[gmpi] Re: using another plugin API
- From: "Michael Gogins" <gogins@xxxxxxxxxxxx>
- To: <gmpi@xxxxxxxxxxxxx>
- Date: Sat, 26 Apr 2003 11:24:01 -0400
This debate is not ridiculous to me. I and others do hear a difference, and
it is not a bug. My theory is that with 32 bit Csound, after each arithmetic
operation, the result is rounded off to single precision. With 64 bit
csound, the result is rounded off to double precision. I believe this is
source of the audible difference. In a complex score there would seem to be
enough such rounding operations to move the rounding errors up above the
noise floor.
===========================================
Michael Gogins
gogins at pipeline period com
Irreducible Productions
Silence, a language for programming music and sound
Available at http://www.csounds.com
===========================================
----- Original Message -----
From: "Vincent Burel" <vincent.burel@xxxxxxxxxx>
To: <gmpi@xxxxxxxxxxxxx>
Sent: Saturday, April 26, 2003 11:14 AM
Subject: [gmpi] Re: using another plugin API
>
> ----- Original Message -----
> From: Michael Gogins
> To: gmpi@xxxxxxxxxxxxx
> Sent: Saturday, April 26, 2003 2:11 AM
> Subject: [gmpi] Re: using another plugin API
>
>
> >The issue of 64 bits is not only dynamic range, but also arithmetic
errors.
>
> no sorry, the arithmetic error depends how you manage your computation of
> your processing and the abilities of your processor, not depending on type
> of the data you receive. Again for routing or streaming , float32 is
enough.
> and also applicable to DSP (64 bits not ).
>
> >I ran the same piece in 32 bit Csound (all audio signals in single
> precision
> float) and in 64 bit Csound (all audio signals in double precision float).
> In both cases output was a 32 bit float soundfile played through an
M-Audio
> 24 bit converter. The difference was audible in the highs and in
instruments
> with a lot of filters.
>
> if you hear a difference it means that you get an error > 60 db ! this
> sounds like a bug somewhere :-))
>
> This debat is ridiculous, and makes me in despair ...
>
> Vincent Burel
>
>
>
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