SimpleFreeFieldHRSOS: Difference between revisions

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


== Version 1.2 ==
The conventions is defined in AES69-2022 (SOFA 2.1).
SimpleFreeFieldHRSOS version 1.2 will represent the standardized convention set from AES69-2025.


As compared to version 1.1, version 1.2 defines the optional metadata Normalization.

{| border="1"
!Name
!Default
![[SOFA_conventions#AnchorFlags|Flags]]
![[SOFA_conventions#AnchorDimensions|Dimensions]]
!Type
!Comment
|-
|GLOBAL:Conventions||<nowiki>SOFA</nowiki>||rm||||attribute||
|-
|GLOBAL:Version||<nowiki>2.1</nowiki>||rm||||attribute||
|-
|GLOBAL:SOFAConventions||<nowiki>SimpleFreeFieldHRSOS</nowiki>||rm||||attribute||This convention set follows SimpleFreeFieldHRIR but the data is stored as second-order section (SOS) coefficients.
|-
|GLOBAL:SOFAConventionsVersion||<nowiki>1.2</nowiki>||rm||||attribute||
|-
|GLOBAL:APIName||<nowiki></nowiki>||rm||||attribute||
|-
|GLOBAL:APIVersion||<nowiki></nowiki>||rm||||attribute||
|-
|GLOBAL:ApplicationName||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:ApplicationVersion||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:AuthorContact||<nowiki></nowiki>||m||||attribute||
|-
|GLOBAL:Comment||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:DataType||<nowiki>SOS</nowiki>||rm||||attribute||Filters described as second-order section (SOS) coefficients
|-
|GLOBAL:History||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:License||<nowiki>No license provided, ask the author for permission</nowiki>||m||||attribute||
|-
|GLOBAL:Organization||<nowiki></nowiki>||m||||attribute||
|-
|GLOBAL:References||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:RoomType||<nowiki>free field</nowiki>||m||||attribute||
|-
|GLOBAL:Origin||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:DateCreated||<nowiki></nowiki>||m||||attribute||
|-
|GLOBAL:DateModified||<nowiki></nowiki>||m||||attribute||
|-
|GLOBAL:Title||<nowiki></nowiki>||m||||attribute||
|-
|ListenerPosition||<nowiki>[0 0 0] </nowiki>||m||IC, MC||double||
|-
|ListenerPosition:Type||<nowiki>cartesian</nowiki>||m||||attribute||
|-
|ListenerPosition:Units||<nowiki>metre</nowiki>||m||||attribute||
|-
|ReceiverPosition||<nowiki>[0 0.09 0; 0 -0.09 0]</nowiki>||m||RCI, RCM||double||
|-
|ReceiverPosition:Type||<nowiki>cartesian</nowiki>||m||||attribute||
|-
|ReceiverPosition:Units||<nowiki>metre</nowiki>||m||||attribute||
|-
|SourcePosition||<nowiki>[0 0 1]</nowiki>||m||IC, MC||double||Source position is assumed to vary for different directions/positions around the listener
|-
|SourcePosition:Type||<nowiki>spherical</nowiki>||m||||attribute||
|-
|SourcePosition:Units||<nowiki>degree, degree, metre</nowiki>||m||||attribute||
|-
|EmitterPosition||<nowiki>[0 0 0]</nowiki>||m||eCI, eCM||double||
|-
|EmitterPosition:Type||<nowiki>cartesian</nowiki>||m||||attribute||
|-
|EmitterPosition:Units||<nowiki>metre</nowiki>||m||||attribute||
|-
|GLOBAL:DatabaseName||<nowiki></nowiki>||m||||attribute||Unique name of the database to which these data belong.
|-
|GLOBAL:ListenerShortName||<nowiki></nowiki>||m||||attribute||ID of the subject from the database.
|-
|ListenerUp||<nowiki>[0 0 1]</nowiki>||m||IC, MC||double||
|-
|ListenerView||<nowiki>[1 0 0]</nowiki>||m||IC, MC||double||
|-
|ListenerView:Type||<nowiki>cartesian</nowiki>||m||||attribute||
|-
|ListenerView:Units||<nowiki>metre</nowiki>||m||||attribute||
|-
|Data.SOS||<nowiki>permute([0 0 0 1 0 0; 0 0 0 1 0 0], [3 1 2]);</nowiki>||m||mrn||double||Filter coefficients as SOS coefficients.
|-
|Data.SamplingRate||<nowiki>48000</nowiki>||m||I, M||double||Sampling rate of the coefficients in Data.SOS and the delay in Data.Delay.
|-
|Data.SamplingRate:Units||<nowiki>hertz</nowiki>||m||||attribute||Unit of the sampling rate.
|-
|Data.Delay||<nowiki>[0 0]</nowiki>||m||IR, MR||double||Additional broadband delay (in samples, with the time interval as described by SamplingRate).
|-
|Normalization||<nowiki>0</nowiki>||||I||double||Describing normalization status.
|-
|Normalization:Description||<nowiki></nowiki>||||||attribute||Narrative explanation of the normalization.
|-
|Normalization:References||<nowiki></nowiki>||||||attribute||References to publications describing the normalization.
|-
|Normalization:URI||<nowiki></nowiki>||||||attribute||URIs or DOIs to publications describing the normalization.
|}

