ODR – part 2

The “ODR-AudioEnc” module

This module will convert the offered audio signal to a HE-AAC (v1 or v2) format. Important to remember is that this HE-AAC uses a 960 sample window. We explain the difference here.

The audio signal can be presented to the “ODR-AudioEnc” module in different ways:

– via an (external) sound card, in AES-EBU or on line level

– via a (web)stream

– via a sound file

Since a digital conversion takes place in the “ODR-AudioEnc” module, it must be taken into account that the quality of the offered audio signal is as high as possible: WAV music files as source and at least 96 kbps AAC as STL. It is also important to provide sufficient headroom so that the input is not overdriven.

“ODR-AudioEnc” will send the HE-AAC (v1 or v2) signal via tcp to the “ODR-DabMux” module. This offers the great advantage that the DAB+ audio encoder can be placed in the studio of any radio station. The HE-AAC signal can then be sent to the “ODR DabMux” via network or the Internet.

Installation instructions and how to use ODR-AudioEnc are described at the “ODR-AudioEnc github“. To make choosing the different options of the DAB audio encoder easier, there is the “ODR-EncoderManager“. But we will come back to that too later

The “ODR-PadEncoder” module

This module allows adding PAD (Program Associated Data) per radio broadcast: song info, program info, MOT (Multimedia Object Transfer) slideshows, and so on. Installation instructions can be found at the “ODR-PadEncoder github“.

PAD can also be easily added via the “ODR-EncoderManager“.

The “ODR-DabMod” module

This is a DAB modulator for use with exciters such as “Lime SDR“, among others. Installation instructions are available at the “ODR-DabMod github“.