Contents 1 Versions 2 Subparts 3 MPEG-4 Audio Object Types 4 Audio Profiles 5 Audio storage and transport 6 Bifurcation in the AAC technical standard 7 HE-AAC 8 AAC-SSR 8.1 Why AAC-SSR was introduced 9 BSAC 10 Licensing 11 See also 12 References 13 External links


Versions[edit] MPEG-4 Audio versions and editions[12] Edition Release date Latest amendment Standard Description First edition 1999 2001 ISO/IEC 14496-3:1999[2] also known as "MPEG-4 Audio Version 1" 2000 ISO/IEC 14496-3:1999/Amd 1:2000[13] also known as "MPEG-4 Audio Version 2", an Amendment to first edition[7][8] Second edition 2001 2005 ISO/IEC 14496-3:2001[14] Third edition 2005 2008 ISO/IEC 14496-3:2005[15] Fourth edition 2009 2015 and under development[12] ISO/IEC 14496-3:2009[1][16]


Subparts[edit] MPEG-4 Part 3 contains following subparts:[16] Subpart 1: Main (list of Audio Object Types, Profiles, Levels, interface to ISO/IEC 14496-1, MPEG-4 Audio transport stream, etc.) Subpart 2: Speech coding – HVXC (Harmonic Vector eXcitation Coding) Subpart 3: Speech coding – CELP (Code Excited Linear Prediction) Subpart 4: General Audio Coding (GA) (Time/Frequency Coding) – AAC, TwinVQ, BSAC Subpart 5: Structured Audio (SA) Subpart 6: Text to Speech Interface (TTSI) Subpart 7: Parametric Audio Coding – HILN (Harmonic and Individual Line plus Noise) Subpart 8: Technical description of parametric coding for high quality audio (SSC, Parametric Stereo) Subpart 9: MPEG-1/MPEG-2 Audio in MPEG-4 Subpart 10: Technical description of lossless coding of oversampled audio (MPEG-4 DST – Direct Stream Transfer) Subpart 11: Audio Lossless Coding (ALS) Subpart 12: Scalable Lossless Coding (SLS)


MPEG-4 Audio Object Types[edit] MPEG-4 Audio includes a system for handling a diverse group of audio formats in a uniform manner. Each format is assigned a unique Audio Object Type to represent it.[17][18] Object Type is used to distinguish between different coding methods. It directly determines the MPEG-4 tool subset required to decode a specific object. The MPEG-4 profiles are based on the object types and each profile supports different list of object types.[18] MPEG-4 Audio Object Types[7][9][17][19][20] Object Type ID Audio Object Type First public release date Description 1 AAC Main 1999 contains AAC LC 2 AAC LC (Low Complexity) 1999 Used in the "AAC Profile". MPEG-4 AAC LC Audio Object Type is based on the MPEG-2 Part 7 Low Complexity profile (LC) combined with Perceptual Noise Substitution (PNS) (defined in MPEG-4 Part 3 Subpart 4).[4][21] 3 AAC SSR (Scalable Sample Rate) 1999 MPEG-4 AAC SSR Audio Object Type is based on the MPEG-2 Part 7 Scalable Sampling Rate profile (SSR) combined with Perceptual Noise Substitution (PNS) (defined in MPEG-4 Part 3 Subpart 4).[4][21] 4 AAC LTP (Long Term Prediction) 1999 contains AAC LC 5 SBR (Spectral Band Replication) 2003[22] used with AAC LC in the "High Efficiency AAC Profile" (HE-AAC v1) 6 AAC Scalable 1999 7 TwinVQ 1999 audio coding at very low bitrates 8 CELP (Code Excited Linear Prediction) 1999 speech coding 9 HVXC (Harmonic Vector eXcitation Coding) 1999 speech coding 10 (Reserved) 11 (Reserved) 12 TTSI (Text-To-Speech Interface) 1999 13 Main synthesis 1999 contains 'wavetable' sample-based synthesis[23] and Algorithmic Synthesis and Audio Effects 14 'wavetable' sample-based synthesis 1999 based on SoundFont and DownLoadable Sounds,[23] contains General MIDI 15 General MIDI 1999 16 Algorithmic Synthesis and Audio Effects 1999 17 ER AAC LC 2000 Error Resilient 18 (Reserved ) 19 ER AAC LTP 2000 Error Resilient 20 ER AAC Scalable 2000 Error Resilient 21 ER TwinVQ 2000 Error Resilient 22 ER BSAC (Bit-Sliced Arithmetic Coding) 2000 It is also known as "Fine Granule Audio" or fine grain scalability tool. It is used in combination with the AAC coding tools and replaces the noiseless coding and the bitstream formatting of MPEG-4 Version 1 GA coder. Error Resilient 23 ER AAC LD (Low Delay) 2000 Error Resilient, used with CELP, ER CELP, HVXC, ER HVXC and TTSI in the "Low Delay Profile", (commonly used for real-time conversation applications) 24 ER CELP 2000 Error Resilient 25 ER HVXC 2000 Error Resilient 26 ER HILN (Harmonic and Individual Lines plus Noise) 2000 Error Resilient 27 ER Parametric 2000 Error Resilient 28 SSC (SinuSoidal Coding) 2004[24][25] 29 PS (Parametric Stereo) 2004[26] and 2006[27][28] used with AAC LC and SBR in the "HE-AAC v2 Profile". PS coding tool was defined in 2004 and Object Type defined in 2006. 30 MPEG Surround 2007[29] also known as MPEG Spatial Audio Coding (SAC), it is a type of spatial audio coding[30][31] (MPEG Surround was also defined in ISO/IEC 23003-1 in 2007[32]) 31 (Reserved) 32 MPEG-1/2 Layer-1 2005[33] 33 MPEG-1/2 Layer-2 2005[33] 34 MPEG-1/2 Layer-3 2005[33] also known as "MP3onMP4" 35 DST (Direct Stream Transfer) 2005[34] lossless audio coding, used on Super Audio CD 36 ALS (Audio Lossless Coding) 2006[28] lossless audio coding 37 SLS (Scalable Lossless Coding) 2006[35] two-layer audio coding with lossless layer and lossy General Audio core/layer (e.g. AAC) 38 SLS non-core 2006 lossless audio coding without lossy General Audio core/layer (e.g. AAC) 39 ER AAC ELD (Enhanced Low Delay) 2008[36] Error Resilient 40 SMR (Symbolic Music Representation) Simple 2008 note: Symbolic Music Representation is also the MPEG-4 Part 23 standard (ISO/IEC 14496-23:2008)[37][38] 41 SMR Main 2008 42 USAC (Unified Speech and Audio Coding) (no SBR) 2012[39] 43 SAOC (Spatial Audio Object Coding) 2010[40][41] note: Spatial Audio Object Coding is also the MPEG-D Part 2 standard (ISO/IEC 23003-2:2010)[42] 44 LD MPEG Surround 2010[40][43] This object type conveys Low Delay MPEG Surround Coding side information (that was defined in MPEG-D Part 2 – ISO/IEC 23003-2[42]) in the MPEG-4 Audio framework.[44] 45 USAC[45] 2012[46] (it will be also defined in MPEG-D Part 3 – ISO/IEC 23003-3[47])


