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

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Presentation transcript:

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

Research partners …Stockholm University (coordinator) …Chalmers University of Technology …KTH Royal Institute of Technology …the Interactive Institute …Konstfack University College of Arts, Crafts and Design Public partners …Swedish Road Administration …Swedish Rail Administration …City of Stockholm A Multidisciplinary Research Project Commercial partners …ÅF-Ingemansson AB …Ramböll Denmark A/S …WSP Sweden AB LISTEN – Auralization of Urban Soundscapes

Auralization – basics In general (the heart of auralization): r is received (mono) signal s is source signal h is impulse response (IR) of system

Omni-directional point source at low speed, in free field Ex) Free field IR: Tonal component: From here we see that Doppler shift can be implemented as resampling

Doppler shift by resampling First sample Second sample f = 500 Hz L = 10 m U = 70 km/h

Propulsion noise (framdrivningsbuller) Engine, transmission, air intake, exhaust… Rolling noise (däck-vägbuller) Depends on combination of tyre and road Road vehicle sources Extracted from recordings

Air attenuation Ground effect Directivity Doppler effect Distance/spherical spreading HRTF* (HRTF of recorded signal: ) Auralization process starting from given source signal Auralization process Including: *head related transfer function

In Summary The 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: