PowerPoint Presentation

The use of outdoor sound propagation modelling for auralizing road traffic noise results from the LISTEN-project

Jens ForssnResearch partnersStockholm University (coordinator)Chalmers University of TechnologyKTH Royal Institute of Technologythe Interactive InstituteKonstfack University College of Arts, Crafts and Design

Public partnersSwedish Road AdministrationSwedish Rail AdministrationCity of StockholmA Multidisciplinary Research Project

Commercial partnersF-Ingemansson ABRambll Denmark A/SWSP Sweden ABLISTEN Auralization of Urban SoundscapesAuralization basics

In general (the heart of auralization):

r is received (mono) signals is source signalh is impulse response (IR) of system

3

Omni-directional point source at low speed, in free fieldEx)Free field IR:

Tonal component:

From here we see thatDoppler shift can beimplemented as resampling

4

Doppler shift by resampling

First sample

Second samplef = 500 HzL = 10 mU = 70 km/h

5Propulsion noise (framdrivningsbuller) Engine, transmission, air intake, exhaust Rolling noise (dck-vgbuller) Depends on combination of tyre and road

Road vehicle sourcesExtracted from recordings6Air attenuationGround effect Directivity Doppler effectDistance/spherical spreadingHRTF* (HRTF of recorded signal: )Auralization process starting from given source signal

Auralization process Including:*head related transfer function

7In SummaryThe LISTEN project: Auralization of urban soundscapes

Methods for perceptual validation of auralization [see final report]

LISTEN-auralizations of car passages shown to have high perceptual validity [see final report]

Funded by:

9