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Wednesday, August 12, 2009

HE-AAC Decoder

HE-AAC decoder on ARM9E and TI C64x+

AAC is a popular audio coding technique recommended by MPEG committee. SBR is a tool used in combination with the AAC general audio codec resulting in HE-AAC (also known as aacPlus). It provides significant increase in coding gain. In SBR, the high-band, i.e. the high frequency part of the spectrum is replicated using the low-band.

The bit-rate is by far below the bit-rate required when using conventional AAC coding. This translates into better quality at lower bit-rates.It can be used in consumer applications like mobile streaming and download, digital terrestrial, cable & satellite television broadcasting and Internet Video on demand service.

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