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--- visual3d:documentation:emg:filtering:integrate_emg [2024/06/19 12:47] – sgranger
+++ visual3d:documentation:emg:filtering:integrate_emg [2024/07/17 15:45] (current) – created sgranger
@@ Line 1: / Line 1: @@
-====== linear envelope ======
+====== Integrate EMG ======
-==== computing the emg envelope using rectify and lowpass filter ====
+===== Linear Envelope =====
-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))
+=== Computing the EMG Envelope using rectify and lowpass filter ===
-==== lowpass filter cutoff ====
+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))
-the default lowpass filter in visual3d is a fourth order butterworth filter.
+=== Lowpass Filter Cutoff ===
-butterworth filters have an upper limit on the magnitude of the cutoff frequency.
+The default lowpass filter in Visual3D is a fourth order butterworth filter.
-the maximum theoretical cutoff frequency is (sampling_rate*0.802/2).
+Butterworth filters have an upper limit on the magnitude of the cutoff frequency.
-visual3d is a little more conservative than that because we have found the filter to be unreliable at the theoretical limits.
+The maximum theoretical cutoff frequency is (sampling_rate*0.802/2).
-the highest cutoff frequency that visual3d will allow you is 0.393* sampling-rate.
+VIsual3D is a little more conservative than that because we have found the filter to be unreliable at the theoretical limits.
-if your emg signals are sampled at 1000 hz, the highest cutoff frequency is 393 hz.
+The highest cutoff frequency that VIsual3D will allow you is 0.393* sampling-rate.
-==== example script ====
+If your EMG signals are sampled at 1000 Hz, the highest cutoff frequency is 393 Hz.
-the highpass filter is not part of the linear envelope, but is used to remove the [[visual3d:documentation:emg:processing:detecting_muscle_onset|dc offset]].
+=== Example Script ===
+The highpass filter is not part of the linear envelope, but is used to remove the [[Visual3D:Documentation:EMG:Processing:Detecting_Muscle_Onset|DC offset]].
 <code>
-! apply high pass filter with 50 hz cutoff
+! Apply high pass filter with 50 hz cutoff
-highpass_filter
+Highpass_Filter
-/signal_types=analog
+/Signal_Types=ANALOG
-/signal_names=emg1+emg2+emg3
+/SIgnal_Names=EMG1+EMG2+EMG3
-/signal_folder=original
+/Signal_Folder=ORIGINAL
-! /result_suffix=
+! /Result_Suffix=
-/result_folder=highpass
+/Result_Folder=HIGHPASS
-! /filter_class=butterworth
+! /Filter_Class=BUTTERWORTH
-/frequency_cutoff=50
+/Frequency_Cutoff=50
-/num_reflected= 0
+/Num_Reflected= 0
-/total_buffer_size=100
+/Total_Buffer_Size=100
-/num_bidirectional_passes=1
+/Num_Bidirectional_Passes=1
 ;
-! rectify the signals
+! Rectify the signals
-rectify
+Rectify
-/signal_types=analog
+/SIGNAL_TYPES=ANALOG
-/signal_names=emg1+emg2+emg3
+/SIGNAL_NAMES=EMG1+EMG2+EMG3
-/signal_folder=highpass
+/SIGNAL_FOLDER=HIGHPASS
-! /result_names=
+! /RESULT_NAMES=
-! /result_types=
+! /RESULT_TYPES=
-/result_folder=rectify
+/RESULT_FOLDER=RECTIFY
-! /result_suffix=
+! /RESULT_SUFFIX=
 ;
-! apply a low pass filter
+! Apply a low pass filter
-lowpass_filter
+Lowpass_Filter
-/signal_types= analog
+/Signal_Types= ANALOG
-/signal_names= emg1+emg2+emg3
+/Signal_Names= EMG1+EMG2+EMG3
-/signal_folder= rectify
+/Signal_Folder= RECTIFY
-! /result_suffix=
+! /Result_Suffix=
-/result_folder=lowpass
+/Result_Folder=LOWPASS
-/frequency_cutoff=10
+/Frequency_Cutoff=10
-/num_reflected=50
+/Num_Reflected=50
 ;
 </code>