For ambi-to-binaural, check out Brian Carty's
UDO using his new opcode.

Victor
----- Original Message ----- 
From: "Fons Adriaensen" 
To: 
Sent: Monday, July 21, 2008 4:59 PM
Subject: Re: [Cs-dev] Ambisonics Request


> On Mon, Jul 21, 2008 at 11:39:14AM -0400, Art Hunkins wrote:
>
>> Stereo ambisonic decoding in Csound never worked correctly, though I was
>> quite happy with the results of Victor's "kludge": to add four outputs 
>> each
>> of bformenc into the inputs of a stereo decode.
>
> If your source material is Ambisonic, i.e. the output of
> bformenc or any other software that generates B-format,
> or from an Ambisonic microphone, then the normal way to
> reproduce it in stereo is to send the summed B-format
> signals to a stereo decoder. That's not a 'kludge'.
> It's not normally called a 'decoder' but a virtual
> stereo microphone in that case, and you should have
> the options to set the direction the mics point at,
> their angle, and their polar pattern. There's no
> need to write an opcode for this, it's easy enough
> to code right into an instrument. Both L and R are
> just linear combinations of the B-format signals.
> So it's indeed just the same as panning, and if your
> only intent is to produce a normal stereo signal
> their is no reason to make the detour via Ambisonics.
>
> OTOH, if you only want to reproduce via headphones
> only there is a completely different way to handle
> things, and in that case it makes sense to go via
> Ambisonics. You can render Ambisonics on headphones
> by converting it to binaural, which means by calculating
> the signals that would be generated at the listeners
> ears if he/she were listening to an Ambisonic surround
> system.
>
> This is not so simple, it involves decoding the AMB
> signal and then using the HRIR 'head related impulse
> responses' by convolution.
>
> Apart from that there are techniques to make any
> synthetic sound more 'natural'. They can be used
> in Ambisonics, but are not 'Ambisonic' per se.
>
> Ciao,
>
> -- 
> FA
>
> Laboratorio di Acustica ed Elettroacustica
> Parma, Italia
>
> O tu, che porte, correndo si ?
> E guerra e morte !
>
>
>
>
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Available in new edition of Csound Journal!

http://www.csounds.com/journal/issue9/newHRTFOpcodes.html


Victor Lazzarini wrote:
> 
> For ambi-to-binaural, check out Brian Carty's
> UDO using his new opcode.
> 
> Victor
> 

-- 
View this message in context: http://www.nabble.com/Ambisonics-Request-tp18559963p18708735.html
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