Hot answers tagged

4

Biological signals are analogues and hence continuous. Early EEG systems simply recorded the analogue signals and displayed it as a continuous signal graphically as wiggly lines written by little pens on a roll of paper (Fig. 1). Only after analogue-to-digital converters became available, could EEG signals and the likes be digitally sampled. Fig. 1. ...


3

A variety of packages exist that allow the calculation of these metrics. I will describe these packages by category: Software Kubios is a program from Finland that has a nice GUI, in which you can import both ECG data or IBI (not PPG), to calculate all the metrics. They support some a variety of file-formats, but you can import any other text-file with ...


2

The difference is rather simple. NN-intervals refer to the intervals between normal R-peaks. During a measurement, artifacts may arise due to arrhythmic events or faulty sensors, for example (Citi, Brown & Barbieri, 2012). This may lead to abnormal R-peaks, which may in turn distort the statistical measures. To ensure reliable and valid data, only normal ...


1

To add to the answer provided by @AliceD, pure digital waveforms are square waveforms as they represent steps between 1s and 0s and are therefore not continuous. Analogue waveforms are not. They are smooth continuous waves and can represent many voltage points at each millisecond, microsecond or nanosecond between the peaks and troughs. Outputs from ADCs (...


Only top voted, non community-wiki answers of a minimum length are eligible