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A new architecture for the generation of picture based CAPTCHA: A level constrained CSE low power synthesis methodology for fixed point FIR filters

机译:用于生成基于图片的CAPTCHA的新架构:用于定点FIR滤波器的电平受限CSE低功耗综合方法

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The problem of designing FIR filters has received a great attention during the last decade, as the filters are suffering from a large number of multiplications, leading to excessive area and power consumption even if implemented in full custom integrated circuits. Early works have focused on replacing multiplications by decomposing them into simple operations such as addition, subtraction and shifting. As the coefficients of an application specific filter are constant, the decomposition is more efficient than employing multipliers. For complexity mitigation all coefficients of a transposed-form FIR filter are considered as a whole and replaced by a single multiplier block. This is been done using the CSD based technique. The redundancy across the coefficients in the multiplier block is then exploited to share computations and reduce the number of adders. To effectively enable such sharing, a variety of methods have been developed. In this paper a CSE based low power synthesis methodology has been analyzed for the purpose of better power reduction compared to the previous methods.
机译:在过去的十年中,设计FIR滤波器的问题受到了极大的关注,因为滤波器遭受了大量的乘法运算,即使在完全定制的集成电路中实现,也会导致面积和功耗的过大。早期工作着重于通过将乘法分解为简单的运算(例如加法,减法和移位)来代替乘法。由于专用滤波器的系数是恒定的,因此分解比采用乘法器更有效。为了减轻复杂性,将转置形式的FIR滤波器的所有系数视为一个整体,并由一个乘法器块代替。这是使用基于CSD的技术完成的。然后利用乘法器块中系数的冗余来共享计算并减少加法器的数量。为了有效地实现这种共享,已经开发了多种方法。在本文中,基于CSE的低功耗合成方法已进行了分析,目的是与以前的方法相比,可以更好地降低功耗。

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