Audio Profiles[edit] Hierarchical structure of AAC Profile, HE-AAC Profile and HE-AAC v2 Profile, and compatibility between them. The HE-AAC Profile decoder is fully capable of decoding any AAC Profile stream. Similarly the HE-AAC v2 decoder can handle all HE-AAC Profile streams as well as all AAC Profile streams. Based on the MPEG-4 Part 3 technical specification.[20] The MPEG-4 Audio standard defines several profiles. These profiles are based on the object types and each profile supports different list of object types. Each profile may also have several levels, which limit some parameters of the tools present in a profile. These parameters usually are the sampling rate and the number of audio channels decoded at the same time. MPEG-4 Audio Profiles[18][20] Audio Profile Audio Object Types First public release date AAC Profile AAC LC 2003 High Efficiency AAC Profile AAC LC, SBR 2003 HE-AAC v2 Profile AAC LC, SBR, PS 2006 Main Audio Profile AAC Main, AAC LC, AAC SSR, AAC LTP, AAC Scalable, TwinVQ, CELP, HVXC, TTSI, Main synthesis 1999 Scalable Audio Profile AAC LC, AAC LTP, AAC Scalable, TwinVQ, CELP, HVXC, TTSI 1999 Speech Audio Profile CELP, HVXC, TTSI 1999 Synthetic Audio Profile TTSI, Main synthesis 1999 High Quality Audio Profile AAC LC, AAC LTP, AAC Scalable, CELP, ER AAC LC, ER AAC LTP, ER AAC Scalable, ER CELP 2000 Low Delay Audio Profile CELP, HVXC, TTSI, ER AAC LD, ER CELP, ER HVXC 2000 Natural Audio Profile AAC Main, AAC LC, AAC SSR, AAC LTP, AAC Scalable, TwinVQ, CELP, HVXC, TTSI, ER AAC LC, ER AAC LTP, ER AAC Scalable, ER TwinVQ, ER BSAC, ER AAC LD, ER CELP, ER HVXC, ER HILN, ER Parametric 2000 Mobile Audio Internetworking Profile ER AAC LC, ER AAC Scalable, ER TwinVQ, ER BSAC, ER AAC LD 2000 HD-AAC Profile AAC LC, SLS[48] 2009[49] ALS Simple Profile ALS 2010[41][50]


Audio storage and transport[edit] Multiplex, storage and transmission formats for MPEG-4 Audio[16] Standard Description Multiplex ISO/IEC 14496-1 MPEG-4 Multiplex scheme (M4Mux)[51] Multiplex ISO/IEC 14496-3 Low Overhead Audio Transport Multiplex (LATM) Storage ISO/IEC 14496-3 (informative) Audio Data Interchange Format (ADIF) – only for AAC Storage ISO/IEC 14496-12 MPEG-4 file format (MP4) / ISO base media file format Transmission ISO/IEC 14496-3 (informative) Audio Data Transport Stream (ADTS) – only for AAC Transmission ISO/IEC 14496-3 Low Overhead Audio Stream (LOAS), based on LATM There is no standard for transport of elementary streams over a channel, because the broad range of MPEG-4 applications have delivery requirements that are too wide to easily characterize with a single solution. The capabilities of a transport layer and the communication between transport, multiplex, and demultiplex functions are described in the Delivery Multimedia Integration Framework (DMIF) in ISO/IEC 14496-6.[16] A wide variety of delivery mechanisms exist below this interface, e.g., MPEG transport stream, Real-time Transport Protocol (RTP), etc. Transport in Real-time Transport Protocol is defined in RFC 3016 (RTP Payload Format for MPEG-4 Audio/Visual Streams), RFC 3640 (RTP Payload Format for Transport of MPEG-4 Elementary Streams), RFC 4281 (The Codecs Parameter for "Bucket" Media Types) and RFC 4337 (MIME Type Registration for MPEG-4). LATM and LOAS were defined for natural audio applications, which do not require sophisticated object-based coding or other functions provided by MPEG-4 Systems.


