Ambisonic Decoding with Panning-Invariant Loudness on Small Layouts (AllRAD2)

Zotter F, Frank M. Ambisonic Decoding with Panning-Invariant Loudness on Small Layouts (AllRAD2). In: AES Convention 144. Audio Engineering Society; 2018. Paper 9943. Available from: https://aes.org/publications/elibrary-page/?id=19460

@inproceedings{Zotter2018_19460,
  author = {Zotter, Franz and Frank, Matthias},
  title = {{Ambisonic Decoding with Panning-Invariant Loudness on Small Layouts (AllRAD2)}},
  booktitle = {AES Convention 144},
  note = {Paper 9943},
  year = {2018},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=19460}
}

TY  - CPAPER
TI  - Ambisonic Decoding with Panning-Invariant Loudness on Small Layouts (AllRAD2)
AU  - Zotter, Franz
AU  - Frank, Matthias
T2  - AES Convention 144
M1  - Paper 9943
PY  - 2018
DA  - 2018/05/06
UR  - https://aes.org/publications/elibrary-page/?id=19460
PB  - Audio Engineering Society
LA  - en
AB  - On ITU BS.2051 surround with height loudspeaker layouts, Ambisonic panning is practice-proof, when using AllRAD decoders involving imaginary loudspeaker insertion and downmix. And yet on the 4+5+0 layout, this still yields a loudness difference of nearly 3 dB when comparing sounds panned to the front with such panned to the back. AllRAD linearly superimposes a series of two panning functions, optimally sampled Ambisonics and VBAP. Both are perfectly energy-preserving and therefore do not cause the loudness differences themselves, but their linear superposition does. In this contribution we present and analyze a new AllRAD2 approach that achieves decoding of constant loudness by (i) superimposing the squares of both panning functions, and (ii) calculating the equivalent linear decoder of the square root thereof.
ER  -