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检索条件"主题词=FxLMS algorithm"

共 98 条记录，以下是71-80 订阅

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On Adaptive Feedback Active Noise Control Systems With Online Adaptation of Secondary Path Estimation Filter 67

On Adaptive Feedback Active Noise Control Systems With Onlin...

引用

67th IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Akhtar, Muhammad Tahir Nazarbayev Univ Sch Engn & Digital Sci Dept Elect & Comp Engn Kabanbay Batyr Ave 53 Astana Kazakhstan

ISBN: (纸本)9798350387186;9798350387179

This paper focuses on identifying the secondary path (SP) in feedback active noise control (FBANC) systems during online operation. In FBANC, it's not feasible to install a reference microphone for capturing the reference signal needed for the (adaptive) active noise control (ANC) filter. Consequently, an appropriate reference signal is required to be electronically generated, necessitating an accurate estimation of the SP. The accuracy of SP estimation (SPE) directly impacts the stability and noise reduction capabilities of ANC systems. Building upon prior work that utilized two adaptive filters;one for ANC and another for SPE;this paper presents a method with a similar structure. The key idea in this paper is to tailor a generalized sigmoid function for developing a variable step-size (VSS)-based adaptive algorithm for (adaptive) ANC filter. The proposed method exhibits improved noise reduction performance as well as good SPE performance, as evidenced by the detailed numerical results provided in the paper.

关键词： Feedback ANC systems fxlms algorithm secondary path estimation generalized sigmoid function variable step-size algorithm

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ROBUST ADAPTIVE algorithm FOR ACTIVE NOISE CONTROL OF IMPULSIVE NOISE

ROBUST ADAPTIVE ALGORITHM FOR ACTIVE NOISE CONTROL OF IMPULS...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Akhtar, Muhammad Tahir Mitsuhashi, Wataru Univ Electrocommun Educ & Res Ctr Frontier Sci & Engn 1-5-1 Chofugaoka Tokyo 1828585 Japan Univ Electrocommun Dept Informat & Commun Engn Tokyo 1828585 Japan

ISBN: (纸本)9781424423538

The paper concerns active control of impulsive noise. The most famous filtered-x least mean square (fxlms) algorithm for active noise control (ANC) systems is based on the minimization of variance of error signal. The impulsive noise can be modeled using non-Gaussian stable process for which second order moments do not exist. The fxlms algorithm, therefore, becomes unstable for the impulsive noise. Among the existing algorithms for ANC of impulsive noise, one is based on the minimizing least mean p-power (LMP) of the error signal, resulting in FxLMP algorithm. The other is based on modifying;on the basis of statistical properties;the reference signal in the update equation of the fxlms algorithm. In this paper, the proposed algorithm is a modification and combination of these two approaches. Extensive simulations are carried out, which demonstrate the effectiveness of the proposed algorithm. It achieves the best performance among the existing algorithms, and at the same computational complexity as that of FxLMP algorithm.

关键词： Active noise control fxlms algorithm impulse noise stable processes FxLMP algorithm

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THEORETICAL DISCUSSION OF THE FILTERED-X LMS algorithm BASED ON STATISTICAL MECHANICAL ANALYSIS

THEORETICAL DISCUSSION OF THE FILTERED-X LMS ALGORITHM BASED...

引用

IEEE Statistical Signal Processing Workshop (SSP)

作者： Miyoshi, Seiji Kajikawa, Yoshinobu Kansai Univ Fac Engn Sci Suita Osaka 5648680 Japan

ISBN: (纸本)9781467301831

We theoretically obtain the learning curves of the fxlms algorithm on the basis of statistical mechanical analysis. Cosines of angles between the coefficient vectors of an adaptive filter, its shifted filters, and an unknown system are treated as macroscopic variables. Assuming that the tapped-delay line is sufficiently long and exactly calculating the correlations between the past tap input vectors and the coefficient vector of the adaptive filter, we obtain simultaneous differential equations that describe the dynamical behaviors of the macroscopic variables in a deterministic form. We analytically solve the equations and show that the obtained theory quantitatively agrees with computer simulations. In the analysis, neither the independence assumption, the small step-size condition, nor the few-taps assumption is used.

