File content as of revision 6:452e301a105a:

#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(){
    
    if(cntr<=500)
    {
        cntr++;
        return 0;
    }
    else
    {
        return get_envelope(get_absolute(get_DC(get_notch(get_noise(_data)))));
    }
    
}