FreeFieldHRTF
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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 AES69-2022 (SOFA 2.1).
| Name | Default | Flags | Dimensions | Type | Comment |
|---|---|---|---|---|---|
| GLOBAL:Conventions | SOFA | rm | attribute | ||
| GLOBAL:Version | 2.1 | 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 | 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.Real | [0 0] | m | mrne | double | |
| Data.Imag | [0 0] | m | MRNE | double | |
| N | 0 | m | N | double | |
| N:LongName | frequency | m | attribute | narrative name of N | |
| N:Units | hertz | m | attribute |