Design of recursive digital filters with variable characteristics
Design of recursive digital filters with variable characteristics
复制标题
可变特性递归数字滤波器的设计
DOI：
10.1002/cta.4490180202
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Hannu Roivainen
中科院分区：
文献类型：
--
作者：
S. Mitra;Y. Neuvo;Hannu Roivainen
本文提出了一种改变单参数无限冲激响应（IIR）数字滤波器截止频率的新方法。该方法基于低通到低通频率变换的泰勒级数展开的使用。滤波器结构是真实的或复数全通部分的并联连接。对于窄带滤波器，调谐范围是几个倍频程。通过取互补输出，容易地获得具有可调谐交叉频率的功率互补滤波器对。可调的中心频率和带宽是通过将一个特殊的低通到带通变换的结构。设计示例和信号处理器实现的描述包括在内。
A new method for changing the cut-off frequency of infinite impulse response (IIR) digital filters with a single parameter is derived. the method is based on the use of the Taylor series expansion of the lowpass-to-lowpass frequency transformation. the filter structure is a parallel connection of real or complex allpass sections. the tuning range is several octaves for narrowband filters. By taking also the complementary output, a power-complementary filter pair with tunable crossover frequency is readily obtained. Tunable centre frequency and bandwidth are obtained by incorporating a special lowpass-to-bandpass transformation into the structure. Design examples and a description of a signal processor implementation are included.