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Research on key technologies to achieve adaptive active headsets works

Author: DongShuBin
Tutor: ChenKeAn
School: Northwestern Polytechnical University
Course: Underwater Acoustics
Keywords: Earmuffs Adaptive Secondary path modeling FLMS algorithm
CLC: TB535
Type: Master's thesis
Year: 2005
Downloads: 154
Quote: 6
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Abstract


With the development of electronic technology and control theory , active noise control has become a hot research field of noise control . Active noise reduction earmuffs include both analog and digital , which is the active noise control technology a more examples of successful applications in engineering . Adaptive active headsets, on the basis of the traditional earmuffs installation of adaptive active noise control device digital active headsets , which uses the active method to reduce ordinary earmuffs difficult low-frequency noise attenuation , resulting in on a very wide frequency band to get a better noise reduction effect . In this thesis, the key technologies of the adaptive active noise reduction earmuffs Engineering , including the the secondary pathway modeling and adaptive active noise reduction hardware realization of the establishment of the adaptive active headsets experimental system . First , the paper briefly reviews the history and current status of the development of active headsets , detailed analysis of the composition of algorithm and implementation of adaptive active control system . An easy practical application of the adaptive active control algorithm - FLMS algorithm , the main parameters of the algorithm on the performance of the algorithm , a simulation study . A detailed analysis of all aspects of the characteristics of the secondary path modeling method as well as the secondary path transfer function derived sub- channel sound space and a secondary pathway offline and online modeling both cases , carried out a detailed computer simulation . Secondly, the establishment of the the adaptive active headsets experimental system , including analog head, ear muffs , controller . Writing and debugging adaptive active noise reduction algorithm , off-line modeling algorithm . The actual adaptive offline data modeling experiments . Comparison of the experimental results of a delay algorithm ( DLMS ) and the filtered - X ( FLMS ) algorithm . The results show that : through the secondary path modeling , FLMS algorithm significantly improved noise reduction . In the experiment has initially solved the problem of adaptive active noise reduction process of the stability of the system .

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and noise control and its use
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