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![Signal Acquisition [OpenSignals]](https://plux.info/1123-large_default/digital-filtering-pre-process-step.jpg "Signal Acquisition [OpenSignals]")
![Signal Acquisition [OpenSignals]](https://plux.info/1123-thickbox_default/digital-filtering-pre-process-step.jpg "Signal Acquisition [OpenSignals]")
NB-PP-01
In this Jupyter Notebook it will be demonstrated how to digital filter the signal.
Digital Filtering - A Fundamental Pre-Processing Step
In this Jupyter Notebook it will be demonstrated how to digital filter the signal.
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![Signal Acquisition [OpenSignals]](https://plux.info/1125-home_default/fatigue-evaluation-evolution-of-median-power-frequency.jpg "Signal Acquisition [OpenSignals]")
Raw data contained in the generated .txt, .h5 and .edf files consists in samples and each sample value is in a raw value with 8 or 16 bits that needs to be converted to a physical unit by the respective transfer function.
In spite of the unit conversion procedure has some common steps applicable to all sensors, the current Jupyter Notebook is dedicated to the unit conversion procedure of signals acquired with ECG sensor.
![Signal Acquisition [OpenSignals]](https://plux.info/1131-home_default/event-detection-muscular-activations-emg.jpg "Signal Acquisition [OpenSignals]")
In this Jupyter Notebook it will be presented a single threshold algorithm, that includes the Teager-Kaiser Energy Operator (TKEO) in his implementation.
![Signal Acquisition [OpenSignals]](https://plux.info/1124-home_default/fatigue-evaluation-evolution-of-median-power-frequency.jpg "Signal Acquisition [OpenSignals]")
In this Jupyter Notebook it will be presented the basic methodology to monitoring the fatigue along time.