[Csnd] ambisonics encoding equations

[Marlon]

Dear list,

after having a look at the ambisonics UDOs (05B in the FLOSS manual examples) I am trying to find/integrate ambisonics encoding equations higher than 8th order. The according ICMC 2014 paper [1] references a website [2] for encoding equations, which seems to be down, and also here [3] equations don’t go beyond 5th order. Any help/pointers would be greatly appreciated.

Btw, the paper (published 2014) also mentions future enhancements, e.g. encoding of orders > 8, conversion between semi-normalized and normalized spherical harmonics, conversion between different coordinate systems, near field compensation. Have there been any more developments in that regard?

Thanks and cheers,

Marlon

[1] http://smc.afim-asso.org/smc-icmc-2014/papers/images/VOL_1/0804.pdf

[2] http://www.ambisonics.ch which is down, and also 

[3] http://pcfarina.eng.unipr.it/Aurora/HOA_explicit_formulas.htm

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[joachim-3]

hi -

i am already afraid of more than third order ambisonics, so no idea
about what you are asking.  but it looks like icst changed their URLs;
perhaps this helps a tiny bit:
        https://www.zhdk.ch/en/researchproject/icst-ambisonics-plugins-555245

best -
        joachim



On 20/11/2020 21:14, Marlon Schumacher wrote:

> Dear list,
>
> after having a look at the ambisonics UDOs (05B in the FLOSS manual
> examples) I am trying to find/integrate ambisonics encoding equations
> higher than 8th order. The according ICMC 2014 paper [1] references a
> website [2] for encoding equations, which seems to be down, and also
> here [3] equations don’t go beyond 5th order. Any help/pointers would be
> greatly appreciated.
>
> Btw, the paper (published 2014) also mentions future enhancements, e.g.
> encoding of orders > 8, conversion between semi-normalized
> and normalized spherical harmonics, conversion between different
> coordinate systems, near field compensation. Have there been any more
> developments in that regard?
>
> Thanks and cheers,
> Marlon
>
>
> [1] http://smc.afim-asso.org/smc-icmc-2014/papers/images/VOL_1/0804.pdf
> [2] http://www.ambisonics.ch which is down, and also
> [3] http://pcfarina.eng.unipr.it/Aurora/HOA_explicit_formulas.htm
> Csound mailing list [hidden email]
> <mailto:[hidden email]>
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
> https://github.com/csound/csound/issues Discussions of bugs and features
> can be posted here

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[gsenna]

Hi,

Just curious, is this for binaural decoding or do you really have that many speakers to play with?

Conversion between SN3D and N3D I think is trivial: https://github.com/polarch/JSAmbisonics/blob/master/src/ambi-converters.js

Conversion from polar or spherical to cartesian too: https://en.wikipedia.org/wiki/Spherical_coordinate_system#Cartesian_coordinates

Near field compensation goes in the decoder and was implemented in bformdec2, but that one works up to the 5th order and with fixed loudspeakers layouts.

Cheers.

On 20/11/20 18:41, joachim heintz wrote:

hi -

i am already afraid of more than third order ambisonics, so no idea about what you are asking.  but it looks like icst changed their URLs; perhaps this helps a tiny bit:
    https://www.zhdk.ch/en/researchproject/icst-ambisonics-plugins-555245

best -
    joachim



On 20/11/2020 21:14, Marlon Schumacher wrote:

Dear list,

after having a look at the ambisonics UDOs (05B in the FLOSS manual examples) I am trying to find/integrate ambisonics encoding equations higher than 8th order. The according ICMC 2014 paper [1] references a website [2] for encoding equations, which seems to be down, and also here [3] equations don’t go beyond 5th order. Any help/pointers would be greatly appreciated.

Btw, the paper (published 2014) also mentions future enhancements, e.g. encoding of orders > 8, conversion between semi-normalized and normalized spherical harmonics, conversion between different coordinate systems, near field compensation. Have there been any more developments in that regard?

Thanks and cheers,
Marlon


[1] http://smc.afim-asso.org/smc-icmc-2014/papers/images/VOL_1/0804.pdf
[2] http://www.ambisonics.ch which is down, and also
[3] http://pcfarina.eng.unipr.it/Aurora/HOA_explicit_formulas.htm
Csound mailing list [hidden email] [hidden email] https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

Csound mailing list
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https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
       https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here

Csound mailing list [hidden email] https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here