Research Of Adaptive Noise Cancellation Technology Based On DSP

With the development of the information processing theory and technology,filtering technology has been used widely.The traditional weights of the digital filtercoefficients are fixed,in practice the absence of sufficient information to design a fixed coefficient,so a lot of problems difficult to solve.The emergence of adaptive filtering technique to overcome this problem,the notable feature of adaptive filter is changed without user intervention will be able to respond automatically to improve performance.Since the adaptive technology to become a new branch of signal processing fields,the research of adaptive filtering algorithm for adaptive signal processing is one of the most active research topics.Today,adaptive filtering techniques are widely used,such as:adaptive channel equalization, signal enhancement, adaptive noise cancellation etc. In this article, the main object of study is the adaptive noise canceller technology .We are surrounded by noise,in the communications and information exchange,we are inevitably affected by both the external noise and the internal noise interference.Speech denoising technique is to extract and enhance the useful signal from the background noise, inhibit,reduce the noise interference.Speech denoising both in daily life or in the military field, and even voice processing technology itself has a very strong application.Adaptive noise cancellation technology as a more advanced speech denoising technique,currently receiving great attention,has become a new hotspot areas in the voice denoising fields.This paper mainly studies the following aspects:(1) After reading massive books and literatures about adaptive filtering techniques and voice noise suppression technique,we have a induction and summariation about adaptive filtering applications and commonly used algorithms.Mainly about mostly commonly used LMS algorithm and RLS adaptive algorithm performance is analyzed and discussed.(2) Construct a theory of adaptive noise canceling system,prepare the LMS algorithm MATLAB simulation to our design,analysis the viability of the LMS algorithm in speech denoising,for some shortcomings of the LMS algorithm,we research a improved algorithm– HLMS.Through the simulation of two recording to test the advantages and disadvantages of the new algorithm.(3) Using the DSP chip TMS320VC5402,build a DSP voice processing system.Through the simulation of the analog input to test the feasibility of this system,then through a recording experimental test to test the reliability of this system when we deal with the actual noise.