The Research Of Algorithm Of Active Noise Control And Its Application

With modern industrial development, noise control issue has drawn increasing attention and concern. When long-term exposure to noise environment, people's hearing and health will be serious harm,and the general noise has different degrees of impact on people's normal life and work. The Active Noise Control of the three-dimensional space is of vital significance.This thesis is to study the algorithm of active noise control and realize technology. From testing cabin noise, not only the medium and high frequency component, but also large proportion of the low frequency component in living and working cabin which are mainly distributed in 32～500Hz. To research the active noise control technique for the obturate room (such as cabin) .In this thesis, it base on the analysis of the adaptive filter and algorithm, comparison performance of several commonly algorithm which used in the niose control.propose a program for single-channel AANC. Use FIR filter structure and normalized least mean variance filtering algorithm (NFLMS). Realize a active noise cancellation systems for adaptive control, while bring forward a method of the hardware and software design.Finally use embeded and serial communication technique to realize a forward feedback adaptive niose control system, the experiment verifies reducing noise obviously, can meet real-time processing requirement.The simulation and hardware implementation in this thesis only consider the work by the single-channel, due to SPCE061A of sunplus single chip has 16 bit*16 bit multiply and inner operation function, interrupt handling function,adapt to real time speech processing, and it is cheap that we use SPCE061A. if on the multi-channel situation, we need to consider the secondary source position , amount of computation and algorithm, now the high-speed digital signal processor chip (DSP) should be a good choice.