== Version 1.1 ==
SimpleFreeFieldHRSOS version 1.1 represents a development stage towards standardized convention set from AES69-2025.

As compared to version 1.0, version 1.1 updates the datatype such that the size of dimension R is defined by the corresponding size of Data.IR.

{| border="1"
!Name
!Default
![[SOFA_conventions#AnchorFlags|Flags]]
![[SOFA_conventions#AnchorDimensions|Dimensions]]
!Type
!Comment
|-
|GLOBAL:Conventions||<nowiki>SOFA</nowiki>||rm||||attribute||
|-
|GLOBAL:Version||<nowiki>2.1</nowiki>||rm||||attribute||
|-
|GLOBAL:SOFAConventions||<nowiki>SimpleFreeFieldHRSOS</nowiki>||rm||||attribute||This convention set follows SimpleFreeFieldHRIR but the data is stored as second-order section (SOS) coefficients.
|-
|GLOBAL:SOFAConventionsVersion||<nowiki>1.1</nowiki>||rm||||attribute||
|-
|GLOBAL:APIName||<nowiki></nowiki>||rm||||attribute||
|-
|GLOBAL:APIVersion||<nowiki></nowiki>||rm||||attribute||
|-
|GLOBAL:ApplicationName||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:ApplicationVersion||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:AuthorContact||<nowiki></nowiki>||m||||attribute||
|-
|GLOBAL:Comment||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:DataType||<nowiki>SOS</nowiki>||rm||||attribute||Filters described as second-order section (SOS) coefficients
|-
|GLOBAL:History||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:License||<nowiki>No license provided, ask the author for permission</nowiki>||m||||attribute||
|-
|GLOBAL:Organization||<nowiki></nowiki>||m||||attribute||
|-
|GLOBAL:References||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:RoomType||<nowiki>free field</nowiki>||m||||attribute||
|-
|GLOBAL:Origin||<nowiki></nowiki>||||||attribute||
|-
|GLOBAL:DateCreated||<nowiki></nowiki>||m||||attribute||
|-
|GLOBAL:DateModified||<nowiki></nowiki>||m||||attribute||
|-
|GLOBAL:Title||<nowiki></nowiki>||m||||attribute||
|-
|ListenerPosition||<nowiki>[0 0 0] </nowiki>||m||IC, MC||double||
|-
|ListenerPosition:Type||<nowiki>cartesian</nowiki>||m||||attribute||
|-
|ListenerPosition:Units||<nowiki>metre</nowiki>||m||||attribute||
|-
|ReceiverPosition||<nowiki>[0 0.09 0; 0 -0.09 0]</nowiki>||m||RCI, RCM||double||
|-
|ReceiverPosition:Type||<nowiki>cartesian</nowiki>||m||||attribute||
|-
|ReceiverPosition:Units||<nowiki>metre</nowiki>||m||||attribute||
|-
|SourcePosition||<nowiki>[0 0 1]</nowiki>||m||IC, MC||double||Source position is assumed to vary for different directions/positions around the listener
|-
|SourcePosition:Type||<nowiki>spherical</nowiki>||m||||attribute||
|-
|SourcePosition:Units||<nowiki>degree, degree, metre</nowiki>||m||||attribute||
|-
|EmitterPosition||<nowiki>[0 0 0]</nowiki>||m||eCI, eCM||double||
|-
|EmitterPosition:Type||<nowiki>cartesian</nowiki>||m||||attribute||
|-
|EmitterPosition:Units||<nowiki>metre</nowiki>||m||||attribute||
|-
|GLOBAL:DatabaseName||<nowiki></nowiki>||m||||attribute||Unique name of the database to which these data belong.
|-
|GLOBAL:ListenerShortName||<nowiki></nowiki>||m||||attribute||ID of the subject from the database.
|-
|ListenerUp||<nowiki>[0 0 1]</nowiki>||m||IC, MC||double||
|-
|ListenerView||<nowiki>[1 0 0]</nowiki>||m||IC, MC||double||
|-
|ListenerView:Type||<nowiki>cartesian</nowiki>||m||||attribute||
|-
|ListenerView:Units||<nowiki>metre</nowiki>||m||||attribute||
|-
|Data.SOS||<nowiki>permute([0 0 0 1 0 0; 0 0 0 1 0 0], [3 1 2]);</nowiki>||m||mrn||double||Filter coefficients as SOS coefficients.
|-
|Data.SamplingRate||<nowiki>48000</nowiki>||m||I, M||double||Sampling rate of the coefficients in Data.SOS and the delay in Data.Delay.
|-
|Data.SamplingRate:Units||<nowiki>hertz</nowiki>||m||||attribute||Unit of the sampling rate.
|-
|Data.Delay||<nowiki>[0 0]</nowiki>||m||IR, MR||double||Additional broadband delay (in samples, with the time interval as described by SamplingRate).
|}

