[Speex-dev] Another ? about Speex and CPU

Jean-Marc Valin jmvalin at jmvalin.ca
Wed Feb 29 20:51:10 PST 2012

On 12-02-29 11:29 PM, dbazinet at sunex.ca wrote:
> So another question:
> - Is there a difference of performance/quality between the floating
> point and the fixed point? Actually, what's the main difference?

There's a tiny quality difference, but I doubt you'll notice it --
especially at 8 kb/s. The main difference is speed. If there's an FPU
present, then you'd need to check which version is the fastest. On x86,
float is typically faster than fixed-point, but on the newer ARMs (with
an FPU), fixed still tends to be faster.


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