Thanks for the info, Fons. I'll look forward to substituting the new code 
for the old when it appears in the next Windows installer.

Art Hunkins

----- Original Message ----- 
From: "Fons Adriaensen" 
To: 
Sent: Friday, July 18, 2008 3:33 PM
Subject: Re: [Cs-dev] Ambisonic code


> 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 !
>
>
>
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's 
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great 
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the 
> world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Csound-devel mailing list
> Csound-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/csound-devel 


-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
Csound-devel mailing list
Csound-devel@lists.sourceforge.net