A reconfigurable overlapping FFT/IFFT filter for ECG signal de-noising

Dynamic Electrocardiograph (ECG) monitoring (known as Holter) plays an important role in the earlier detection and diagnosis of various cardiovascular diseases. ECG signals obtained from Holter systems normally contain a lot of noises and artifacts. These noises degrade signal quality, which may be critical for routine monitoring and diagnosis. To solve the problem, a reconfigurable overlapping fast Fourier transform/ inverse fast Fourier transform (FFT/IFFT) filter for suppressing the power-line interference and the high-frequency noise is presented in this paper. The filter is based on a 12-lead Holter system with a high-performance analogue front-end and a field-programmable gate array (FPGA) for enhanced digital processing. This paper analyzes the performance of the reconfigurable overlapping FFT/IFFT filter in ECG de-noising applications and validate it by real-world emulations. Furthermore, the de-noising performance of the reconfigurable overlapping FFT filter was evaluated.