Using HRTFs for virtual sound source positioning Lecture Example

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Presentation transcript:

Using HRTFs for virtual sound source positioning Lecture Example Franz Zotter

HRTFs / HRIRs Filters/transfer functions to ear signals for source direction, free field Using HRTFs for virtual source positioning Aalto 2018 Franz Zotter

Why? BBC „binaural sound“ example: KU100 dummy head Recording like radio drama (performance) BBC turning forest objects with trajectories etc., artificial components can be interactive (head rotation, controllers, etc) Other reasons: Room and loudspeakers for electroacoustic performance or listening test might be unavailable/difficult to bring together Using HRTFs for virtual source positioning Aalto 2018 Franz Zotter

How Lateral: TOA (ITD) ILD: at frequencies higher than 1kHz, attenuation on distant ear Using HRTFs for virtual source positioning Aalto 2018 Franz Zotter

How Learning and supplementary material, source code http://iaem.at/Members/zotter/using-hrtfs Using HRTFs for virtual source positioning Aalto 2018 Franz Zotter

How Learning and supplementary material, source code http://iaem.at/Members/zotter/using-hrtfs KU100 dummy head measurements (Benny Bernschütz, TH Cologne 2013) Using HRTFs for virtual source positioning Aalto 2018 Franz Zotter

How At frequencies even higher (above 3kHz) Spectral detail (Satarzadeh+Algazi+Duda 2007) Maybe easier to measure? Using HRTFs for virtual source positioning Aalto 2018 Franz Zotter

How 8kHz: cp. Blauert (spatial hearing) Resonances+notches (front) ARI Vienna Using HRTFs for virtual source positioning Aalto 2018 Franz Zotter

Implementation examples Pd: KU100 HRIRs Franz‘s individual ARI HRIRs Free VST Plugins: psypan BinAural (Tomasz Wozniak, open source – try to read) Sennheiser AMBEO Orbit IEM Binaural Decoder (Ambisonic, Zaunschirm+Schörkhuber 2018?, JASA) Ircam Spatialisateur - spat (allows indiv. HRIRs) TuneIn 3D - interpolation Using HRTFs for virtual source positioning Aalto 2018 Franz Zotter

Why does it not always externalize well? Median plane is diffucult! Is there a room response? Sinker, Catic, … Divergence between simulated and headphone-listening room? Stephan Werner Head tracking? Begault, Völk, … Headphone EW Bernschütz, Brinkmann, indiv: Hipaaka - hefio Individual HRIRs/BRIRs? Begault,Völk,Hassager, … Using HRTFs for virtual source positioning Aalto 2018 Franz Zotter

Learning material and exam http://iaem.at/Members/zotter/using-hrtfs learning and supplementary material (source code, data, plugin comparison) # micro credits/ECTS? Using HRTFs for virtual source positioning Aalto 2018 Franz Zotter