Transmitting voice with Osmocom
mad at auth.se
Thu Apr 28 15:49:54 CEST 2011
> A firm from Turkey called Aselsan succeeded to make encrypted conversation
> over GSM. It transfers the voice data (1.2 kbit/s ) with Synthetic
> Voice Modulator technology.
Looks promising, but 1.2k and even 2.4k are _very_ low bitrates for voice transmission. Quality will be accordingly bad, probably enough for military purposes where people are trained to communicate reliable over a weak communication link by talking procedures. The 1.2k codec might be about comparable to LPC-10 at 2.4k (a guess, never testet SB-LPC) which sounds quite bad, a very artifically sounding voice not really suitable for everydays conversations.
None the less it's a very interesting possibility being able to transmit data over voice channels, this should be researched as with the traffic-branches we now have the right tools at hand.
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