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mathiasc

Member Since 27 Dec 2011
Offline Last Active 30 Dec 2011 21:59
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Posts I've Made

In Topic: RTL2832U chipset support proposal

28 December 2011 - 21:40


Apart from opendab, there's also openmokast project: http://openmokast.org/crc-dabrms.html
It runs on linux and takes various inputs. It had been adapted to the Albrecht DAB USB stick (expired) so it could probably be adapted.


Thanks, this seems to be a nice implementation of DAB on mobile devices, and looks more promising than the OpenDAB project.

Now the question, is more "what's come out of the stick when in DAB" ? I'm not sure it is just the DAB subchannel, I heard that they send sort of a baseband sampling of the DAB signal and that everything is demodulated in software. An USB analysis from a friend had shown high bitrate transfer when in DAB mode, this could explain the thing.


Probably you are right, I doubt that Realtek bothered to develop a real DAB demodulator in hardware, due to the low market demand for this devices. The proprietary software demodulator will probably only run on x86 hardware, and probably only on Windows.
But let's wait and see, IIRC Realtek promised to release a SDK for DAB (for PC).

AFAIK, DAB mode is not supported in the Linux driver, at the moment.



Thank you.

I first thought it was supported with DTMB but it is the chinese television system not T-DMB the DAB based mobile television system :-(
At least I hoped it was possible to tune and get some raw stream.
Realtek said already last summer that they will add support for DAB in Linux but I have not seen news so far.

I heard also that it is Fraunhofer that has provided the DAB decoding suite on the PC, probably this:
http://www.iis.fraun.../pd/dab/dek.jsp

I hope that the linux implementation is not blocked by any NDA or other.
If the chip is giving the baseband signal, this could open the way to interesting application like getting the full content of the DAB mux at once, maybe even process impulse response of the channel.

I cannot wait, has anybody a hardware USB analyser to record DAB traces ? ;-)

In Topic: RTL2832U chipset support proposal

27 December 2011 - 18:13

I've an of interesting info.

Every DVB-T USB stick based on RTL2832U and tuners FC0012 or FC0013 or FC2580 or E4000 IS DAB RADIO CAPABLE
It's only a player issue (tnx Realtek for info).

Tested (by Xgaz) with my DIKOM USB DVBT stick with Windows Terratec DAB player http://ftp.terratec....tup_4.0.092.zip and original DIKOM driver.
Well .... It works !!

Posted Image

Ok, Enigma2 doesn't support DAB :( :( :( :(

Anyone knows a Linux DAB Player ? I wish to test my stick .... but I've found nothing about Linux (Ubuntu) and DAB ...


Hello,

Apart from opendab, there's also openmokast project: http://openmokast.org/crc-dabrms.html
It runs on linux and takes various inputs. It had been adapted to the Albrecht DAB USB stick (expired) so it could probably be adapted.

Now the question, is more "what's come out of the stick when in DAB" ? I'm not sure it is just the DAB subchannel, I heard that they send sort of a baseband sampling of the DAB signal and that everything is demodulated in software. An USB analysis from a friend had shown high bitrate transfer when in DAB mode, this could explain the thing.

Otherwise, if it is a demodulated signal, it can be either a fraction of the multiplex or the complete mux (1.5Mbits/s). Various formats exist ETI (Ensemble Transport Interface) or RDI (Receiver Data Interface).
If you have something already functional or a dump of a stream, I could try to have a look. It would be really nice to have an open receiver as no open receiver exists for DAB at the moment.

Mathias