关键词： fxlms algorithm adaptive filter active noise control statistical mechanical informatics thermodynamic limit

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STABILITY OF RESIDUAL ACOUSTIC NOISE VARIANCE IN ACTIVE CONTROL OF STOCHASTIC NOISE

STABILITY OF RESIDUAL ACOUSTIC NOISE VARIANCE IN ACTIVE CONT...

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IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Ardekani, Iman Tabatabaei Abdulla, Waleed Univ Auckland Auckland 1 New Zealand

ISBN: (纸本)9781479903566

This paper concerns about the theoretical stability of the adaptation process performed by the Filtered-x Least Mean Square (fxlms) algorithm in active control of acoustic noise. A dynamic model for the Variance of Residual Acoustic Noise (VRAN) is developed and it is shown that the stability of this model is a sufficient condition for the stability of the adaptation process. The basic rules governing the VRAN root locus are developed, based on which an upper-bound for the adaptation step-size is derived. This upper-bound can apply to a general case with an arbitrary secondary path, unlike the traditional upper-bound used in adaptive filter theory, which was derived only for pure delay secondary paths.

关键词： Active noise control fxlms algorithm

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FREQUENCY MISMATCH IN NARROWBAND ACTIVE NOISE CONTROL

FREQUENCY MISMATCH IN NARROWBAND ACTIVE NOISE CONTROL

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2010 IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Jeon, Hyeon-Jin Kim, Shin-Wook Park, Min-Woo Lee, Woo-Geun Chang, Tae-Gyu Kuo, Sen M. Chung Ang Univ Dept Elect & Elect Engn Seoul South Korea Northern Illinois Univ Dept Elect Engn De Kalb IL 60115 USA

ISBN: (纸本)9781424442966

This paper analyzes the effects of frequency error in internal signal generator for narrowband active noise control systems. Two stability conditions and the optimum step-size to achieve the minimum excess mean-square error are analyzed in the paper. The noise reduction is formulated as a function of frequency mismatch, step size, and phase error in the estimation of the secondary path. The theoretical analysis presented in the paper is verified by computer simulations.

关键词： fxlms algorithm frequency mismatch stability and steady-state analysis narrowband active noise control

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Improved Adaptive algorithm for Active Noise Control of Impulsive Noise

Improved Adaptive Algorithm for Active Noise Control of Impu...

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9th International Conference on Signal Processing

作者： Akhtar, Muhammad Tahir Mitsuhashi, Wataru Univ Electrocommun Educ & Res Ctr Frontier Sci 1-5-1 Chofugaoka Tokyo 1828585 Japan Univ Electrocommun Dept Informat & Commun Engn Tokyo 1828585 Japan

ISBN: (纸本)9781424421787

The paper concerns active control of impulsive noise. The most famous filtered-x least mean square (fxlms) algorithm for active noise control (ANC) systems is based on the minimization of variance of mean-squared-error signal. The impulsive noise can be modeled using non-Gaussian stable process for which second order moments do not exist. The fxlms algorithm, therefore, becomes unstable for the impulsive noise. Among the existing algorithms for ANC of impulsive noise, one is based on the minimizing least mean p-power (IMP) of the error signal, resulting in FxLMP algorithm. The other is based on modifying;on the basis of statistics properties;the reference Signal in the update equation of the fxlms algorithm. In this paper, the proposed algorithm is an extension of the later approach. Extensive simulations are carried out, which demonstrate the effectiveness of the proposed algorithm. It achieves the best performance among the existing algorithms, and at the same computational complexity as that of fxlms algorithm.

关键词： Active noise control fxlms algorithm impulse noise stable processes

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Energy efficient inverse power control for a cognitive radio link

Energy efficient inverse power control for a cognitive radio...

