Datasheet

Evaluation of ECG and Respiration Specific Functions

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Figure 38. Frequency Response for the IIR Filter

Multiband-pass Filter

Multiband-pass filter (MBF) is used for removing unwanted signals and power line noise from the live data.

The MBF digital filter is a 161 order FIR filter with Hamming window having cut-off at 150Hz and notch at

50/60 Hz. The notch frequency is selectable from the PC application. This filter provides a very sharp cut-

off around 150 Hz with attenuation more than 30 dB at the stop band. The notch at 50/60 Hz provides

attenuation of more than 30 dB. Sampling frequency is 500 samples/ second.

The frequency response of the filter with a 50 Hz notch is shown in Figure 39, Figure 40, and Figure 41.

Figure 39. Frequency Response for the MBF Filter (Full View)

ADS1x9xECG-FE Demonstration Kit SLAU384A–December 2011–Revised April 2012

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