SimpleHeadphoneIR

Conventions for IRs with a 1-to-1 correspondence between emitter and receiver. The main application for this convention is to store headphone IRs recorded for each emitter and each ear.

Proposed version 0.1

In conventions SimpleHeadphoneIR we store IRs of the system headphone-ear, i.e. headphone IRs. The most important properties of SimpleHeadphoneIR are:

• One-to-one correspondence between emitters and receivers: When measuring headphones, we usually have two headphones (=two emitters, E1 and E2) and we have two mics places in the ears (=two receivers, R1 and R2). In the first measurement we measure E1-->R1,R2; in the second one we measure: E2-->R1, R2. Usually, IRs E1-->R1 and E2-->R2 are the interesting IRs and are further processed. Note the correspondence of the emitter and receiver indices: This one-to-one correspondence of emitters and receivers is a strict property of SimpleHeadphoneIR. (If you also need the crosstalk IRs, i.e., E1-->R2 and E2-->R1, GeneralFIR is recommended).
• Single listener: in a single file, IRs of a single listener are stored. Note that multiple measurements of the same listener can still be stored in a single file. Note the correspondence to SimpleFreeFieldHRIR, in which the HRTFs are also restricted to those of a single listener.
• Multiple measurements (of the single listener): multiple measurements are described as repeated measurements of the same listener. The repetition might have various reasons:
  • No modifications at all, i.e., simple re-measuring the IRs. It that case, the measurement time/date has changed, which will be captured by MeasurementDate for each M.
  • Position of the headphones change: It that case, the measurement time/date and the source/emitter position/orientation have changed, which will be captured by the corresponding variables for each M.
  • The headphones might change, e.g. by measuring IRs of different headphones. In that case, the metadata describing the headphones will be a function of M. At the moment, we consider the following metadata as being potentially a function of M:
    • SourceManufacturer: name of the headphones manufacturer (mandatory)
    • SourceModel: name of the headphone model. Must uniquely describe the headphones of a manufacturer (mandatory).
    • SourceURI: URI to the specs of the headphones (optional).

Previously proposed for HeadphoneIR, version 0.1

This conventions proposal is deprecated - a new proposal is currently under development. Contribute by discussing with us (use the "Discussion" tab).

Name	Default	Flags	Dimensions	Type	Comment
GLOBAL:Conventions	SOFA	rm		attribute
GLOBAL:Version	0.5	rm		attribute
GLOBAL:SOFAConventions	SimpleHeadphoneIR	rm		attribute	Conventions for IRs with a 1-to-1 correspondence between emitter and receiver. The main application for this convention is to store headphone IRs recorded for each emitter and each ear.
GLOBAL:SOFAConventionsVersion	0.1	rm		attribute
GLOBAL:APIName		rm		attribute
GLOBAL:APIVersion		rm		attribute
GLOBAL:ApplicationName		m		attribute
GLOBAL:ApplicationVersion		m		attribute
GLOBAL:AuthorContact		m		attribute
GLOBAL:Comment		m		attribute
GLOBAL:DataType	FIR	rm		attribute	We will store IRs here
GLOBAL:History		m		attribute
GLOBAL:License	No license provided, ask the author for permission	m		attribute
GLOBAL:Organization		m		attribute
GLOBAL:References		m		attribute
GLOBAL:RoomType	free field	m		attribute	Room type is not relevant here
GLOBAL:Source		m		attribute
GLOBAL:TimeCreated		m		attribute
GLOBAL:TimeModified		m		attribute
GLOBAL:Title		m		attribute
ListenerPosition	[0 0 0]	m	IC, MC	double
ListenerPosition:Type	cartesian	m		attribute
ListenerPosition:Units	meter	m		attribute
ReceiverPosition	[0 -0.09 0; 0 0.09 0]	m	rCI, rCM	double
ReceiverPosition:Type	cartesian	m		attribute
ReceiverPosition:Units	meter	m		attribute
SourcePosition	[0 0 0]	m	IC, MC	double	Headphones are located at the position of the listener
SourcePosition:Type	spherical	m		attribute
SourcePosition:Units	degree, degree, meter	m		attribute
EmitterPosition	[0 -0.09 0; 0 0.09 0]	m	eCI, eCM	double	Reflects the correspondence of each emitter to each receiver
EmitterPosition:Type	cartesian	m		attribute
EmitterPosition:Units	meter	m		attribute
GLOBAL:DatabaseName		m		attribute	to which HRTF database these data correspond?
GLOBAL:SubjectID		m		attribute	to which subject from the database these data correspond?
GLOBAL:SourceProducer				attribute	who produced the headphones?
GLOBAL:SourceModel				attribute	how is this headphone called?
GLOBAL:ProcessingState				attribute	how are the IRs processed (raw, equalized, etc)?
GLOBAL:ListenerDescription				attribute	describe the listener here (human, dummy head, etc)
GLOBAL:SourceDescription				attribute	describe the headphones here
GLOBAL:ReceiverDescription				attribute	describe the microphones here
GLOBAL:EmitterDescription				attribute	describe the drivers of the headphones here
Data.IR	[1 1]	m	mRn	double
Data.SamplingRate	48000	m	I	double
Data.SamplingRate:Units	hertz	m		attribute
Data.Delay	[0 0]	m	IR, MR	double