[vorbis-dev] Optimisations

[Timothy Wayper]

> (but damned fast!)  Does OggVorbis go off and do everything using single  
> precision floating point?  How does this affect the truncation of viable  
> bits after various multiplications (ie accuracy after a very big number is  
> multiplied by a very small number)?  I attended a DSP workshop last year by  

Actually, *adding* many small numbers to a large number is what endangers you most in floating point, while multiplication, in general, preserves your significant digits very well.

In fact, floating point multiplication accuracy is independent of the relative order of magnitude of the operands (except in limit cases). This is one of the advantages of floating point over fixed point (not to say fixed point is never appropriate).

Cheers,
Tim W.

____________________________________________________________
Timothy Wayper                        <timmy at wunderbear.com>
Wunderbear Software              <http://www.wunderbear.com>

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