing noise reduction chip and adaptive controller are used to generate anti-noise signals for noise reduction, and residual noise signal feedback is combined for optimization.

Benefits of technology

It effectively reduces the operating noise of oxygen concentrators by 25-30dB, improves user comfort, maintains the portability of portable low-flow oxygen concentrators, and ensures the stability and reliability of noise reduction effects, with noise reduction system fluctuations not exceeding ±1dB.

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Abstract

The invention discloses a method for controlling active noise of a portable small-flow oxygen generator, and the method comprises the following steps: S1, improving an oxygen generator model, and adding a fixing device for placing a loudspeaker and a microphone; s2, determining that the distance between the reference sensor and the error sensor is 60mm, and the distance between the loudspeaker and the error sensor is 5mm; s3, building an active noise control platform according to the layout of the loudspeaker and the microphone; s4, due to the fact that the propagation speed of the sound in the air is 343 m / s, the time of the reference signal propagating from the reference microphone to the error microphone is calculated to be about 0.175 milliseconds according to a formula; s5, judging the sound propagation time, wherein 0.05 ms is the time delay of the whole link of the active noise control system; and S6, installing the loudspeaker and the microphone according to the above steps, and carrying out a noise reduction test.
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