[Speex-dev] SPEEX tech specs

Jean-Marc Valin jean-marc.valin at usherbrooke.ca
Thu May 3 02:11:30 PDT 2007

B. Mitchell Loebel a écrit :
> How many bits do you have in a frame please and what is your frame rate?
> For example, G.729 (ACELP) has 12 bits/frame including VAD and the frame
> rate is 100/second ... I'm looking for the comparable figures for SPEEX.

I'm sorry but if G.729 used 12 bits/frame at 100 frames/second, it would
have a bit-rate of 1.2 kbps. G.729 actually uses 10 *bytes* (i.e. 80
bits) per frame. Speex has 20 ms frames (50 frames per second) and
supports bit-rates that range from 2.15 kbps (6 bytes per frame) to 44
kbps (110 bytes per frame).


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