Speex dev - Aug 2004 - @Christian Buchner: speex acm & netmeeting

> Yes! It works! I tried mono 8kbit 8khz Q3 and it seems to work! I am 
> currently talking to a friend, both ends using Speex!
> Sound Quality is not as good as speeak freely@adpvm, but it uses only 
> quarter of bandwidth and for that the quality is not bad. Perhaps I'll 
> try Q4, as well.
Q4 and Q3 seem to produce the same results. Internally speex is controlled
by tables defining coding parameters for various quality levels. In this
case there is no difference between 3 and 4.

Here's the 16 bit Mono mode list

           79, 320,	8,	3950,	// 16000 1 0
          115, 320,	8,	5750,	// 16000 1 1
          155, 320,	8,	7750,	// 16000 1 2
          196, 320,	2,	9800,	// 16000 1 3
          256, 320,	1, 12800,	// 16000 1 4
          336, 320,	1, 16800,	// 16000 1 5
          412, 320,	2, 20600,	// 16000 1 6
          476, 320,	2, 23800,	// 16000 1 7
          556, 320,	2, 27800,	// 16000 1 8
          684, 320,	2, 34200,	// 16000 1 9
          844, 320,	2, 42200,	// 16000 1 10

As you can see Q4 and Q5 are good candidates providing one
frame per block at rates of 12800 and 16800 bits/sec.

The fact that your mode registered twice may be because you may
have forgotten to unregister your previous attempt ;) There is
a separate API call to remove a codec from Netmeeting again.

Christian

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> As you can see Q4 and Q5 are good candidates providing one
> frame per block at rates of 12800 and 16800 bits/sec.
ah, OK, now I understand the list. :-)
> The fact that your mode registered twice may be because you may
> have forgotten to unregister your previous attempt ;) There is
Nope, I unreg'ed the other codec and furthermore I already reg'ed two 
diffenrt speex modes before and that went alright (except functionality 
in nm, of course.)

SO I'll try the 16kHz modes next, as they should really be an 
improvement to quality and clarity. I'll sort out the sources now and 
mail them to you.

D A

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> As you can see Q4 and Q5 are good candidates providing one
> frame per block at rates of 12800 and 16800 bits/sec.
> SO I'll try the 16kHz modes next, as they should really be an 
> improvement to quality and clarity. I'll sort out the sources now and 
> mail them to you.
Thanks for your hacked up instcodec source code. I installed the 16.8
kbit/s 16kHz Q5 mode and it worked instantly. It offers a pretty decent
and clear sound quality.

I was only doing some testing from one PC to another on my home LAN
and so far I am impressed.

Christian

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