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| | Advanced Audio Coding - Wikipedia, the free encyclopedia |
 | | In any case, the AAC technical specification needs to be unified at all levels some time in the future to avoid future technology interaction problems. | | | Signal components that are perceptually irrelevant are discarded. | | | In contrast to MP3's hybrid filterbank, AAC uses the modified discrete cosine transform (MDCT) together with the increased window lengths of 2,048 points. |
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http://en.wikipedia.org/wiki/Advanced_Audio_Coding
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| | Linux.com Article DB: Using Advanced Audio Coding Under Linux - 1/1 |
| | Like several compression algorithms, a lot of the algorithms which make the AAC specification are patented, and royalties have to be paid to use them in commercial environments (see the AAC Patent License Agreement). | | | Lots of other encoding technologies have made their debut since then, some of which, such as Ogg Vorbis, are far better than MP3. | | | Creating AAC files using FAAC is similar to creating MP3 files. |
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http://linux.omnipotent.net/article.php?article_id=11500
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| | Codecs - Streaming Audio - Multimedia - Nuntius |
| | Impartial labs have tested AAC and consider it to be of high quality. | | | Object-based coding functionalities allow for interaction with audio-visual objects and enable new interactive applications in a mobile environment. | | | Optionally, the error resilient bitstream syntax may be used. |
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http://www.nuntius.com/solutions31.html
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| | AAC INFORMATION PAGE |
| | AAC uses a complex enoding algorithm to achieve this and | | | AAC (MPEG2-AAC) is an encoding scheme designed to | | | I am delighted to present a new high-quality AAC software package. |
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http://www.fortunecity.com/tinpan/miles/528/aacinfo.htm
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| | Rane Professional Audio Reference (A) |
| | ADC (or A/D, analog-to-digital converter) The electronic component which converts the instantaneous value of an analog input signal to a digital word (represented as a binary number) for digital signal processing. | | | An ActiveX component is a unit of executable code (such as an.exe file) that follows the Active X specification for providing objects. | | | ARM (advanced RISC machines) The name for a microprocessor group formed from Acorn, backed by Apple, VLSI Technology and Nippon Investment and Finance, in 1990. |
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http://www.rane.com/par-a.html
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| | AudioCoding.com - Knowledge Base |
| | See MPEG-4 AAC Version 3 for some examples. | | | One example is Apple's iPod that only decodes the LC profile, not HE AAC yet and doesn't recognize *.mp4 files, only *.m4a, *.m4b and *.m4p, Apple's own "creations" for MP4 file extensions. | | | ADIF Audio Data Interchange Format, only one header at the beginning of the file, then raw data blocks |
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http://www.audiocoding.com/modules/wiki?page=AAC
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| | AES 115th Convention: PAPERS - SESSION Z7 |
| | The coding performance of ASC is characterized and it is shown that due to its underlying structure, additional functionalities other than compression are also possible namely bitstream semantic scalability, access, and classification. | | | Simulation results indicate that the proposed cascaded trellis-based optimization scheme has a coding performance close to that of the joint trellis-based scheme, but it requires only 1/70 computation. | | | It leads to a near-optimal selection of parameters at the cost of extremely high computational complexity. |
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http://www.aes.org/events/115/papers/SessionZ7.cfm
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| | Advanced Audio Coding (MPEG-2), Audio Data Interchange Format |
| | According to the AudioCodingWiki, the ADIF format actually is just one header at the beginning of the AAC file. | | | ADIF stands for Audio Data Interchange Format and consists of a brief header that precedes AAC data in a file. | | | The ADIF header is made up of the following fields: |
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http://www.digitalpreservation.gov/formats/fdd/fdd000112.shtml
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| | Citations: ISO-IEC MPEG-2 Advanced Audio Coding - Bosi, Brandenburg (ResearchIndex) |
| | Under this convenient assumption, the optimal solution is identical for both the objective measures, and parameters for each frequency band can be optimized independently using a.... | | | In the conventional approach to scalable coding, each encoding.... | | | The optimal multi layer approach is first demonstrated on a synthetic memoryless Laplace source under law companded system. |
