Study On Active Noise Control Based On DSP

With modem industrial development, the subject of noise control has attracted people's attention and concern. Active Noise Control(ANC) is a relative new technique in the field of noise control and has been developed rapidly in recent years. With the development of electronic technique, adaptive filter technique has been used in ANC and formed Adaptive Active Noise Control (AANC). AANC is very effective on reducing low frequency, and AANC has the less bulk, lighter weight than the passive reduction noise measures.this thesis is to study the algorithm of active noise control and realize technology. This dissertation which was according as the theory of active noise control analyzed the configurations and the theories of feedforward control system first. The single and multichalmel FXLMS algorithm are deduced and concluded respeetively, so were the calculation steps of inductive algorithm. Paper also makes statistics on the calculation amount of multichannel FXLMS algorithm and discusses the influence of system parameters. The criterion of computational load of ANCC algorithm is summaried with the features of DSP controller in ANCC systens,and the specific computational loads of FXLMS algorithm are counted.Based on theoretic analysis and computer simulations,the performance of single-path and multi-channel AANC systems is studied.Last,a two-channel adaptive active noise controller is designed by using TMS320C5509A DSP,and an AANC Was built for experimental research. Controller including hardware and software design Was applied to build the AANC. Experiment shows that the controller can achieve the design requirements, and the system reprensents a good noise reduction performance.