Active noise reduction method for spatial field

Abstract

According to the invention, the surrounding noise distribution and change features of all points are collected so as to simulate and build a whole noise sound field model shown in the description, wherein the noise field sound model is a group of continuous functions in a three-dimensional space and comprises the sound features of each frequency. The method comprises the steps: calculating the coefficients of basis functions of the noise sound field model; constructing a model of one noise reduction sound model according to the current controller parameters, carrying out the preliminary noisereduction with the noise sound field, and then calculating the energy of the whole space according to the collected noise sound field model. The coefficients of basis functions of the noise sound field model are combined for designing the controller parameters under the condition that the overall energy is minimum, and then the sound field model counteracting the noise sound field is constructed according to the model, so as to achieve the precise noise reduction, thereby enabling the noise reduction effect of the system to be optimal. In other words, the method achieves the noise reduction ata position that the noise reduction is most required, so as to achieve the optimal noise reduction effect of the whole space, and reduce the noise level of the space.

Description

technical field [0001] The invention relates to the field of noise reduction, in particular to a space field active noise reduction method. Background technique [0002] In the working and living environment, noise pollution can be seen everywhere, and these noises have caused adverse effects on people's physical and mental health. Therefore, the noise reduction design in the space field is a relatively important task. It is relatively complicated. The traditional active noise reduction method in the space field measures the noise signal at each noise sampling point, and uses a filter circuit to generate a noise reduction signal based on each noise signal to achieve the purpose of eliminating noise. The average value of the acoustic signal power at the sampling point is the evaluation standard. If the average value of the acoustic signal power at each sampling point reaches the noise reduction standard, it is considered that the overall noise level of the space field is redu...

AI Technical Summary

Problems solved by technology

[0002] In the working and living environment, noise pollution can be seen everywhere, and these noises have caused adverse effects on people's physical and mental health. Therefore, the noise reduction design in the space field is a relatively important task. It is relatively complicated. The traditional active noise reduction method in the space field measures the noise signal at each noise sampling point, and uses a filter circuit to generate a noise reduction signal based on each noise signal to achieve the purpose of eliminating noise. The average value of the acoustic signal power at the sampling point is the evaluation standard. If the average value of the acous

Images