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http://citeseer.ist.psu.edu/context/388686/0
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| | AAC: Definition and Much More From Answers.com |
| | AAC is available in profiles, which determine how the algorithms work to encode the audio data. | | | With the iTunes jukebox software, CDs can be ripped to the AAC format as well. | | | Following are the various file extensions used to store AAC-encoded files: |
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http://www.answers.com/main/ntquery?tname=aac
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| | [No title] |
| | The audio software algorithms (software IPs) specially tailored for the ARCtangent-A4 microprocessor are based on Fraunhofer IIS's fixed point reference CODECs. | | | In addition, further customization of the processor allows developers to differentiate their MP3 or AAC solution for vendor or market specific variations. | | | Unlike current off-the shelf solutions such as MP3 decoder ICs, this new solution provides developers with a very high level of flexibility and independence enabling customers to optimize cost by manufacturing their chips at virtually any semiconductor foundry. |
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http://www.arc.com/newsandevents/PressRelease.html?print=TRUE&id=13
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| | MPEG . ORG - MPEG Audio Resources and Software |
| | In no event shall MpegTV be liable for direct, indirect, special, incidental or consequential damages arising out of the use or inability to use informations, softwares, bitstreams and other data found on or referenced by the MPEG.ORG Website. | | | MPEG Audio headers guide by Predrag Supurovic (new) | | | More general MPEG overviews can be found on the MPEG Starting Points page. |
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http://www.mpeg.org/MPEG/audio.html
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| | Overview of MPEG AAC Audio Coding |
| | AAC is the most powerful coding method available in Zephyr Xstream, and we particularly like it because it is perfectly matched to the bitrates available on ISDN BRI lines. | | | The development of AAC began when researchers became convinced that significant improvements would be possible by abandoning backward compatibility to the earlier MPEG layers. | | | AAC is the first codec system to fulfill the ITU-R/EBU requirements for indistinguishable quality at 128 kbps/stereo. |
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http://www.telos-systems.com/techtalk/aac
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| | Fraunhofer IIS - Press Release - Advanced Audio Coding AAC - the Sound of the 21st Century |
| | Both AAC components have been developed by scientists and engineers at Fraunhofer Institute for Integrated Circuits in Erlangen, Germany. | | | There had been algorithms for these signals in MPEG-2 BC for quite a while. | | | With the latest advances in memory technology, Flash-ROMs allow to build small and shock-robust audio players based on the technology of MPEG Layer-3. |
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http://www.iis.fraunhofer.de/pub_rel/presse/1998/aes105s
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| | AAC - Advanced Audio Coding, Authorization and Access Control |
| | AAC was developed (just like MP3) by the "Fraunhofer Institut für integrierte Schaltungen". | | | More information about the definition of AAC may appear below: | | | Advance Audio Coding, one of the coding standards adapted in MPEG-2 and MPEG-4, ISO/IEC 13818-7. |
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http://www.auditmypc.com/acronym/AAC.asp
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| | Audio Research Labs |
| | Schuyler Quackenbush is an expert in audio signal processing, audio signal compression, real-time implementation of algorithms, assessment of algorithm complexity and speed-up of software realizations. | | | Lacy, J. Quackenbush, S. and Snyder, J. "Custom Huffman coding tables for encoding,"' U. | | | Quackenbush, S. and Johnston, J. "Noiseless coding of spectral components in MPEG-2 advanced audio coding," 1997 IEEE ASSP Workshop on Appl. |
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http://www.audioresearchlabs.com/srq.html
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| | Apple's Making Serious Music |
| | The copy protection code is embedded into the new iTunes store, the new iPod and the upgrade software for existing iPods. | | | However, the new iTunes software will only allow a single playlist to be burned 10 times thanks to Apple's proprietary encryption technology (codenamed FairPlay). | | | The platform's codec (define) is based on Advanced Audio Coding (AAC) technology at 128 kbps, which was developed by Dolby Laboratories and is a key feature within the MPEG-4 standard. |
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http://siliconvalley.internet.com/news/article.php/2197271
