The history of transporting audio over telecommunications networks is a checkered one, with incompatibilities, inconsistencies and the questions of its reliability to give us the performance we need as broadcasters. The introduction of IP based audio codecs into the broadcast chain has raised the same questions. The characteristics of IP based networks are vastly different from those of the synchronous networks we have used in the past. Manufacturers have overcome/exploited those characteristics to enable the use of IP based codecs in the broadcast chain without reducing or eliminating the features which older technologies offered the broadcast network to enhance their performance. This paper provides a brief overview of the history of the audio codec, and examines the State-of-the-Art IP codecs now available. We also look at some of the technical challenges that have been overcome in order to incorporate IP codecs into broadcast networks and some of challenges still to overcome.
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