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基于噪音擬合的優(yōu)化變步長(zhǎng)濾波最小均方算法
2021年電子技術(shù)應(yīng)用第11期
錢 拴1,2,高健珍1,2,代永平1,,2
1.南開大學(xué) 光電子薄膜器件與技術(shù)研究所,天津300350; 2.天津市光電子薄膜器件與技術(shù)重點(diǎn)實(shí)驗(yàn)室,,天津300350
摘要: 為了更快地實(shí)現(xiàn)主動(dòng)降噪,,設(shè)計(jì)了噪音多項(xiàng)式擬合模型,提出了改進(jìn)的變步長(zhǎng)濾波最小均方算法(Improved Filtered-x Least Mean Square,,IFxLMS),。該算法在統(tǒng)計(jì)噪音信號(hào)的同時(shí),對(duì)噪音信號(hào)進(jìn)行擬合與預(yù)測(cè),,隨后結(jié)合誤差信號(hào)與預(yù)測(cè)信號(hào)對(duì)步長(zhǎng)進(jìn)行調(diào)節(jié),,達(dá)到快速調(diào)節(jié)的目的。為了驗(yàn)證該算法的性能,,將該算法與傳統(tǒng)變步長(zhǎng)濾波最小均方算法對(duì)比試驗(yàn),,仿真結(jié)果顯示,在相同噪音條件下,,新算法將噪音信號(hào)降到10 dB,、20 dB、30 dB,、35 dB等信噪比時(shí),,所需的迭代次數(shù)減少了4次~60次不等,在同時(shí)新算法的魯棒性也優(yōu)于普通的濾波變步長(zhǎng)最小均方算法,。
中圖分類號(hào): TN911.72
文獻(xiàn)標(biāo)識(shí)碼: A
DOI:10.16157/j.issn.0258-7998.201091
中文引用格式: 錢拴,,高健珍,代永平. 基于噪音擬合的優(yōu)化變步長(zhǎng)濾波最小均方算法[J].電子技術(shù)應(yīng)用,,2021,,47(11):81-84,89.
英文引用格式: Qian Shuan,,Gao Jianzhen,,Dai Yongping. Optimal variable step filtered-x least mean square algorithm based on noise fitting[J]. Application of Electronic Technique,2021,,47(11):81-84,,89.
Optimal variable step filtered-x least mean square algorithm based on noise fitting
Qian Shuan1,2,,Gao Jianzhen1,,2,Dai Yongping1,,2
1.Institute of Optoelectronic Thin Film Devices and Technology,,Nankai University,Tianjin 300350,,China,; 2.Key Laboratory for Photoelectronic Thin Film Devices and Technology of Tianjing,Tianjin 300350,,China
Abstract: In order to achieve active noise reduction faster, a noise polynomial fitting model is designed, and an improved variable step size filtering least mean square algorithm(improved filtered-x least mean square, IFxLMS) is proposed. The algorithm performs fitting and prediction to the noise signal while counting the noise signal, and then adjusts the step length by combining the error signal and the predicted signal to achieve the purpose of rapid adjustment. In order to verify the performance of the algorithm, the algorithm is compared with the traditional variable step filter-x least mean square algorithm. The simulation results show that under the same noise conditions, when the new algorithm reduces the noise signal to 10 dB, 20 dB, 30 dB, 35 dB, etc. The number of iterations required has been reduced from 4 to 60. At the same time, the robustness of the new algorithm is better than that of the ordinary variable step size filtered-x least mean square algorithm.
Key words : filtered-x least mean square algorithm,;noise fitting,;variable step size;active noise reduction

0 引言

    隨著城市化進(jìn)程,,環(huán)境的噪音問題日益突出[1],,降噪的設(shè)備及相關(guān)算法逐漸成為了研究的熱點(diǎn)問題[2],濾波最小均方算法(Filtered-x Least Mean Square,,F(xiàn)xLMS)由于其計(jì)算量相對(duì)較小被大量應(yīng)用于主動(dòng)降噪設(shè)備[3],。最小均方算法的降噪步長(zhǎng)決定了系統(tǒng)的降噪速度以及降噪精度,步長(zhǎng)的迭代公式也決定了算法的運(yùn)算量,,進(jìn)而影響設(shè)備降噪的速度[4],。FxLMS可用于主動(dòng)降噪設(shè)備以降低設(shè)備局部噪音,包含的降噪場(chǎng)景有電梯[5],、高鐵、汽車[6],、耳機(jī)[7]以及潛艇等方面,,在社會(huì)應(yīng)用中有極大應(yīng)用價(jià)值。

    算法迭代步長(zhǎng)是FxLMS研究重要方向之一[8],,較大的迭代步長(zhǎng)可以使得FxLMS算法收斂速度較快,,但是系統(tǒng)的穩(wěn)態(tài)性不高;較小的迭代步長(zhǎng)可以提供較穩(wěn)態(tài)的結(jié)果,,但是系統(tǒng)的迭代次數(shù)過多,,收斂速度較慢。針對(duì)以上問題,,文獻(xiàn)[9]提出歸一化泄露FxLMS算法,,收斂步長(zhǎng)受到誤差信號(hào)的影響,同時(shí)也避免了因誤差信號(hào)過小而導(dǎo)致的步長(zhǎng)過大問題,;馬英博[5]改善變步長(zhǎng)因子更新的方式是計(jì)算出誤差信號(hào)與輸入信號(hào)之間的相關(guān)性,,再根據(jù)相關(guān)性更改步長(zhǎng)的迭代;文獻(xiàn)[10]使得步長(zhǎng)以指數(shù)函數(shù)變化,;文獻(xiàn)[11]更改了步長(zhǎng)因子的計(jì)算公式,,使得算法在收斂初期步長(zhǎng)小以實(shí)現(xiàn)算法的收斂,中期步長(zhǎng)變大快速收斂,,后期降低收斂因子提高收斂精度,。




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作者信息:

錢  拴1,,2,,高健珍1,2,,代永平1,,2

(1.南開大學(xué) 光電子薄膜器件與技術(shù)研究所,,天津300350;

2.天津市光電子薄膜器件與技術(shù)重點(diǎn)實(shí)驗(yàn)室,,天津300350)




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