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| | Perceptual Audio Coding - Wikipedia, the free encyclopedia |
| | A known software implementation of this codec is CelestialTech's AudioLib. | | | Perceptual Audio Coding (PAC) is an algorithm, like MPEG's MP3 standard, used to compress digital audio by removing extraneous information not perceived by most people. | | | PAC is very similar to Advanced Audio Coding, the latter sharing many design elements. |
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http://en.wikipedia.org/wiki/Perceptual_Audio_Coding
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| | Advanced Audio Coding |
| | Nevertheless, AAC is gaining in popularity, thanks in no small part to Apple’s popular iTunes software. | | | AAC has become one of the most full featured and highest quality audio encoding systems to date. | | | AAC is superior to MP3 in virtually every way, and an increasing number of hardware players are enabling AAC playback. |
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http://www.mrbrook.com/lin/aac.html
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| | ACC |
| | source code are avaible, but sound quality is not yet optimized: | | | This reduces audio quality for some special audio signals but saves a lot of computational power in both encoding and especially decoding. | | | An aac decoder and an aac encoder for win32, based on the ISO |
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http://members.tripod.com/mp3_magazine/info_aac.htm
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| | Overview of MPEG-2 AAC Audio Coding |
| | Telos Systems' Layer 3 implementation was developed in close collaboration with its developer, Fraunhofer-Gesellschaft. | | | In 1997, another algorithm, Advanced Audio Coding (AAC) was added to the MPEG standard. | | | Telos Systems' pioneering work in ISDN for broadcast use resulted in the world's first codec with MPEG Layer 3 and Layer 2 capability, the Telos Zephyr, and the world's first codec with AAC (Advanced Audio Coding), the Zephyr Xstream. |
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http://www.telos-systems.com/techtalk/mpeg
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| | AAC Audio Codec |
| | Fully functional evaluation object code (available upon request) | | | The product is supplied with test environment and integration example code. | | | AAC (Advanced Audio Coding) is the latest audio coding standard, defined in the MPEG-2 standard, is used for high-quality audio compression. |
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http://www.spiritcorp.com/aac_decoder.html
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| | AES 115th Convention: PAPERS - SESSION C |
| | Today it is present on virtually any computer, CD, DVD-player, many car radios, and of course in the many MP3 audio player devices. | | | The system provides bit-exact reconstruction of the input signal independent of the implementation accuracy of the AAC core coder. | | | It is combined with MPEG Advanced Audio Coding (AAC) and improves coding efficiency by more than 30 percent. |
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http://www.aes.org/events/115/papers/SessionC.cfm
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| | Apple - QuickTime - Technologies - AAC Audio |
| | In numerous comparison tests, AAC comes out on top. | | | AAC was developed by the MPEG group that includes Dolby, Fraunhofer (FhG), ATandT, Sony and Nokia—companies that have also been involved in the development of audio codecs such as MP3 and AC3 (also known as Dolby Digital). | | | As a result of its support for this technology, the audio you create with QuickTime is interoperable with a wide range of devices and media players. |
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http://www.apple.com/quicktime/technologies/aac
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| | What is AAC? - A Word Definition From the Webopedia Computer Dictionary |
| | You are in the: Small Business Computing Channel | | | AAC is sometimes referred to as MPEG-2 NBC (not backwards compatible) because it is not compatible with the MPEG-1 coding scheme. | | | Information about AAC technology, applications, products, and industry developments. |
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http://www.webopedia.com/TERM/A/AAC.html
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| | Cirrus Logic’s Audio DSP Decoders First To Support Multi-Channel AAC Advanced Audio Coding |
| | Cirrus Logic is a premier supplier of high-performance analog and DSP chip solutions for Internet entertainment electronics. | | | Using one of these Crystal audio decoder chips, OEMs can now manufacture set-top boxes, digital televisions and AV receivers that are compatible with popular audio standards around the world. | | | “AAC is an emerging broadcast audio format in Japan, and Crystal has been very aggressive in its pursuit of this market,” stated Andrew Fischer, business development manager for AAC at Dolby Laboratories. |
