Acoustics

There are three main activities:

• Active Noise Control
• Sound Source Localization
• Signal Processing for Audio and Speech Signals (SPASS)

Active Noise Control

In Active Noise Control, secondary sources such as loudspeakers are used to modify the existing sound field in order to achieve a reduction of the noise or to obtain desired sound. Potentially more compact systems can be obtained with Active Structural Acoustic Control, where, instead of using loudspeakers, structural actuators are used to excite the structure directly. Research topics are smart structures for noise reduction, efficient multichannel controller implementations where the control configuration can be both centralized and decentralized, hardware implementation of active noise control algorithms, and the integration of all actuators, sensors, and electronics with the structure, leading to the ultimate goal of low-cost "active wall paper". Contact: Arthur Berkhoff

Sound Source Localization

A vibrating surface generates in general sound in its surroundings. This sound can be "pleasant sound", as e.g. music from a loudspeaker box, or "unpleasant sound" as e.g. noise from a rotating disc or traffic noise. In both cases (i.e. music or noise) it is desired to have a good knowledge of the sound sources at the surface. This can be achieved by measuring the sound pressure or the accompanying particle velocity in a grid near the surface of the vibrating object. In our research program we use as a sensor for the particle velocity the Microflown, being a new, simple and promising device, invented and developed by H.E. de Bree and co-workers at our university. The research is done in close cooperation with the groups Applied Mechanics and Engineering Fluid Dynamics (both Mechanical Engineering/Tijdeman, Venner) at the UT in a STW project. Contact: Erik Druyvesteyn

Signal Processing for Audio and Speech Signals

At present, there are no concrete projects. Students who wish to do a project in this area can contact Raymond Veldhuis

Projects

• Active Noise Control
• Signal Processing for Audio and Speech Signals
• Sound Source Localization
• Acoustic Array for Sound Imaging
  

People

• Arthur Berkhoff
• Erik Druyvesteyn
• Johan Wesselink
• Joost Kauffman
• Raymond Veldhuis

Last modified: 2011-11-15 (21:41) by Geert Jan Laanstra