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BILINEAR ALGORITHMS AND VLSI IMPLEMENTATIONS OF FORWARD AND INVERSE MDCT WITH APPLICATIONS TO MP3 AUDIO
BILINEAR ALGORITHMS AND VLSI IMPLEMENTATIONS OF FORWARD AND INVERSE MDCT WITH APPLICATIONS TO MP3 AUDIO
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机译:正反MDCT的双线性算法和VLSI实现及其在MP3音频中的应用
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摘要
Methods and applications are provided for hardware efficient bilinear algorithms to compute MDCT/IMDCT of 4x3Λn points. The algorithms for composite lengths have practical application in MPEG-1/2 layer III (MP3) audio encoding and decoding. The MDCT/IMDCT can be converted to type-IV discrete cosine transform. Using group theory, the present approach decomposes DCT-IV transform kernel matrix into groups of cyclic, Hankel and/or Toeplix matrices. Bilinear algorithms are then applied to efficiently evaluate these groups. When implemented in very large-scale integration, the bilinear algorithms have improved the critical path delays over other known solutions.
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