AES 143rd International Convention
e-Brief 356
Microphone Array Impulse Response (MAIR) Library for Spatial Audio Research Hyunkook Lee and Connor Millns
[email protected] Applied Psychoacoustics Lab (APL) University of Huddersfield, UK
MAIR Library and Renderer • An extensive library of room impulse responses captured in a reverberant concert hall using 41 different microphone configurations for 13 source positions. • The MAIR Library and Renderer can be used for – A quick creation of multichannel acoustic recordings for spatial audio experiments. – A virtual mic array recording for DAW outputs. – A spatial ear training for comparing different spatial characteristics.
MAIR Recording Venue • St. Paul’s Concert Hall, Huddersfield, UK. – Average reverb time: 2.1s – Church converted hall. – High ceiling.
Equipment and Method • Microphones: Neumann digital kk series - Cardioid (kk184), Fig-8 (kk120), Omni (kk133), Hypercardioid (kk185)
• Loudspeakers: Genelec 8040A and 1029A.
• Interfaces: Neumann DMI-8 and Merging HAPI.
• Impulse response acquisition – Using the HAART multichannel RIR measurement tool. http://eprints.hud.ac.uk/id/eprint/24579/ – Exponential Sine Sweep method.
Physical Setup • Stage-Audience scenario S10
S2 S3 8m
FL
RL
RL
FL
S4
7m
FC RR
FR
RR FR Main array
Ambience array Main mic Height mic
S8
Genelec 8040A Genelec 1029A
S11
S1
3.9m
S5 S6 S7
S12 S9 S13
Physical Setup • 360° stage scenario Genelec 8040A
3m
Genelec 8040A
3m
360° array
360° array
Ambeo / KU100 ESMA
Height mic
Am
ES
Microphone Techniques • Main Arrays – 2ch: XY130, AB50, ORTF, Dummy head (KU100) – 3ch: Decca Tree, Fukada Tree – 4ch: ESMA25, ESMA50, FOA (Ambeo) – 5ch: 3 configurations of PCMA, ICA, OCTinspired, 2L-inspired – 9 configurations of 4ch height mic square with various heights, polar patterns and directions.
• Ambience Arrays – 15 configurations of 4ch Hamasaki-Square with various heights, polar patterns and directions
• 360° Arrays – FOA, ESMA25, ESMA50 with height mics.
MAIR Renderer • Multichannel convolution and binauralisation – Enables the auralisation of the microphone arrays with dry sound sources, for binaural and up to 9ch loudspeaker playbacks. – Uses multiconvolve object from HISS tool for efficient and fast convolution. http://eprints.hud.ac.uk/id/eprint/14897/ – Allows simultaneous comparisons between the microphone arrays. – Takes DAW output signals and maps them to 13 loudspeaker positions.
Free Download • www.hud.ac.uk/apl • www.github.com/APL-Huddersfield
• Please sign up for future version updates.
