Sound rendering with early reflections extracted from a measured spatial room impulse response

Otto Puomio, Tapani Pihlajakuja, Tapio Lokki

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

7 Citations (Scopus)
14 Downloads (Pure)


The acoustic properties of early reflections are not trivial to model when one creates plausible sounding virtual acoustic environments. This paper proposes a novel solution to be used with existing room acoustic modeling systems, such as image-source method, where the synthetic filters for reflection surfaces are replaced with captured real reflection responses. The reflections are extracted from a measured spatial impulse response by analyzing the sound pressure level and the direction-of-arrival to detect prominent individual early reflections. These detected reflections are extracted with a suitable window and are applied in room acoustic modeling algorithms as FIR filters. The presented concept is validated with a listening test, suggesting the material filter length must be over 2 ms. However, an all-round filter length could not be determined due to the dependencies on sound signal content and the room. Further research is therefore required to study the found dependencies, to find the optimal extraction parameters and to validate the filters in practical use-cases.
Original languageEnglish
Title of host publication2021 Immersive and 3D Audio: from Architecture to Automotive (I3DA)
Number of pages8
ISBN (Electronic)978-1-6654-0998-8
ISBN (Print)978-1-6654-0999-5
Publication statusPublished - 10 Sep 2021
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Immersive and 3D Audio - Bologna, Italy
Duration: 8 Sep 202110 Sep 2021


ConferenceInternational Conference on Immersive and 3D Audio
Abbreviated titleI3DA


  • Three-dimensional displays
  • Finite impulse response filters
  • Filtering algorithms
  • Acoustic measurements
  • Rendering (computer graphics)
  • Reflection
  • Acoustics


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