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2nd International Conference on Cognitive Radio Oriented Wireless Networks and Communications

作者： Hoyhtya, Marko Sahai, Anant Cabric, Danijela Mammela, Aarne VTT Tech Res Ctr Finland POB 1100 FI-90571 Oulu Finland Univ Calif Berkeley Wireless Res Ctr Berkeley CA 94704 USA

ISBN: (纸本)9781424408146

In this paper, a novel adaptive energy and spectrum efficient inverse power control method that is based on the truncated filtered-x LMS (fxlms) algorithm is introduced. By truncated power control we mean power control where transmission is interrupted if the channel state deteriorates to bad enough. Inverse power control minimizes the interference that a cognitive radio (CR) creates to licensed users and allows more users to share the spectrum. To further reduce the transmission power and consequently the interference, truncation in power control is used. The performance of the system is improved and the amount of needed transmitted energy is smaller. Based on numerical analysis this new method offers energy efficient transmission, helps to minimize interference to the primary users, and allows even more users to share the same spectrum.

关键词： fxlms algorithm truncated power control interference control

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A Fully Adaptive Feedback ANC System Employing Online Estimation of the Cancellation Path 62

A Fully Adaptive Feedback ANC System Employing Online Estima...

引用

62nd IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Akhtar, Muhammad Tahir Nazarbayev Univ Sch Engn Dept Elect & Comp Engn Kabanbay Batyr Ave 53 Nur Sultan City Kazakhstan

ISBN: (纸本)9781728127880

The filtered-x least mean square (fxlms) algorithm for active noise control (ANC) systems requires filtering of the reference signal via the cancellation path modeling (CPM) filter. The CPM filter may be available from the offline experiments. However, in many practical situations the online estimation of CPM filter may be needed due to the possible time-varying nature of the cancellation path. This paper investigates estimation of cancellation path during the online operation of the fxlms-based feedback-type ANC system. The key idea in the proposed approach is to employ a gain-controlled probe noise mixed with the cancelation signal. The gain-factor for the probe noise is adjusted such that a large-level probe signal is used during the transient state of the ANC system. This improves the convergence of the cancellation path estimation process. As the ANC system converges, the level of the probe noise is reduced to achieve a good noise reduction performance. Simulation results demonstrate the effectiveness of the proposed method.

关键词： Feedback ANC fxlms algorithm cancellation path probe noise

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A NOVEL SELECTIVE ACTIVE NOISE CONTROL algorithm TO OVERCOME PRACTICAL IMPLEMENTATION ISSUE

A NOVEL SELECTIVE ACTIVE NOISE CONTROL ALGORITHM TO OVERCOME...

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IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Shi, DongYuan Lam, Bhan Gan, Woon-Seng Nanyang Technol Univ Sch Elect & Elect Engn Digital Signal Proc Lab Singapore Singapore

ISBN: (纸本)9781538646588

Selective active noise control (SANC) is a method to select a pre-trained control filter for different primary noises, instead of using conventional real-time computation of the control filter coefficients. SANC has the advantage of improving the robustness of control filter while reducing the computational complexity. This paper presents a practical strategy in choosing a suitable control filter based on the frequency-band-match mechanism implemented in a partitioned frequency domain filter structure. Both simulation and real-time experiment are carried out validate the noise reduction performance of the SANC compared to the conventional fxlms algorithm.

关键词： Active Noise Control Real-Time Implementation Digital Signal Processing fxlms algorithm

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An anti-interference variable-step adaptive algorithm and its application in active vibration control

An anti-interference variable-step adaptive algorithm and it...

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IEEE/OES China Ocean Acoustics (COA)

作者： Wang Chunyu He Lin Li Yan Zhang Xiaoping Zuo Lei Naval Univ Engn Inst Noise & Vibrat Natl Key Lab Ship Vibrat & Noise Wuhan Peoples R China Naval Univ Engn Ocean Elect Environm Inst Wuhan Peoples R China

ISBN: (纸本)9781467399784

Noise is unavoidable in a vibration control system due to the complexity of the actual application environment and the measuring limitation of sensing devices. In this paper, the jamming effects on the convergence process is analyzed and then we propose a new variable-step adaptive fxlms algorithm which can reduce the negative effects of interference. The new algorithm can not only solve the problem in active vibration control (AVC) properly, but also decrease the misadjustment without slowing down the convergence rate. Simulation and experimental results show that the improved algorithm can effectively reduce the noise interference, and improve the application level of fxlms algorithms in the case of vibration control.

关键词： anti-interference variable-step fxlms algorithm active vibration control actual application

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