ATRAC: Adaptive Transform Acoustic Coding for MiniDisc: ATRAC is an audio format based on psychoacoustic principles originally used for Sony MiniDisc players.
GSM 06.10 Lossy Speech Compression Format: Details about the format and example source code.
high performance scalable audio coder: Introduction of an embedded audio coder(EAC), which outperforms MP3 and MPEG-4. Yet, the EAC compressed bitsteram is fully scalable in terms of compression ratio (coding bitrate), number of audio channels and audio sampling rate.
Lossless compression vs. speed: Comparisons of most popular lossless audio formats.
Rob Nowiks Audio Resource: Site contains discussion of audio formats, related audio algorithms and general audio production techniques.