[speex-dev] SHARC DSP

Jean-Marc Valin Jean-Marc.Valin at USherbrooke.ca
Thu Dec 18 20:16:05 PST 2003

Le jeu 18/12/2003 à 22:10, Devendra Jalihal a écrit :
> I don't know about SHARC. We have G.723/G.729 running on ADSP 2181 taking 
> approx 25 MIPS. The best reported implementation of these take 16 MIPS. 
> Basic speex is  about 1.5 times computationally more complex 
> than these in the basic CELP part. Preprocessing might add a little more. 
> Depending on how the integerization proceeds, speexs might night 
> anywhere up to 40 MIPS on fixed-point DSPs. But SHARC being a floating 
> point DSP, is a different beast altogether.

Actually, I think Speex should be about the same complexity as G.723.1.
At 8 kbps with complexity 1 (default is 3), it requires around 10 mflops
and once converted to fixed-point, it's around 15 MIPS (not including
shifts, loop overhead and things like that).


Jean-Marc Valin, M.Sc.A., ing. jr.
LABORIUS (http://www.gel.usherb.ca/laborius)
Université de Sherbrooke, Québec, Canada

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