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--- visual3d:documentation:emg:processing:normalize_emg_to_maximum_30_second_interval [2024/06/14 17:11] – created sgranger
+++ visual3d:documentation:emg:processing:normalize_emg_to_maximum_30_second_interval [2024/07/17 15:45] (current) – created sgranger
@@ Line 1: / Line 1: @@
-|**Language:**|** English**  • [[index.php?title=EMG_Compute_Normalization_Scale_Factors/fr&action=edit&redlink=1|français]] • [[index.php?title=EMG_Compute_Normalization_Scale_Factors/it&action=edit&redlink=1|italiano]] • [[EMG_Compute_Normalization_Scale_Factors/pt|português]] • [[index.php?title=EMG_Compute_Normalization_Scale_Factors/es&action=edit&redlink=1|español]] ****|
+====== Normalize EMG to Maximum 30 second interval ======
-|===== Contents =====\\ \\ \\ \\ * [[#Background|1 Background]]\\ * [[#Examples|2 Examples]]\\   * [[#Example_1:_Single_MVC_Trial|2.1 Example 1: Single MVC Trial]]\\     * [[#Download|2.1.1 Download]]\\   * [[#Example_2:_Multiple_MVC_Trials|2.2 Example 2: Multiple MVC Trials]]\\     * [[#Download_2|2.2.1 Download]]|
+This page shows an example of processing EMG data using the Root Mean Square (RMS) Amplitude Method.
-====== Background ======
+==== Using the Moving_RMS Command ====
-Normalize to greatest ½ second activity during 5 second trial. A window of twenty-five .02 second intervals of integrated EMG is moved one interval at a time across the 5 seconds of data to find the greatest EMG. The average integrated EMG during the ½ second is used to compute the normalization factor.
+=== Moving RMS using Frame Window ===
-This is just an example, so the user should modify the meta-command to suit their own needs.
+For example the command below applies the moving RMS with a 51 frame window:
-The task is as follows:
+<code>
+Moving_RMS
+/Signal_Types=ANALOG
+/Signal_Names=EMG1+EMG2+EMG3
+/Signal_Folder=PROCESSED
+/Num_Window_Frames= 51
+;
+</code>
-  * Compute a normalization factor
+=== Moving RMS using Time Window ===
-  * Normalize to greatest ½ second during 5 second trial.\\
-This is accomplished by using an average filter (see the bottom of the page)
-  * A window of twenty-five .02 second intervals of integrated EMG is moved one interval at a time across the 5 seconds of data to find the greatest EMG.
-  * The average integrated EMG during the ½ second is used to compute the normalization factor.
-\\
+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:
-====== Examples ======
+<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>
-The following are examples of how to do the above task. The maximum value is calculated is a little different in the following examples. You should choose the method which makes the most sense to you.
+==== Using the Moving_RMS Command to Process EMG Data ====
-===== Example 1: Single MVC Trial =====
+An example of "putting it all together". First the signal is Highpass filtered to remove the DC offset, then lowpass filtered and finally rectified:
-  - Process EMG
+<code>
-    - High pass filter (remove DC offset)
+! Apply a high pass filter with 50 Hz cutoff
-    - Calculate RMS of predetermined time intervals (example: 0.02 seconds)
+Highpass_Filter
-  - Normalize
+/Signal_Types=ANALOG
-    - Calculate the average of the processed signal over 30 second intervals
+/SIgnal_Names=EMG1+EMG2+EMG3
-    - Get the maximum of the 30 second interval
+/Signal_Folder=ORIGINAL
-    - Normalize by dividing the average by the maximum
+! /Result_Suffix=
+! /Result_Folder=PROCESSED
+! /Filter_Class=BUTTERWORTH
+/Frequency_Cutoff= 50
+/Num_Reflected= 0
+/Total_Buffer_Size=100
+/Num_Bidirectional_Passes=1
+;
-==== Download ====
+! 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>
-[[https://www.has-motion.com/download/examples/EMG/MVC_Trial_Max_Mean_Example_2.zip|You can download the sample files here.]]
+[[Visual3D:Documentation:EMG:Filtering:EMG_Envelope|If you are using a version of Visual3D older than 4.94, you can use the example here.]]
-The download contains:
-  * MVC_Example.cmz with -
-    * 3 MVC trial
-    * 2 Dynamic Trials
-  * EMG_Norm_MVC_Max_Mean_Example_1.v3s (Example Pipeline Script)
-  * EMG_Norm_MVC_Max_Mean_Example_1.v3m (Example Meta-Command)
-  * Call_EMG_Norm_MVC_Max_Mean_Example_1_Meta.v3s (Example Pipeline Script calling Meta-Command)
-===== Example 2: Multiple MVC Trials =====
-  - Process EMG
-    - High pass filter (remove DC offset)
-    - Calculate RMS of predetermined time intervals (example: 0.02 seconds)
-  - Normalize
-    - Calculate the average of the processed signal over some time interval (in this example: 0.5 seconds)
-    - Get the maximum of the processed signal
-    - Calculate the maximum of the average signal
-    - Normalize by dividing the processed signal by the maximum average over the interval
-==== Download ====
-[[https://www.has-motion.com/download/examples/EMG/MVC_Trial_Max_Mean_Example_1.zip|You can download the sample files here.]]
-The download contains:
-  * MVC_Example.cmz with -
-    * 3 MVC trial
-    * 2 Dynamic Trials
-  * EMG_Norm_MVC_Max_Mean_Example_1.v3s (Example Pipeline Script)
-  * EMG_Norm_MVC_Max_Mean_Example_1.v3m (Example Meta-Command)
-  * Call_EMG_Norm_MVC_Max_Mean_Example_1_Meta.v3s (Example Pipeline Script calling Meta-Command)
-Retrieved from ""