Audio coding format

audio codingaudio coding standardaudio compression formataudio coding standardsaudio coding formatsaudio coding systemsaudio compressionaudio compression codecaudio formataudio layer
An audio coding format (or sometimes audio compression format) is a content representation format for storage or transmission of digital audio (such as in digital television, digital radio and in audio and video files).wikipedia
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Advanced Audio Coding

AACAAC-LCMPEG-4 AAC
Examples of audio coding formats include MP3, AAC, Vorbis, FLAC, and Opus. As such, the user normally doesn't have a raw AAC file, but instead has a .m4a audio file, which is a MPEG-4 Part 14 container containing AAC-encoded audio. The most widely used audio coding formats are MP3 and Advanced Audio Coding (AAC), both of which are lossy formats based on modified discrete cosine transform (MDCT) and perceptual coding algorithms. The MDCT is used by modern audio compression formats such as Dolby Digital, MP3, and Advanced Audio Coding (AAC).
Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression.

Digital radio

digitaldigital transmissionradio
An audio coding format (or sometimes audio compression format) is a content representation format for storage or transmission of digital audio (such as in digital television, digital radio and in audio and video files).
In digital broadcasting systems, the analog audio signal is digitized, compressed using an audio coding format such as AAC+ (MDCT) or MP2, and transmitted using a digital modulation scheme.

Vorbis

Ogg VorbisOGGaoTuV
Examples of audio coding formats include MP3, AAC, Vorbis, FLAC, and Opus.
The project produces an audio coding format and software reference encoder/decoder (codec) for lossy audio compression.

Audio codec

audio codecscodecaudio
A specific software or hardware implementation capable of audio compression and decompression to/from a specific audio coding format is called an audio codec; an example of an audio codec is LAME, which is one of several different codecs which implements encoding and decoding audio in the MP3 audio coding format in software.
In software, an audio codec is a computer program implementing an algorithm that compresses and decompresses digital audio data according to a given audio file or streaming media audio coding format.

Audio file format

audioaudio fileaudio files
As such, the user normally doesn't have a raw AAC file, but instead has a .m4a audio file, which is a MPEG-4 Part 14 container containing AAC-encoded audio.
The bit layout of the audio data (excluding metadata) is called the audio coding format and can be uncompressed, or compressed to reduce the file size, often using lossy compression.

Content format

formatcontent representation formatformats
An audio coding format (or sometimes audio compression format) is a content representation format for storage or transmission of digital audio (such as in digital television, digital radio and in audio and video files).

Video coding format

video coding standardsvideo codingvideo coding standard
In video files with audio, the encoded audio content is bundled with video (in a video coding format) inside a multimedia container format.
Video content encoded using a particular video coding format is normally bundled with an audio stream (encoded using an audio coding format) inside a multimedia container format such as AVI, MP4, FLV, RealMedia, or Matroska.

Apple Lossless

ALACApple Lossless Audio Codec.m4a
Lossless audio coding formats such as FLAC and Apple Lossless are sometimes available, though at the cost of larger files.
Apple Lossless, also known as Apple Lossless Audio Codec (ALAC), or Apple Lossless Encoder (ALE), is an audio coding format, and its reference audio codec implementation, developed by Apple Inc. for lossless data compression of digital music.

Digital audio

digital musicdigitalaudio
An audio coding format (or sometimes audio compression format) is a content representation format for storage or transmission of digital audio (such as in digital television, digital radio and in audio and video files).
The MDCT is the basis for most audio coding standards, such as Dolby Digital (AC-3), MP3 (MPEG Layer III), Advanced Audio Coding (AAC), Windows Media Audio (WMA), and Vorbis (Ogg).

Modified discrete cosine transform

MDCTModulated Lapped Transformtime-domain aliasing cancellation
The most widely used audio coding formats are MP3 and Advanced Audio Coding (AAC), both of which are lossy formats based on modified discrete cosine transform (MDCT) and perceptual coding algorithms.
It is employed in most modern audio coding standards, including MP3, Dolby Digital (AC-3), Vorbis (Ogg), Windows Media Audio (WMA), ATRAC, Cook, Advanced Audio Coding (AAC), LDAC, Dolby AC-4, MPEG-H 3D Audio, as well as speech coding standards such as AAC-LD (LD-MDCT), G.722.1, G.729.1, CELT, and Opus.

