Wyniki wyszukiwania dla: active noise cancelling

• Optimization of active circuits for substrate noise suppression

  Publikacja

  • G. Blakiewicz
  • M. Chrzanowska-Jeske

  - Rok 2008

  Zakłócenia generowane przez szybkie podukłady cyfrowe w mieszanych systemach analogowo-cyfrowych realizowanych na wspólnym podłożu stają się dużym problemem. W pracy zaproponowano metodę optymalizacji aktywnych układów tłumienia zakłóceń. Zilustrowano skuteczność działania metody na wybranym układzie i uzyskano ponad 9 dB poprawę tłumienia zakłóceń na częstotliwości 1GHz w porównaniu do znanych rozwiązań.

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• Active feedback noise control in the presence of impulsive disturbances

  Publikacja

  • M. Niedźwiecki
  • M. Meller

  - Rok 2015

  The problem of active feedback control of a narrowband acoustic noise in the presence of impulsive disturbances is considered. It is shown that, when integrated with appropriately designed outlier detector, the proposed earlier feedback control algorithm called SONIC is capable of isolating and rejecting noise pulses. According to our tests this guarantees stable and reliable operation of the closed-loop noise cancelling...

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• Robust algorithm for active feedback control of narrowband noise

  Publikacja

  • M. Meller
  • M. Niedźwiecki
  • M. Gajdzica

  - Rok 2015

  The problem of active control of narrowband acoustic noise is considered. It is shown that the proposed earlier feedback control algorithm called SONIC (self-optimizing narrowband interference canceller), based on minimization of the L2-norm performance measure, can be re-derived using the L1 approach. The resulting robust SONIC algorithm is more robust to heavy-tailed measurement noise, such as the αlpha-stable noise, than the...

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• Semi-adaptive feedback active control of MRI noise

  Publikacja

  • M. Meller
  • M. Niedźwiecki
  • T. Hirofumi
  • K. Yoshinobu

  - Rok 2011

  A feedback controller is proposed for cancellation of magnetic resonance imaging (MRI) noise. The design of the controller takes into account specific features of the MRI noise signal. Simulation results show that a considerable rejection rate of the MRI noise can be obtained.

• Multichannel self-optimizing active noise control scheme

  Publikacja

  • M. Meller
  • M. Niedźwiecki

  - Rok 2010

  The problem of cancellation of a nonstationary sinusoidal interference, acting at the output of an unknown multivariable linear stable plant, is considered. The proposed cancellation scheme is a nontrivial extension of the SONIC (self-optimizing narrowband interference canceller) algorithm, developed earlier for single-input, single-output plants. In the important benchmark case - for disturbances with randomwalk-type amplitude...

• Noise performance of continuous-time active-RC filters.

  Publikacja

  • S. Kozieł

  - Rok 2004

  W pracy przedstawiono metodę analizy właściwości szumowych filtrów aktywnych RC czasu ciągłego. Prezentowana procedura wykorzystuje model integratorowy, z odpowiednim dla tej klasy filtrów opisem macierzowym. Dokładność osiągniętych wyników teoretycznych dla przykładowego filtru potwierdzono rezultatami otrzymanymi przy pomocy symulatora SPICE.

• Iterative learning approach to active noise control of highly autocorrelated signals with applications to machinery noise

  Publikacja

  • A. Lasota
  • M. Meller

  - IET Signal Processing - Rok 2020

  This paper discusses the design and application of iterative learning control (ILC) and repetitive control (RC) for high modal density systems. Typical examples of these systems are structural and acoustical systems considered in active structural acoustic control (ASAC) and active noise control (ANC) applications. The application of traditional ILC and RC design techniques, which are based on a parametric system model, on systems...

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• An improved frequency estimator for an adaptive active noise control scheme

  Publikacja

  • M. Meller
  • M. Niedźwiecki

  - Rok 2010

  An improved frequency tracker is proposed for the recently introduced self optimizing narrowband interference canceller (SONIC). The scheme is designed for disturbances with quasi-linear frequency modulation and, under second-order Gaussian random-walk assumption, can be shown to be statistically efficient. One real-world experiment and several simulations show that a considerable improvement in disturbance rejection may be achieved...

• ESTIMATION OF NONSTATIONARY HARMONIC SIGNALS AND ITS APPLICATION TO ACTIVE CONTROL OF MRI NOISE

  Publikacja

  • M. Niedźwiecki
  • M. Meller
  • Y. Kajikawa
  • D. Łukwiński

  - Rok 2013

  A new adaptive comb filtering algorithm, capable of tracking the fundamental frequency and amplitudes of different frequency components of a nonstationary harmonic signal embedded in white measurement noise, is proposed. Frequency tracking characteristics of the new scheme are studied analytically, proving (under Gaussian assumptions and optimal tuning) its statistical efficiency for quasi-linear frequency changes. Laboratory tests...

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• Active Control of Highly Autocorrelated Machinery Noise in Multivariate Nonminimum Phase Systems

  Publikacja

  • M. Meller
  • A. Lasota

  - CIRCUITS SYSTEMS AND SIGNAL PROCESSING - Rok 2023

  In this paper, a novel multivariate active noise control scheme, designed to attenuate disturbances with high autocorrelation characteristics and preserve background signals, is proposed. The algorithm belongs to the class of feedback controllers and, unlike the popular feedforward FX-LMS approach, does not require availability of a reference signal. The proposed approach draws its inspiration from the iterative learning control...

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