Tunable Frequency Response Research Articles

An IIR Structure for Digital Tunable Frequency Response Filter, Adaptive Notch Filtering and Line Enhancers

In this paper, the properties of a second order IIR filter structure will be explored. A simple procedure is given to design the filter parameters such that it can be used as a tunable frequency response filter, a notch filter or as a line enhancer with specific characteristics. In the case of adaptive applications, the asymptotic properties of the filter is studied by evaluating the Cramer Rao Lower Bound for the filter parameter where the signal consists of a sinusoid in noise. An application of the filter to retrieve the roll eccentricity signal in a steel rolling mill will also be given

Tunable digital frequency response equalization filters

Tunable digital frequency response equalization filters, which feature adjustable gain at specified frequencies while leaving the remainder of the spectrum unaffected, are advanced. The filter structure is such that the frequency response parameters are independently related to the multiplier coefficients, which permits simple frequency response adjustment by varying the coefficient values. The resulting structure exhibits low coefficient sensitivity characteristics.