Reducing Transient Effects in FIR Digital Filters: An Efficient Compensation Technique for Enhanced Impulse Response Stability
Hussein Shakor Mogheer, Yassir Al-Karawi · 2025
Digital finite impulse response filters are significantly used in signal processing, telecommunications, and other technologies nowadays. Unwanted spectral features in the frequency domain result from the abrupt and severe drop in the impulse response using FIR filters. A low-order filter, which produces unpredictable and inconsistent values of the filter coefficients, is principally responsible for this sudden decline. This paper presents and evaluates an efficient method for reducing the transient effects of these filters using a digital filter compensator. To enhance transient response characteristics without increasing the order of the filter, the suggested technique modifies the FIR filter weights by adding fractional components. The planned spectral characteristics of the designed FIR digital filter are enhanced by this modification, leading to a better frequency response and a more noticeable, sharper rejection band in the frequency domain. The distribution of the filter coefficients is a key difference between minimum-phase and lowpass FIR filters. The main magnitude coefficients in the minimum-phase filters are closer to the initiation of the impulse response, while in lowpass FIR filters, they are usually concentrated around the center. To verify the proposed approach, simulations were directed using MATLAB Simulink, focused on the designing of 3rdand 5thorder low-pass FIR filters. The outcomes confirm that the strategy is effective in improving filter performance.