List of Figures

Chapter 1: An Overview of ASVC: from Laboratory Curiosity to Commercial Products

Figure 1.1: JMC theory primary sources Q in a volume V enclosed by a Huygens surface S with monopole distribution q ₀ and dipole distribution q1
Figure 1.2: Principle of active feedforward cancellation of sound in a duct
Figure 1.3: ANC in a duct by adaptive feedforward control with feedback cancellation and error path identification for the filtered-x LMS algorithm
Figure 1.4: Adaptive noise cancelling
Figure 1.5: Active cancellation of (quasi)periodic noise by tracking control with sync input and waveform synthesis
Figure 1.6: Crosstalk cancellation in stereophonic sound field reproduction with loudspeakers by prefiltering. S = S( ?) and A = A( ?) are nearside and farside transfer functions, respectively, between loudspeakers and eardrums; circles to the left from the loudspeakers indicate filters with inscribed transfer functions, C = C( ?) = -A( ?)/S( ?)
Figure 1.7: Spillover attempting to control mode N at its resonance frequency f _N also excites neighbouring modes N-1 and N+1 with lower, but finite amplitudes
Figure 1.8: Five-year cumulants of ANVC publications, based on the author's data files

Figure 2.1: Active noise control structure- (a) Schematic diagram; (b) block diagram
Figure 2.2: Interference pattern with an SISO ANC system, incorporating the optimal contoroller
Figure 2.3: Interference pattern with an SIMO ANC system incorporating the optimal controller, with the primary source at P(0, 0) and the detector...

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