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Hi all, Has anyone tried conveying signaling tones (DTMF) through speex? If so, can i get an idea of the lowest bit-rate at which I can do so with 'tolerable distortion'. G.728 does so and G.729E (11.8 Kbps mode) is 'claimed' to do so but even if true, G.729 (rather G.729I - 11.8/8/6.4 kbps) does not allow me to go below 6.4 kbps if needed. Basically I am looking for a single codec

Hi Jean, Thats great news for me to start off with as I was planning to go with 16 Kbps ADPCM keeping in mind the issues and options I had. Now, whether the additional computation cost is worth the significant bandwidth savings, I have to see. Just wondering if it is possible to extend this logic to G3 and G4 fax as well, i.e. using a higher bit-rate and complexity mode for modem or fax instead of

In case a system is incapable of fax relay or if it is disabled, one of the easiest and safest options is to go for 40 kbps ADPCM compression (for fax upto 14.4 kbps)..even am new to this problem and the fair bit of seraching which i've done seems to suggest that the standard sloutions are to simply 'bypass' it else compress using ADPCM (40 k for fax upto 14.4 k, 32 k for fax upto 9.6

Hi Mainak, Speex will definitely be able to handle DTMF. The only question is what the minimum rate for that will be. I remember testing on a few tones at 8 kbps and I didn't hear too much distortion (though there have have been). The only thing I can recommend is to use a higher complexity setting that one would normally use. For voice, I can't really tell the difference between quality

Mainak Chakraborty wrote: > Hi Jean, > Thats great news for me to start off with as I was planning to go with > 16 Kbps ADPCM keeping in mind the issues and options I had. Now, whether > the additional computation cost is worth the significant bandwidth > savings, I have to see. > Just wondering if it is possible to extend this logic to G3 and G4 fax > as well, i.e. using a