[music-dsp] fixed point fft?

[Mike Marchywka]

> Maybe it's the ability to claim bit-perfect CRC-passing compression. 
> Although I would think that the 50th bit in the PPC FPU would still 
> remain below at least 16-bit precision in the final result.
> And anyway, isn't IEEE floating point math pretty well defined?

It can be nice for verification and testing.
I personally consider floating point calculations to be stochastic:) 
You can't even guarantee that you will get the same result from build
to build with most decent compilers ( compare debug to release build from
MS compilers and look at some options they have to select fp code generation)
unless you pick the right options and there is strict standards compliance. 
If you really need this, Java would be a good thing to consider. 


> -----Original Message-----
> From: Vesa Norilo [mailto:warder at dlc.fi]
> Sent: Sunday, April 20, 2003 5:32 PM
> To: music-dsp at aulos.calarts.edu
> Subject: Re: [music-dsp] fixed point fft?
> 
> 
> Maybe it's the ability to claim bit-perfect CRC-passing compression. 
> Although I would think that the 50th bit in the PPC FPU would still 
> remain below at least 16-bit precision in the final result.
> And anyway, isn't IEEE floating point math pretty well defined?
> 
> Vesa
> 
> >What's the application for which you need it to be truly
> >lossless?
> >
> >The original analog-to-digital conversion process probably
> >introduced more noise than the noise floor of a 32-bit
> >float. Worrying about what's going to happen to the 50th
> >bit when a PowerPC FPU decodes something that was encoded
> >by an Intel FPU seems silly.
> >
> >-Borogove
> >
> >
> >dupswapdrop -- the music-dsp mailing list and website: 
> subscription info, FAQ, source code archive, list archive, 
> book reviews, dsp links http://shoko.calarts.edu/musicdsp/ 
> >http://ceait.calarts.edu/mailman/listinfo/music-dsp
> >  
> >
> 
> 
> 
> dupswapdrop -- the music-dsp mailing list and website: 
> subscription info, FAQ, source code archive, list archive, 
> book reviews, dsp links http://shoko.calarts.edu/musicdsp/ 
> http://ceait.calarts.edu/mailman/listinfo/music-dsp
>