Thank you. You're right ... my error ... I meant
to say 12 bytes (including the 2 bytes for VAD).
And it is 10ms/frame. No matter ... thank you for
the SPEEX specs. In terms of quality, what SPEEX
bit rate compares with G.729 at 8kbps data rate
please? Is there some reason why you chose the
20ms frame rate? Do you keep that same frame rate
for the different bit rates? The faster frame
rate would seem to better adapt to multiple
speakers cutting in and out ... yes/no?
Btw, 6 bytes/frame at 50 frames/second seems to
be 2.4kbps so I'm guessing that the lower rate
you mentioned is because of some overhead for VAD in your 6 bytes.
At 07:11 PM 5/3/2007 +1000, Jean-Marc Valin wrote:>B. Mitchell Loebel a ?crit :
> > 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).
>
> Jean-Marc
---
B. Mitchell Loebel, CEO, VP
Engineering 408 425-9920
InstaFlash International Corporation
(formerly Minute-Tape International Corporation)
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