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  • Home > Multimedia Terms > AacPlus

    What is AacPlus?


    MPEG-4 Part 3 (formally ISO/IEC 14496-3) is the third part of the ISO/IEC MPEG-4 international standard. It specifies audio coding method.

    The Advanced Audio Coding in MPEG-4 Part 3 was enhanced relative to what was previously specified in MPEG-2 Part 7, in order to provide better sound quality relative to the bit rate used for the encoding.

    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 possiblity of future bitstream incompatabilites. At present there are no known player or codec incompatibilities due to the newness of the standard.

    AAC's mulitple codecs

    * One codec defined in MPEG-4 Part 3 is known as Low Complexity Advanced Audio Coding (LC-AAC).
    * Another codec is known as High-Efficiency Advanced Audio Coding (HE-AAC)
    * Another codec is known as Scalable Sample Rate Advanced Audio Coding (AAC-SSR).
    * Another codec is known as Bit Sliced Arithmetic Coding (BSAC)

    High Efficiency AAC is a lossy data compression scheme for streaming audio. It is based on MPEG-4, and combines three techniques: Advanced Audio Coding (AAC), Spectral Band Replication (SBR), and Parametric Stereo (PS).

    The aacPlus codec was standardized by the MPEG under the High Efficiency AAC (HE-AAC) name. The codec can operate at very low bitrates and is good for Internet radio streaming. It is claimed that a 48 kilobit-per-second stream will produce higher quality output than MP3 at 128 kbit/s. While listening tests[1] suggest that this claim is unfounded, aacPlus generally outperforms other popular codecs in the 32-64 kbit/s range. Its main competition for delivering acceptable quality at these bitrates comes from MP3pro, which also employs SBR.

    aacPlus is supported in the free FAAD2 decoding library (and all players incorporating it), Winamp, and foobar2000. iTunes does not yet support aacPlus; the only players for Mac OS X are VLC and MPlayerOSX.

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    Popular Media Terms

    What is 6CM?
    Six Channel Module.6 channel audio file created by Triton Fasttracker.
    What is 8SVX?
    Amiga 8-Bit Sound File. Sound file recorded in 8-bit quality on an Amiga computer system.
    What is Portable Device?
    A mobile electronic device.
    What is RTP?
    Real-Time Transport Protocol.
    What is F4B?
    Flash Video format.

    Related Codecs

  • Spdifer
  • Spdifer is a DirectShow filter that allows media players to passthrough multi-channel sound to the digital (SPDIF) output without any change.
  • Acelp.net Codec
  • Acelp.net Audio Codec is a speech codec for Windows Media Player, developed by VoiceAge - the World's Premier Supplier of Speech and Audio Codecs.
  • ATSurround Processor
  • The ATSurround Processor is a DSP plugin for the foobar2000 and Winamp audio player. It is able to extract surround information inherently present in many music and audio sources to enhance the listening experience.



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