Diff: EMG.cpp

Revision:

4:38c653bfec5f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/EMG.cpp	Mon Oct 16 12:34:11 2017 +0000
@@ -0,0 +1,75 @@
+#include "EMG.h"
+#include"BiQuad.h"
+
+EMG::EMG(PinName data) : _data(data)
+{
+    cntr = 0;
+}
+
+
+double EMG::get_notch(double data){
+    
+    double a0=1,                        a1=-1.525271192436899,          a2=0.881618592363190,
+       b0=0.940809296181595,        b1=-1.525271192436899,          b2=0.940809296181595;
+           
+    BiQuad MainsReject(b0, b1, b2, a0, a1, a2);
+    
+    return MainsReject.step(data);
+    
+}
+    
+    
+double EMG::get_noise(double data){
+   
+   double a0=1,                        a1=-0.671029090774096,          a2=0.252324626282266,
+       b0=0.145323883877042,        b1= 0.290647767754085,          b2= 0.145323883877042;
+           
+    BiQuad Low_pass(b0, b1, b2, a0, a1, a2);
+    
+    return Low_pass.step(data);
+}
+    
+    
+double EMG::get_DC(double data){
+    
+    double a_0_0=1,                        a_0_1=-1.475480443592646,          a_0_2=0.586919508061190,
+       b_0_0=0.765599987913459,        b_0_1=-1.531199975826918,          b_0_2=0.765599987913459;
+           
+    BiQuad HiPass(b_0_0, b_0_1, b_0_2, a_0_0, a_0_1, a_0_2);
+    
+    return HiPass.step(data);
+    
+}
+    
+    
+double EMG::get_absolute(double data){
+    
+    return abs(data);
+    
+    
+}
+    
+    
+double EMG::get_envelope(double data){
+    
+    double a_1_0=1,                        a_1_1=-1.982228929792529,          a_1_2=0.982385450614126,
+       b_1_0=0.00003913020539916823,    b_1_1=0.00007826041079833645,           b_1_2=0.00003913020539916823;
+           
+    BiQuad LoPass(b_1_0, b_1_1, b_1_2, a_1_0, a_1_1, a_1_2);
+    
+    return LoPass.step(data);
+}
+    
+double EMG::filter_emg(double data){
+    
+    if(cntr<=500)
+    {
+        cntr++;
+        return 0;
+    }
+    else
+    {
+        return get_envelope(get_absolute(get_DC(get_notch(get_noise(data)))));
+    }
+    
+}
\ No newline at end of file