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Diffstat (limited to 'introduction.tex')
| -rw-r--r-- | introduction.tex | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/introduction.tex b/introduction.tex index 6e7c441..7a06bfa 100644 --- a/introduction.tex +++ b/introduction.tex @@ -74,12 +74,13 @@ become very difficult, if not impossible to acquire licences for the available, which was part of Google's Android sources. This encoder has been extended with the necessary \dabplus{}-specific requirements (960-transform, error correction, framing, etc.), and now exists under the name -\mbox{FDK-AAC-DABplus}. +\mbox{fdk-aac}. The encoder \mbox{ODR-AudioEnc} can use this library to encoder +\dabplus{}. \subsection{Included Tools} The \mmbtools are composed of several software projects: \mbox{ODR-DabMux}, \mbox{ODR-DabMod}, -\mbox{Toolame-DAB}, \mbox{FDK-AAC-DABplus}, and other scripts, bits and pieces +\mbox{ODR-AudioEnc}, \mbox{ODR-PadEnc}, and other scripts, bits and pieces that are useful for the setup of a transmission chain. \subsubsection{ODR-DabMux} @@ -110,23 +111,24 @@ output. Other SDR platforms can be used if they are able to accept the I/Q data. The output of the modulator can also be used in GNURadio if format conversion or 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. Because of -this, twolame is not suitable for DAB. +\subsubsection{ODR-AudioEnc} +The ODR-AudioEnc encoder can be used to encode for DAB and \dabplus. It includes +a toolame-based MPEG encoder, and uses the \mbox{fdk-aac} library as an external +dependency to encode \dabplus{}. -The Toolame-DAB fork includes the ZeroMQ output and PAD insertion support, but -the audio coder is the same as the one in tooLAME. +The integrated TooLAME library 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. Because of this, twolame is not suitable for DAB. -\subsubsection{FDK-AAC-DABplus} -The FDK-AAC-DABplus encoder can be used to encode for \dabplus. The encoder -itself comes from the Android sources, and was written by Fraunhofer. - -The necessary framing and error-correction that \dabplus mandates, the PAD +The necessary framing and error-correction that \dabplus{} mandates, the PAD insertion, the ZeroMQ output and the ALSA input were then added by different parties. +\subsubsection{ODR-PadEnc} +This encoder is able to generate programme associated data that can be injected +into ODR-AudioEnc. It supports DLS, reading from a file, and MOT Slideshow, +where the slides are read from a folder. % vim: spl=en spell tw=80 et |