# Recorded impulse responses

The eleven files in this folder are derived from the OpenAIR library (Open Acoustic Impulse Response Library,
www.openairlib.net), hosted by the Audiolab, University of York. Each is licensed under
[Creative Commons Attribution 4.0 International](https://creativecommons.org/licenses/by/4.0/) (CC BY 4.0).

| File | Space | Attribution | Original recording | OpenAIR page |
|---|---|---|---|---|
| `stone-tower.flac` | Tyndall Bruce Monument, Falkland, Scotland | www.openairlib.net, Audiolab, University of York, Dr. Damian T. Murphy | `tyndall_bruce_ortf.wav` | https://www.openair.hosted.york.ac.uk/?page_id=764 |
| `stone-hall.flac` | St Andrew's Church, Lyddington, England | www.openairlib.net, Audiolab, University of York, Damian T. Murphy | `lyd3_000_ortf_48k.wav` | https://www.openair.hosted.york.ac.uk/?page_id=683 |
| `domed-chamber.flac` | Hamilton Mausoleum, Hamilton, Scotland | www.openairlib.net, Audiolab, University of York, Damian T. Murphy | `hm2_000_ortf_48k.wav` | https://www.openair.hosted.york.ac.uk/?page_id=502 |
| `vast-nave.flac` | York Minster, York, England | www.openairlib.net, Audiolab, University of York, Damian T. Murphy | `minster1_000_ortf_48k.wav` | https://www.openair.hosted.york.ac.uk/?page_id=797 |
| `stone-tunnel.flac` | Innocent Railway Tunnel, Edinburgh, Scotland | www.openairlib.net | `middle_tunnel_1way_bformat.wav` | https://www.openair.hosted.york.ac.uk/?page_id=525 |
| `stone-chapel.flac` | Lady Chapel, St Albans Cathedral, England | www.openairlib.net, Audiolab, University of York, Marcin Gorzel, Gavin Kearney, Aglaia Foteinou, Sorrel Hoare, Simon Shelley | `stalbans_a_ortf.wav` | https://www.openair.hosted.york.ac.uk/?page_id=595 |
| `marble-hall.flac` | Marble Hall, Elveden Hall, Suffolk, England | Matt Rogalsky | `1a_marble_hall.wav` | https://www.openair.hosted.york.ac.uk/?page_id=459 |
| `empty-warehouse.flac` | Terry's Factory Warehouse, York, England | www.openairlib.net, Audiolab, University of York, Dr. Damian T. Murphy | `terrys_warehouse_stereo.wav` | https://www.openair.hosted.york.ac.uk/?page_id=735 |
| `stone-chamber.flac` | Maes Howe, Orkney, Scotland | www.openairlib.net, Audiolab, University of York, Damian T. Murphy | `mh3_000_ortf_48k.wav` | https://www.openair.hosted.york.ac.uk/?page_id=602 |
| `concert-hall.flac` | Usina del Arte Symphony Hall, Buenos Aires, Argentina | www.untref.edu.ar | `usina_main_s1_p3.wav` | https://www.openair.hosted.york.ac.uk/?page_id=770 |
| `rock-hall.flac` | R1 Nuclear Reactor Hall, Stockholm, Sweden | www.openairlib.net, Audiolab, University of York, Dr. Damian T. Murphy | `r1_ortf-48k.wav` | https://www.openair.hosted.york.ac.uk/?page_id=626 |

The OpenAIR site was offline when these were fetched (November 2026). The pages above are available through the
Internet Archive, and the original archives were downloaded from
`https://webfiles.york.ac.uk/OPENAIR/IRs/<space>/<space>.zip`.

## Changes made

Each recording was resampled to 48 kHz where needed, trimmed to start at the direct sound, had the direct sound
itself removed (the first 1.5 ms silenced, rising to full level by 4 ms) so the tool can keep the original voice
separate from the room, was cut where the decay reaches the recording's noise floor with a fade over the final
part, peak-normalised, and saved as 24-bit FLAC.

Three files had further changes. `stone-tunnel.flac` was decoded from the four-channel B-format recording to a
left/right pair (W plus and minus 0.7 times Y). `empty-warehouse.flac` was shortened to 14 seconds and
`rock-hall.flac` to 8 seconds.