foundations
the research and the software bambi builds on
the inspiration
Institute of Electronic Music and Acoustics (IEM), Graz — Daniel Rudrich, lead developer
free and open source, GPLv3
The open reference for higher-order ambisonics in a DAW: how a plugin suite for the whole sphere can work, from encoding to visualising a field. bambi was written from the published theory rather than from its code, and would not exist in this form without it.
ambisonics
Jérôme Daniel
doctoral thesis, Université Paris 6, 2000
Higher-order ambisonics, and the max-rE weighting bambi reads and places fields with.
Franz Zotter and Matthias Frank
Springer, 2019, open access
The reference for the spherical harmonics, rotations and decoding under everything bambi does.
Christian Nachbar, Franz Zotter, Etienne Deleflie and Alois Sontacchi
ambiX — A Suggested Ambisonics Format
Ambisonics Symposium, Lexington, 2011
The channel order and normalisation bambi speaks: ACN, SN3D.
echo
Hannes Pomberger and Franz Zotter
Warping of 3D Ambisonic Recordings
Ambisonics Symposium, Lexington, 2011
The warp behind Echo's skew: each pass gathers the field towards one pole of its axis.
reverb
Jont B. Allen and David A. Berkley
Image method for efficiently simulating small-room acoustics
Journal of the Acoustical Society of America 65(4), 1979
The early reflections: a room's walls as mirror images of the source.
Carl F. Eyring
Reverberation time in “dead” rooms
Journal of the Acoustical Society of America 1(2), 1930
How long a room of a given size and absorption rings.
Jean-Marc Jot and Antoine Chaigne
Digital delay networks for designing artificial reverberators
AES 90th Convention, Paris, 1991, preprint 3030
The feedback delay network the tail is built on, and how to give it a decay per band.
Sebastian J. Schlecht and Emanuël A. P. Habets
Feedback Delay Networks: Echo Density and Mixing Time
IEEE/ACM Transactions on Audio, Speech, and Language Processing 25(2), 2017
How dense a delay network’s echoes grow, and when.
Alexander Lindau, Linda Kosanke and Stefan Weinzierl
Journal of the Audio Engineering Society 60(11), 2012
When the reflections stop being heard one by one, and the tail takes over.
Julius O. Smith III
Physical Audio Signal Processing
online book, CCRMA, Stanford
Delay-network reverberation in practice: mode density and tonal correction.
Geraint Luff, Signalsmith Audio
article, 2021
A clear, practical path from diffusion to a working tail.