Understanding Active Noise Cancellation
Understanding Active Noise Cancellation Provides a concise introduction to the fundamentals and applications of active control of vibration and sound for the non-expert. It is also a useful quick reference for the specialist engineer. The book emphasises the practical applications of technology, and complex control algorithms and structures are only discussed to the extent that they aid understanding. Extensive recommendations for further reading on the subject are provided, but the text will stand alone for those seeking an overview of the key issues: fundamentals, control systems, transducers, applications and possible future directions.
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achieve acoustic modes active control system active noise cancellation active noise control actuators adaptive algorithm aircraft attenuation broadband Cazzolato control filter control signal control source convergence coefficient cost function digital filter discussed duct effect electronic controller enclosure energy density error microphone error sensor error signal error surface feedback control feedback systems filter weights FIR filter frequency range genetic algorithm global gradient group delay headset hearing protectors illustrated in Figure implementation impulse response input loudspeaker low frequency matrix measured microphone minimise mode shape multi-channel noise control system noise reduction noise source number of control optimisation optimum panel performance piezoelectric potential energy primary source problem pulse radiation impedance radiation modes random noise reference sensor reference signal resonance result sample rate shown in Figure Sound and Vibration sound field sound intensity sound pressure sound radiation sound source structural modes structural vibration tonal noise transfer function unwanted noise vector velocity vibration control