I know Jan Jacob had noticed a while ago that the older ambisonic
opcodes were off, and I think it's great to have working ones now.
Thanks very much Fons!!!

steven


On Fri, Jul 18, 2008 at 12:33 PM, Fons Adriaensen <fons@kokkinizita.net> wrote:
> On Fri, Jul 18, 2008 at 12:52:20PM -0400, Art Hunkins wrote:
>
>> If there are significantly better and truer ambisonic opcodes to be had, I
>> for one would be happy to redo my recent compositions to take advantage of
>> them. For one thing, Victor's "kludge" of stereo ambisonics (granted, a most
>> effective one) would hopefully no longer be required.
>>
>> Can someone advise as to what sonic improvement results from the revisions?
>
> The new opcodes implement the same decoders as the existing ones:
>
>    layout     orders
> -------------------------
>    stereo     1
>    square     1
>    5.1        1,2
>    octagon    1,2,3
>    cube       1
>
> but this time they are correctly implemented. There were
> several serious errors in the earlier ones, some of them
> making part of the code as good as useless.
>
> All the decoders are single-band (i.e. frequency independent)
> 'in phase' AKA 'controlled opposites' ones. They are not
> optimal (this would require dual band, the option to select
> max rV and max rE, and near-field compensation), but are
> robust in the sense that they will work even if your setup
> is not ideal. They are meant as 'entry level' decoders.
>
> The original encoder opcode had several gain factors wrong,
> and these errors were repeated in the decoders (and they
> would *not* cancel out).
>
> The new version provides nothing new, just a correctly
> working version of basic ambisonics functions that does
> not require the composer to compensate for the errors
> in the opcode (which is probably what has happened a lot
> before).
>
> Ciao,
>
> --
> FA
>
> Laboratorio di Acustica ed Elettroacustica
> Parma, Italia
>
> O tu, che porte, correndo si ?
> E guerra e morte !
>
>
>
>
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