This study presents a novel implementation technique for linear phase variable bandwidth finite impulse response (FIR) filters with a noticeable reduction in transition bandwidth as well as hardware complexity. In this proposition, concept of Farrow structure based design technique is effectively utilised; whereas the fixed sub-filters are constructed from a generalised interpolated bandpass method based low-pass FIR filter by means of different techniques such as interpolation, up-sampling and masking. Simulation results have shown the frequency response characteristics of several variable bandwidth FIR filters, designed with the help of the proposed architecture. Simulation results have shown a drastic reduction of transition bandwidth resulting from the proposed variable bandwidth FIR filters of up to ∼70–80%, when compared with other state-of-the-art filtering techniques, with a significant reduction in hardware complexity of up to ∼50%.

中文翻译：

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窄过渡带可变带宽数字滤波器的设计

这项研究提出了一种线性相位可变带宽有限冲激响应（FIR）滤波器的新颖实现技术，该技术显着降低了转换带宽以及硬件复杂性。在这一命题中，有效利用了基于Farrow结构的设计技术的概念。固定子滤波器是通过基于内插，上采样和掩蔽等不同技术的，基于广义内插带通方法的低通FIR滤波器构成的。仿真结果表明，借助于所提出的体系结构设计的几个可变带宽FIR滤波器的频率响应特性。仿真结果表明，所提出的可变带宽FIR滤波器可将转换带宽大幅度降低，降低幅度约为70-80％，