Multimedia Audio Codecs
This page discusses the technical details of a variety of production audio
- Simple Time Domain Audio Coding [HTML],
[LyX]: This document covers a range of simple
time domain (as opposed to frequency domain) coding formats including PCM,
DPCM, and ADPCM.
- MPEG Audio: Here are links to Masters theses that deal with decoding MPEG I
Layer III (MP3) audio. Both explain the underlying concepts and principles of
the algorithm and include well-commented reference implementations.
- GSM 06.10:
- A/52 / AC-3
(PDF File): This
document describes the official A/52 algorithm, a.k.a. AC-3.
- Vorbis Audio: This
is a link to a detailed technical explanation of the open sourcec Vorbis audio
- Free Lossless Audio
Compression (FLAC): This site describes the format of the FLAC, which, as
the name implies, is a compression system that losslessly encodes audio, and
is also free (and open source).
- Meridian Lossless Packing (PDF File): This is
a paper that discusses the principles behind Meridian Lossless
Packing (MLP) used on DVD-audio discs.
- Overview of
Advanced Audio Coding (AAC): This Wiki page details the basic concepts
and capabilites of the AAC standard.
Analysis (QDMC/QDM2) (PDF file): This is a link to a PDF file that investigates
the inner workings of the QDesign music codec used in many Apple Quicktime
- ATRAC3 High-Quality
Audio Encoding Technology (PDF file): Brief whitepaper describing
the inner workings of Sony's Adaptive Transform Acoustic Coding 3 format.