First licensed open dab transmission

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Revision as of 15:26, 13 October 2010 by Coinchon (Talk | contribs)

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For the first time, the open source encoder, multiplexer, modulator designed by CRC (MMBTools) will be used for a licensed local transmission during Label Suisse festival for a performance done together with MXLabs.

Swiss Administration has granted a 8 channels DAB multiplex to be used on air on channel 10A during the festival between 17th to 19th September in Lausanne.

The installation will consist of a single PC running Linux and with a 8 channels soundcard and USRP doing the DAB encoding, multiplexing and modulation. This transmission will transmit in DAB the audio of a mosaic of 8 music bands that will be video projected for the performance. DAB Radios tuned to all these channels will then be spread all over the place and people will also receive free receivers.

It is already a long time that people are experimenting DAB transmission using CRC MMBTools and Open Software Defined Radio but it is is the first time it is used for a licensed transmission. This milestone demonstrate that digital radio has become democratized not only for experimentation but also for local or ultra-local transmission.

The installation consist of a recent AMD PC and a USRP Generic Software Radio Platform for the transmission. The software tools ar CRC MMBtools with custom linux scripts and python code.

More details details about the technical installation, pictures, etc to follow...

For more information: Mathias Coinchon (broadcast at opendigitalradio.org) or Stanislas Roehrich (http://www.maxxima.org).

Links:

See also:

Setup

Hardware:

  • dualcore AMD PC running (ubuntu) linux
  • M audio delta 1010 soundcard
  • USRP1 Universal Software Radio Peripheral
  • Mini-circuits bandpass filter

Software:

Event Pictures and video

Video of the performance:


(thumbnail)
Radio Mount for the Ceiling
(thumbnail)
Fixing the Screen
(thumbnail)
Dab Mux test, 8 Live Audio Channels from the Delta1010
(thumbnail)
Video Mosaïc
(thumbnail)
Dab Mux In A box !
(thumbnail)
Radio Tuning ;)
(thumbnail)
Audio Triming... lipsync
(thumbnail)
DAB enc/mux/mod in a box
(thumbnail)
Content of the black box (pics by Stefan Heimers)


  • Working finally !

IMG 0461.jpg

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