Auralization Technology Maarten Hornikx April 4, 2019
Introduction Auralization technology Discussion/Next steps Group expertise Co Computational and Ex Experimental Ac Acoustics Methods Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Group expertise Computational and Co Experimental Ex Acoustics Methods Ac To Tools for researchers Fund Fundament ental and nd an and designers applied resear ap arch Ac Acoustic prediction software Pr Propagation effects Acoustic measurement software Ac Auralization Au www.acoustics-engineering.com Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Group overview Staff Project researchers Jeroen Maarten Hornikx Constant Hak Donners PhD students Post-docs Baltazar Raúl Jikke Chang Ella Fotis Jieun Reinten Braat-Eggen Yang Briere Pagán Muñoz Liu Georgiou Indra Qin Sai Huiqing Wouter Marc open JinJack Sihar Yi Trikootam Wang Wittebol position Tan van Baelen www.tue.nl/buildingacoustics Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization example Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization definition/origin Auralization is the process of rendering audible, by physical or mathematical modeling, the sound field of a source in a space. [1] Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Role of auralization in the urban sound community Auralization as communication tool Auralization as (perceptual) research tool Empa Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Contents of presentation Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Contents of presentation ◮ State-of-the-art in auralization technology, specifically for urban sound Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Contents of presentation ◮ State-of-the-art in auralization technology, specifically for urban sound ◮ Challenges in auralization technology Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Contents of presentation ◮ State-of-the-art in auralization technology, specifically for urban sound ◮ Challenges in auralization technology ◮ Discussion and next steps Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Overview Contents Introduction Auralization technology Overview Auralization components Reproduction Discussion/Next steps Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Overview Auralization chain Source Path Receiver Reproduction Georgiou [2] Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Contents Introduction Auralization technology Overview Auralization components Reproduction Discussion/Next steps Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Source ◮ Measurements - Near the source [3] - At a receiver position [4,5] Meng et al. [4] Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Source ◮ Predictions - Full physical modelling (as in musical acoustics [6,7] - Spectral Modeling Synthesis (SMS): shaped noise plus modal components ([8] and refs. therein) ◮ Mixed approach - Granular synthesis [9] Pieren [8] Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Path: Measurements ◮ Impulse response measurements Georgiou [2] Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Path: Predictions ◮ Full physical modelling (wave-based model) ([10],refs in [11]) ◮ Geometrical acoustics (typically noise-mapping software approaches) (refs in [11]) Hornikx [12] https://sagetechnologies.com/whats-new/122-olive-tree-lab- terrain Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Receiver: Measurements Closely linked to the reproduction system ◮ Capturing spatial sound field by array sensor [13] ◮ Individual HRTFs or HRTF from dummy head [14,22] Sakamoto et al. [13] Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Receiver: Predictions Closely linked to the reproduction system ◮ Computing spatial sound field by receiver array [14] ◮ Modelled HRTFs [15], anthropometry based [16] Sheaffer et al. [17] Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Combinations of approaches For example Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Combinations of approaches For example ◮ Measured source - predicted path - predicted HRTF Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Combinations of approaches For example ◮ Measured source - predicted path - predicted HRTF ◮ Predicted source - predicted path - measured individual HRTF Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Combinations of approaches For example ◮ Measured source - predicted path - predicted HRTF ◮ Predicted source - predicted path - measured individual HRTF ◮ Predicted source - predicted path + HRTF Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Auralization components Combinations of approaches For example ◮ Measured source - predicted path - predicted HRTF ◮ Predicted source - predicted path - measured individual HRTF ◮ Predicted source - predicted path + HRTF ◮ Measured source + path + HRTF Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Reproduction Contents Introduction Auralization technology Overview Auralization components Reproduction Discussion/Next steps Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Reproduction Reproduction system Headphone reproduction Multispeaker reproduction - Reproducing at ears directly - Reproducing sound field at ’sweet spot’ in room - HRTF predictions/measurements - Input from spherical array micro- phones Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Reproduction Challenges Moving source, moving receiver, rotating receiver Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Reproduction Challenges Moving source, moving receiver, rotating receiver ◮ Uncontrolled: Incorporated in measurements Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Reproduction Challenges Moving source, moving receiver, rotating receiver ◮ Uncontrolled: Incorporated in measurements ◮ Controlled: Incorporation in predictions Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
Introduction Auralization technology Discussion/Next steps Reproduction Challenges Moving source, moving receiver, rotating receiver ◮ Uncontrolled: Incorporated in measurements ◮ Controlled: Incorporation in predictions - Time-variant filtering [18] or convolving with discrete point-to-point path[10] Maarten Hornikx TU/e Building Acoustics research group Auralization Technology
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