Spectral Band Replication (SBR) has been combined with MPEG AAC as bandwidth extension tool. The resulting scheme is referred to as the MPEG-4 High Efficient (HE) AAC or aacPlus. With SBR module taking care of the high frequency contents, the conventional AAC encoder can compress the low frequency part using most of the available bits. The SBR parameters are all calculated by SBR encoder in complex domain in the architecture of conventional QMF. If the components in SBR encoder can be implemented in real domain, the computational complexity of HE-AAC will be reduced by half. This paper proposes the Low Power MPEG-4 HE-AAC encoder to reduce the computational complexity. The objective experiments are conducted to demonstrate the quality of Low Power HE-AAC encoder on critical music tracks. Finally, the paper will extend Low Power technique to Parametric Stereo (PS) Encoder with HE-AAC.
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