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Efficient digital filter design tool for approximating an FIR filter with a low-order linear-phase IIR filter
Efficient digital filter design tool for approximating an FIR filter with a low-order linear-phase IIR filter
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机译:高效的数字滤波器设计工具,用于将FIR滤波器与低阶线性相位IIR滤波器近似
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摘要
A method and apparatus for designing low-order linear-phase IIR filters is disclosed. Given an FIR filter, the method utilizes a new Krylov subspace projection method, called the rational Arnoldi method with adaptive orders, to synthesize an approximated IIR filter with small orders. The method is efficient in terms of computational complexity. The synthesized IIR filter can truly reflect essential dynamical features of the original FIR filter and indeed satisfies the design specifications. In particular, the linear-phase property is stilled remained in the passband.
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