Ambisonics Directional Room Impulse Response as a New SOFA Convention
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1 Ambisonics Directional Room Impulse Response as a New Convention Andrés Pérez López 1 2 Julien De Muynke 1 1 Multimedia Technologies Unit Eurecat - Centre Tecnologic de Catalunya Barcelona 2 Music Technology Group Universitat Pompeu Fabra Barcelona 144th AES Convention 25th May 2018
2 Outline Introduction Presentation Ambisonics DRIRs Ambisonics DRIRs
3 Outline Introduction Presentation Ambisonics DRIRs Ambisonics DRIRs
4 Presentation About us
5 Presentation About us Main objectives of BINCI project: Developing production tools to encourage the creation of binaural contents Creating three binaural productions showcased and tested in three cultural and touristic sites Integrating software and hardware solutions for a complete immersive audio experience
6 BINCI St Andrews Castle
7 BINCI Die Alte Pinakothek
8 BINCI Fundació Miro
9 Outline Introduction Presentation Ambisonics DRIRs Ambisonics DRIRs
10 Ambisonics DRIRs Impulse Responses HOW? Logarithmic sweep sine technique for recording the RIR 1 All microphone s capsules recording at the same time, for each source position A to B format conversion either on live inputs or in post-processing Impulse is obtained after deconvolution on each Ambisonics channel Each source position is measured using a combination of laser meters that give the azimuth, elevation and distance 1 Simultaneous Measurement of Impulse Response and Distortion with a Swept-Sine Technique, A. Farina, Proc. AES 108th conv, Paris, France
11 Ambisonics DRIRs Impulse Responses WHAT FOR? Auralization 2 Room acoustics analysis 3 and modelling 4 Recording room acoustics for posterity 5 2 Object-based reverberation encoding from first-order Ambisonic RIRs, P. Coleman, A.Franck, D.Menzies, P.Jackson, Proceedings of the 142nd AES Convention, Berlin, Germany 3 Measurement of 3D Room Impulse Responses with a Spherical Microphone Array, J.J. Embrechts, Euronoise Diffuse Field Modeling Using Physically-Inspired Decorrelation Filters : Improvements to the Filter Design Method, D. Romblom, JAES, Vol. 65, No. 11, November Recording Concert Hall Acoustics for Posterity, M. Gerzon, JAES Volume 23 Issue 7 pp. 569, 571; September 1975
12 Ambisonics DRIRs Eurecat: 3D Tent
13 Outline Introduction Presentation Ambisonics DRIRs Ambisonics DRIRs
14 The problem Different conventions for different HRTF datasets...
15 The problem (again) Kemar (diffuse)
16 The problem (again) SADIE (Subject 001)
17 Conventions Majdak, Piotr, et al. Spatially oriented format for acoustics: A data exchange format representing head-related transfer functions. Audio Engineering Society Convention 134. Audio Engineering Society, AES Standard
18 Conventions
19 The problem (again) Different conventions for different AmbisonicsDRIR datasets...
20 The problem (again) Main Church (S3A)
21 The problem (again) Guildhall Court Chamber (OpenAIR)
22 The problem (again) QMUL Octogon (Isophonics)
23 Candidates? Requirements: 1. Multiple speakers 2. Multiple microphone positions 3. Audio in Ambisonics domain 4. Ambisonics-related information
24 Candidates? Convention candidates: SingleRoomDRIR
25 Candidates? Convention candidates: SingleRoomDRIR MultiSpeakerBRIR
26 Candidates? Convention candidates: SingleRoomDRIR MultiSpeakerBRIR GeneralFIRE
27 Proposal AmbisonicsDRIR convention (v0.1)
28 Proposal Based on GeneralFIRE, with following additions: Global attributes: AmbisonicsOrder, AmbisonicsMicrophoneModel, AmbisonicsConversionMethod Variables: ListenerUp, ListenerView, EmitterUp, EmitterView Data attributes: ChannelOrdering, Normalization
29 Proposal Data type: FIRE M: Number of measurements (Listener positions) R: Number of Receivers (Ambisonics channels) E: Number of Emitters (speakers) N: Number of audio samples
30 Examples Main Church (S3A)
31 Examples
32 Examples M: 1 R: 4 E: 10 N: ListenerView: [0, 1, 0] (type: cartesian, unit: meter)
33 Examples Guildhall (OpenAIR)
34 Examples
35 Examples M: 4 R: 4 E: 3 N:
36 Examples QMUL Octogon (Isophonics)
37 Examples
38 Examples M: 169 R: 4 E: 1 N: n
39 Links Matlab/Octave API: MO C++ API: Cpp
40 Thanks. Questions?
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