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首页> 外文期刊>Circuits and Systems I: Regular Papers, IEEE Transactions on >Low-Complexity Maximally-Decimated Multirate 3-D Spatio-Temporal FIR Cone and Frustum Filters
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Low-Complexity Maximally-Decimated Multirate 3-D Spatio-Temporal FIR Cone and Frustum Filters

机译：低复杂度最大抽取的多速率3D时空FIR锥和截锥滤波器

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摘要

A low-complexity multirate 3-D spatio-temporal FIR cone and frustum filter structure is proposed having potential applications as a spatio-temporal directional filter. The cone filter structure employs a 1-D modified discrete Fourier transform (DFT) filter bank and 2-D spatial filters. The frustum filter having a double-frustum-shaped passband oriented along the temporal frequency axis is approximated by employing an appropriate subset of subbands. Low computational complexity is achieved by maximal decimation in the temporal dimension, and by employing the DFT-polyphase realization to implement the 1-D modified DFT filter bank. The cone and frustum filters are almost alias free, and provide near-perfect reconstruction. The reduction in computational complexity, relative to undecimated and under-decimated realizations, is numerically confirmed by means of a potential application involving the attenuation of strong broadband plane wave interference.
机译：提出了一种低复杂度的多速率3-D时空FIR锥和平截头体滤波器结构，具有时空定向滤波器的潜在应用。圆锥滤波器结构采用一维改进的离散傅立叶变换（DFT）滤波器组和二维空间滤波器。通过采用适当的子带子集来近似具有沿时间频率轴定向的双截头圆锥形通带的截头圆锥滤波器。通过在时间维度上进行最大抽取，以及通过采用DFT多相实现来实现一维修改的DFT滤波器组，可以实现较低的计算复杂度。视锥和视锥滤镜几乎没有混叠，并提供了近乎完美的重建。相对于未抽样和未抽样的实现，计算复杂度的降低已通过涉及强宽带平面波干扰的衰减的潜在应用而得到了数值证实。

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