Download Directional Source Simulation in FDTD Room Acoustic Modeling via Weighted First-Order Reflections This paper proposes a means of simulating directional sources in Finite Difference Time Domain (FDTD) based acoustic models for impulse response (IR) calculation which, unlike other currently available methods, is able to accommodate highly irregular directivity patterns. Weighted numerical free-field IRs are applied to the simulation of first-order reflections at the boundaries of a modeled acoustic domain such that the continuing interior wave field is that which would be produced by a directional sound source. Numerical results demonstrate the application of this approach for a 2-Dimensional wave field, implementing both simple and irregular (e.g. highly directional, discontinuous) sound source directivity patterns.
Download Characterisation and Excursion Modelling of Audio Haptic Transducers Statement and calculation of objective audio haptic transducer performance metrics facilitates optimisation of multi-sensory sound reproduction systems. Measurements of existing haptic transducers are applied to the calculation of a series of performance metrics to demonstrate a means of comparative objective analysis. The frequency response, transient response and moving mass excursion characteristics of each measured transducer are quantified using novel and previously defined metrics. Objective data drawn from a series of practical measurements shows that the proposed metrics and means of excursion modelling applied herein are appropriate for haptic transducer evaluation and protection against over-excursion respectively.