For FM and AM networks, the STL constitutes the final leg where the audio content may be processed by coding algorithms. The content to this point may have been through several coding processes, some of which the Chief Engineer will have had no authority to influence i.e. content from affiliates, journalists using MP3 players to capture content, MP3 via ISDN or AAC via POTs.
Finally, latency must be a consideration. Radio stations will typically take content “off air” and into the DJ’s headphones for monitoring. As such, the duration from Mic to Transmitter back to Headphones should not be in excess of 20 milliseconds.
The Chief Engineer has to ensure:
- the network stays on air 24/7
- the content maintains an acoustic integrity which compliments the other equipment used by the station (Mic, Desk, Playout, Processor and Transmitter)
- the delay through the network is kept to an absolute minimum
- AND operational costs are contained where possible
APT codecs will provide the Chief Engineer with a range of tools to deliver all the above requirements.
STLs can operate over a number of different telecom links and configurations:
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