Quality and Usability

ASAR - Analysis and Synthesis of Directional Acoustic Room Properties

Motivation & Project Description

  • Directional analysis of acoustic room properties can bring significant improvements in acoustic measurement technology. The advantages compared to conventional measurement technologies will be investigated.
  • Combination of analysis and synthesis can be employed in auralisation of existing or artificially modified rooms. This enables e.g. prediction of influences of architectural design of rooms on their acoustic behavior (WYHIWYG - What You Hear Is What You Get), or creation of authentic environments for teleconference systems.

Project Results

  • VariSphear, a flexible spherical microphone array for capturing of multipoint room impulse responses
  • SOFiA sound field analysis toolbox for MATLAB, a free implementation of algorithms for processing spherical microphone array recordings; (sofia-py is the Python successor of SOFiA)

Time Frame: 10/2008 - 04/2011T-labs

Team Members: Sascha Spors, Jens Ahrens

Students: Benny Bernschütz

Project Manager: Christoph Pörschmann (Cologne University of Applied Sciences)

Partners: Cologne University of Applied Sciences, Institut für Nachrichtentechnik, Berlin University of Technology, Fachgebiet Audiokommunikation, WDR - Westdeutscher Rundfunk, Köln

Funding by: BMBF (Bundesministerium für Bildung und Forschung), Deutsche Telekom Laboratories


  • Bernschütz, B. (2009). Wellenfeldanalyse mit sphärischen Mikrofonarrays. Master's Thesis, Cologne University of Applied Sciences
  • Pörschmann, C. (2008). Ermittlung der Spiegelschallquellenpositionen aus den messtechnisch bestimmten Eigenschaften eines Raumes. In: Fortschritte der Akustik – DAGA 2008, DEGA e.V., D – Oldenburg, pp.147-148.
  • Pörschmann, C. (2007). Messtechnische Analyse der richtungsabhängigen Eigenschaften eines Raumes. In: Fortschritte der Akustik – DAGA 2007, DEGA e.V., D – Oldenburg, pp. 881-882.