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.
In SimpleHeadphoneIR, the various measurements correspond to repeated measurements of the same listener. The repetition can be done under various modifications:
- 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.
Proposed 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 | HeadphoneIR | 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 |