Bifurcation in the AAC technical standard[edit] Main article: Advanced Audio Coding The Advanced Audio Coding in MPEG-4 Part 3 (MPEG-4 Audio) Subpart 4 was enhanced relative to the previous standard MPEG-2 Part 7 (Advanced Audio Coding), in order to provide better sound quality for a given encoding bitrate. It is assumed that any Part 3 and Part 7 differences will be ironed out by the ISO standards body in the near future to avoid the possibility of future bitstream incompatibilities. At present there are no known player or codec incompatibilities due to the newness of the standard. The MPEG-2 Part 7 standard (Advanced Audio Coding) was first published in 1997 and offers three default profiles:[52][53] Low Complexity profile (LC), Main profile and Scalable Sampling Rate profile (SSR). The MPEG-4 Part 3 Subpart 4 (General Audio Coding) combined the profiles from MPEG-2 Part 7 with Perceptual Noise Substitution (PNS) and defined them as Audio Object Types (AAC LC, AAC Main, AAC SSR).[4]


HE-AAC[edit] Main article: HE-AAC High-Efficiency Advanced Audio Coding is an extension of AAC LC using spectral band replication (SBR), and Parametric Stereo (PS). It is designed to increase coding efficiency at low bitrates by using partial parametric representation of audio.


AAC-SSR[edit] AAC Scalable Sample Rate was introduced by Sony to the MPEG-2 Part 7 and MPEG-4 Part 3 standards.[citation needed] It was first published in ISO/IEC 13818-7, Part 7: Advanced Audio Coding (AAC) in 1997.[52][53] The audio signal is first split into 4 bands using a 4 band polyphase quadrature filter bank. Then these 4 bands are further split using MDCTs with a size k of 32 or 256 samples. This is similar to normal AAC LC which uses MDCTs with a size k of 128 or 1024 directly on the audio signal. The advantage of this technique is that short block switching can be done separately for every PQF band. So high frequencies can be encoded using a short block to enhance temporal resolution, low frequencies can be still encoded with high spectral resolution. However, due to aliasing between the 4 PQF bands coding efficiencies around (1,2,3) * fs/8 is worse than normal MPEG-4 AAC LC.[citation needed] MPEG-4 AAC-SSR is very similar to ATRAC and ATRAC-3. Why AAC-SSR was introduced[edit] The idea behind AAC-SSR was not only the advantage listed above, but also the possibility of reducing the data rate by removing 1, 2 or 3 of the upper PQF bands. A very simple bitstream splitter can remove these bands and thus reduce the bitrate and sample rate. Example: 4 subbands: bitrate = 128 kbit/s, sample rate = 48 kHz, f_lowpass = 20 kHz 3 subbands: bitrate ~ 120 kbit/s, sample rate = 48 kHz, f_lowpass = 18 kHz 2 subbands: bitrate ~ 100 kbit/s, sample rate = 24 kHz, f_lowpass = 12 kHz 1 subband: bitrate ~ 65 kbit/s, sample rate = 12 kHz, f_lowpass = 6 kHz Note: although possible, the resulting quality is much worse than typical for this bitrate. So for normal 64 kbit/s AAC LC a bandwidth of 14–16 kHz is achieved by using intensity stereo and reduced NMRs. This degrades audible quality less than transmitting 6 kHz bandwidth with perfect quality.


BSAC[edit] Bit Sliced Arithmetic Coding is an MPEG-4 standard (ISO/IEC 14496-3 subpart 4) for scalable audio coding. BSAC uses an alternative noiseless coding to AAC, with the rest of the processing being identical to AAC. This support for scalability allows for nearly transparent sound quality at 64 kbit/s and graceful degradation at lower bit rates. BSAC coding is best performed in the range of 40 kbit/s to 64 kbit/s, though it operates in the range of 16 kbit/s to 64 kbit/s. The AAC-BSAC codec is used in Digital Multimedia Broadcasting (DMB) applications.


Licensing[edit] In 2002, the MPEG-4 Audio Licensing Committee selected the Via Licensing Corporation as the Licensing Administrator for the MPEG-4 Audio patent pool.[3][54][55]


See also[edit] TwinVQ – one of the object types defined in MPEG-4 Audio version 1 MPEG-4 Part 2 MPEG-4 Part 14 container format (MP4) Digital rights management Advanced Audio Coding (AAC) ISO/IEC JTC 1/SC 29


