  speex is a patent-free audio compression format designed for speech and also a free software speech codec that may be used on voip applications and podcasts.xiph.org speex: a free codec for free speech, retrieved 2009-09-01 it is based on the celp speech coding algorithm.xiph.org introduction to celp coding, retrieved 2009-09-01 speex claims to be free of any patent restrictions and is licensed under the revised (3-clause) bsd license. it may be used with the ogg container format or directly transmitted over udp/rtp. the speex designers see their project as complementary to the vorbis general-purpose audio compression project. speex is a lossy format, meaning quality is permanently degraded to reduce file size. the speex project was created on february 13, 2002.xip
Free_audio_codecs GNU_Project_software Speech_codecs Xiph.Org_projects