There are two different rates that can be determined on an ECG. The atrial rate is indicated by the frequency of the P waves. The ventricular rate is indicated by the frequency of the QRS complexes.

as there is no pattern to their frequency. This is commonly described as varying RR intervals. This means an ECG showing atrial fibrillation will have no visible P waves and an irregularly ...

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The differential signal then goes through a low-pass filter to remove high-frequency noise, after which it enters an ADS1291 ECG analog front-end chip. The ADS1291 contains a delta-sigma analog-to ...