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This conventions defines free-field HRTFs stored as second-order sections, measured with an omnidirectional source for a single listener.

Based on SimpleFreeFieldHRIR, the only difference is the DataType, that is SOS.

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

Name Default Flags Dimensions Type Comment
GLOBAL:Conventions SOFA rm attribute
GLOBAL:Version 1.0 rm attribute
GLOBAL:SOFAConventions SimpleFreeFieldHRSOS rm attribute This convention set follows SimpleFreeFieldHRIR but the data is stored as second-order section (SOS) coefficients.
GLOBAL:SOFAConventionsVersion 2.0 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 SOS rm attribute Filters described as second-order section (SOS) coefficients
GLOBAL:History attribute
GLOBAL:License No license provided, ask the author for permission m attribute
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 1] m IC, MC double Source position is assumed to vary for different directions/positions around the listener
SourcePosition:Type spherical m attribute
SourcePosition:Units degree, degree, metre m attribute
EmitterPosition [0 0 0] m eCI, eCM double
EmitterPosition:Type cartesian m attribute
EmitterPosition:Units metre m attribute
GLOBAL:DatabaseName m attribute name of the database to which these data belong
GLOBAL:ListenerShortName m attribute ID of the subject from the database
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.SOS permute([0 0 0 1 0 0; 0 0 0 1 0 0], [3 1 2]); m mRn double Filter coefficients as SOS coefficients.
Data.SamplingRate 48000 m I double Sampling rate of the coefficients in Data.SOS and the delay in Data.Delay
Data.SamplingRate:Units hertz m attribute
Data.Delay [0 0] m IR, MR double Broadband delay (in samples resulting from SamplingRate)