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arXiv 0907.3654cs.ITcs.SYeess.SYmath.ITmath.OC
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综合过采样复滤波器组的优化

Optimization of Synthesis Oversampled Complex Filter Banks

Jerome Gauthier, Laurent Duval, Jean-Christophe Pesquet

摘要:

过采样FIR分析滤波器组(FB)的一个重要问题是确定逆合成FB(当它们存在时)。给定任何复过采样FIR分析FB,我们首先提供一个算法来确定是否存在逆FIR合成系统。我们还提供了一种方法,以确保厄米对称性的合成侧,这是服务于处理实值信号。由于可逆分析方案对应于冗余分解,因此不存在唯一的逆FB。给定一个特殊的解决方案,我们参数化整个家庭的逆通过零空间投影。由此产生的减少的参数集简化了设计过程,因为完美的重建约束优化问题被重铸为无约束优化问题。基于时间或频率局部化准则的优化合成FB的设计,然后研究,使用一个简单而有效的梯度算法。

英文摘要:

An important issue with oversampled FIR analysis filter banks (FBs) is to determine inverse synthesis FBs, when they exist. Given any complex oversampled FIR analysis FB, we first provide an algorithm to determine whether there exists an inverse FIR synthesis system. We also provide a method to ensure the Hermitian symmetry property on the synthesis side, which is serviceable to processing real-valued signals. As an invertible analysis scheme corresponds to a redundant decomposition, there is no unique inverse FB. Given a particular solution, we parameterize the whole family of inverses through a null space projection. The resulting reduced parameter set simplifies design procedures, since the perfect reconstruction constrained optimization problem is recast as an unconstrained optimization problem. The design of optimized synthesis FBs based on time or frequency localization criteria is then investigated, using a simple yet efficient gradient algorithm.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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