Re: [Sursound] Conversion from FOA to TOA ? How to and why or not?

[Trond Lossius]

Hi,

>> What is the simplest or best way to upscale FOA to TOA.
> 
> Harpex-based upsamplers yield good results.
> 
> Horizontal-only, you can use the Harpex-B plug-in. Full sphere, the Blue 
> Ripple Sound Harpex Upsampler.
> 
> http://harpex.net
> 
> http://www.blueripplesound.com/products/toa-harpex-upsampler-vst

I use the Blue Ripple Harpex upsampler extensively in my installations, in fact 
it was me that asked Richard Furse if he could license the Harpex library and 
create this plugin. The benefit is that when I do installations with 16 or more 
speakers, distributed as two rings near the floor and high up at the wall, and 
use the Rspture 3D Advanced decoder, I tend to get much more stable sound field 
reproduction with more precise definition and localisation of sources within 
B-format field recordings in the space than a FOA would give on its own.

I got to try this briefly at BEAST FEAST in April in the venue used for 
presentations with 24 speakers as I demoed the ATK for Reaper plugins. That was 
probably the best setup that I have been able to get my hands on to date.

Cheers,
Trond
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Re: [Sursound] Ambisonics on the web pt.1: Web Audio FOA/HOA ambisonic objects

[Politis Archontis]

Hi, 

just a note that I replaced the binaural decoding filters in the examples with 
others that fix most of the decoding colouration issues that were very strong 
in the first version. 
I‘ve also added some Matlab routines that can show how these filters can be 
computes from an HRTF set, with two different approaches, a virtual decoding 
and a “direct” approach.

I’d like to get some feedback (does it sound better?) from people that are 
interested in this. (You can find and listen to the examples at the bottom of 
the webpage https://github.com/polarch/JSAmbisonics).

The library will soon be packaged as a more formal javascript library, with 
NodeJS - thanks to David Poirier-Quinot from IRCAM for the massive work!

Best regards,
Archontis

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