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Nonlinear active noise control method based on fractional order gradient

An active noise control, step gradient technology, applied in active noise control, sounding equipment, instruments, etc., can solve the problem of high average noise residual, limit the application range of FsLMS algorithm, etc., to achieve low average noise residual, good noise control effect Effect

Inactive Publication Date: 2020-11-13
SICHUAN UNIV
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Problems solved by technology

However, the average noise residual of the FsLMS algorithm is high, so it is not suitable for occasions that require high noise control effects. This shortcoming limits the application range of the FsLMS algorithm

Method used

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  • Nonlinear active noise control method based on fractional order gradient
  • Nonlinear active noise control method based on fractional order gradient
  • Nonlinear active noise control method based on fractional order gradient

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Embodiment

[0045] like figure 1 As shown, the nonlinear active noise control method based on fractional gradients in this embodiment includes the following steps:

[0046] 1. Obtain the current noise input vector of the filter according to the current moment of the noise source and the primary noise value of the previous moment;

[0047] The specific implementation of this step is as follows:

[0048] Pick up the primary noise value u(n) generated by the noise source at the current moment n through the main microphone;

[0049] A total of L primary noise values ​​u(n), u(n-1),...,u(n-L+1) at the current moment n and the previous L-1 moments are connected to the network through functions to form The noise input vector x(n) of the filter at the current moment n:

[0050] x(n)={u′(n),sin[πu′(n)],cos[πu′(n)],sin[2πu′(n)],cos[2πu′(n)],…, sin[Pπu′(n)],cos[Pπu′(n)]} T

[0051] Where u'(n)=[u(n),u(n-1),...,u(n-L+1)] is the original noise signal, L=10 is the order of the original noise sign...

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Abstract

The invention relates to the field of nonlinear adaptive active noise control of acoustics, and discloses a nonlinear active noise control method based on fractional order gradient, which reduces average noise residue and improves noise control effect. The control method comprises the following steps: A, acquiring a current noise input vector of a filter according to primary noise values of a noise source at the current moment and the previous moment, B, by a filter, generating a weight vector of the current moment according to the weight coefficients of the current moment and the previous moment, C, by the filter, filtering the current noise input vector according to the weight vector at the current moment to obtain the output value of the current loudspeaker, D, updating the weight coefficient based on the fractional order gradient to obtain the weight coefficient of the filter at the next moment, and E, repeating the steps A-D until the filtering is finished. The method has the advantages of low average noise residue and small residual error, and is especially suitable for occasions with high noise control requirements.

Description

technical field [0001] The invention relates to the field of nonlinear adaptive active noise control of acoustics, in particular to a nonlinear active noise control method based on fractional gradients. Background technique [0002] The development and progress of modern civilization not only brings convenience to people's lives, but also brings a series of problems, such as noise. Industrial components such as engines, gearboxes and other equipment will generate noise due to the operation of devices, and radio frequency noise will also be generated in electronic circuits. These noises can not only interfere with the life of the device, but also greatly reduce people's sense of use, and even threaten people's health, causing tinnitus, irritability and other health problems. [0003] At present, noise control methods are mainly divided into two categories: the first is passive noise control, which refers to isolation with sound-insulating or sound-absorbing materials, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178
CPCG10K11/178G10K11/17854G10K11/17817G10K2210/3028
Inventor 尹凯丽蒲亦非张妮王竹贺巧琳
Owner SICHUAN UNIV