All Outputs (45)

Optimising sound field synthesis using acoustic cross-energy metrics
Presentation / Conference
Hargreaves, J. Optimising sound field synthesis using acoustic cross-energy metrics. Presented at Forum Acusticum, Online

When evaluating or optimising the accuracy of sound field synthesis, it is commonplace to only consider the error in the pressure field that is reproduced. While this is justifiable perceptually - pressure is what we hear - it neglects error in parti... Read More about Optimising sound field synthesis using acoustic cross-energy metrics.

Non-cuboid iterative room optimizer
Presentation / Conference
Petrolli, R., D'Antonio, P., Storyk, J., Hargreaves, J., & Betcke, T. Non-cuboid iterative room optimizer. Presented at Forum Acusticum, Online

In small room acoustics, the range from the first resonant frequency up to the Schroeder frequency is dominated by modal resonances and the Speaker-Boundary Interference Response (SBIR). Both are very sensitive to the positioning of sources, receiver... Read More about Non-cuboid iterative room optimizer.

Measurement of the elastic modulus of homogeneous materials by a bending wave speed method
Presentation / Conference
Esposito, A., Hargreaves, J., Romano, R., & Cicero, A. Measurement of the elastic modulus of homogeneous materials by a bending wave speed method. Presented at Forum Acusticum, Online

Elastic modulus is one of the most important mechanical properties of homogeneous materials. It describes the dynamic behaviour of elastic and viscoelastic materials, strongly affecting both panel modes and coincidence frequencies, so is an important... Read More about Measurement of the elastic modulus of homogeneous materials by a bending wave speed method.

Literature review of Direct Field Acoustic Noise (DFAN) testing
Report
Hargreaves, J. Literature review of Direct Field Acoustic Noise (DFAN) testing

This report gives a comprehensive review of the state of the art in Direct Field Acoustic Noise (DFAN) testing based on published literature and product data. This is supplemented by background theory and selected best practice from other related dis... Read More about Literature review of Direct Field Acoustic Noise (DFAN) testing.

Metric based development of acoustic lenses and waveguides
Presentation / Conference
MacDonald, L., Oclee-Brown, J., & Hargreaves, J. Metric based development of acoustic lenses and waveguides. Presented at Reproduced Sound 2022, Bristol

This paper investigates and develops an automated design procedure for acoustic waveguides, to modify them to be better at supporting single parameter (1P) wave propagation. The design process is driven by two new performance metrics that are calcula... Read More about Metric based development of acoustic lenses and waveguides.