Adaptive Noise Cancellation system study and development

• Main Authors: Sheng-Han Li, 李昇翰
• Other Authors: Yao-Tsung Huang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/81401344463345835523

碩士 === 高苑科技大學 === 電子工程研究所 === 96 === This paper presents a vocal pick-up system with noise reduction function for applications on mobile communication devices or cellphone and notebook pc. Miniaturized condenser-type microphone made by MEMS technology were used for the study. The pick-up system consists two-microphones and a modified NLMS algorithm for noise reduction. The contents of study include an testing platform of simple vocal implementation, directionality modification for omni-microphone,desing of a dual-microphone system of with noise cancellation, normalized-least-mean-square algorithm, noise cancellation simulate using MATLAB, digital sound signal-processing platform implemetation on DSK6713, and real-time noise cancellation testing. The final result of study propose a dual-microphone pick-up structure, with a signal pre-processor of NLMS noise cancellation algorithm. The results of noise reduction testing reveal this pick-up system is success in noise reduction and performs well in high-level noise environment, and robust to various types of noise.