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» AC3Filter

DirectShow AC3 filter.

http://ac3filter.sourceforge.net/

» ATRAC: Adaptive Transform Acoustic Coding for MiniDisc

ATRAC is an audio format based on psychoacoustic principles originally used for Sony MiniDisc players.

http://www.minidisc.org/aes_atrac.html

» Free Lossless Audio Coder

FLAC is an open source lossless audio codec, supports streaming, seeking and archival.

http://flac.sourceforge.net/

» Lossless compression vs. speed

Comparisons of most popular lossless audio formats.

http://web.inter.nl.net/users/hvdh/lossless/main.htm

» MPE Secure Media

Secure streaming media format giving authors, songwriters and publishers complete control over products distributed through the internet.

http://www.destinympe.com/

» Musepack

Open audio compression format also known as MPC or MPEGPlus/MP+. Based on MPEG1 Layer-2/MP2 algorithms.

http://www.musepack.net/

» OptimFROG

Loseless audio compression supporting IEEE Float audio data.

http://losslessaudiocompression.com/

» Speex

Open audio codec designed for speech, part of the Xiph.org Foundation.

http://www.speex.org/

» Study on Audio Compression

Detailed comparison of various audio compression algorithms including ASF, RealAudio, MP3, Ogg Vorbis, MOV, and VQF.

http://ekei.com/audio/

» The Void: PC Audio Resource

Information about computer audio formats and sound cards.

http://www.voidaudio.net/

» True Audio

Open lossless audio codec developed with the main requirements of reasonable compression level and high operation speed.

http://www.true-audio.com/

» WavPack

Open audio codec facilitating both loseless compression and a unique hybrid compression mode.

http://www.wavpack.com/