References[edit] ^ a b ISO (2009). "ISO/IEC 14496-3:2009 - Information technology -- Coding of audio-visual objects -- Part 3: Audio". ISO. Retrieved 2009-10-06.  ^ a b ISO (1999). "ISO/IEC 14496-3:1999 - Information technology -- Coding of audio-visual objects -- Part 3: Audio". ISO. Retrieved 2009-10-06.  ^ a b Business Wire (2002-12-02). "MPEG-4 Audio Licensing Committee Selects Via Licensing Corporation as Administrator; MPEG-4 Audio Licensing Committee Finalizing Terms for Audio Profile Licensing". The Free Library. Retrieved 2009-10-06.  ^ a b c d Karlheinz Brandenburg; Oliver Kunz; Akihiko Sugiyama (1999). "MPEG-4 Natural Audio Coding – Audio profiles and levels". chiariglione.org. Archived from the original on 2010-07-17. Retrieved 2009-10-06.  ^ Karlheinz Brandenburg; Oliver Kunz; Akihiko Sugiyama. "MPEG-4 Natural Audio Coding – scalability in MPEG-4 natural audio". chiariglione.org. Archived from the original on 2010-02-28. Retrieved 2009-10-06.  ^ D. Thom, H. Purnhagen, and the MPEG Audio Subgroup (October 1998). "MPEG Audio FAQ Version 9 – MPEG-4". chiariglione.org. Retrieved 2009-10-06. CS1 maint: Multiple names: authors list (link) ^ a b c d ISO/IEC JTC 1/SC 29/WG 11 (July 1999), ISO/IEC 14496-3:/Amd.1 – Final Committee Draft – MPEG-4 Audio Version 2 (PDF), retrieved 2009-10-07  ^ a b Heiko Purnhagen (1999-06-07), An Overview of MPEG-4 Audio Version 2 (PDF), Heiko Purnhagen, retrieved 2009-10-07  ^ a b Heiko Purnhagen (2001-06-01). "The MPEG-4 Audio Standard: Overview and Applications". Heiko Purnhagen. Retrieved 2009-10-07. [dead link] ^ Heiko Purnhagen (2001-11-07). "The MPEG Audio Web Page – MPEG-4 Audio (ISO/IEC 14496-3)". Retrieved 2009-10-07. [dead link] ^ Rob Koenen, ISO/IEC JTC1/SC29/WG11 (March 2002). "Overview of the MPEG-4 Standard". chiariglione.org. Retrieved 2009-10-06.  ^ a b MPEG. "MPEG standards – Full list of standards developed or under development". chiariglione.org. Archived from the original on April 20, 2010. Retrieved 2009-10-31.  ^ ISO (2000). "ISO/IEC 14496-3:1999/Amd 1:2000 - Audio extensions". ISO. Retrieved 2009-10-07.  ^ ISO (2001). "ISO/IEC 14496-3:2001 - Information technology -- Coding of audio-visual objects -- Part 3: Audio". ISO. Retrieved 2009-10-14.  ^ ISO (2005). "ISO/IEC 14496-3:2005 - Information technology -- Coding of audio-visual objects -- Part 3: Audio". ISO. Retrieved 2009-10-14.  ^ a b c d ISO/IEC (2009-09-01), ISO/IEC 14496-3:2009 - Information technology -- Coding of audio-visual objects -- Part 3: Audio (PDF), IEC, retrieved 2009-10-07  ^ a b MultimediaWiki (2009). "MPEG-4 Audio". MultimediaWiki. Retrieved 2009-10-09.  ^ a b c Bernhard Grill; Stefan Geyersberger; Johannes Hilpert; Bodo Teichmann (July 2004), Implementation of MPEG-4 Audio Components on various Platforms (PDF), Fraunhofer Gesellschaft, archived from the original (PDF) on 2007-06-10, retrieved 2009-10-09  ^ ISO/IEC JTC1/SC29/WG11 N2203 (March 1998). "MPEG-4 Audio (Final Committee Draft 14496-3)". Heiko Purnhagen. Retrieved 2009-10-07. [dead link] ^ a b c ISO/IEC JTC1/SC29/WG11/N7016 (2005-01-11), Text of ISO/IEC 14496-3:2001/FPDAM 4, Audio Lossless Coding (ALS), new audio profiles and BSAC extensions, archived from the original (DOC) on 2014-05-12, retrieved 2009-10-09  ^ a b Karlheinz Brandenburg; Oliver Kunz; Akihiko Sugiyama (1999). "MPEG-4 Natural Audio Coding – General Audio Coding (AAC based)". chiariglione.org. Archived from the original on 2010-02-19. Retrieved 2009-10-06.  ^ ISO (2003). "Bandwidth extension, ISO/IEC 14496-3:2001/Amd 1:2003". ISO. Retrieved 2009-10-13.  ^ a b Scheirer, Eric D.; Ray, Lee (1998). "Algorithmic and Wavetable Synthesis in the MPEG-4 Multimedia Standard". Audio Engineering Society Convention 105, 1998. 2.2 Wavetable synthesis with SASBF: The SASBF wavetable-bank format had a somewhat complex history of development. The original specification was contributed by E-Mu Systems and was based on their "SoundFont" format [15]. After integration of this component in the MPEG-4 reference software was complete, the MIDI Manufacturers Association (MMA) approached MPEG requesting that MPEG-4 SASBF be compatible with their "Downloaded Sounds" format [13]. E-Mu agreed that this compatibility was desirable, and so a new format was negotiated and designed collaboratively by all parties.  ^ ISO (2004). "Parametric coding for high-quality audio, ISO/IEC 14496-3:2001/Amd 2:2004". ISO. Retrieved 2009-10-13.  ^ ISO/IEC JTC1/SC29/WG11 (2003-07-25). "Text of ISO/IEC 14496-3:2001/FPDAM2 (Parametric Audio) - N5713". Archived from the original (DOC) on 2014-05-12. Retrieved 2009-10-13.  ^ 3GPP (2004-09-30). "3GPP TS 26.401 V6.0.0 (2004-09), General Audio Codec audio processing functions; Enhanced aacPlus General Audio CodecGeneral Description (Release 6)" (DOC). 3GPP. Retrieved 2009-10-13.  ^ 3GPP (2005-01-04). "ETSI TS 126 401 V6.1.0 (2004-12) - Universal Mobile Telecommunications System (UMTS)General audio codec audio processing functions; Enhanced aacPlus general audio codecGeneral description (3GPP TS 26.401 version 6.1.0 Release 6)". 3GPP. Retrieved 2009-10-13.  ^ a b ISO (2006). "Audio Lossless Coding (ALS), new audio profiles and BSAC extensions, ISO/IEC 14496-3:2005/Amd 2:2006". ISO. Retrieved 2009-10-13.  ^ ISO (2007). "BSAC extensions and transport of MPEG Surround, ISO/IEC 14496-3:2005/Amd 5:2007". ISO. Retrieved 2009-10-13.  ^ ISO/IEC JTC1/SC29/WG11 (July 2005). "Tutorial on MPEG Surround Audio Coding". Retrieved 2010-02-09.  ^ ISO/IEC JTC1/SC29/WG11 (July 2005). "Tutorial on MPEG Surround Audio Coding". archive.org. Archived from the original on 2008-03-24. Retrieved 2010-02-09.  ^ ISO (2007-01-29). "ISO/IEC 23003-1:2007 - Information technology -- MPEG audio technologies -- Part 1: MPEG Surround". ISO. Retrieved 2009-10-24.  ^ a b c ISO (2005). "MPEG-1/2 audio in MPEG-4, ISO/IEC 14496-3:2001/Amd 3:2005". ISO. Retrieved 2009-10-13.  ^ ISO (2005). "Lossless coding of oversampled audio, ISO/IEC 14496-3:2001/Amd 6:2005". ISO. Retrieved 2009-10-13.  ^ ISO (2006). "Scalable Lossless Coding (SLS), ISO/IEC 14496-3:2005/Amd 3:2006". ISO. Retrieved 2009-10-13.  ^ ISO (2008). "Enhanced low delay AAC, ISO/IEC 14496-3:2005/Amd 9:2008". ISO. Retrieved 2009-10-13.  ^ ISO (2008). "ISO/IEC 14496-23:2008, Information technology -- Coding of audio-visual objects -- Part 23: Symbolic Music Representation". ISO. Retrieved 2009-10-13.  ^ ISO (2008). "Symbolic Music Representation conformance, ISO/IEC 14496-4:2004/Amd 29:2008". ISO. Retrieved 2009-10-13.  ^ ISO/IEC JTC 1/SC 29/WG 11 (April 2009). "89th WG11 meeting notice – Work plan and time line". Archived from the original on 2010-08-06. Retrieved 2009-10-13.  ^ a b ISO (2009). "ISO/IEC 14496-3:2009/Amd 2:2010, ALS simple profile and transport of SAOC". ISO. Retrieved 2009-10-13.  ^ a b ISO/IEC JTC1/SC29/WG11 (2009-07-03), ISO/IEC 14496-3:200X/PDAM 2 – ALS Simple Profile and Transport of SAOC , N10826, archived from the original (DOC) on 2014-07-29, retrieved 2009-10-13  ^ a b ISO (2010). "ISO/IEC 23003-2:2010 - Information technology -- MPEG audio technologies -- Part 2: Spatial Audio Object Coding (SAOC)". ISO. Retrieved 2010-12-27.  ^ AES Convention Paper 8099 – A new parametric stereo and Multi Channel Extension for MPEG-4 Enhanced Low Delay AAC (AAC-ELD) (PDF), archived from the original (PDF) on 2011-09-28, retrieved 2011-07-18  ^ ISO/IEC JTC1/SC29/WG11 (October 2009), ISO/IEC 14496-3:2009/FPDAM 2 – ALS simple profile and transport of SAOC , N11032, archived from the original (DOC) on 2014-07-29, retrieved 2009-12-30  ^ "Unified Speech and Audio Coding". Archived from the original on 2011-07-16. Retrieved 2010-06-08.  ^ "ISO/IEC 14496-3:2009/PDAM 3 - Transport of unified speech and audio coding (USAC)". 2011-06-30. Retrieved 2011-07-18.  ^ "ISO/IEC DIS 23003-3 – Information technology -- MPEG audio technologies -- Part 3: Unified speech and audio coding". 2011-02-15. Retrieved 2011-07-18.  ^ ISO/IEC JTC1/SC29/WG11 (2008-10-17), ISO/IEC 14496-3:2005/PDAM 10:200X HD-AAC profile, MPEG2008/N10188, archived from the original (DOC) on 2014-05-12, retrieved 2009-10-19  ^ ISO (2009-09-11). "ISO/IEC 14496-3:2009/Amd 1:2009 - HD-AAC profile and MPEG Surround signaling". ISO. Retrieved 2009-10-15.  ^ ISO (2009-10-08). "ISO/IEC 14496-3:2009/Amd 2:2010 - ALS simple profile and transport of SAOC". ISO. Retrieved 2009-10-15.  ^ ISO (2004-11-15), ISO/IEC 14496-1, Third edition 2004-11-15, Part 1: Systems (PDF), ISO, archived from the original (PDF) on June 14, 2011, retrieved 2009-10-14  ^ a b ISO (2004-10-15), ISO/IEC 13818-7, Third edition, Part 7 – Advanced Audio Coding (AAC) (PDF), p. 32, archived from the original (PDF) on 2011-07-13, retrieved 2009-10-19  ^ a b ISO (1997). "ISO/IEC 13818-7:1997, Information technology -- Generic coding of moving pictures and associated audio information -- Part 7: Advanced Audio Coding (AAC)". Retrieved 2009-10-19.  ^ Business Wire (2009-01-05). "Via Licensing Announces MPEG-4 SLS Patent Pool License". Reuters. Retrieved 2009-10-09.  ^ Via Licensing Corporation (2009-05-12). "Via Licensing Announces the Availability of an MPEG-4 SLS Joint Patent Licensing Program". Business Wire. Retrieved 2009-10-09. 


