Speex - Open audio codec designed for speech, part of the Xiph.org Foundation. MPE Secure Media - Secure streaming media format giving authors, songwriters and publishers complete control over products distributed through the internet. Study on Audio Compression - Detailed comparison of various audio compression algorithms including ASF, RealAudio, MP3, Ogg Vorbis, MOV, and VQF. The Void: PC Audio Resource - Information about computer audio formats and sound cards. Musepack - Open audio compression format also known as MPC or MPEGPlus/MP+. Based on MPEG1 Layer-2/MP2 algorithms. OptimFROG - Loseless audio compression supporting IEEE Float audio data. True Audio - Open lossless audio codec developed with the main requirements of reasonable compression level and high operation speed. WavPack - Open audio codec facilitating both loseless compression and a unique hybrid compression mode. ATRAC: Adaptive Transform Acoustic Coding for MiniDisc - ATRAC is an audio format based on psychoacoustic principles originally used for Sony MiniDisc players. Opus Codec - Open standard, high quality codec. Presentation, documentation, comparison with other formats, download links, source code repository. Free Lossless Audio Codec - FLAC is an open source lossless audio codec, supports streaming, seeking and archival. AC3Filter - DirectShow AC3 filter.