## Active Noise Control PrimerActive noise control - the reduction of noise by generating an acoustic signal that actively interferes with the noise - has become an active area of basic research and engineering applications. The aim of this book is to present all of the basic knowledge one needs for assessing how useful active noise control will be for a given problem and then to provide some guidance for designing, setting up, and tuning an active noise-control system. Written for students who have no prior knowledge of acoustics, signal processing, or noise control but who do have a reasonable grasp of basic physics and mathematics, the book is short and descriptive. It leaves for more advanced texts or research monographs all mathematical details and proofs concerning vibrations, signal processing and the like. The book can thus be used in independent study, in a classroom with laboratories, or in conjunction with a kit for experiment or demonstration. Topics covered include: basic acoustics; human perception and sound; sound intensity and related concepts; fundamentals of passive noise-control strategies; basics of digital systems; basics of adaptive controllers; and active noise control systems. |

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### Contents

Introduction | 1 |

Contents | 2 |

Fundamentals of Sound | 7 |

Fundamentals of Noise Control | 36 |

Power Pressure and Hearing Loss | 41 |

Active Control Approaches | 51 |

Enclosed Space Noise Control | 67 |

Passive Noise Control Approaches | 74 |

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### Common terms and phrases

A-weighting acoustic energy acoustic power acoustic pressure acoustic wave active noise control actually adaptive algorithm adaptive feedforward active amplitude calculation canceling sound cancellation path transfer chapter control source convergence coefficient dB(A decibel digital filter digital system discrete discussion disturbance duct enclosed space enclosure energy ﬂow environment error microphone error sensor error signal error surface example feedforward active noise ﬁeld ﬁlter filter weights Fourier free space frequency components gradient descent harmonic hearing damage Hertz IIR filter impedance implementation increase inﬂuence input loudspeaker mathematical measurement microprocessor mode noise control system noise source output passive noise control path transfer function peak phase physical plot pressure ﬂuctuations problem quantity range reduced reference signal reﬂect resonance frequency response result sample rate shown in Figure sine wave sound attenuation sound field sound levels sound pressure levels sound source sound wave speed target transfer function unwanted noise voltage waveform wavelength