External links[edit] Apple: MPEG-4: AAC "HE-AAC" (VideoLAN WIKI) EBU subjective listening tests on low-bitrate audio codecs AAC radio stations – Online radio stations in AAC format Tuner2 – Directory of radio stations in AAC+ format at various bitrates RadioFeeds UK & Ireland – Page containing plenty of terrestrial stations webcasting in AAC+ format. [1] A page comparing codecs including He-AAC @64 kbit/s by listening tests. (Page is offline) Official MPEG web site RFC 3016 – RTP Payload Format for MPEG-4 Audio/Visual Streams RFC 3640 – RTP Payload Format for Transport of MPEG-4 Elementary Streams RFC 4281 – The Codecs Parameter for "Bucket" Media Types RFC 4337 – MIME Type Registration for MPEG-4 v t e Multimedia compression and container formats Video compression ISO/IEC MJPEG Motion JPEG 2000 MPEG-1 MPEG-2 Part 2 MPEG-4 Part 2/ASP Part 10/AVC MPEG-H Part 2/HEVC ITU-T H.120 H.261 H.262 H.263 H.264 H.265 SMPTE VC-1 VC-2 VC-3 VC-5 Alliance for Open Media AV1 Others Apple Video AVS Bink Cinepak Daala Dirac DV DVI FFV1 Huffyuv Indeo Lagarith Microsoft Video 1 MSU Lossless OMS Video Pixlet ProRes 422 ProRes 4444 QuickTime Animation Graphics RealVideo RTVideo SheerVideo Smacker Sorenson Video, Spark Theora Thor VP3 VP6 VP7 VP8 VP9 WMV XEB YULS Audio compression ISO/IEC MPEG-1 Layer III (MP3) MPEG-1 Layer II Multichannel MPEG-1 Layer I AAC HE-AAC AAC-LD MPEG Surround MPEG-4 ALS MPEG-4 SLS MPEG-4 DST MPEG-4 HVXC MPEG-4 CELP MPEG-D USAC MPEG-H 3D Audio ITU-T G.711 (A-law, µ-law) 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 IETF Opus iLBC 3GPP AMR AMR-WB AMR-WB+ EVRC EVRC-B EVS GSM-HR GSM-FR GSM-EFR Others ACELP AC-3 AC-4 ALAC Asao ATRAC CELT Codec2 DRA DTS FLAC iSAC Monkey's Audio TTA True Audio MT9 Musepack OptimFROG OSQ QCELP RCELP RealAudio RTAudio SD2 SHN SILK Siren SMV Speex SVOPC TwinVQ VMR-WB Vorbis VSELP WavPack WMA MQA aptX LDAC Image compression IEC, ISO, ITU-T, W3C, IETF CCITT Group 4 GIF HEIF HEVC JBIG JBIG2 JPEG JPEG 2000 JPEG XR Lossless JPEG PNG TIFF TIFF/EP TIFF/IT Others APNG BPG DjVu EXR FLIF ICER MNG PGF QTVR WBMP WebP Containers ISO/IEC MPEG-ES MPEG-PES MPEG-PS MPEG-TS ISO base media file format MPEG-4 Part 14 (MP4) Motion JPEG 2000 MPEG-21 Part 9 MPEG media transport ITU-T H.222.0 T.802 IETF RTP Others 3GP and 3G2 AMV ASF AIFF AVI AU BPG Bink Smacker BMP DivX Media Format EVO Flash Video GXF IFF M2TS Matroska WebM MXF Ogg QuickTime File Format RatDVD RealMedia RIFF WAV MOD and TOD VOB, IFO and BUP Collaborations NETVC MPEG-LA See Compression methods for methods and Compression software for codecs v t e MPEG (Moving Picture Experts Group) MPEG-1 2 3 4 7 21 A B C D E V M U H MPEG-1 Parts Part 1: Systems Program stream Part 2: Video based on H.261 Part 3: Audio Layer I Layer II Layer III MPEG-2 Parts Part 1: Systems (H.222.0) Transport stream Program stream Part 2: Video (H.262) Part 3: Audio Layer I Layer II Layer III MPEG Multichannel Part 6: DSM CC Part 7: Advanced Audio Coding MPEG-4 Parts Part 2: Video based on H.263 Part 3: Audio Part 6: DMIF Part 10: Advanced Video Coding (H.264) Part 11: Scene description Part 12: ISO base media file format Part 14: MP4 file format Part 17: Streaming text format Part 20: LASeR Part 22: Open Font Format MPEG-7 Parts Part 2: Description definition language MPEG-21 Parts Parts 2, 3 and 9: Digital Item Part 5: Rights Expression Language MPEG-D Parts Part 1: MPEG Surround Part 3: Unified Speech and Audio Coding MPEG-H Parts Part 1: MPEG media transport Part 2: High Efficiency Video Coding Part 3: MPEG-H 3D Audio Part 12: High Efficiency Image File Format Other MPEG-DASH Retrieved from "https://en.wikipedia.org/w/index.php?title=MPEG-4_Part_3&oldid=819684850" Categories: Audio codecsLossy compression algorithmsMPEG-4Hidden categories: CS1 maint: Multiple names: authors listAll articles with dead external linksArticles with dead external links from September 2010Articles with dead external links from June 2016All articles with unsourced statementsArticles with unsourced statements from October 2009Articles with unsourced statements from February 2013Pages using RFC magic links


