VoIP calls typically require approx. 120 kbit/s *each*
direction, that's 240 kbit/s for a two-way conversation.
UMTS gives you 384 kbit/s if you're lucky. Most of the time
it's more like 150 kbit/s, so VoIP will only work with
very poor quality.
Also, most data plans specifically prohibit VoIP usage
and may even prevent it technically.
VoIP over cellular is just not feasible at this point.
The pre-paid data is interesting, though, from a competitive
standpoint.
-- Terrence
ROB wrote:
Bit rate=sampling rate x bit depth
1kb/s isn't going to get you too much audio. Try encoding an mp3 at
1kb/s to see how audible that would be. I think you'd be looking at
something more along the lines of 32-64kb/s to get anything that you
could understand. It might be easier to make a phone call.
Conveniently enough, I think the device will have that capacity as
well.
On 2/2/07, Robert Michel <[EMAIL PROTECTED]> wrote:
Salve!
Does anybody has experiances/ideas about Voice over GPRS?
How long is the delay? It could maybe used for asyncron
voice communication Talk2Talk (instead of pushing a button)
In Germany did three Prepaid Provider published new Tariffs
with 0.24Euro/MB.
German pages:
http://teltarif.de/arch/2007/kw05/s24754.html
data cost calculator:
http://teltarif.de/mobilfunk/datenrechner.html
I think with this tariffs using mobil data becomes
interesting ;)
By using 1KB/s for audio and some overhead, let
us say 2 KB/s 0.24Euro/MB = 24 Cent for 500 seconds,
60 seconds makes then about 3 cents. When both using
this 6 cents. Hmm that would be interesting when
the user makes often make brakes/pause in their talk.
Greetins,
rob
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email;internet:[EMAIL PROTECTED]
title:Evangelist, Java Mobile & Embedded Community
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