[LAU] Concert with low delay realtime linux audio spatial processing

Giso Grimm gg3137 at vegri.net
Thu Sep 22 07:37:42 UTC 2011

On 09/22/2011 09:17 AM, Philipp Überbacher wrote:
> Excerpts from Giso Grimm's message of 2011-09-21 21:17:42 +0200:
>> [...] a concert with low delay Ambisonics processing
>> of acoustic instruments, the signal processing using linux audio (many
>> components are written by Fons (ambdec, jconvolver) or based on code
>> from Fons and Jörn (panning methods)):
>> Harmony of the Spheres
>> Cosmology and Number Aesthetics in 16th and 20th century Music for Viola
>> da Gamba
>> [...]
> This sounds intriguing, but even if I'd start to hike today I wouldn't
> make it in time. I'm a bit confused by the 'third order' as well, afaik
> only first order and soundfield microphones exist.

We have five single channel signals (the instruments directly picked up
with close microphones), which we feed into a 3rd order horizontal
Ambisonics panner. To some extend we can code distance expression by
adding reverberant bits on a virtual stereo source coming from the same
direction as the source (dry/wet ratio and stereo width is distance
depending). All parameters can dynamically change; trajectories of the
virtual sources are designed to match the music.

- Giso

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