A Weighted Noise Active Control Method Based on Offline Reconstruction of Secondary Paths

A secondary channel, active control technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of increased hardware cost, increased calculation amount, difficult to guarantee effect, etc., to achieve the effect of improving noise reduction bandwidth and noise reduction.

Active Publication Date: 2021-02-02
TONGJI UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the digital filter design process is complicated and the effect is difficult to guarantee; on the other hand, the problems of increased calculation and hardware cost introduced by the use of digital filters are unavoidable

Method used

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  • A Weighted Noise Active Control Method Based on Offline Reconstruction of Secondary Paths
  • A Weighted Noise Active Control Method Based on Offline Reconstruction of Secondary Paths
  • A Weighted Noise Active Control Method Based on Offline Reconstruction of Secondary Paths

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Embodiment

[0053] Such as figure 1As shown, this embodiment provides a weighted noise active control method based on secondary channel offline reconstruction, including the following steps:

[0054] 1) Measure the transfer function of the secondary path;

[0055] 2) Determine the evaluation standard for active noise control - the minimum A-weighted sound pressure level;

[0056] 3) Use the sound pressure A-weighting curve to reconstruct the secondary channel offline;

[0057] 4) Apply the reconstructed secondary pathway to the existing active noise control system;

[0058] 5) Re-matching the system parameters to achieve the best effect of weighted noise active control.

[0059] Such as figure 2 Shown is the schematic diagram of the noise active control system of this embodiment, wherein is the secondary path transfer function of this embodiment.

[0060] Step 1) The result of measuring the transfer function of the secondary path is as follows Figure 5 shown by the solid line. ...

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Abstract

The invention relates to a weighted noise active control method based on secondary path offline reconstruction, comprising the following steps: 1) obtaining the original secondary path transfer function x(n) of the noise active control system; 2) determining the weight of the noise signal form, and obtain the unit impulse response h(n) of the system function of the noise signal in the determined weighted form, and use the response h(n) as a weighted filter; 4) replace the original secondary path transfer function with the secondary path transfer function after the reconstruction; 5) re-match the parameters of the noise active control system to achieve the best weighted noise active control Effect. Compared with the prior art, the present invention has the advantages of quickness, convenience, improved noise reduction amount and noise reduction bandwidth, no increase in calculation amount and hardware investment, fast parameter matching and the like.

Description

technical field [0001] The invention relates to the field of noise active control, in particular to a weighted noise active control method based on secondary path offline reconstruction. Background technique [0002] Noise active control (noise active control) technology is to generate a sound wave with the opposite phase to the primary noise through a series of operations, so that it can be superimposed with the primary noise to achieve the purpose of noise elimination. The algorithm principle is as follows: figure 2 shown. Although, this technology has been widely used in active noise reduction in headphones, airplanes, cars, etc. However, typical active noise control systems do not have the ability to control weighted noise. Typical noise reduction effects are as follows: image 3 shown. Depend on image 3 (Left) It can be seen that the noise spectrum after denoising is relatively flat, but this does not match the auditory characteristics of the human ear. Considerin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/178
CPCG10K11/17817G10K11/1785
Inventor 孟德建张希玉张立军
Owner TONGJI UNIV
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