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Acoustics Sound

By J. H Poynting and J. J. Thomson

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Additional info for A text-book of physics: Sound (Fourth Edition)

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Number of control sources and error sensors (increasing the number requires a smaller convergence coefficient). Cancellation path transfer function amplitude (an increased gain in this path requires a reduced convergence coefficient). Time delay in the cancellation path (an increased time delay requires a reduced convergence coefficient). Digital filter length (increasing the length requires reducing the convergence coefficient). Ratio of sampling rate to reference signal frequency (an increased ratio requires a reduced convergence coefficient.

Acoustic feedback can occur in a feedforward active noise control system if a microphone is used to provide the system reference signal and some of the noise generated by the control source reaches the microphone. If the acoustic feedback is small relative to the primary noise signal at the reference microphone location, then one is just restricted in the choice of controlfílter types that may be used (see Chapter 3). If the feedback signal is relatively large (the exact size is system dependent), then the control system may become unstable, regardless of whether an FIR or an IIR filter is used.

For enclosed sound fields, total potential energy, rather than the sum of squared sound pressures at a number of locations may be used as the quantity to be minimised (cost function). For sound radiated by a source outdoors, the cost function may be total radiated sound power. The minimum valué of the cost function is calculated for each control source configuraron tested. The best control source confíguration can then be determined by trial and error or a more sophisticated search procedure such as a genetic algorithm may be used as described by Simpson and Hansen (1996) and Hansen et al.

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A text-book of physics: Sound (Fourth Edition) by J. H Poynting and J. J. Thomson


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