Optimization of Fixed-Point Operation of MPEG-2 AAC Decoder

H. Hou, S. Zhang, and W. Dou (PRC)

Keywords

MPEG, AAC, decoder, optimization, fixedpoint

Abstract

This paper presents a fast fixed-point implementation of MPEG-2 AAC-LC (Advanced Audio Coding, Low Complexity profile defined in ISO/IEC13818-7) audio decoder. By analyzing the decoding algorithm, we propose tuned optimization strategies for improving the decoding speed of the main modules of the decoder. After these optimizations, the designed fixed-point AAC-LC decoder is proved to be 20% faster than the reference decoder, FAAD2, an open source AAC. The decoding result also illustrates the high quality as the reference.

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