A hybrid active noise control system

• Autorzy: Pawełczyk M.
• Języki publikacji: EN

Abstrakty

EN

In this article a hybrid noise control system for active headsets is designed. It combines analoque and discrete feedback techniques. However, both of these contributing parts are analysedseparately, before they are combined in a common system. The design of analoque controller starts from identyfying continuos time system, choosing a proper contoller structure, and finding its initial parameters with the aid of the system frequency characteristics. Final parameters are orginally searched in an optimisation process with a cost function and appropriate constrains formulated. The contoller is then practically realised in electronic circuit with a switched capacitor filter. The dicrete controller requires in turn modelling of the discretised plant including analoque filters and convertes. Well known Internal Model Control structure is used with Filtered-x LMS algorithm. The same structure operates in the hybrid system, where modelling of the analoque closed loop is required. Features of such systems are analysed. Efficiency of the algorithms is verified on a prototype of the active headsets. A variety of noises is considered, both generated and real-life. The experiments confirm good cooperation of the analoque and discrete techniques. The former is responsible for attenuating random broadband noise components. The latter, however, contributes to the overall attenuation, reducing, deterministic components to the acoustic background. The main contribution of this atricle is thus: reported in details original design of analoque active noise control system, its combination with supervisory discrete controller, successful practical realisation and high attenuation level with possibilityto easily tune basic performance parameters, what makes the system flexible and efficient in terms of various working environments.

Słowa kluczowe

EN

active noise control; active headsets; feedback; analoque control; discrete control; hybrid control; practical realisation

• Wydawca: Polish Academy of Sciences, Committee of Automatic Control and Robotics
• Czasopismo: Archives of Control Sciences
• Rocznik: 2003
• Tom: Vol. 13, no. 2
• Strony: 191--213
• Opis fizyczny: Bibliogr. 18 poz., rys.

Twórcy

autor

Pawełczyk M.

• Institute of Automatic Control, Silesian University of Technology, Gliwice, Poland,

Bibliografia

• [1] H. Bode: Network Analysis and Feedback Amplifier Design. N.Y., D. van Nostrand, 1945.
• [2] CH. Carme: Absorption acoustique active dans les cavities. Doctoral Thesis. Faculté des Sciences de Luminy, Université D’Aix-Marseille II, 1987.
• [3] J. Figwer and A. Niederliński: On the generation of high-quality scalar white noise series. Applied Stochastic Models and Data Analysis, (1992), 8311-8326.
• [4] C. Hansen and S.D. Snyder: Active Control of Noise and Vibration. E & FN Spon, an imprint of Chapman & Hall, Cambridge University Press, 1997.
• [5] I.M. Horowitz: Synthesis of Feedback Systems. London, Academic Press Inc., 1963.
• [6] S. Johansson, M.Winberg, T. Lagö and I. Claesson: A New Active Headset for a Helicopter Application. Proc. 5th Int. Congress on Sound and Vibration, Adelaide, Australia, (1997).
• [7] S.M. Kuo and D.R. Morgan: Active Noise Control Systems. Algorithms and DSP implementations. J. Wiley & Sons, N.Y, 1996.
• [8] MF10 Dual Universal Switched Capacitor Filter. USA, Maxim Integrated Products, 1996.
• [9] M. Morari and E. Zafiriou: Robust Process Control. Prentice-Hall, N.J, 1989.
• [10] P.A. Nelson and S.J. Elliott: Active Control of Sound. Cambridge, Academic Press Ltd, 1994.
• [11] M. Pawelczyk: Feedforward Algorithms in Active Noise Control. Proc. Int. Workshop on Acoustic Echo and Noise Control, Imperial College of Science, Technology and Medicine, London, UK, 1 (1997), 65-68.
• [12] M. Pawelczyk: Active Noise Control for Compact Acoustic Plants. Gliwice, Jacek Skalmierski Computer Studio, 1999.
• [13] M. Pawelczyk: Analysis of active noise control plants using process identification and signal processing methodology. Archives of Acoustics, 26(2), (2001), 143-164.
• [14] M. Pawelczyk, S.J. Elliott and B. Rafaely: Active Noise Control Using Feedback. Fixed and Adaptive Controllers. Technical Memorandum No. 822, Institute of Sound and Vibration Research, University of Southampton, 1997.
• [15] M. Pawelczyk: Analogue active noise control. Applied Acoustics, 63(11), (2002), 1193-1213.
• [16] B. Rafaely: Feedback Control of Sound. Ph.D. Thesis. Institute of Sound and Vibration Research, University of Southampton, 1997.
• [17] M.M. Seron, J.H. Braslavsky and G.C. Goodwin: Fundamental Limitations in Filtering and Control. London, Springer-Verlag London Ltd, 1997.
• [18] P. Wicher: Analogue-discrete algorithms of noise control in APHPD. Master Thesis. Gliwice, Institute of Automatic Control, 2000.