Subject: RE: [ecasound] need some buffering advice
From: Jamie Lutch (jlutch_AT_altairinc.com)
Date: Thu Sep 25 2003 - 04:38:32 EEST
yes, i see this, when compared with a source file, there was a bit of
rounding, if you invert the source and recorded wav, it cancels down
to -141db, so it looks like the least significant bit is being rounded
fortunately, thats well below the resolution of any practical device..
> -----Original Message-----
> From: ecasound-list-owner_AT_wakkanet.fi
> [mailto:ecasound-list-owner_AT_wakkanet.fi]On Behalf Of Kai Vehmanen
> Sent: Wednesday, September 24, 2003 6:07 PM
> To: ecasound-list_AT_wakkanet.fi
> Subject: RE: [ecasound] need some buffering advice
> On Wed, 17 Sep 2003, Jamie Lutch wrote:
> >> No dithering, but the data is converted from 32bit integers to
> >> 32bit float and then back to 24bit integers.
> > the question being, is the 24bit file recorded bii-for-bit
> identical to the
> > 24-bit input source? seems so, but I figure I'd ask.
> Yes, it should be. I say 'should' as the all the audio data does go
> through two conversions (int->float, float->int) and bugs and/or rounding
> errors are always possible. Ecasound does have a small test suite for the
> conversion routines, so they should be ok, but I don't want to give any
> guarantees. If bit-level accuracy is important, you should verify the
> Audio software for Linux!
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