Re: Some Ambisonics questions

> Hi -
>
> I've never used Ambisonics before, but I'm wondering about how
> possible it would be to implement the following setup using SC's
> Ambisonics stuff:
>
> I have 20 or 30 point sources, each of which has a location in the x-y
> plane (and may move about in this plane). I'd like to encode them into
> an Ambisonic representation, then decode this to a ring-of-8-speakers.
> Then for convenience I'd also like to be able to project this
> ring-of-8 down to stereo headphones using a HRTF.
>
> Looking back over the mailing list archives it looks like this is
> probably possible - looks like I could use BFEncode2 to encode the
> sources, then BFDecode1 to decode onto the speaker ring. But I have
> some questions:
>
> * How do I turn many point sources into one single B-format feed? Do I
> encode each one separately and then just add the feeds together? (Or
> multiply the feeds together? Or...)
>
> * In terms of the audio outcome, is the only difference between the
> different "orders" of Ambisonics the sound quality?
>
> * For projecting the ring down to headphones, what is needed? In the
> archive there's discussion of downloading the Kemar HRTFs from MIT -
> fine. But is there a specific UGen that would take my 8 channels and
> apply the HRTFs? Or otherwise how would it work?
>
> I'd be grateful for any tips
> Dan
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