The implementation of an active noise control system in the cavity of a double glazing window has been investigated. In a preliminary theoretical analysis the spatial distribution of both the control loudspeakers and the error microphones of the control system has been optimised with respect to the reduction of the acoustic potential energy in the cavity between the two glass plates. It appears from the experimental analysis that the optimised control configuration yields far better increases in the sound transmission loss than a randomly chosen configuration. The obtained reductions in the transmitted sound power illustrate the potentials of active noise control for improving the sound insulation characteristics of double glazing windows.
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