Re: [Drm-devel] MDI based transmissions, Experimental live broadcast in Budapest

[Rafael D. <ra...@ri...>]

You are right, Dream does not currently support transmission from an MDI
stream.

Rafael Diniz

On 6/9/19 12:01 PM, Ádám Kiss wrote:
> Dear DReaM Developers,
> 
> I am a student of the Budapest University of Technology and Economics,
> taking part in our DRM transmitter project. Basically we are on the air
> now, aiming to provide opportunity for signal propagation experiments
> and receiver tests still in the development phase.
> 
> We currently play out a 25-hour prerecorded program via mplayer to the
> onborad soundcard of a PC running Linux. Dream receives the data of the
> monitor port of this card, encodes the sound using FAAC, generates the
> baseband IQ samples of the DRM signal to be transmitted, then outputs
> these IQ signals through a SoundBlaster Live! card, which we feed into a
> Rohde & Schwarz IQ modulator (R&S SMIQ). This later one drives the
> consecutive power amplifier chain and antenna. (Further details can be
> found on www.drm.org <http://www.drm.org> and the monitored transmission
> is available here: nmhh.hu/drm <http://nmhh.hu/drm>).
> 
> Since our goal is to provide opportunity for all receiver manufacturers
> worldwide to test their products on a live system, we intend to transmit
> a stream which contains Journaline data and slide show as well in
> addition to the audio data. To this end we would have to feed an MDI
> stream into the DREAM modulator software. We tried to reconfigure DReaM
> to use this data stream, then we saw that this feature is not
> implemented yet. I checked the source code of DREAM and saw that MDI
> decoding is implemented, although it is not integrated with the
> transmitter module.
> Do you have any plans for implementing this feature in the near future?
> I would like to rely on free software as long as I can, and DReaM fits
> well to this objective.
> 
> Thank you for your consideration.
> With best regards
> Adam Kiss
> Budapest University of Technology and Economics
> Department of Broadband Infocommunications and Electromagnetic Theory
> HAM: HA8KDA
> 
> 
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