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A nonparametric variable step-size subband adaptive filtering algorithm for acoustic echo cancellation

International Journal of Agricultural and Biological Engineering 2020年第3期13卷 168-173页

作者： Yue Song Yanzhao Ren Xinliang Liu Wanlin Gao Sha Tao Lin Guo Key Laboratory of Agricultural Informatization Standardization Ministry of Agriculture and Rural AffairsBeijing 100083China College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China Academy of Agricultural Planning and Engineering Ministry of Agriculture and Rural AffairsBeijing 100125China Key Laboratory of Cultivated Land Use Ministry of Agriculture and Rural AffairsBeijing 100125China

Acoustic echo cancellation is often applied in communication and video call system to reduce unnecessary echoes generated between speakers and *** these systems,the speech input signal of the adaptive filter is often colored and unstable,which decays the convergence rate of the adaptive filter if the NLMS algorithm is *** this paper,an improved nonparametric variable step-size subband(NPVSS-NSAF)algorithm is proposed to address the *** variable step-size is derived by minimizing the sum of the square Euclidean norm of the difference between the optimal weight vectors to be updated and the past estimated weight *** the parameters are eliminated by using the power of subband signal noise equal to the power of subband posteriori *** performance of the proposed algorithm is simulated in the aspects of misalignment and return loss *** results show a fast convergence rate and low misalignment of the proposed algorithm in system identification.

关键词： echo cancellation fast convergence low misalignment nonparametric variable step size

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Combined-step-size Proportionate Decorrelation NLMS Algorithm for Adaptive echo cancellation

Combined-step-size Proportionate Decorrelation NLMS Algorith...

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第三十九届中国控制会议

作者： Yishu Peng Sheng Zhang Jiashu Zhang Fuyi Huang The School of Information Science and Technology Southwest Jiaotong University

Due to the highly correlated speech input signal and sparse echo path in echo cancellation application, the conventional least mean square（LMS） algorithm will suffer from slow convergence rate. In this paper, we firstly develop an improved proportionate weight-constraint decorrelation normalized least mean square（IPDNLMS） algorithm, which makes use of decorrelation and proportionate methods to increase the convergence rate. Then, to solve the conflict between fast convergence rate and small steady-state error, a combined-step-size IPDNLMS（CSS-IPDNLMS） algorithm is proposed, which combines two different step-sizes of one IPDNLMS filter adaptively via a modified sigmoidal activation function. The stability analysis is also carried out. Finally, simulation results indicate the proposed CSS-IPDNLMS algorithm is efficient and outperforms the normalized least mean square（NLMS）, improved proportionate NLMS（IPNLMS）, weight-constraint decorrelation NLMS（WCDNLMS）, proportionate decorrelation NLMS（PDNLMS）, and IPDNLMS algorithms.

关键词： Adaptive filter combined-step-size decorrelation echo cancellation proportionate filter

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Design of Adaptive Filtering Algorithm and Its Application in Chaotic echo cancellation

Design of Adaptive Filtering Algorithm and Its Application i...

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第24届中国控制与决策会议

作者： Bo Yang 1 , Jian Feng 2 1. School of Electronic and Information Engineering, Southwest University, Chongqing 400715, China2. Department of Cardiology, First Affiliated Hospital, Luzhou Medical College, Luzhou 646000, China

An adaptive filtering algorithm is designed in this study, and the convergence of the algorithm is analyzed. The new algorithm is used to cancel echo in the chaotic communication systems experiencing echo channels. The results of computer simulation indicate that the new algorithm has faster convergence speed and higher accuracy of computation than that of the old one. In addition, the new algorithm is more stable in the case of low signal to noise ratio （SNR） .

关键词： echo cancellation Adaptive Filtering Algorithm Chaos Signal to Noise Ratio

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本地干扰存在情况下频域自适应回声抵消算法的改进

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声学技术 2005年第Z1期24卷 97-98页

作者：吴晟邱小军近代声学国家重点实验室南京大学声学研究所南京210093 近代声学国家重点实验室南京大学声学研究所南京210093

　　1引言　　在回声抵消系统中,当本地有干扰声源时,回声抵消系统的性能将恶化[1][2].对于本地话语引起的干扰,双边讲话检测器(DTD)是解决该问题的途径之一,但若本地的干扰是持续的,该方法将不可行.Jenq和Hsieh介绍了引入持续的舒适性... 详细信息

