====== EMG Envelope ======

**If you are using a version of Visual3D older than 4.94, you will need to use the following commands to specify the frame window in seconds (as opposed to frames).**

<code>
! -------------------------------------------
! apply a bandpass filter to the EMG signals
! -------------------------------------------
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
;

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
;

! -------------------------------------------
! copy the analog rate from the c3d parameter
! to a metric value
! -------------------------------------------

Metric_From_Parameter
/METRIC_NAME=ANALOG_RATE
/PARAMETER_GROUP=ANALOG
/PARAMETER_NAME=RATE
;

! -------------------------------------------
! compute the number of frames equivalent to
! a 100 ms window
! -------------------------------------------

Evaluate_Expression
/EXPRESSION=1+0.1*METRIC::PROCESSED::ANALOG_RATE
/RESULT_NAME=RMS_FRAMES
/RESULT_TYPE=METRIC
! /RESULT_FOLDER=PROCESSED
;

! -------------------------------------------
! create a pipeline parameter of the RMS window
! ------------------------------------------- 

Set_Pipeline_Parameter_To_Data_Value
/PARAMETER_NAME=RMS_FRAMES
/SIGNAL_TYPES=METRIC
/SIGNAL_NAMES=RMS_FRAMES
/SIGNAL_FOLDER=PROCESSED
;

! --------------------------------------------
! compute a moving rms with a window of 100 ms
! --------------------------------------------

Moving_RMS
/SIGNAL_TYPES=ANALOG
/SIGNAL_NAMES=EMG1+EMG2+EMG3
/SIGNAL_FOLDER=PROCESSED
! /RESULT_SUFFIX=
/RESULT_FOLDER=RMS
/NUM_WINDOW_FRAMES=::RMS_FRAMES
;
</code>