This paper introduces Silk, CELT, and BroadVoice that are available in the internet as open source voice codecs. Their voice quality is evaluated with a subjective listening test. AMR, AMR-WB, G.718, G.718B, and G.722.1C were used as stan- dardized references. In addition Skypeís Silk codecís peculiar bandwidth and bitrate characteristics are examined in more detail.
Bibliographic reference. Rämö, Anssi / Toukomaa, Henri (2010): "Voice quality evaluation of recent open source codecs", In INTERSPEECH-2010, 2390-2393.