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Diffstat (limited to 'introduction.tex')
| -rw-r--r-- | introduction.tex | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/introduction.tex b/introduction.tex index 849849d..e7eb35a 100644 --- a/introduction.tex +++ b/introduction.tex @@ -33,14 +33,14 @@ composing a \mmbtools transmission chain, and how to set one up. \subsection{Origins} In 2002, Communications Research Centre Canada\footnoteurl{http://crc.ca} started developing a DAB multiplexer. This effort evolved through the years, and -was published later\sidenote{when?} as \mbox{CRC-DabMux} under the GPL +was published in September 2009 as \mbox{CRC-DabMux} under the GPL open-source licence. CRC also developed a DAB modulator, called \mbox{CRC-DABMOD}, which could create baseband I/Q samples from an ETI file. This I/Q data could then be set to a hardware device using another tool. For the Ettus USRPs, a ``wave player'' script was necessary to interface to GNURadio. Only DAB Transmission Mode 2 was -supported. \mbox{CRC-DABMOD} was also released under the GPL\sidenote{when?}. +supported. \mbox{CRC-DABMOD} was also released under the GPL in early 2010. As encoders, toolame could be used for DAB, and CRC developed a closed-source \mbox{CRC-DABPLUS} \dabplus encoder. @@ -52,7 +52,7 @@ part of the \mbox{CRC-mmbTools}. These tools made it possible to set up the first DAB transmission experiments. In 2012, these tools received experimental support for single-frequency -networks, a functionality that has been developed by Matthias P. Braendli during +networks, a functionality that has been developed by Matthias P. Brändli during his Master's thesis\footnote{The corresponding report is available at \url{http://mpb.li/report.pdf}}. Because SFNs only make sense in TM 1, CRC subsequently released a patch to @@ -62,9 +62,9 @@ At that point, involvement from CRC started to decline. The SFN patch was finally never included in the \mbox{CRC-mmbTools}, and as time passed by, the de-facto fork on \url{http://mpb.li} was receiving more and more features. Having two different programs with the same name made things complicated, and -the tools were officially forked with the approval of CRC in Feb 2014, and given -the new name \mbox{ODR-mmbTools}. They are now developed by the Opendigitalradio -association. +the tools were officially forked with the approval of CRC in February 2014, and +given the new name \mbox{ODR-mmbTools}. They are now developed by the +Opendigitalradio association. In April 2014, the official \mbox{CRC-mmbTools} website went offline, and it has become very difficult, if not impossible to acquire licences for the @@ -110,7 +110,8 @@ graphical analysis (spectrum) is to be done. \subsubsection{toolame-dab} TooLAME is a MPEG-1 Layer II audio encoder that is used to encode audio for the DAB standard. The original project has been unmaintained since 2003, but the -twolame fork that pursues the development removed the DAB framing. +twolame fork that pursues the development removed the DAB framing. Because of +this, twolame is not suitable for DAB. The toolame-dab fork includes the ZeroMQ output and PAD insertion support, but the audio coder is the same as the one in tooLAME. |