== Version 1.0 ==
The conventions version is defined in AES69-2022 (SOFA 2.1).


{| border="1"
{| border="1"

Revision as of 13:46, 24 September 2025

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.

Version 1.2

SimpleFreeFieldHRSOS version 1.2 will represent the standardized convention set from AES69-2025.

As compared to version 1.1, version 1.2 defines the optional metadata Normalization.

Name Default Flags Dimensions Type Comment
GLOBAL:Conventions SOFA rm attribute
GLOBAL:Version 2.1 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 1.2 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 Unique 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, M double Sampling rate of the coefficients in Data.SOS and the delay in Data.Delay.
Data.SamplingRate:Units hertz m attribute Unit of the sampling rate.
Data.Delay [0 0] m IR, MR double Additional broadband delay (in samples, with the time interval as described by SamplingRate).
Normalization 0 I double Describing normalization status.
Normalization:Description attribute Narrative explanation of the normalization.
Normalization:References attribute References to publications describing the normalization.
Normalization:URI attribute URIs or DOIs to publications describing the normalization.

Version 1.1

SimpleFreeFieldHRSOS version 1.1 represents a development stage towards standardized convention set from AES69-2025.

As compared to version 1.0, version 1.1 updates the datatype such that the size of dimension R is defined by the corresponding size of Data.IR.

Name Default Flags Dimensions Type Comment
GLOBAL:Conventions SOFA rm attribute
GLOBAL:Version 2.1 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 1.1 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 Unique 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, M double Sampling rate of the coefficients in Data.SOS and the delay in Data.Delay.
Data.SamplingRate:Units hertz m attribute Unit of the sampling rate.
Data.Delay [0 0] m IR, MR double Additional broadband delay (in samples, with the time interval as described by SamplingRate).

Version 1.0

The conventions version 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 SimpleFreeFieldHRSOS rm attribute This convention set follows SimpleFreeFieldHRIR but the data is stored as second-order section (SOS) 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 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, M 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)
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