visual3d:documentation:emg:filtering:integrate_emg
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visual3d:documentation:emg:filtering:integrate_emg [2024/06/17 18:15] – created sgranger | visual3d:documentation:emg:filtering:integrate_emg [2024/07/17 15:45] (current) – created sgranger | ||
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+ | ====== Integrate EMG ====== | ||
+ | ===== Linear Envelope ===== | ||
- | + | === Computing the EMG Envelope using rectify and lowpass filter === | |
- | + | ||
- | ====== Linear Envelope ====== | + | |
- | + | ||
- | ==== Computing the EMG Envelope using rectify and lowpass filter | + | |
This section will compute the EMG Envelope using rectify and lowpass filter. Rectify takes the absolute value of every element of a signal. Visual3D calculates signal rectification using the following formula: x(ti)= abs(x(ti)) | This section will compute the EMG Envelope using rectify and lowpass filter. Rectify takes the absolute value of every element of a signal. Visual3D calculates signal rectification using the following formula: x(ti)= abs(x(ti)) | ||
- | ==== Lowpass Filter Cutoff | + | === Lowpass Filter Cutoff === |
The default lowpass filter in Visual3D is a fourth order butterworth filter. | The default lowpass filter in Visual3D is a fourth order butterworth filter. | ||
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If your EMG signals are sampled at 1000 Hz, the highest cutoff frequency is 393 Hz. | If your EMG signals are sampled at 1000 Hz, the highest cutoff frequency is 393 Hz. | ||
- | ==== Example Script | + | === Example Script === |
The highpass filter is not part of the linear envelope, but is used to remove the [[Visual3D: | The highpass filter is not part of the linear envelope, but is used to remove the [[Visual3D: | ||
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visual3d/documentation/emg/filtering/integrate_emg.1718648147.txt.gz · Last modified: 2024/06/17 18:15 by sgranger