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Glossary

Apple Lossless

(synonyms: ALAC)

Apple Lossless refers to the Apple Lossless Audio Codec, or ALAC. It was developed by Apple Inc. (then Apple Computer Inc.) for lossless compression of audio data. In contrast to MP3, OGG Vorbis, WMA and other lossy audio compression formats, lossless compression makes it possible to compress the audio data without losing any quality. The original track can be rebuilt from the lossless data. Other lossless audio compression formats include the Free Lossless Audio Codec (FLAC) and Monkey's Audio (APE).

Apple Lossless is currently supported by iTunes v.4.5 and up, after being introduced into QuickTime v6.5.1. All iPod players currently on the market support the Apple Lossless format, which is quick to decode and suitable for portable players. Apple Lossless data is stored in an MP4 container and uses the .m4a file extension. Currently, Apple Lossless is not subject to any Digital Rights Management (DRM) content protection system, but it is thought because of its use of the MP4 container, DRM could be easily added to the audio format.

Tests show that Apple Lossless compresses the original audio data to about 50 percent of its original size, as Apple claims. The level of compression depends on the data itself.

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Lossless AR ARccOS ARIA ARIB Artifact ASF Asian Silvers Aspect ratio ASPI ASV ASVOBS ASX ATA ATAPI ATI CrossFire ATIS ATRAC ATRAC Advanced Lossless ATRAC1 ATRAC3 ATRAC3plus ATSC Audio Frequency Modulation AUDIO_TS Authoring Automatic Fine Tuning Automatic Frequency Control Automatic Gain Control Automatic Iris Autoplay AVC AVCHD AVI AVS B B Frames B-CAS Back Surround Back Surround Channel BAE-VX1000 Bandwidth BayTSP BCA BD BD+ BD-25 BD-50 BD-J BD-Live BD-R BD-RE BD-ROM BDA BDAV BDMV BDRip Bescherming Rechten Entertainment Industrie Nederland Betacam BetaCrypt 1 BetaCrypt 2 BetaMax Betamax Case BFF Bidirectional Prediction Big Champagne BIN/CUE Images Bink Birefringence BISS Bitrate bitsetting Bitstream BitTorrent Blindread BlindWrite Bloatware Block Blocking Blu-Code Blu-ray Blu-ray Disc Blu-ray Disc Association Bluetooth 3.0 Bonus View Book A Book B Book C Book D Book E BookType Bootlegs Bots Bottom Field First BPI bps BREIN British Phonographic Industry British Phonographic Industry 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Conditional Access Module Conditional Access System Constant Bitrate Constant Quality Container Content Protection Technical Working Group Control Area Copy Guard Management System CoreAVC CoreAVC Video Codec CoreCrypt CorePNG CPPM CPRM CPSA CPTWG CRB CRIA Cropping CrossFire CrossFireX CRT Crypton Cryptoworks CSO CSS CTI-CAS Cue cue file Cue Sheet CVD D D-VHS D1 DAA DAE Daemon DAO DAR Darknet Dashboard DAT DAX DCC DCC Get DCC Send DCF DCT DCT Block DDC DDoS Decode Deep Color Deinterlace Delta Frame Demultiplexing Demux Descriptive Video Service DigiCipher 2 Digital Artifacts Digital Rights Management Digital Video Recorder Digital8 DiMA DIMM DIRAC Direct Access Archive Direct Stream Digital direct-to-video Direct2D Direct3D DirectDraw DirectInput DirectMusic DirectPlay DirectPlay Voice DirectSetup DirectShow DirectSound DirectSound3D DirectX DirectX Audio DirectX Graphics Infrastructure DirectX Media DirectX Media Object DiscJuggler Discrete Cosine Transform Discrete Surround Disk Copy 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