Realization On Low Frequency Pipe Active Noise Control System Based On DSP

With the development of modern industry, noise pollution has become one ofthe world’s three, affecting people’s production and life. Adopting effective mannernoising become a hot issue of concern.Active noise control technology is morerapid development in recent years of research. Active noise control technology ismainly used to eliminate low frequency noise, especially in regard to eliminatelow-frequency narrowband noise strong competitive advantage. In practicalapplications, the narrowband low-active noise control is mainly used in rotatingmachinery such as periodic motion of large-scale equipment, and these devices aremostly noise generated by piping. Therefore, for the pipeline to eliminate lowfrequency noise is significance.The main contents are as follows:(1) Described the theoretical basis for active noise control and active noisecontrol system structure, introduced the adaptive filter structure and the advantagesand disadvantages of various types of control algorithms ANC.(2) Designed the ANC controller, including the ANC control algorithmarithmetic unit, analog input and output units and peripheral equipment selectionand connection.(3) Designed a one-dimensional long straight duct ANC system noisepropagation environment. The pipeline can be simplified acoustic propagationenvironment favorable noise cancellation ANC system testing.(4) Dased on the traditional FXLMS algorithm software program, designed toincorporate variable step size FXLMS algorithm procedures, and analyzes thevariable step size algorithm in ANC actual system advantages and disadvantages.(5) Carried out several groups of different frequency noise cancellation ANCsystem experiments and variable step size algorithm for de-noising experiments,analysis of experimental results and the problems encountered in the experimentgives the corresponding solutions.