Speech coding

speech encodingspeech codecSpeech
Perceptual coding was first used for speech coding compression, with linear predictive coding (LPC).
The techniques employed in speech coding are similar to those used in audio data compression and audio coding where knowledge in psychoacoustics is used to transmit only data that is relevant to the human auditory system.

MP3

.mp3MP3 downloadMP3 files
Examples of audio coding formats include MP3, AAC, Vorbis, FLAC, and Opus. A specific software or hardware implementation capable of audio compression and decompression to/from a specific audio coding format is called an audio codec; an example of an audio codec is LAME, which is one of several different codecs which implements encoding and decoding audio in the MP3 audio coding format in software. The most widely used audio coding formats are MP3 and Advanced Audio Coding (AAC), both of which are lossy formats based on modified discrete cosine transform (MDCT) and perceptual coding algorithms. The MDCT is used by modern audio compression formats such as Dolby Digital, MP3, and Advanced Audio Coding (AAC).
MP3 (formally MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) is a coding format for digital audio.

Dolby Digital

Dolby Digital 5.1AC3AC-3
The MDCT is used by modern audio compression formats such as Dolby Digital, MP3, and Advanced Audio Coding (AAC).
The main basis of the Dolby AC-3 multi-channel audio coding standard is the modified discrete cosine transform (MDCT), a lossy audio compression algorithm.

Opus (audio format)

OpusOpus audio format.opus
Examples of audio coding formats include MP3, AAC, Vorbis, FLAC, and Opus.
Opus is a lossy audio coding format developed by the Xiph.Org Foundation and standardized by the Internet Engineering Task Force, designed to efficiently code speech and general audio in a single format, while remaining low-latency enough for real-time interactive communication and low-complexity enough for low-end embedded processors.

Ogg

OGM.oggOgg Writ
The audio layer is most commonly provided by the music-oriented Vorbis format or its successor Opus.

MPEG-1 Audio Layer II

MP2MPEG-1 Layer IIMUSICAM
MPEG-1 Audio Layer II or MPEG-2 Audio Layer II (MP2, sometimes incorrectly called Musicam or MUSICAM) is a lossy audio compression format defined by ISO/IEC 11172-3 alongside MPEG-1 Audio Layer I and MPEG-1 Audio Layer III (MP3).

Adaptive Multi-Rate audio codec

AMRAMR-NBAdaptive Multi-Rate
The Adaptive Multi-Rate (AMR, AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding.

Speex

SPX.spxlibspeex
Speex is an audio compression codec specifically tuned for the reproduction of human speech and also a free software speech codec that may be used on VoIP applications and podcasts.

MPEG-4 Part 14

MP4M4A.mp4
As such, the user normally doesn't have a raw AAC file, but instead has a .m4a audio file, which is a MPEG-4 Part 14 container containing AAC-encoded audio.

FLAC

Free Lossless Audio Codec.flacFLAC
Examples of audio coding formats include MP3, AAC, Vorbis, FLAC, and Opus. Lossless audio coding formats such as FLAC and Apple Lossless are sometimes available, though at the cost of larger files.
FLAC (Free Lossless Audio Codec) is an audio coding format for lossless compression of digital audio, and is also the name of the free software project producing the FLAC tools, the reference software package that includes a codec implementation.

DTS (sound system)

DTSDatasat Digital 5.1DTS 5.1
DTS is related to the aptX audio coding format, and is based on the adaptive differential pulse-code modulation (ADPCM) audio data compression algorithm.

Windows Media Audio

WMAWMA LosslessWMA Pro
Windows Media Audio (WMA) is a series of audio codecs and their corresponding audio coding formats developed by Microsoft.

Comparison of audio coding formats

Comparison of audio formatsaudio
The following tables compare general and technical information for a variety of audio coding formats.

AAC-LD

AAC-ELDAAC LD
AAC-LD uses a version of the modified discrete cosine transform (MDCT) audio coding technique called the LD-MDCT.