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http://www.cirrus.com/en/press/releases/P164.html
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| | AudioCoding.com - Open Source AAC Codecs and Knowledge Base |
| | AudioCoding.com - Open Source AAC Codecs and Knowledge Base | | | Support of Parametric stereo in FAAD2 source code | | | Latest addition in the 2.0 version of the FAAD2 decoder library is the ability to decode HE AAC (High Efficiency) and PS AAC (Parametric Stereo) files. |
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http://www.audiocoding.com
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| | Definition: AAC (Advanced Audio Coding) [Web and XML Glossary] |
| | AAC provides more sophisticated audio coding than MPEG-2 BC audio coding (the other audio coding method of MPEG-2, better known as MP3), but it is not as widely spread. | | | AAC is one of two audio coding methods defined by the MPEG-2 standard. | | | It is not backward compatible with MPEG-1 audio coding, which is why it is sometimes also referred to as the "non backward compatible" audio coding of MPEG-2. |
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http://dret.net/glossary/aac
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| | Advanced audio coding |
| | Higher coding efficency for stationary signals (blocksize: 576 -> 1024 samples) | | | Higher coding efficency for transient signals (blocksize: 192 -> 128 samples) | | | In April 2003, Apple Computer brought mainstream attention to AAC by announcing that its iPod and iTunes products would support songs in AAC format, and that customers could download popular songs in this format via the internet. |
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http://www.ebroadcast.com.au/lookup/encyclopedia/ad/Advanced_audio_coding.html
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| | The Astronomer - May 2005 |
| | Advanced Audio Coding Software Now Available From Fraunhofer IIS | | | According to Marc Gayer, project manager of fixed-point audio coding for Fraunhofer, "We have seen that with 'out of the box' C code, the StarCore processor performs as well as competing architectures and has more optimization potential." | | | Fraunhofer IIS, the leading international research lab in the field of high-quality, low bit rate audio coding and the "home of MP3," has been working closely with StarCore to implement latest MPEG audio codecs on StarCore processors. |
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http://www.starcore-dsp.com/astronomer/issues/astronomer_may_2005.shtml
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| | MPEG-2 AAC - Advanced Audio Coding - Gary J. Murakami |
| | MPEG-2 AAC - Advanced Audio Coding - Gary J. Murakami | | | Prediction: uses LPC speech coding technique for appropriate signals | | | Noiseless Coding: huffman coding removes redundancy in banded and sectioned quantized spectrum (11 codebooks) |
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http://www.nobell.org/~gjm/imusic/mpeg2aac.html
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| | The 109th AES Convention - Dolby AAC, Dolby Headphone and DTS Music |
| | Developed for broadcast, Internet, and other electronic music-distribution applications, AAC is currently in use by industry powerhouses. | | | AES Exhibits showcased diverse audio technologies of interest to both consumer and pro audio, ranging from hardware advancements to exotic surround processing formats. | | | The developers claim that compared to the popular MPEG Layer-3 (MP3), AAC provides significantly higher-quality audio yet requires approximately 30 percent less storage space and bandwidth. |
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http://www.smr-home-theatre.org/aes109/page_13.html
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| | Stereophile: Universal, BMG Embrace "Advanced Audio Coding" for Downloads |
| | A Dolby Labs press release states that AAC offers higher-quality audio at lower bit rates than MP3, while being completely compliant with the requirements of Digital Rights Management and the Secure Digital Music Initiative (SDMI). | | | "Advanced Audio Coding" (AAC) is said to offer higher audio quality while occupying 30% less bandwidth and storage space than the popular MP3 format, according to an announcement from San Francisco–based Dolby Laboratories. | | | Developed and standardized by four major technology companies—AT&T, Dolby, Fraunhofer IIS, and Sony Corporation—AAC is said to provide up to 48 channels of audio (at unspecified levels of resolution), sample rates of up to 96kHz, and can support an "ITU-R broadcast-quality" datastream at 320kb/s for 5.1-channel audio programs. |
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http://www.stereophile.com/news/10835
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| | dBpowerAMP |
| | *** Also look at mp4 codec here, it uses AAC streams inside mp4 files ** |
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http://www.dbpoweramp.com/codec-central-aac.htm
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