[Mp4-tech] [Audio] Understanding SBR Decoding

[Garima Singh]

Hi All,
   
  I have some questions regarding SBR decoding.
   
  In AAC-LC each channel data of one frame is of 1024 samples , but in HE-AAC decoder, 1024 samples output of AAC-LC produces 2048 samples output from QMF synthesis bank. Could you please explain how are these mapped to channels? 

  Also in the SBR decoder, if core AAC decoder works on X sampling rate then SBR decoder works on 2X sampling rate.My question here is what will be the sampling rate of input signal (X or 2X) ?
   
  Thanks,
   


Regards,
Garima Singh 

TIVR Communications - Delivering Efficient Solutions for Mobile Multimedia 
www.tivr.co.in

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