In this paper, we discuss a practical way to filter an ECG signal in the background of interference signals. This will be achieved by designing the low pass filter (LPF) with Kaiser window of variable pass-band (four passbands) of type finite impulse response (FIR) using a digital programmable device (Cyclone II EP2C70F896C6 FPGA from ALTERA) placed on education and development board DE2-70, this filter is designed by VHDL with Quartus II 9.1 design environment and consists of two filters (LPF) connected on serial.
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