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Active noise reduction method and device

An active noise reduction and algorithm technology, applied in the field of communication, can solve the problems of lack of low-frequency harmonic noise and no effective solution, and achieve the effect of suppressing low-frequency harmonic noise

Active Publication Date: 2021-11-02
SHANDONG CHAOYUE DATA CONTROL ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the lack of easy-to-implement active noise control solutions for low-frequency harmonic noise in the prior art, there is no effective solution yet

Method used

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  • Active noise reduction method and device

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0033] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

[0034] Based on the above purpose, the first aspect of the embodiments of the present invention proposes an active noise reduction method. figure 1 What is shown is a schematic flowchart of the active noise reduction method provided by the present i...

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Abstract

The invention discloses an active noise reduction method and device, comprising: using the filter-X least mean square algorithm to establish a secondary channel model, and iterating the secondary channel model multiple times; collecting noise signals, and using spectral line interpolation to correct The FFT algorithm accurately measures the fundamental / harmonic components of the noise signal to obtain frequency information; the I / Q signal synthesis method is used to iteratively process the noise signal multiple times for the secondary channel model and frequency information to obtain the anechoic signal; After being preprocessed by the secondary channel model, it is output to the anechoic speaker, so that the anechoic signal and the noise signal are superimposed. The invention can use an active noise reduction algorithm to suppress the low-frequency harmonic noise of the cooling fan of the server.

Description

technical field [0001] The present invention relates to the communication field, and more specifically, to an active noise reduction method and device. Background technique [0002] Noise pollution is an environmental issue worthy of attention. The passive noise control method in the prior art can better suppress high-frequency noise in a wide range, but has a poor effect on low-frequency suppression, and even has almost no obvious and distinguishable noise reduction effect. In contrast, active noise control has good low-frequency characteristics and is very suitable for controlling low-frequency harmonic noise generated by rotating equipment or devices with reciprocating motion (such as server cooling fans). The energy of harmonic noise is concentrated in a limited frequency, which is a typical and common narrow-band noise. [0003] Aiming at the lack of an easy-to-implement solution for active noise control of low-frequency harmonic noise in the prior art, there is no ef...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/178
CPCG10K11/1781G10K11/1785
Inventor 于治楼齐乐李凯一王培培滕达
Owner SHANDONG CHAOYUE DATA CONTROL ELECTRONICS CO LTD