数据采集与处理2013，Vol.28Issue(1)：110-116,7.
余弦调制子带滤波器组迭代设计的改进算法
Modified Design Algorithm for Cosine-Modulated Subband Filter Banks Based on Iteration
摘要
Abstract
The design of cosine-modulated subband filter banks can be converted to a high-dimension nonlinear optimization problem, but the orders of designed fitter banks are generally too high, because of its aliasing error controll relied by the stop band attenuation. A modified iteration design method for cosine-modulated filter banks (CMFB) is proposed. Its new cost function consists of system response, stopband energy and the first aliasing factor which is added to eliminate the aliasing error more effectively. The cost function is formulated as a quadratic function whose minimum point can be obtained using a closed-form solution. The minimum point is approached by iteration in the algorithm, which is simpler and more realizable than the direct optimization method. Simulation results demonstrate that the algorithm can be used to design the subband filter banks with less aliasing error and shorter length, comparing with the conventional iteration design method.关键词
子带滤波器组/余弦调制/代价函数/混叠误差Key words
subband filter banks/ cosine modulation/ cost function/ aliasing error分类
信息技术与安全科学引用本文复制引用
赵艳,罗胜恩,万坚..余弦调制子带滤波器组迭代设计的改进算法[J].数据采集与处理,2013,28(1):110-116,7.基金项目
国家自然科学基金(60572093)资助项目. （60572093）
