AES 143 Convention e-Brief: 357 A database of head-related ... · ITD (s) 20 Elevation, (deg.)...
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A database of head-related transfer function (HRTF) and morphological measurements Rahulram Sridhar, Joseph G. Tylka, and Edgar Y. Choueiri 3D Audio and Applied Acoustics Laboratory, Princeton University AES 143 Convention e-Brief: 357 Website: www.princeton.edu/3D3A This work was sponsored in part by the Sony Corporation of America and approved by the Institutional Review Board at Princeton University 2 .2 Measurement Setup 1 Introduction An individual’s HRTFs describe the idiosyncratic filtering of incident sound waves by the individual's morphology. HRTFs are widely used to synthesize binaural signals for spatial audio reproduction, and are generally acquired either through acoustical measurements [1] or by modeling from morphological data [2, for example]. Acoustically measured HRTFs: • are accurate but difficult to acquire, • serve as benchmarks for validating modeled HRTFs, • and serve as training data for developing HRTF models. Publicly available databases provide measured HRTFs for many human subjects and mannequins [3]. However, few such databases also include corresponding morphological data. Here, we describe an ongoing project to measure HRTFs and corresponding 3D morphological scans of subjects, which we provide as a freely available database. MORPHOLOGICAL SCANS 4 Data Visualization Reference-grade Consumer-grade B&K HATS 4128C -800 80 -400 50 0 360 ITD ( s) 20 Elevation, (deg.) 400 270 -10 800 180 -40 Azimuth, (deg.) 90 -70 0 Human subject 3 Data Processing MORPHOLOGICAL SCANS Import head and torso scans with and without wig cap Import pinnae scans 2 .1 Measurement Details HRTFs Measurement room Anechoic chamber Number of directions 648 (72 azimuths × 9 elevations) Loudspeakers 9 × Genelec 8010A Binaural microphones Theoretica Applied Physics BACCH-BM Pro Excitation signal Multiple exponential sine sweeps [1] Duration: 500 ms (200 ms inter-sweep delay) Nominal frequency range: 20 Hz to 48 kHz Sampling rate: 96 kHz Data export format SOFA [3] Morphological Scans Head and torso scanner PrimeSense Carmine 1.09 Pinna scanner Artec Space Spider Scanning software Skanect Pro; Artec Studio 12 Pro Data export format PLY Turntable 0.76 m 45 o -57 o Circular arc with loudspeakers Headrest Drum-throne seat Outline ET250-3D turntable HRTFs HRTFs Invert f (kHz) β 10 -3 0 0.05 0.1 30 32 with regularization [4] Export HRIRs, RIRs and BIRs, in SOFA ✻ Convolve Import reference impulse responses (RIRs) Import binaural impulse responses (BIRs) Window 10 ms Tukey 5 Summary References [1] Majdak, P., Balazs, P., and Laback, B., J. Audio Eng. Soc., 55(7/8), pp. 623–637, 2007. [2] Sridhar, R. and Choueiri, E. Y., in Audio Eng. Soc. Convention 143, 2017. [3] https://www.sofaconventions.org/mediawiki/index.php/Files [4] Farina, A., in Audio Eng. Soc. Convention 122, 2007. We have begun an on-going project to measure HRTFs and 3D scans of the head and upper torso of humans and mannequins, and compile the data into a freely available database which may be downloaded from: http://www.princeton.edu/3D3A/HRTFMeasurements.html ↣ Merge Export consumer-grade scan in PLY Align y-axis = interaural axis y x z q f interaural axis 0.5-0.7 m wig cap alignment marker PrimeSense Carmine 1.09 Artec Space Spider 0.2-0.3 m Export reference-grade scan in PLY
Transcript of AES 143 Convention e-Brief: 357 A database of head-related ... · ITD (s) 20 Elevation, (deg.)...
A database of head-related transfer function (HRTF) and morphological measurements
Rahulram Sridhar, Joseph G. Tylka, and Edgar Y. Choueiri
3D Audio and Applied Acoustics Laboratory, Princeton University
AES 143 Convention e-Brief: 357
Website: www.princeton.edu/3D3AThis work was sponsored in part by the Sony Corporation of America and approved by the Institutional Review Board at Princeton University
2 .2 Measurement Setup1 IntroductionAn individual’s HRTFs describe the idiosyncratic filtering of incident sound waves by the individual's morphology. HRTFs are widely used to synthesize binaural signals for spatial audio reproduction, and are generally acquired either through acoustical measurements [1] or by modeling from morphological data [2, for example].Acoustically measured HRTFs:• are accurate but difficult to acquire,• serve as benchmarks for validating modeled HRTFs,• and serve as training data for developing HRTF models.Publicly available databases provide measured HRTFs for many human subjects and mannequins [3]. However, few such databases also include corresponding morphological data. Here, we describe an ongoing project to measure HRTFs and corresponding 3D morphological scans of subjects, which we provide as a freely available database.
MORPHOLOGICAL SCANS
4 Data Visualization
Reference-grade
Consumer-grade
B&K HATS 4128C
-80080
-400
50
0
360
ITD
(s)
20Elevation, (deg.)
400
270-10
800
180-40Azimuth, (deg.)90-70 0
Human subject3 Data Processing
MORPHOLOGICAL SCANSImport
head and torso scanswith and without wig cap
Import
pinnae scans
2 .1 Measurement Details
HRTFsMeasurement room Anechoic chamber
Number of directions 648 (72 azimuths × 9 elevations)Loudspeakers 9 × Genelec 8010A
Binaural microphones Theoretica Applied Physics BACCH-BM Pro
Excitation signal
Multiple exponential sine sweeps [1]Duration: 500 ms (200 ms inter-sweep delay)Nominal frequency range: 20 Hz to 48 kHz
Sampling rate: 96 kHz
Data export format SOFA [3]
Morphological ScansHead and torso scanner PrimeSense Carmine 1.09
Pinna scanner Artec Space SpiderScanning software Skanect Pro; Artec Studio 12 ProData export format PLY
Turntable
0.76 m
45o
-57o
Circular arc with loudspeakers
Headrest
Drum-throne seat
Outline ET250-3D turntable
HRTFs
HRTFs
Invert
f (kHz)
�
10�3
0
0.05 0.1 30 32
with regularization [4]
ExportHRIRs, RIRs and BIRs, in SOFA
✻
Convolve
Importreference impulse responses (RIRs)
Importbinaural impulse responses (BIRs)
Window10 ms Tukey
5 Summary
References[1] Majdak, P., Balazs, P., and Laback, B., J. Audio Eng. Soc., 55(7/8), pp. 623–637, 2007. [2] Sridhar, R. and Choueiri, E. Y., in Audio Eng. Soc. Convention 143, 2017. [3] https://www.sofaconventions.org/mediawiki/index.php/Files [4] Farina, A., in Audio Eng. Soc. Convention 122, 2007.
We have begun an on-going project to measure HRTFs and 3D scans of the head and upper torso of humans and mannequins, and compile the data into a freely available database which may be downloaded from: http://www.princeton.edu/3D3A/HRTFMeasurements.html
↣ Merge
Exportconsumer-grade
scan in PLY
Aligny-axis = interaural axis
y
x
z
q
f
interaural
axis
0.5-0.7 m
wig capalignment marker
PrimeSense Carmine 1.09
Artec Space Spider
0.2-0.3 m
Exportreference-grade
scan in PLY
