本文選題：Volterra濾波器 + 非線性主動噪聲控制��； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：在非線性信號處理領(lǐng)域中一個(gè)重要的研究對象是非線性主動噪聲控制,由Volterra濾波器本身包含的非線性特性,適合創(chuàng)建非線性系統(tǒng)模型,能夠有效的實(shí)現(xiàn)非線性主動噪聲控制。因此,基于Volterra濾波器的非線性主動噪聲控制就成為自適應(yīng)信號處理領(lǐng)域中備受關(guān)注的熱點(diǎn)。論文在選題的背景和意義及基于Volterra濾波器的非線性主動噪聲控制國內(nèi)外研究現(xiàn)狀的基礎(chǔ)上,對濾波器結(jié)構(gòu)進(jìn)行深入研究,來實(shí)現(xiàn)低計(jì)算復(fù)雜度的非線性主動噪聲控制效果。利用Volterra濾波器和DCT技術(shù)兩個(gè)方面,探究一些新型結(jié)構(gòu)的非線性主動噪聲控制器。主要是在標(biāo)準(zhǔn)的二階Volterra濾波器和三階Volterra濾波器結(jié)構(gòu)、擴(kuò)展流水線Volterra濾波器結(jié)構(gòu)基礎(chǔ)之上,適當(dāng)?shù)膽?yīng)用DCT技術(shù)來改進(jìn)繼而提出相應(yīng)的新型結(jié)構(gòu)的非線性主動噪聲控制器。本文又對所提出的DCT域二階Volterra濾波器結(jié)構(gòu)的主動噪聲控制中應(yīng)用的FXLMS算法進(jìn)行改變,采用NLMS算法和變步長算法,目的是為進(jìn)一步改善系統(tǒng)的性能,計(jì)算機(jī)仿真證明了其可行性、有效性及優(yōu)越性。論文的主要研究成果包括：1研究了兩種DCT域Volterra濾波器的非線性主動噪聲控制結(jié)構(gòu),即基于DCT域二階和三階Volterra濾波器的非線性主動噪聲控制結(jié)構(gòu),此主動噪聲控制器最大特點(diǎn)是結(jié)構(gòu)簡單,實(shí)現(xiàn)容易,能夠減少嚴(yán)重的計(jì)算量負(fù)擔(dān)和提高濾波器算法的收斂速度。2在提出的基于DCT域二階Volterra濾波器的非線性主動噪聲控制結(jié)構(gòu)基礎(chǔ)之上,對其應(yīng)用的FXLMS算法和算法中固定步長的不足進(jìn)行改進(jìn),采用NLMS算法和變步長算法來改變系統(tǒng)權(quán)系數(shù)的更新方式。計(jì)算機(jī)仿真結(jié)果表明,NLMS算法和變步長算法不僅在新的結(jié)構(gòu)中有效可行,而且保證系統(tǒng)低計(jì)算復(fù)雜度的情況下,提高了收斂速度和保證了較低的穩(wěn)態(tài)誤差。3基于擴(kuò)展流水線Volterra濾波器結(jié)構(gòu)的基礎(chǔ)之上應(yīng)用DCT技術(shù),提出基于DCT域擴(kuò)展流水線Volterra濾波器非線性主動噪聲控制結(jié)構(gòu)及改進(jìn)結(jié)構(gòu)。實(shí)現(xiàn)了系統(tǒng)性能的改善,更重要的是進(jìn)一步達(dá)到了非線性主動噪聲控制的低計(jì)算復(fù)雜度需求。
[Abstract]:Nonlinear active noise control is an important research object in the field of nonlinear signal processing. The nonlinear characteristics contained in Volterra filter are suitable for the establishment of nonlinear system model and can effectively realize nonlinear active noise control. Therefore, nonlinear active noise control based on Volterra filter has become a hot topic in the field of adaptive signal processing. Based on the background and significance of the topic and the research status of nonlinear active noise control based on Volterra filter at home and abroad, the structure of the filter is deeply studied to achieve the low computational complexity of nonlinear active noise control effect. Using Volterra filter and DCT technology, some new nonlinear active noise controllers are studied. Based on the standard second-order Volterra filter and third-order Volterra filter structure and extended pipelined Volterra filter structure, a new nonlinear active noise controller is proposed by using DCT technology. In this paper, the FXLMS algorithm used in the active noise control of the second-order Volterra filter structure in DCT domain is changed, and the NLMS algorithm and the variable step size algorithm are adopted in order to further improve the performance of the system. The computer simulation proves its feasibility. Effectiveness and superiority. The main research results of this paper include: 1, the nonlinear active noise control structure of two kinds of Volterra filters in DCT domain is studied, that is, the nonlinear active noise control structure based on DCT second-order and third-order Volterra filters. This active noise controller is characterized by its simple structure and easy implementation. It can reduce the heavy computational burden and improve the convergence speed of the filter algorithm .2 based on the proposed nonlinear active noise control structure based on the second-order Volterra filter in DCT domain. In order to improve the FXLMS algorithm and the deficiency of the fixed step size, the NLMS algorithm and the variable step size algorithm are used to change the updating method of the system weight coefficient. The computer simulation results show that the NLMS algorithm and the variable step size algorithm are not only effective and feasible in the new structure, but also ensure the low computational complexity of the system. The convergence rate is improved and the steady-state error is guaranteed. 3 based on the extended pipelined Volterra filter structure, the nonlinear active noise control structure and the improved structure of the extended pipeline Volterra filter based on DCT domain are proposed by using DCT technology. The performance of the system is improved and, more importantly, the low computational complexity of nonlinear active noise control is achieved.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB535;TN713

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本文編號：1923559