Online tool for the prediction of room acoustical qualities

This application calculates acoustical parameters from room impulse responses, primarily from ISO 3382-1¹, Soulodre & Bradley² and L.L. Beranek³. It is in parts based on an earlier implemented Matlab tool⁴. The accompanying masters thesis goes into detail about calculation methods used in this application⁵.

Both tools were programmed at the Institute of Sound and Vibration Engineering​ (ISAVE), which is part of the Hochschule Düsseldorf.

Using OPRA

OPRA is available at https://opra.isave.hs-duesseldorf.de. All data is kept locally in your browser.

Room impulse response files

Room impulse response files can be obtained through github.com/RoyJames/room-impulse-responses. Some are also stored in this repository in testfiles/.

Contributing

See CONTRIBUTING.md;

Known Issues

Stuttering in Chromium-based browsers on Linux

There seems to be a bug in chromium-based browsers with certain Linux configurations. createIIRFilter() takes around 50ms to complete, while on Firefox, it takes <1ms. This causes the UI to be unresponsive during file analyzing (minimal example). Consider switching to Firefox.

Footnotes

1. ISO 3382-1. (2009). Acoustics – Measurement of roomacoustic parameters – Part1: Performance Spaces ↩

2. Soulodre, G. A., & Bradley, J. S. (1995). Subjective evaluation of new room acoustic measures ↩

3. Beranek, L. L. (1962). Concert Halls and Opera Houses Music, Acoustics, and Architecture ↩

4. Prinz, L. J. (2021). Entwicklung eines Werkzeugs für dieAuswertung von Impulsantworten zur Untersuchung raumakustischer Qualität ↩

5. Schwörer, P. (2023). A web-based toolbox for analyzing acoustic room impulse responses ↩