A novel Q-varying digital IIR notch filter effectively reduces transient duration while maintaining high selectivity, which may improve ECG signal processing.
May shorten ECG filter transients in monitoring; hypothesis-generating from simulations and requires real-world validation before adoption.
In many measurement applications, it is required to have notch filters that simultaneously possess a very selective magnitude response (high quality factorQ) and a transient response of short duration. However, increasing the quality factor also increases the duration of the transient process in the filter after the action of the excitation. This paper presents a new concept of digital IIR notch filters, whose quality factor changes with time. Owing to a temporary change in the value of the quality factor, the transient can considerably be reduced. Simulations verifying the effectiveness of the proposedQ-varying IIR notch filter are presented and compared with the performance of the traditionalQ-constant filter using ECG signals with unwanted sinusoidal interference as a study case.
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Jacek Piskorowski (2009) studied this question.
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