You can find 3ggp implementations and drafts at: http://www.3gpp.org/ftp/Specs/html-info/26-series.htm You can find their AAC HE PS floating point reference implementation at http://www.3gpp.org/ftp/Specs/html-info/26410.htm (Audio 48kbps test at http://www.mp3-tech.org/tests/aac_48/results.html) -- fenrir