Hello,
there is now a test sample (bit file) with speech at
http://tetra.osmocom.org/trac/wiki/Test_Samples
Please only add samples to this page if you have the full
agreement for publishing from all involved parties (e.g.
operator of the network, people speaking during the capture).
This is not the place to share captures which were made
from someone else without their knowledge.
Best regards,
Dieter
--
Dieter Spaar, Germany spaar(a)mirider.augusta.de
First Osmocom GMR code release
As some of the readers may already know, a couple of Osmocom developers
have been working on a new sub-project: OsmocomGMR.
The primary goal of this project is to provide a reusable and clean
implementation of the various layers of GMR-1.
What is GMR-1 ? Well, it stands for "GEO Mobile Radio" and it's a set of
specifications describing a satellite based mobile phone network heavily
inspired from GSM. One of the major commercial operators of GMR-1
technology is "Thuraya", providing coverage over
Europe/Africa/Asia/Australia.
So far the implementation focused on the lowest layers:
* Physical layer with FCCH sync and demodulation support for
* pi4-CBPSK and pi4-CQPSK bursts.
* Channel coding layer (scrambling/puncturing/convolutional
coding/crc/interleaving/...)
And some ancillary tools to exploit those:
* A good capture tool to listen to particular ARFCN(s) and
channelize them properly
* Wireshark support (BCCH only so far)
The first 'demo application' using all of the above provides
functionalities similar to what airprobe is for GSM: An air interface
protocol analyzer that goes all the way from capturing data off-the-air
to sending packets to wireshark for analysis. Limited to BCCH only
currently but this will evolve with time.
Development was mainly done by Sylvain Munaut, with help from Dimitri
Stolnikov (early signal captures and his great capture tool), Harald
Welte (initiating the project) and Steve Margraf (testing different
setup and antenna ideas).
If you'd like to know more, you are encourated to read the wiki
(http://gmr.osmocom.org/) and join the mailing list
(http://lists.osmocom.org/mailman/listinfo/gmr)
--
- Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)
hello
here are some requests for improvement on osmotetra :
1- after tetra-rx out to console : the way to see who is calling who ?
source ID , target ID ,individual call ,TMO , ....
2- real time listening -traffic.out acting as a Fifo
thanks
--
Dear All..
Finally I can use OSMOCOM-Tetra to decode some Tetra signal by Wireshark.
But I have met some problems when speech decode the files on the mailing
list.
1. It's always show "0 Channel Frames processed ie 0 Speech Frame"
message when I input a bits file(whatever converting from OSMOCOM-Tetra or
download from the mailing list providing) to "cdecoder" program.(Of course
it will output a useless "blank file".)
2. I tried to input the sample bits files into "sdecoder" program and
it can convert a PCM file. If I use some playback programs include aplay(-f
S16_LE) to play the PCM file, there's no any readable speech.
Does anyone can help me to check this? I don't know what point I missed.
Thank a lot!
Best Regards
Eddy.
Hi all,
i was wondering if to buy one U-RFX, with the aim of testing it with various projects.
Considering that:
- are fully compatible with USRP [1];
- are seen as the useful WBX;
- i don't have yet a WBX...
that would be the perfect substitute for the WBX (imho).
Someone has already tried it? Impressions?!
[1] http://www.ruby-forum.com/topic/1266576
Cheers,
Luca.
P.S.: I apologize for the cross-posting.