Navigation menu Personal tools Not logged inTalkContributionsCreate accountLog in Namespaces ArticleTalk Variants Views ReadEditView history More Search Navigation Main pageContentsFeatured contentCurrent eventsRandom articleDonate to WikipediaWikipedia store Interaction HelpAbout WikipediaCommunity portalRecent changesContact page Tools What links hereRelated changesUpload fileSpecial pagesPermanent linkPage informationWikidata itemCite this page Print/export Create a bookDownload as PDFPrintable version Languages CatalàEspañolFrançais한국어日本語Yorùbá Edit links This page was last edited on 10 January 2018, at 19:12. Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. Privacy policy About Wikipedia Disclaimers Contact Wikipedia Developers Cookie statement Mobile view (window.RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgPageParseReport":{"limitreport":{"cputime":"0.540","walltime":"0.589","ppvisitednodes":{"value":3343,"limit":1000000},"ppgeneratednodes":{"value":0,"limit":1500000},"postexpandincludesize":{"value":189969,"limit":2097152},"templateargumentsize":{"value":2832,"limit":2097152},"expansiondepth":{"value":12,"limit":40},"expensivefunctioncount":{"value":4,"limit":500},"entityaccesscount":{"value":0,"limit":400},"timingprofile":["100.00% 458.624 1 -total"," 78.20% 358.635 1 Template:Reflist"," 45.97% 210.831 43 Template:Cite_web"," 13.15% 60.303 11 Template:Citation"," 10.55% 48.395 5 Template:Fix"," 9.06% 41.547 2 Template:Citation_needed"," 7.02% 32.215 10 Template:Category_handler"," 6.63% 30.415 6 Template:Navbox"," 5.64% 25.874 2 Template:Main"," 4.49% 20.583 1 Template:Compression_formats"]},"scribunto":{"limitreport-timeusage":{"value":"0.297","limit":"10.000"},"limitreport-memusage":{"value":4522308,"limit":52428800}},"cachereport":{"origin":"mw1272","timestamp":"20180113123109","ttl":1900800,"transientcontent":false}}});});(window.RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgBackendResponseTime":78,"wgHostname":"mw1240"});});


