Abstract
By further study of MP3 audio decoding algorithms, this paper analyzed the system structure of MP3 decoder and discusses the mapping of each module from algorithm to logic structure. Aiming at hardware implementation, it pro- poses the improved searching method for MP3 audio encoder, based on the features of Huffman decoding. It also adopts the intellectual property core of MP3 comprehensive filter groups and fast IMDCT algorithms. In inverse quantization module the compensated factor is used to make magnitude upgrade of SNR, without multiplications. We use coprocessor to design special instruction set and arithmetic unit by the analysis of fast IMDCT algorithm. It rewrites original C lan- guage and adopts unified DCT-based transforming core algorithm to compute the IMDCT of MP3. It can provide parallel work of IMDCT and LEON3 processor to make accelerated effects.
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