Cascaded Trellis-Based Optimization for MPEG-4 Advanced Audio Coding

A low complexity and high performance scheme for choosing MPEG-4 Advanced Audio Coding (AAC) parameters is proposed. One key element in producing good quality compressed audio at low rates in particular is selecting proper coding parameter values. A joint trellis-based optimization approach has thus been previously proposed. It leads to a near-optimal selection of parameters at the cost of extremely high computational complexity. It is, therefore, very desirable to achieve a similar coding performance (audio quality) at a much lower complexity. Simulation results indicate that our proposed cascaded trellis-based optimization scheme has a coding performance close to that of the joint trellis-based scheme, and it requires only 1/70 in computation.

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