| 硬件资源消耗少的IMDCT分解算法 |
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| 引用本文： | 李辉,李平,王忆文. 硬件资源消耗少的IMDCT分解算法[J]. 电子科技大学学报(自然科学版), 2011, 40(1): 26-29. DOI: 10.3969/j.issn.1001-0548.2011.01.005 |
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| 作者姓名： | 李辉 李平 王忆文 |
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| 作者单位： | 1.电子科技大学电子薄膜与集成器件国家重点实验室 成都 610054 |
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| 基金项目： | 广东省教育部产学研合作项目 |
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| 摘 要： | 提出一种新的改进离散余弦反变换(IMDCT)分解算法,把变换长度为N点的IMDCT分解为一对N/4点的Ⅳ-型离散余弦变换(DCT-IV/DCT-IV).该变换的实现可以共享部分资源,从而减少所需的硬件.与已有的一些IMDCT快速算法相比,新的分解算法计算效率提高了3倍;硬件实现减少了1个锁存器(20%),4个加法器(4...
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| 关 键 词： | 加速器 解码 硬件 改进离散余弦反变换 时域混叠抵消 |
| 收稿时间： | 2009-06-22 |
Hardware-Efficient Decomposition Algorithm for IMDCT Computation |
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| LI Hui,LI Ping,WANG Yi-wen. Hardware-Efficient Decomposition Algorithm for IMDCT Computation[J]. Journal of University of Electronic Science and Technology of China, 2011, 40(1): 26-29. DOI: 10.3969/j.issn.1001-0548.2011.01.005 |
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| Authors: | LI Hui LI Ping WANG Yi-wen |
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| Affiliation: | 1.State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China Chengdu 610054 |
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| Abstract: | A new decomposition algorithm for inverse modified discrete cosine transform (IMDCT) computation is presented. The algorithm converses an N-point IMDCT to a pair of N/4-point type-IV discrete cosine transforms (DCT-IV/DCT-IV). Due to resource sharing, the implementation of DCT/DCT is hardware-efficient. Comparing with some well-known IMDCT algorithms, the proposed algorithm has higher computational efficiency (3 times higher) and requires 1 latch (20%), 4 adders (44%) and 3 multipliers (50%) less. To verify the proposed fast algorithm, a hardware accelerator based on the algorithm is designed and applied to the decoding of an AC-3 audio. The experimental results demonstrate that the AC-3 audio can be decoded in real time and therefore verify the practicability of the decomposition algorithm. |
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