25 May
2005
25 May
'05
4:27 p.m.
On Wed, May 25, 2005 at 12:47:11PM -0400, M P Smoak wrote:
Thanks for your reply.
On Tuesday 24 May 2005 15:58, anahata wrote:
GSM is used to refer both to a system of communication for cellular
phone networks and to the voice compression codec typically used in
those networks. The gsm compression codec can be used independently
from the cell phone network.
Some quick googling found this:
http://kbs.cs.tu-berlin.de/~jutta/toast.html
But, again, I would also suggest looking at speex:
http://www.speex.org/
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On Tue, May 24, 2005 at 02:44:04PM -0400, M P
Smoak wrote:
Yes, I think I can use a lower quality ogg file or perhaps mp3.
And I looked a bit at resampling. Am I correct in thinking that
it is good to record a high sample rate (say 44K), then normalize
the recorded conversation, and then resample to a lower sample rate
and save as an ogg or mp3?
In my work I use telephone in similar ways. In
both cases,
phone calls are data.
But it's too big. Saving it as a .ogg file with quality = 4
gets it down to about 5 meg, I think. So the question is
what's a good way to shrink it down?
For voice you could get away with a lower
quality ogg and/or
resampling to a lower sample rate (digital telephony itself
uses 8kHz) For the ultimate in voce compression however,
there are free
GSM compression/decompresison tools. In debian the gsm-utils
pachage seems to the the thing you need, no doubt will pull in
all the various libgsm* packages too. I haven't used it, but
if you can get it to do what you want you waon't get better
voce compression.
You really lost me here. gsm-utils package is for
communicating
with mobile phones. We are using conventional telephones, with
linux being involved only for recording and saving the calls on
conventional desktop/workstation machines. Presently, I record
using linux via rezound; audacity could be used instead on
the prefessors Windows laptop. Which linux/windows/mac recorders/
players utilize gsm compression?