Directional sound sources using real-time beamforming control

Arthur P. Berkhoff, R. van der Rots

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

4 Citations (Scopus)
28 Downloads (Pure)


Quiet vehicles may be noticed relatively late and therefore constitute a potential risk for vulnerable road users such as pedestrians and bicyclists. The ideal acoustic warning signal generator notifies vulnerable road users while minimizing noise pollution. Several sensor systems exist which are able to reveal the position of the vulnerable road users, which information can be used by the warning signal generator. The warning signal generator is designed to generate the specified warning signal at the location of the vulnerable road user while the acoustic response at other locations is minimized. The directional sound beam was realized with an array of controlled actuators, using least-squares beamforming methods. The particular least-squares methods are based on measured transfer functions between the actuators and the acoustic sensors. Different actuator technologies were evaluated. Changes of the relative positions of the vehicle and the vulnerable road user require continuous adjustments of the sound beam. The latency of the beamforming method with respect to an adjusted beaming direction is an important factor for the present application. Different methods to generate the sound beam are described and advantages of the different beamforming methods in experimental results are shown. Rapid real-time adjustment of the beaming direction is demonstrated.
Original languageEnglish
Title of host publicationProceedings Internoise 2013
Place of PublicationInnsbruck, Austria
Publication statusPublished - 15 Sep 2013
Event42nd International Congress and Exposition on Noise Control Engineering, INTERNOISE 2013: Noise Control for Quality of Life - Innsbruck, Austria
Duration: 15 Sep 201318 Sep 2013
Conference number: 42

Publication series

Namepaper no 0276


Conference42nd International Congress and Exposition on Noise Control Engineering, INTERNOISE 2013
Abbreviated titleINTERNOISE 2013
Internet address


  • IR-94027
  • METIS-308935


Dive into the research topics of 'Directional sound sources using real-time beamforming control'. Together they form a unique fingerprint.

Cite this