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AAC Advanced Audio Coding

AAC Advanced Audio Coding. Summary. More possible Channels than MP3 48:5 full audio channels 16:1 low frequency channels Higher possible sampling rates 96KHz instead of 48KHz

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AAC Advanced Audio Coding

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  1. AAC Advanced Audio Coding

  2. Summary More possible Channels than MP3 48:5 full audio channels 16:1 low frequency channels Higher possible sampling rates 96KHz instead of 48KHz “MPEG formal listening tests have demonstrate that for 2 channels it is able to provide slightly better audio quality at 96 kb/s than layer-3 at 128 kb/s or layer-2 at 192 kb/s.”

  3. MPEG-2 NBC Also known as: MPEG-2 Non-Backward Compatible Doesn't have to be compatible Can use MP3's coding techniques more efficiently Also adds some new coding techniques

  4. Some Changes From MP3 • Pure MDCT, not hybrid filter • Longer long windows • Shorter short windows

  5. New Coding Tools • PNS: Perceptual Noise Substitution • LTP: Long Term Prediction

  6. References • http://en.wikipedia.org/wiki/Advanced_Audio_Coding • http://www.mpeg.org/MPEG/aac.html • http://www.mp3-tech.org/aac.html

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