Speex 1.1.10 Unstable

Speex is specially designed for compressing voice at low bit-rates. It is an audio codec designed especially for voice signals and providing good narrowband and wideband quality. It aims to be complementary to the Ogg Vorbis codec.
Ссылка: http://download..eleases/speex/speex_win32_1.0.4_setup.exe