Re: [linux-audio-dev] High-order Ambisonic coder/decoder in JACK/LDASPA?

From: Asbjørn Sæbø <asbjs@email-addr-hidden>
Date: Fri Dec 16 2005 - 11:06:35 EET

On Thu, Dec 15, 2005 at 08:33:34PM +0100, fons adriaensen wrote:
> On Thu, Dec 15, 2005 at 04:56:04PM +0100, Asbjørn Sæbø wrote:
>
> > Some colleauges of mine do need a tool for coding and decoding of
> > high-order Ambisonic for their research. They are aiming for seventh
> > order, played back over sixteen loudspeakers. [...]
> > The first thing I would like to
> > know is: Does anything like this already exist?
>
> No, and for some very good reasons.

Then we won't be reinventing the wheel, at least, which is good to know.

> Regardless of the JACK / LADSPA question, seventh order Ambisonics using
> 16 speakers is just ridiculous. Either it's horizontal only, and in that
> case using 7th order is just a waste of resources and effort (3th order
> will do all you want), or it's 3-D, and it that case 7th order requires
> *much* more than 16 speakers.

Well, I don't know much about Ambisonics, so I won't take this
discussion much further. But I note that my colleauge working on this
is very much in disagreement with you. According to him, you
theoretically need order 36 to achieve perfect wave front reconstruction
in a sphere the size of a listeners head. (For a listener in the
sweet spot and for frequencies up to about 22kHz, that is.)

Asbjørn
Received on Fri Dec 16 12:15:23 2005

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