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Published online 2012 May 28. doi: 10.1186/1743-0003-9-29

Figure 3

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Example of raw data overlaid with a linear envelope. Myoelectric activity of the Tibialis Anterior is shown for one gait cycle. The raw signal seen in the blue line represents rectified myoelectric activity that has been initially filtered through the hardware band-pass filter (10-500 Hz) and full-wave rectified. The overlaid signal in black represents the linear envelope signal, filtered through the following steps: (1) High pass filter (50 Hz) to remove motion artifact, (2) Notch filter (59.5-60.5) to remove ambient power line noise, (3) Full-Wave Rectification, (4) Low pass filter (8 Hz) to smooth the final signal.

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