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The paper presents a concept of designing a stable time-varying IIR narrow multi-band-stop filter. The proposed structure is based on an all-pass prototype. The stability analysis of the time-varying design is presented. In order to reduce the transient time, the varying rejection bandwidth in time is introduced. The paper also presents the idea of the LUT's (Lookup Table) to control the memory usage...
This paper presents experimental results of a stable time-varying IIR narrow multi-band-stop filter. The design and stability check procedures have been shown. The experimental hardware used to conduct the measurement of the ECG was presented. The concept of the time-varying coefficients was used in order to reduce the transient time of the filtering structure. The advantages of the proposed methodology...
The paper presents an attempt to implement the concept of time-varying IIR filters in an easily accessed microcontrollers. The problem in terms of choosing an efficient sets of coefficients is discussed along with maintaining stability of the time varying structure. The difficulties that arise with the idea of implementation of the optimal solutions are briefly discussed. The experimental part of...
In some measurement applications, it is required to have digital filters which simultaneously possess a constant group delay in the passband and a narrow transition band. This kind of filters is usually implemented using allpass filter section which compensates the unfavorable run of the group delay response of the original filter. Unfortunately, the process of equalisation affects the time domain...
The paper presents a graphical user interface for designing time-varying IIR filters with equalised group delay characteristic. The problem of non-constant group delay characteristic of the IIR filters is well known. The allpass based equalisers are used as a solution with fine results. Unfortunately, the equalisation introduces distortions to the time-domain characteristics of the original IIR filter...
The paper presents a stability analysis of linear time-varying IIR filter with equalized group delay characteristic. A problem of a non-linear phase response of an IIR filter is introduced. An allpass equalizer as a solution is proposed. The changes in the time domain that additional component introduces into the system is pointed out. The linear time-varying difference equation describing the IIR...
Known problem regarding non-linear phase response of IIR filters is pointed out. An analytical approach of compensating group delay response of digital low-pass filters is introduced. The design procedure of an IIR low order equalizer for the elliptic filter is shown. Results are presented and compared with known methods. Proposed methodology is found to be very competitive in terms of preventing...
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