MPEG-4_Part_3 - Photos and All Basic Informations

MPEG-4_Part_3 More Links

International Organization For StandardizationInternational Electrotechnical CommissionInternational Organization For StandardizationInternational Electrotechnical CommissionMPEG-4Moving Picture Experts GroupAudio CodingLossy CompressionSpeech CodingHarmonic Vector Excitation CodingCELPAdvanced Audio CodingTwinVQLossless CompressionMPEG-4 SLSAudio Lossless CodingDirect Stream TransferText To SpeechMPEG-4 Structured AudioStructured Audio Orchestra LanguageMIDIHVXCCode Excited Linear PredictionAdvanced Audio CodingTwinVQMPEG-4 Structured AudioText To SpeechHarmonic And Individual Lines And NoiseParametric StereoMPEG-1MPEG-2Direct Stream TransferAudio Lossless CodingScalable Lossless CodingAAC-LCLong Term PredictionSpectral Band ReplicationHE-AACTwinVQCode Excited Linear PredictionHVXCText To SpeechTable-lookup SynthesisSample-based SynthesisTable-lookup SynthesisSample-based SynthesisSoundFontDownLoadable SoundsGeneral MIDIAdvanced Audio CodingAAC-LDHarmonic And Individual Lines And NoiseParametric StereoMPEG SurroundMP1MPEG-1 Audio Layer IIMP3Direct Stream TransferAudio Lossless CodingScalable Lossless CodingMPEG-4Unified Speech And Audio CodingMPEG-DEnlargeCELPHVXCMPEG-4 Part 14ISO Base Media File FormatElementary StreamDelivery Multimedia Integration FrameworkMPEG Transport StreamReal-time Transport ProtocolAdvanced Audio CodingAdvanced Audio CodingMPEG-2Sound QualityHE-AACHigh-Efficiency Advanced Audio CodingAdvanced Audio CodingSpectral Band ReplicationParametric StereoWikipedia:Citation NeededPolyphase Quadrature FilterModified Discrete Cosine TransformPQFWikipedia:Citation NeededATRACATRAC-3Graceful DegradationDigital Multimedia BroadcastingPatent PoolTwinVQMPEG-4 Part 2MPEG-4 Part 14Digital Rights ManagementAdvanced Audio CodingISO/IEC JTC 1/SC 29International Organization For StandardizationInternational Organization For StandardizationCategory:CS1 Maint: Multiple Names: Authors ListInternational Organization For StandardizationInternational Electrotechnical CommissionWikipedia:Link RotWikipedia:Link RotInternational Organization For StandardizationInternational Organization For StandardizationInternational Organization For StandardizationInternational Organization For StandardizationInternational Electrotechnical CommissionWikipedia:Link RotTemplate:Compression FormatsTemplate Talk:Compression FormatsMultimediaData CompressionDigital Container FormatData CompressionInternational Organization For StandardizationInternational Electrotechnical CommissionMotion JPEGMotion JPEG 2000MPEG-1MPEG-2H.262/MPEG-2 Part 2MPEG-4MPEG-4 Part 2H.264/MPEG-4 AVCMPEG-HHigh Efficiency Video CodingITU-TH.120H.261H.262/MPEG-2 Part 2H.263H.264/MPEG-4 AVCHigh Efficiency Video CodingSociety Of Motion Picture And Television EngineersVC-1Dirac (video Compression Format)DNxHD CodecCineFormAlliance For Open MediaAOMedia Video 1Apple VideoAudio Video StandardBink VideoCinepakDaalaDirac (video Compression Format)DVDigital Video InteractiveFFV1HuffyuvIndeoLagarithMicrosoft Video 1MSU Lossless Video CodecOMS VideoPixletProRes 422ProRes 4444QuickTime AnimationQuickTime GraphicsRealVideoRTVideoSheerVideoSmacker VideoSorenson CodecTheoraThor (video Codec)VP3VP6VP7VP8VP9Windows Media Video (video Compression Format)RatDVDYULSData CompressionInternational Organization For StandardizationInternational Electrotechnical CommissionMP3MPEG-1 Audio Layer IIMPEG MultichannelMPEG-1 Audio Layer IAdvanced Audio CodingHigh-Efficiency Advanced Audio CodingAAC-LDMPEG SurroundAudio Lossless CodingMPEG-4 SLSSuper Audio CDHarmonic Vector Excitation CodingCode-excited Linear PredictionUnified Speech And Audio CodingMPEG-H 3D AudioITU-TG.711A-law AlgorithmΜ-law AlgorithmG.718G.719G.722G.722.1Adaptive Multi-Rate WidebandG.723G.723.1G.726G.728G.729G.729.1IETFOpus (audio Format)Internet Low Bitrate Codec3GPPAdaptive Multi-Rate Audio CodecAdaptive Multi-Rate WidebandExtended Adaptive Multi-Rate – WidebandEnhanced Variable Rate CodecEnhanced Variable Rate Codec BEnhanced Voice ServicesHalf RateFull RateEnhanced Full RateAlgebraic Code-excited Linear PredictionDolby DigitalDolby AC-4Apple LosslessAsao (codec)Adaptive Transform Acoustic CodingCELTCodec2Dynamic Resolution AdaptationDTS (sound System)FLACInternet Speech Audio CodecMonkey's AudioTTA (codec)MT9MusepackOptimFROGOriginal Sound QualityQualcomm Code-excited Linear PredictionRelaxed Code-excited Linear PredictionRealAudioRTAudioAvid AudioShorten (file Format)SILKSiren (codec)Selectable Mode VocoderSpeexSVOPCTwinVQVariable-Rate Multimode WidebandVorbisVector Sum Excited Linear PredictionWavPackWindows Media AudioMaster Quality AuthenticatedAptXLDAC (codec)Image CompressionGroup 4 CompressionGIFHigh Efficiency Image File FormatHigh Efficiency Video CodingJBIGJBIG2JPEGJPEG 2000JPEG XRLossless JPEGPortable Network GraphicsTagged Image File FormatTIFF/EPTagged Image File FormatAPNGBetter Portable GraphicsDjVuOpenEXRFree Lossless Image FormatICERMultiple-image Network GraphicsProgressive Graphics FileQuickTime VRWireless Application Protocol Bitmap FormatWebPDigital Container FormatElementary StreamPacketized Elementary StreamMPEG Program StreamMPEG Transport StreamISO Base Media File FormatMPEG-4 Part 14Motion JPEG 2000MPEG-21MPEG Media TransportMPEG-2Motion JPEG 2000Real-time Transport Protocol3GP And 3G2AMV Video FormatAdvanced Systems FormatAudio Interchange File FormatAudio Video InterleaveAu File FormatBetter Portable GraphicsBink VideoSmacker VideoBMP File FormatDivXEnhanced VOBFlash VideoGeneral Exchange FormatInterchange File Format.m2tsMatroskaWebMMaterial Exchange FormatOggQuickTime File FormatRatDVDRealMediaResource Interchange File FormatWAVMOD And TODVOBNETVCMPEG-LATemplate:Compression MethodsTemplate:Compression SoftwareTemplate:MPEGTemplate Talk:MPEGMoving Picture Experts GroupMPEG-1MPEG-2MPEG-3MPEG-4MPEG-7MPEG-21MPEG-AMPEG-DMPEG-HMPEG Program StreamH.261MPEG-1 Audio Layer IMPEG-1 Audio Layer IIMP3MPEG Transport StreamMPEG Program StreamH.262/MPEG-2 Part 2MPEG-2 Part 3MPEG-1 Audio Layer IMPEG-2 Audio Layer IIMP3MPEG MultichannelDSM CCAdvanced Audio CodingMPEG-4 Part 2H.263Delivery Multimedia Integration FrameworkH.264/MPEG-4 AVCMPEG-4 Part 11ISO Base Media File FormatMPEG-4 Part 14MPEG-4 Part 17MPEG-4 Part 20Open Font FormatDescription Definition LanguageDigital ItemRights Expression LanguageMPEG SurroundUnified Speech And Audio CodingMPEG Media TransportHigh Efficiency Video CodingMPEG-H 3D AudioHigh Efficiency Image File FormatDynamic Adaptive Streaming Over HTTPHelp:CategoryCategory:Audio CodecsCategory:Lossy Compression AlgorithmsCategory:MPEG-4Category:CS1 Maint: Multiple Names: Authors ListCategory:All Articles With Dead External LinksCategory:Articles With Dead External Links From September 2010Category:Articles With Dead External Links From June 2016Category:All Articles With Unsourced StatementsCategory:Articles With Unsourced Statements From October 2009Category:Articles With Unsourced Statements From February 2013Category:Pages Using RFC Magic LinksDiscussion About Edits From This IP Address [n]A List Of Edits Made From This IP Address [y]View The Content Page [c]Discussion About The Content Page [t]Edit This Page [e]Visit The Main Page [z]Guides To Browsing WikipediaFeatured Content – The Best Of WikipediaFind Background Information On Current EventsLoad A Random Article [x]Guidance On How To Use And Edit WikipediaFind Out About WikipediaAbout The Project, What You Can Do, Where To Find ThingsA List Of Recent Changes In The Wiki [r]List Of All English Wikipedia Pages Containing Links To This Page [j]Recent Changes In Pages Linked From This Page [k]Upload Files [u]A List Of All Special Pages [q]Wikipedia:AboutWikipedia:General Disclaimer



view link view link view link view link view link