An active noise reduction device based on adaptive mfxlms algorithm and its FPGA implementation

Abstract

The present invention claims to protect an active noise reduction device based on the self-adaptive MFxLMS algorithm and FPGA implementation, which includes the software part of the momentum MFxLMS algorithm and the hardware part of the FPGA, wherein the software part of the momentum MFxLMS algorithm includes a noise signal filtering module, a MFxLMS algorithm module, a second Level channel modeling module, white noise generator and main channel path module; FPGA hardware part includes WM8731 audio codec, IIC control module, register configuration module, clock generation module, 2 audio receiving modules, audio sending module, 2 FIFO module and ANC algorithm module, the active noise control algorithm of the present invention can not only reduce computational complexity, modeling accuracy, steady-state performance and convergence speed, but also use the parallel processing capability of FPGA to make the algorithm run faster.

Description

technical field [0001] The invention belongs to the field of audio signal processing, and in particular relates to a research on a secondary channel modeling method in an active noise control system (ANC) for low-frequency noise elimination based on a momentum MFxLMS algorithm and the construction of a hardware platform. Background technique [0002] With the development of economy and the continuous advancement of urbanization, urban noise has become an urgent problem to be solved. In 2018, the statistics of the national "12369 Environmental Protection Report Network Management Platform" showed that reports involving noise accounted for 35.3%, ranking second only to air pollution. Among the urban noises, the traffic noise on both sides of the main traffic line is the most obvious. The Ministry of Ecology and Environment pointed out in the "China Environmental Noise Pollution Prevention and Control Report" in 2019 that in 2018, the detection data on both sides of the main t...

AI Technical Summary

Problems solved by technology

In the passive noise reduction scheme, the noise reduction effect of resistive noise reduction equipment in the middle and high frequency bands is ideal, but the noise reduction effect for low frequency bands is poor; The equipment can have a strong noise reduction effect on specific low-frequency noise, but because the noise reduction frequency is narrow and the volume is relatively large, it can only be used for special large-scale occasions, but it is not suitable for indoor noise reduction in general urban residential buildings.

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