Audio Codes
Uncategorized June 14th. 2011, 4:54pmAudio Codes
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AudioCodes 300HD IP Phones Video Data Sheet
Audio Lossless Coding
Features
Support for PCM resolutions of up to 32-bit
Arbitrary sampling rates (tested up to 192 kHz, higher frequencies such as 384 kHz can be handled with the current specifications)
Multi-channel / multi-track support (up to 65536 channels)
Fast random access to any part of the encoded data.
Tagging
Streaming
Error correction mechanisms
Optional storage in MP4 file format
Can be multiplexed with video data using MP4 file format
An MPEG-4 Audio profile "ALS Simple Profile" is currently under development (as of 2009[update]).
Software support
As of 2006[update], there has not been wide acceptance of this format, possibly due to the lack of encoders and decoders available.
A reference implementation of MPEG-4 ALS encoder and decoder can be obtained at the MPEG-4 ALS homepage and it was also published as ISO/IEC 14496-5:2001/Amd 10:2007/Cor 3:2009.
There is a MPEG-4 ALS Decoder plugin for Winamp player.
On November 11, 2009, the FFmpeg open source project gained an MPEG-4 ALS decoder in its development version.
History
In July 2002, the Moving Picture Experts Group issued a call for proposals of lossless audio coding procedures to be sent in before December. Seven companies submitted their proposals which were examined taking into consideration compression efficiency, complexity and flexibility. By July 2003, Lossless Predictive Audio Compression (LPAC) was declared as the official draft for the future standard. The reference model was further developed under participation of the Technical University of Berlin (TUB), RealNetworks, and Nippon Telegraph and Telephone (NTT).
See also
Lossless Predictive Audio Compression (predecessor)
Lossless Transform Audio Compression (pre-predecessor)
MPEG-4 SLS (MPEG-4 Scalable Lossless Coding)
MPEG-4
References
^ ISO (2006). "Audio Lossless Coding (ALS), new audio profiles and BSAC extensions - ISO/IEC 14496-3:2005/Amd 2:2006". ISO. http://www.iso.org/iso/iso_catalogue/catalogue_ics/catalogue_detail_ics.htm?csnumber=43026. Retrieved 2009-10-07.
^ a b c d Communication Systems Group (2009-10-01). "MPEG-4 Audio Lossless Coding (ALS)". Technische Universitt Berlin. http://www.nue.tu-berlin.de/menue/forschung/projekte/beendete_projekte/mpeg-4_audio_lossless_coding_als/parameter/en/. Retrieved 2009-10-08.
^ Tilman Liebchen: Technical Universifty of Berlin, T. Moriya, N. Harada, Y. Kamamoto: NTT Communication Science Labs; Y. Reznik: RealNetworks Inc. (2005-08-03). "The MPEG-4 Audio Lossless Coding (ALS) Standard - Technology and Applications" (PDF). Technical Universifty of Berlin. http://elvera.nue.tu-berlin.de/files/0737Liebchen2005.pdf. Retrieved 2009-10-08.
^ a b Noboru Harada, Takehiro Moriya, and Yutaka Kamamoto (2009-05-07). "MPEG-4 ALS: Performance, Applications, and Related Standardization Activities". NTT Technical Review. https://www.ntt-review.jp/archive/ntttechnical.php?contents=ntr200712sp3.html. Retrieved 2009-10-08.
^ a b Hydrogenaudio Knowledgebase (2006). "Lossless comparison - Comparison Table". Hydrogenaudio Knowledgebase. http://wiki.hydrogenaudio.org/index.php?title=Lossless_comparison#Comparison_Table. Retrieved 2009-10-08.
^ ISO/IEC JTC1/SC29/WG11 (2009-07-03) (DOC), ISO/IEC 14496-3:200X/PDAM 2 ALS Simple Profile and Transport of SAOC - N10826, http://www.itscj.ipsj.or.jp/sc29/open/29view/29n10483t.doc, retrieved 2009-10-15
^ "MPEG-4 ALS Decoder plugin 1.00 for Winamp". Codecs.com. 2007-06-05. http://www.free-codecs.com/download/MPEG4_ALS_Decoder_plugin_for_Winamp.htm. Retrieved 2009-10-08.
^ FFmpeg (2009-11-11). "FFmpeg-cvslog r20517". FFmpeg. http://lists.mplayerhq.hu/pipermail/ffmpeg-cvslog/2009-November/025367.html. Retrieved 2009-11-20.
External links
MPEG-4 ALS homepage - Technical University Berlin, old homepage - dead link
MPEG-4 Audio Lossless Coding (ALS) - MultimediaWiki
MPEG-4 ALS: Performance, Applications, and Related Standardization Activities - NTT (2007)
Announcement on ACN Newswire
Technical specifications (ISO/IEC 14496-3:2005/Amd 2:2006)
Official MPEG web site
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Multimedia compression formats
Video compression
ISO/IEC
MJPEG Motion JPEG 2000 MPEG-1 MPEG-2 (Part 2) MPEG-4 (Part 2/ASP Part 10/AVC) HVC
ITU-T
H.120 H.261 H.262 H.263 H.264 H.265
Others
AMV AVS Bink CineForm Cinepak Dirac DV Indeo OMS Video Pixlet RealVideo RTVideo SheerVideo Smacker Sorenson Video Theora VC-1 VP6 VP7 VP8 WMV XVD
Audio compression
ISO/IEC
MPEG-1 Layer III (MP3) MPEG-1 Layer II MPEG-1 Layer I AAC HE-AAC MPEG-4 ALS MPEG-4 SLS MPEG-4 DST
ITU-T
G.711 G.718 G.719 G.722 G.722.1 G.722.2 G.723 G.723.1 G.726 G.728 G.729 G.729.1
Others
AC3 AMR AMR-WB AMR-WB+ Apple Lossless ATRAC DRA FLAC GSM-FR GSM-EFR iLBC Monkey's Audio -law Musepack Nellymoser OptimFROG RealAudio RTAudio SHN SILK Siren Speex TwinVQ Vorbis WavPack WMA True Audio
Image compression
ISO/IEC/ITU-T
JPEG JPEG 2000 JPEG XR lossless JPEG JBIG JBIG2 PNG WBMP
Others
APNG BMP DjVu EXR GIF ICER ILBM MNG PCX PGF TGA TIFF
Media containers
General
3GP ASF AVI Bink DMF DPX EVO FLV GXF M2TS Matroska MPEG-PS MPEG-TS MP4 MXF Ogg QuickTime RealMedia RIFF Smacker VOB
Audio only
AIFF AU WAV
See Compression methods for methods and Compression software implementations for codecs
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