This study improves the performance of a previously developed acoustic actuator in the presence of an acoustic duct system with strong pressure coupling. The speaker dynamics and the acoustic duct dynamics are first modeled separately. The two systems are then coupled, and the resulting system is modeled. A velocity sensor is developed and used in feedback compensation. The resulting speaker sy...

This study introduces optical feedback interferometry as a simple and effective technique for the two-dimensional visualisation of acoustic fields. We present imaging results for several pressure distributions including those for progressive waves, standing waves, as well as the diffraction and interference patterns of the acoustic waves. The proposed solution has the distinct advantage of extr...

This study investigated the effectiveness of utilizing acoustic measures as an objective tool in monitoring speech errors and providing visual feedback to enhance speech training and aural rehabilitation of children with hearing impairment. The first part of the study included a comprehensive description of the acoustic characteristics related to the speech deficits of a hearing impaired child....

The modelling and simulation of the Active Noise Control (ANC) using the fixed feedback control for a hard-wall one-dimensional acoustic duct system is discussed. The state-space models as well as the transfer function description are derived based on physical principles. The coupled dynamic between the cancelling loudspeaker and the acoustic duct is explicitly expressed in these models. Beside...

The addition of multimodal feedback during navigation in a virtual environment is fundamental when aiming at fully immersive and realistic simulations. Several visual, acoustic, haptic or vibrotactile perceptual cues can be generated when walking over a ground surface. Such sensory feedback can provide crucial and varied information regarding either the ground material itself, the properties of...

In this paper we discuss the sound absorption property of arrays of micro-acoustic actuators at a control surface. We use the wave equation over the half plane for the velocity potential with a boundary dissipation by a proportional pressure feedback law along the half plane boundary. The feedback gain over the array is described by a distributed shape function. We develop a computational metho...

Analysis of measured kinematic parameters is commonly used in competitive sports to optimize athletes’ performance. The progress in technology offers new ways for displaying feedback information to athletes. In rowing, synchronous visual feedback is regularly used, but the presentation of acoustic information is a new and promising application for technique training and monitoring. This paper d...

An important aspect of the sound of the acoustic guitar is the beating caused by string interaction. In this paper, we present a coupled string model for the acoustic guitar that includes the body in the feedback loop. Constraints on the model parameters are determined using Finite Element analysis of the saddle. Key−Words: Music, Sound synthesis, Physical modeling, String Coupling, Waveguide

The German sibilant /∫/ is produced with a constriction in the postalveolar region and often with protruded lips. By covarying horizontal lip and tongue position speakers can keep a similar acoustic output even if the articulation varies. This study investigates whether during two weeks of adaptation to an artificial palate speakers covary these two articulatory parameters, whether tactile land...