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The MPEG-4 Low Delay Audio Coder (aka AAC Low Delay, or AAC-LD) is audio compression format designed to combine the advantages of perceptual audio coding with the low delay necessary for two-way communication. It is closely derived from the MPEG-2 Advanced Audio Coding (AAC) format. It was published in MPEG-4 Audio Version 2 (ISO/IEC 14496-3:1999/Amd 1:2000)[1][2][3][4][5] and in its later revisions.[6][7] Real time CODEC requirements The most stringent requirements are a maximum algorithmic delay of only 20 ms and a good audio quality for all kind of audio signals including speech and music. The AAC-LD coding scheme bridges the gap between speech coding schemes and high quality audio coding schemes. Two-way communication with AAC-LD is possible on usual analog telephone lines and via ISDN connections. It can use a bit rate of 32 - 64Kb/s or higher[8]. Compared to known speech coders, the codec is capable of coding both music and speech signals with good quality. Unlike speech coders, however, the achieved coding quality scales up with bitrate. Transparent quality can be achieved. AAC LD can also process stereo signals by using the advanced stereo coding tools of AAC. Thus it is possible to transmit a stereo signal with a bandwidth of 7 kHz via one ISDN line or with a bandwidth of 15 kHz via two ISDN lines. See also Advanced Audio Coding (parent technology) CELT an alternative codec for similar applications with lower delay and no licensing costs MP3 (related older technology) G.729 (ITU-T's teleconferencing audio codec) Ultra Low Delay Audio Coder ULD Audio codec (alternative technology also developed by Fraunhofer) References ^ ISO (2000). "ISO/IEC 14496-3:1999/Amd 1:2000 - Audio extensions". ISO. http://www.iso.org/iso/iso_catalogue/catalogue_ics/catalogue_detail_ics.htm?csnumber=31568. Retrieved 2009-10-07.  ^ ISO/IEC JTC 1/SC 29/WG 11 (1999-07) (PDF), ISO/IEC 14496-3:/Amd.1 - Final Committee Draft - MPEG-4 Audio Version 2, ftp://ftp.tnt.uni-hannover.de/pub/MPEG/audio/mpeg4/documents/w2803/w2803_n.pdf, retrieved 2009-10-07  ^ Heiko Purnhagen (2000-02-19). "AES 108th Convention: MPEG-4 Version 2 Audio ­ What is it about?". Heiko Purnhagen. http://140.130.175.70/html/mpeg4/sound.media.mit.edu/mpeg4/audio/general/index.html#aes108. Retrieved 2009-10-07. [dead link] ^ Jurgen Herre, Fraunhofer Institut for Integrated Circuits (2000-03-08) (PDF), MPEG-4 Low Delay Audio Coding, http://andrew.csie.ncyu.edu.tw/html/mpeg4/sound.media.mit.edu/mpeg4/audio/general/aes108_4-LowDelay.pdf, retrieved 2009-10-07 [dead link] ^ Heiko Purnhagen (2001-11-07). "The MPEG Audio Web Page - MPEG-4 Audio (ISO/IEC 14496-3)". http://140.130.175.70/html/mpeg4/sound.media.mit.edu/mpeg4/audio/index.html#mpeg4. Retrieved 2009-10-07. [dead link] ^ ISO (2007). "Low delay AAC profile - ISO/IEC 14496-3:2005/Amd 1:2007". ISO. http://www.iso.org/iso/catalogue_detail.htm?csnumber=43025. Retrieved 2009-10-07.  ^ ISO (2001). "ISO/IEC 14496-3:2001 - Information technology -- Coding of audio-visual objects -- Part 3: Audio". ISO. http://www.iso.org/iso/iso_catalogue/catalogue_ics/catalogue_detail_ics.htm?csnumber=36083. Retrieved 2009-10-07.  ^ http://www.iis.fraunhofer.de/en/bf/amm/produkte/audiocodec/audiocodecs/aaceld/index.jsp v · d · eMultimedia compression and container formats Video ISO/IEC MJPEG · Motion JPEG 2000 · MPEG-1 · MPEG-2 (Part 2) · MPEG-4 (Part 2/ASP · Part 10/AVC) · HEVC ITU-T H.120 · H.261 · H.262 · H.263 · H.264 · HEVC Others AVS · Bink · CineForm · Cinepak · Dirac · DV · Indeo · Microsoft Video 1 · OMS Video · Pixlet · RealVideo · RTVideo · SheerVideo · Smacker · Sorenson Video, Spark · Theora · VC-1 · VC-2 · VC-3 · VP3 · VP6 · VP7 · VP8 · WMV Audio ISO/IEC MPEG-1 Layer III (MP3) · MPEG-1 Layer II (Multichannel) · MPEG-1 Layer I · AAC · HE-AAC · MPEG Surround · MPEG-4 ALS · MPEG-4 SLS · MPEG-4 DST · MPEG-4 HVXC · MPEG-4 CELP 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 AC-3 · AMR · AMR-WB · AMR-WB+ · Apple Lossless · ATRAC · CELT · DRA · DTS · EVRC · EVRC-B · FLAC · GSM-HR · GSM-FR · GSM-EFR · iLBC · iSAC · Monkey's Audio · TTA (True Audio) · MT9 · A-law · μ-law · Musepack · Nellymoser · OptimFROG · OSQ · QCELP · RealAudio · RTAudio · SD2 · SHN · SILK · Siren · SMV · Speex · SVOPC · TwinVQ · VMR-WB · Vorbis · WavPack · WMA Image ISO/IEC/ITU-T JPEG · JPEG 2000 · JPEG XR · lossless JPEG · JBIG · JBIG2 · PNG · TIFF/EP · TIFF/IT Others APNG · BMP · DjVu · EXR · GIF · ICER · ILBM · MNG · PCX · PGF · TGA · QTVR · TIFF · WBMP · WebP Containers ISO/IEC MPEG-PS · MPEG-TS · ISO base media file format · MPEG-4 Part 14 · Motion JPEG 2000 · MPEG-21 Part 9 ITU-T H.222.0 · T.802 Others 3GP and 3G2 · AMV · ASF · AIFF · AVI · AU · Bink · DivX Media Format · DPX · EVO · Flash Video · GXF · M2TS · Matroska · MXF · Ogg · QuickTime File Format · RealMedia · REDCODE RAW · RIFF · Smacker · MOD and TOD · VOB · WAV · WebM See Compression methods for methods and Compression software implementations for codecs