Acoustic contrast control in an arc-shaped area using a linear loudspeaker array

Zhao, Sipei; Qiu, Xiaojun; Burnett, Ian

doi:10.1121/1.4906184

Cited by 11 publications

(2 citation statements)

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“…In the publications [20], [21], the goal of the bright zone sound field manipulation is to obtain a certain geometrical distribution rather than to generate a given acoustical behaviour. The method further requires geometrical models of the acoustical environment under consideration which may become a concern in more complex, e.g.…”

Section: A Relation To Other Causal Methodsmentioning

confidence: 99%

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Causal MSE-Optimal Filters for Personal Audio Subject to Constrained Contrast

Widmark

2019

IEEE/ACM Trans. Audio Speech Lang. Process.

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A novel design method that generates causal precompensation filters is formulated. The resulting filters are constrained with respect to the amount of acoustic contrast they generate and are intended to be used for personal audio. The proposed method provides a more direct method for trading bright zone behavior against acoustic contrast as compared to other causal methods available. It also provides improved control over the temporal properties of the resulting filters as compared to the preexisting non-causal methods. The resulting filters are analyzed by means of simulations, based on measured impulse responses of the sound-system-room interactions. The results of the simulations are compared to simulations of a frequency-domain optimal method with comparable objective, as proposed by Cai et al. and the results of the comparison are explained using the design equations. It is shown that the proposed method is viable, but that unattainable contrasts have a detrimental impact on the spectral bright zone behavior. A few different strategies for dealing with this problem are also proposed. It is demonstrated that the detrimental effect of increasingly strict causality constraints mainly concerns the lower frequency bright zone behavior in the system under investigation, but that the very highest attainable contrast levels may also be reduced somewhat.

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Section: A Relation To Other Causal Methodsmentioning

confidence: 99%

“…Note that (35d) is always greater than or equal to zero so long as (21) holds, which it must do if we choose λ according to (12) and if W (q −1 ) is of full rank. If we find a filter R(q −1 ) such that L 3 = L T 2 = 0, no addition T (q −1 ) to that controller can result in a smaller value for L (R, T , λ).…”

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confidence: 99%