[vorbis] tool for listening tests

Monty xiphmont at xiph.org
Mon Jan 7 14:47:00 PST 2002



On Mon, Jan 07, 2002 at 10:02:56PM -0000, James Chapman wrote:
> > Is this application pre-decompressing the mp3/wma/ogg inputs?  Don't
> > forget that processor noise shows up on most internal soundcards, and
> > the harder the processor works, the more noise.
> 
> No, it's just decoding when necessary to top up the output buffer, no
> pre-decompression. I didn't really think about external noise of any kind,
> as I didn't realise it would have that much of an effect on the final
> output. You live & learn :)

In most cases, it won't.  Still, any occasional skew (and there will
be some) will show up in the globally collected results.

DMA to the sound hardware causes noise too of course, but it will be
roughly even for each sample.

Monty

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