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A Second Order Differential Microphone Technique for Spatially Encoding Virtual Room Acoustics
Room acoustics modelling using a numerical simulation technique known as the Digital Waveguide Mesh (DWM) has previously been presented as a suitable method for measuring spatial Room Impulse Responses (RIR) of virtual enclosed spaces. In this paper, a new method for capturing the DWM modelled soundfield using an array of spatially distributed pressure sensitive receivers is presented. The polar response of the formed 2nd order virtual microphone is measured and compared to the theoretical polar response. This approach is proven to be capable of decomposing the modelled soundfield into the second order spherical harmonic components that are typically associated with 2nd order Ambisonics.
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