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This conventions defines free-field HRTFs stored as transfer functions in the spherical-harmonics domain, measured with an omnidirectional source for a single listener.

Based on SimpleFreeFieldHRTF, the only difference is that the HRTFs are in a spatially continuous representation.

The conventions is defined in AES69-2020 (SOFA 2.0).

Name Default Flags Dimensions Type Comment
GLOBAL:Conventions SOFA rm attribute
GLOBAL:Version 2.0 rm attribute
GLOBAL:SOFAConventions FreeFieldHRTF rm attribute This conventions is for HRTFs created under conditions where room information is irrelevant and stored as SH coefficients
GLOBAL:SOFAConventionsVersion 1.0 rm attribute
GLOBAL:APIName rm attribute
GLOBAL:APIVersion rm attribute
GLOBAL:ApplicationName attribute
GLOBAL:ApplicationVersion attribute
GLOBAL:AuthorContact m attribute
GLOBAL:Comment attribute
GLOBAL:DataType TF-E rm attribute
GLOBAL:History attribute
GLOBAL:License No license provided, ask the author for permission m attribute
GLOBAL:ListenerShortName m attribute ID of the subject from the database
GLOBAL:Organization m attribute
GLOBAL:References attribute
GLOBAL:RoomType free field m attribute
GLOBAL:Origin attribute
GLOBAL:DateCreated m attribute
GLOBAL:DateModified m attribute
GLOBAL:Title m attribute
ListenerPosition [0 0 0] m IC, MC double
ListenerPosition:Type cartesian m attribute
ListenerPosition:Units metre m attribute
ReceiverPosition [0 0.09 0; 0 -0.09 0] m RCI, RCM double
ReceiverPosition:Type cartesian m attribute
ReceiverPosition:Units metre m attribute
SourcePosition [0 0 0] m IC, MC double Source position is assumed to be the ListenerPosition in order to reflect Emitters surrounding the Listener
SourcePosition:Type spherical m attribute
SourcePosition:Units degree, degree, metre m attribute
EmitterPosition [0 0 0] m IC, ECI, ECM double Emitter positions are irrelevant because they data is spatially continuous
EmitterPosition:Type harmonics m attribute Spatially continuous representation by means of harmonics
EmitterPosition:Units spherical m attribute 3D representation
GLOBAL:DatabaseName m attribute Name of the database to which these data belong
ListenerUp [0 0 1] m IC, MC double
ListenerView [1 0 0] m IC, MC double
ListenerView:Type cartesian m attribute
ListenerView:Units metre m attribute
Data.Real [0 0] m mrne double
Data.Imag [0 0] m MRNE double
N 0 m N double
N_LongName frequency attribute
N_Units hertz attribute