FreeFieldHRIR

The convention is an extension of SimpleFreeFieldHRIR in order to consider more complex data sets described in spatially continuous representation. Each HRTF direction corresponds to an emitter (instead of a source position), and a consistent measurement for a single listener and all directions is described by a set of the emitter positions (instead of source positions) surrounding the listener.

The data type 'FIR-E' is used (instead of 'FIR' as in SimpleFreeFieldHRIR).

The conventions is defined in AES69-2022 (SOFA 2.1).

Name	Default	Flags	Dimensions	Type	Comment
GLOBAL:Conventions	SOFA	rm		attribute
GLOBAL:Version	2.1	rm		attribute
GLOBAL:SOFAConventions	FreeFieldHRIR	rm		attribute	An extension of SimpleFreeFieldHRIR in order to consider more complex data sets described in spatially continuous representation. Each HRTF direction corresponds to an emitter, and a consistent measurement for a single listener and all directions is described by a set of the emitter positions surrounding the listener.
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	FIR-E	rm		attribute
GLOBAL:History				attribute
GLOBAL:License	No license provided, ask the author for permission	m		attribute
GLOBAL:ListenerShortName		m		attribute	Short name of the listener (as for example the subject ID).
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	Radius in 'spherical harmonics', Position in 'cartesian' and 'spherical'
EmitterPosition:Type	spherical harmonics	m		attribute	Can be 'spherical harmonics', 'cartesian', or 'spherical'
EmitterPosition:Units	degree, degree, metre	m		attribute
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.IR	[0 0]	m	mrne	double
Data.SamplingRate	48000	m	I, M	double
Data.SamplingRate:Units	hertz	m		attribute
Data.Delay	[0 0]	m	IRI, MRI, MRE	double	Additional delay of each IR (in samples)