Differences

This shows you the differences between two versions of the page.

--- visual3d:documentation:emg:processing:normalize_emg_to_maximum_30_second_interval [2024/06/17 17:04] – removed sgranger
+++ visual3d:documentation:emg:processing:normalize_emg_to_maximum_30_second_interval [2024/07/17 15:45] (current) – created sgranger
@@ Line 1: / Line 1: @@
+====== Normalize EMG to Maximum 30 second interval ======
+This page shows an example of processing EMG data using the Root Mean Square (RMS) Amplitude Method.
+==== Using the Moving_RMS Command ====
+=== Moving RMS using Frame Window ===
+For example the command below applies the moving RMS with a 51 frame window:
+<code>
+Moving_RMS
+/Signal_Types=ANALOG
+/Signal_Names=EMG1+EMG2+EMG3
+/Signal_Folder=PROCESSED
+/Num_Window_Frames= 51
+;
+</code>
+=== Moving RMS using Time Window ===
+When reporting RMS, it's typically stated as an RMS window over a specified time interval of T.
+An example of running an RMS over a 100 ms (0.1 seconds) window is achieved as:
+<code>
+! Moving RMS with 100ms window
+Moving_RMS
+/SIGNAL_TYPES=ANALOG
+/SIGNAL_NAMES=EMG1+EMG2+EMG3
+/SIGNAL_FOLDER=PROCESSED
+! /RESULT_SUFFIX=
+/RESULT_FOLDER=RMS
+/NUM_WINDOW_FRAMES= ( 0.1*PARAMETER::ANALOG::RATE ) + 1
+;
+</code>
+==== Using the Moving_RMS Command to Process EMG Data ====
+An example of "putting it all together". First the signal is Highpass filtered to remove the DC offset, then lowpass filtered and finally rectified:
+<code>
+! Apply a high pass filter with 50 Hz cutoff
+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
+;
+! Apply a low pass filter with 500 Hz cutoff
+Lowpass_Filter
+/Signal_Types=ANALOG
+/SIgnal_Names=EMG1+EMG2+EMG3
+/Signal_Folder=PROCESSED
+! /Result_Suffix=
+! /Result_Folder=PROCESSED
+! /Filter_Class=BUTTERWORTH
+/Frequency_Cutoff= 500
+/Num_Reflected= 0
+/Total_Buffer_Size=100
+/Num_Bidirectional_Passes=1
+;
+! Moving RMS with 100ms window
+Moving_RMS
+/SIGNAL_TYPES=ANALOG
+/SIGNAL_NAMES=EMG1+EMG2+EMG3
+/SIGNAL_FOLDER=PROCESSED
+! /RESULT_SUFFIX=
+/RESULT_FOLDER=RMS
+/NUM_WINDOW_FRAMES= ( 0.1*PARAMETER::ANALOG::RATE ) + 1
+;
+</code>
+[[Visual3D:Documentation:EMG:Filtering:EMG_Envelope|If you are using a version of Visual3D older than 4.94, you can use the example here.]]