　　1引言　　在回声抵消系统中,当本地有干扰声源时,回声抵消系统的性能将恶化[1][2].对于本地话语引起的干扰,双边讲话检测器(DTD)是解决该问题的途径之一,但若本地的干扰是持续的,该方法将不可行.Jenq和Hsieh介绍了引入持续的舒适性噪声进行回声通道建模的理论[3];***利用远端和本地信号的相关性建立了相关最小均方(CLMS)算法和扩展相关最小均方算法(ECLMS)[4].但是,前者在小建模噪声下收敛慢,需要先在无干扰情况下收敛到稳定状态才能良好工作,后者被证实和NLMS算法等价,在小更新步长下完成收敛,因此收敛速度太低而没有实用价值.对于本地持续噪声引起的干扰,本文提出了选用优化的更新步长和交迭系数来使得频率算法能够在有本地干扰的情况下对回声的抵消有良好效果.　　……

关键词：干扰声源频域自适应回声抵消算法 echo cancellation 回声抵消系统最小均方算法收敛速度持续噪声稳定状态频率算法建模步长本地信号相关性无干扰舒适性检测器优化性能

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Performance Evalution of 2B1Q Data echo Canceller in Digital Subscriber Access Networks

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The Journal of China Universities of Posts and Telecommunications 1997年第2期4卷 68-71页

作者： Tang Baomin (Nanjing University of Posts and Telecommunications, Nanjing 210003, P.R.China)

Recently, a lot of digital subscriber loop systems (DSL) and high rate digital subscriber loop systems (HDSL) have been deployed in digital subscriber access networks. Data echo canceller is extensively used in the DSL and HDSL systems to realize full duplex transmission on twisted cable. In such systems, 2B1Q line code is adopted. Therefore, symbol rate is decreased and digital transmission systems get longer reach. In this paper, a performance evaluation method of the echo canceller is proposed based on an autocorrelation matrix of 2B1Q line code. Using this method, the formula of ratio of data signal to echo residual signal is obtained. According to the formula, the ratio of data signal to echo noise depends on FIR filter tap, convergence factor, adaptive algorithm and the correlation matrix of the line code. Computer simulation is carried out to verify theoretical analysis. The simulation results coincided with the theoretical formula in the process estimating the ratio of signal to noise.

关键词： digital communication access network echo cancellation

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Fast echo Canceller in IP Telephony Gateway

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Journal of Beijing Institute of Technology 2003年第1期12卷 109-112页

作者：黄永峰李星 Department of Electronic Engineering Tsinghua UniversityBeijing100084China

The length of the echo path in the IP telephony system is very long. Generally, the echo canceller is implemented on the IP telephony gateway which needs to perform concurrently multi-channel echo cancellation and voice compression. Hence, the most key technique to design the echo canceller is to reduce greatly the computational requirement. For this reason a number of innovative features to implement a fast echo canceller are presented. The key components of this canceller include: the separation of adaptive and cancel filters, non-real-time adaptation and real-time cancellation, sharing VAD algorithms with the speech codec, the incorporation of delay indexing with zero coefficients, and windowing the adaptive filter coefficients to reduce the cost of DSP during the cancellation. Finally, the performance of the echo canceller is summarized; the results of evaluation show that the performance gains for echo cancellation are significant.

关键词： echo cancellation voice activity detection adaptive filter

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A VSS-NLMS Algorithm Designed for DTMB On-Channel Repeater

A VSS-NLMS Algorithm Designed for DTMB On-Channel Repeater

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2011 International Conference on Computer Science and Information Technology(ICCSIT 2011)

作者： Zhengping Liu Wei Xia Zishu He Chang Liu Jianlin Zhou School of Electronic Engineering University of Electronic Science and Technology of China

ISBN: (纸本)9781612848334

In this paper, we use adaptive filter to realize the echo cancellation strategy in On-Channel Repeater (OCR) based on the National Standard of China for Digital Terrestrial Multimedia Broadcasting (DTMB). In order to solve the conflicting requirement of fast convergence and low misadjustment of the Normalized Least Mean Square (NLMS) algorithm, this paper proposes a Variable Step-Size Normalized Least Mean Square (VSS-NLMS) algorithm. This algorithm does not require any a priori information, so it is easy to control in real world. Simultaneously, the simulation results indicate that this algorithm has a better performance in convergence rate and misadjustment in steady state echo cancellation compared with the conventional LMS algorithm and conventional RLS algorithm.

关键词： Lms On-Channel Repeater (Ocr) Dtmb echo cancellation Adaptive Filter

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