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BILINEAR ALGORITHMS AND VLSI IMPLEMENTATIONS OF FORWARD AND INVERSE MDCT WITH APPLICATIONS TO MP3 AUDIO

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

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.
机译:提供了用于硬件高效的双线性算法以计算4x3Λn点的MDCT / IMDCT的方法和应用。复合长度算法在MPEG-1 / 2 III层(MP3)音频编码和解码中具有实际应用。 MDCT / IMDCT可以转换为IV型离散余弦变换。使用组理论,本方法将DCT-IV变换核矩阵分解为循环,汉克尔和/或Toeplix矩阵的组。然后应用双线性算法来有效地评估这些组。当以大规模集成实现时,双线性算法比其他已知解决方案改善了关键路径延迟。

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