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--- visual3d:documentation:emg:processing:detecting_muscle_onset [2024/06/14 17:14] – removed sgranger
+++ visual3d:documentation:emg:processing:detecting_muscle_onset [2024/07/17 15:45] (current) – created sgranger
@@ Line 1: / Line 1: @@
+====== Detecting Muscle Onset ======
+||
+Surface EMG signals typically have a frequency content between 50 and 500 Hz. These signals may have a DC bias. It is common to apply a high pass filter with a cutoff frequency of 50 Hz to EMG signals prior to any other processing to remove the DC bias.
+**Note: Many laboratories assume a frequency content between 20 and 500 Hz**
+**Note: Applying a high pass filter will effectively remove any DC bias in the signal.**
+<code>
+! By default, Visual3D uses a second order Butterworth Bidirectional Filter (resulting in a
+! fourth order filter) for Lowpass/Highpass filtering.
+! High pass filter
+Highpass_Filter
+/Signal_Types= ANALOG
+/SIgnal_Names= EMG1+EMG2+EMG3
+/Signal_Folder= ORIGINAL
+! /Result_Suffix=
+! /Result_Folder=PROCESSED
+! /Filter_Class=BUTTERWORTH
+/Frequency_Cutoff= 50
+/Num_Reflected= 0
+/Total_Buffer_Size=100
+/Num_Bidirectional_Passes=1
+;
+</code>