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Statements

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dbr:Audio_Lossless_Coding
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Audio Lossless Coding
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MPEG-4 Audio Lossless Coding, also known as MPEG-4 ALS, is an extension to the MPEG-4 Part 3 audio standard to allow lossless audio compression. The extension was finalized in December 2005 and published as ISO/IEC 14496-3:2005/Amd 2:2006 in 2006. The latest description of MPEG-4 ALS was published as subpart 11 of the MPEG-4 Audio standard (ISO/IEC 14496-3:2019) (5th edition) in December 2019.
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dbr:International_Organization_for_Standardization dbr:MPEG-4_SLS dbr:Data_compression dbr:Open-source_software dbr:Pulse-code_modulation dbr:Lossless_Transform_Audio_Compression dbr:Linear_predictive_coding dbr:Lossless_compression dbr:Moving_Picture_Experts_Group dbr:Lossless_predictive_audio_compression dbr:Winamp dbr:MPEG-4 dbr:Technical_University_of_Berlin dbr:International_Electrotechnical_Commission dbr:FFmpeg dbr:Streaming_media dbc:MPEG-4 dbc:Lossless_audio_codecs dbr:FLAC dbr:RealNetworks dbr:Nippon_Telegraph_and_Telephone dbr:Reference_implementation dbr:Golomb_coding dbr:MPEG-4_Part_14 dbr:Audio_file_format dbr:Block_Gilbert_Moore_Coding dbr:MPEG-4_Part_3
dbo:abstract
MPEG-4 Audio Lossless Coding, also known as MPEG-4 ALS, is an extension to the MPEG-4 Part 3 audio standard to allow lossless audio compression. The extension was finalized in December 2005 and published as ISO/IEC 14496-3:2005/Amd 2:2006 in 2006. The latest description of MPEG-4 ALS was published as subpart 11 of the MPEG-4 Audio standard (ISO/IEC 14496-3:2019) (5th edition) in December 2019. MPEG-4 ALS combines together a short-term predictor and a long term predictor. The short-term predictor is similar to FLAC in its operation - it is a quantized LPC predictor with a losslessly coded residual using Golomb Rice Coding or (BGMC). The long term predictor is modeled by 5 long-term weighted residues, each with its own lag (delay). The lag can be hundreds of samples. This predictor improves the compression for sounds with rich harmonics (containing multiples of a single fundamental frequency, locked in phase) present in many musical instruments and human voice.
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