Room acoustic measurement and simulation data of the St. Nicholas Chapel, Aachen Cathedral

This dataset accompanies a study of the room acoustics of the St. Nicholas Chapel
(Nikolauskapelle), a late-Gothic, acoustically coupled two-storey hall chapel of
Aachen Cathedral (volume ≈ 3050 m³, mid-frequency reverberation time ≈ 4.6 s). It
provides the primary measurement data, derived results, and analysis code
underlying the associated journal article (Zerwas & Kayku, Acta Acustica).

Contents:
• Measured room impulse responses — 46 four-channel B-format (FuMa) impulse
  responses at 48 kHz, recorded with a Sennheiser Ambeo / IRIS 3D system using
  exponential sine-sweep excitation, for three source positions (main room, side
  aisle, gallery) and up to 22 receiver positions per source, following ISO 3382-1.
• Derived room-acoustic parameters — 19 ISO 3382-1 parameters (EDT, T20, T30, C80,
  C50, D50, Ts, G, lateral fractions, etc.) per receiver in 29 one-third-octave
  bands, plus speech-intelligibility quantities.
• Background-noise measurement — one-third-octave quiet-state spectrum (NTi XL3) at
  the central main-room position.
• Pink-noise reverberation-time cross-check (NTi XL3) at selected positions.
• Multi-exponential (multi-rate) decay-analysis results (DecayFitNet: T1, T2, A1, A2).
• Simulation outputs — impulse responses and parameter exports from a
  geometrical-acoustics model (ODEON) and a hybrid wave-based/geometrical model
  (TREBLE), together with the material/absorption data used for calibration.
• Analysis code (Python) used to process the measurements and reproduce the
  published results.

Not included: the 3D geometry is derived from a third-party laser scan of Aachen
Cathedral and is not redistributed here (available from the laser-scan authors
under their data-sharing agreement); the European church reverberation-time
comparison data are third-party (Peutz Consult GmbH, personal communication) and
are not part of this deposit.

The measurement and result data are released under CC-BY 4.0; the accompanying code
under the MIT License. Please cite the associated article and this dataset.