Accessing the BRIRs
The BRIRs in this dataset can be used to create virtual surround sound on headphones through BRIR convolution. This requires IR Convolution software that supports stereo or true stereo processing such as Equalizer APO. Configurations for Equalizer APO are provided for each room in the dataset and for a range of common speaker configurations. The provided Equalizer APO configurations utilise sets of azimuth-specific BRIRs to simulate common speaker configurations. Custom configurations can be built by modifying existing configuration files and selecting BRIRs corresponding to the desired source azimuth angles or positions within a room. Refer to the information below to locate individual BRIRs within the dataset.
The azimuth-specific BRIRs are located in the BRIRs folder and follow the naming convention below.
BRIR_<Room_ID>_<Configuration_ID>_<Elevation>_<Azimuth>.WAV
| Field | Range | Description |
|---|---|---|
| Room_ID | From R01 to R35 | Room ID number sorted by date added to the dataset. Refer to the Room and Measurement Summary page for room names and room IDs. |
| Configuration_ID | From C1 to C6 | The ID number of each measurement configuration within the room. Applicable to rooms that include multiple configurations relating to source positions, receiver positions, listener types, or acoustic absorption. Applicable rooms can be identified in the Room and Measurement Summary page. |
| Elevation | From E-60 to E60 | Elevation angle between source and listener in degrees. Refer to the coordinate system below. Applicable to rooms that include multiple elevation angles. Applicable rooms can be identified in the Room and Measurement Summary page. |
| Azimuth | From A-179 to A180 | Azimuth angle between the source and listener in degrees. Refer to the coordinate system below. |
The azimuth angles between the source and the listener’s head follow the coordinate system shown in the diagram below. An azimuth of -90 corresponds to a point directly to the left of the listener while an azimuth of 90 corresponds to a point directly to the right of the listener.
Positive elevation angles correspond to points above the listener while negative angles correspond to points below the listener. An elevation of 0 corresponds to a point at the same level as the listener.
The azimuth-specific BRIRs are provided as 2 channel WAV files with a sampling rate of 44100Hz and a bit depth of 24 bits per sample.
A set of true stereo BRIRs are also provided for each room and source/receiver configuration. The true stereo BRIRs are 4 channel (LL LR RL RR) WAV files with a sampling rate of 44100Hz and a bit depth of 24 bits per sample. The -30 and +30 degree azimuth BRIRs were used to generate the set of true stereo BRIRs. These are located in the BRIRs folder and follow the naming convention below.
BRIR_<Room_ID>_<Configuration_ID>_True_Stereo.WAV
The HeSuVi_BRIRs folder contains a set of BRIRs in the format HeSuVi can read. Refer to the Equalizer APO Configuration page for usage steps.
The BRIRs in the HeSuVi_BRIRs\hrir folder are provided as 14 channel WAV files with a sampling rate of 48000Hz and a bit depth of 24 bits per sample.
The BRIRs in the HeSuVi_BRIRs\hrir\44 folder are provided as 14 channel WAV files with a sampling rate of 44100Hz and a bit depth of 24 bits per sample.
The channel mapping for the 2 channel azimuth-specific BRIRs is as follows:
- X degree azimuth source - L ear
- X degree azimuth source - R ear
The channel mapping for the 4 channel true stereo BRIRs is as follows:
- -30 degree azimuth source - L ear
- -30 degree azimuth source - R ear
- +30 degree azimuth source - L ear
- +30 degree azimuth source - R ear
The channel mapping for the 14 channel HeSuVi BRIRs is as follows:
- -30 degree azimuth source - L ear
- -30 degree azimuth source - R ear
- -90 degree azimuth source - L ear
- -90 degree azimuth source - R ear
- -135 degree azimuth source - L ear
- -135 degree azimuth source - R ear
- 0 degree azimuth source - L ear
- +30 degree azimuth source - R ear
- +30 degree azimuth source - L ear
- +90 degree azimuth source - R ear
- +90 degree azimuth source - L ear
- +135 degree azimuth source - R ear
- +135 degree azimuth source - L ear
- 0 degree azimuth source - R ear