Coreaudio, pulse and Jack are float outputs. Should
we dither it (in doubles-version only of course)?

Victor
----- Original Message ----- 
From: "jpff" 
To: 
Sent: Saturday, October 18, 2008 2:28 PM
Subject: [Cs-dev] Question on Dither


> Reading around it seems that triangular distribution is preferred for
> dithering in audio (good compromise for speed and accuracy).
>
> At present the state in 5.09 and all csound5 previous is
>
> To file:   Nothing -- attempt at triangular but broken
> Alsa:      Always dithers uniform distribution
> PortAudio: Always dithers triangular distribution
> CoreAudio: Nothing
> Jack:      Nothing
> PulseAudio:Nothing
> WinMM:     Always dithers uniform distribution
>
> I have (untested, and broken) code to change this to
>
> To file:   triangular or nothing on -Z flag
> Alsa:      dithers uniform distribution or nothing on -Z flag
> PortAudio: triangular distribution or nothing on -Z flag
> CoreAudio: Nothing
> Jack:      Nothing
> PulseAudio:Nothing
> WinMM:     Always dithers uniform distribution
>
> The questions:
>
> Should we offer uniform or triangular or user choice?
> Should we fix Coreaudio and pulseaudio to be in line?
>
> Or what?
>
> I should say this is all for 16bit audio.  Nothing done on floats or
> 24bit.  8bit ....less sure at present
>
> And for completeness, csound4 had user selectable uniform in all
> formats I think
>
> ==John ffitch
>
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> Coreaudio, pulse and Jack are float outputs. Should
> we dither it (in doubles-version only of course)?

I think it is Ok as it stands.  Still questions of
rectangular/triangular etc

==John ffitch

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