Bart Vaart / Mbed 2 deprecated EMGfilter

Filter emg 7-10-15 v1

Dependencies:   HIDScope mbed MODSERIAL

Filterdesigns.cpp@18:eec0880fcded, 2015-10-12 (annotated)

Committer:
Bartvaart
Date:
Mon Oct 12 10:14:18 2015 +0000
Revision:
18:eec0880fcded
Parent:
17:cfe44346645c
Child:
19:6c0245063b96
Lijkt te werken, moet nog getest worden met echte metingen

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Bartvaart 5:b400209df739 1 #include "Filterdesigns.h"
Bartvaart 6:8197f9446daf 2 #include "Filter.h"
Bartvaart 6:8197f9446daf 3
Bartvaart 7:040591b3f019 4 // Inputwaardes
Bartvaart 13:b01231e0b743 5
Bartvaart 13:b01231e0b743 6
Bartvaart 13:b01231e0b743 7 //Notch 50Hz
Bartvaart 13:b01231e0b743 8
Bartvaart 7:040591b3f019 9 // Filter1a: 50Hz Notch
Bartvaart 6:8197f9446daf 10 double v1_50a = 0, v2_50a = 0;
Bartvaart 15:c1a8f28d6583 11 const double a1_50a = -1.52337295428, a2_50a = 0.93195385841;
Bartvaart 15:c1a8f28d6583 12 const double b0_50a = 1.00000000000, b1_50a = -1.61854514929, b2_50a = 1.0;
Bartvaart 6:8197f9446daf 13 const double gain_50a = 1.000000;
Bartvaart 6:8197f9446daf 14
Bartvaart 6:8197f9446daf 15 // Filter1b: 50Hz Notch
Bartvaart 6:8197f9446daf 16 double v1_50b = 0, v2_50b = 0;
Bartvaart 15:c1a8f28d6583 17 const double a1_50b = -1.60486796113, a2_50b = 0.93780356783;
Bartvaart 15:c1a8f28d6583 18 const double b0_50b = 1.00000000000, b1_50b = -1.61854514929, b2_50b = 1.0;
Bartvaart 15:c1a8f28d6583 19 const double gain_50b = 0.934872;
Bartvaart 6:8197f9446daf 20
Bartvaart 5:b400209df739 21
Bartvaart 13:b01231e0b743 22 //HighPass 20Hz
Bartvaart 13:b01231e0b743 23
Bartvaart 13:b01231e0b743 24 // Filter2a: 20Hz HighPass
Bartvaart 15:c1a8f28d6583 25 double v1_HP = 0, v2_HP = 0;
Bartvaart 15:c1a8f28d6583 26 const double a1_HP = 1.64732093404, a2_HP = 0.70900981120;
Bartvaart 15:c1a8f28d6583 27 const double b0_HP = 1.00000000000, b1_HP = 2.0, b2_HP = 1.00000000000;
Bartvaart 15:c1a8f28d6583 28 const double gain_HP = 0.84193;
Bartvaart 13:b01231e0b743 29
Bartvaart 6:8197f9446daf 30
Bartvaart 13:b01231e0b743 31 //LowPass 3Hz
Bartvaart 13:b01231e0b743 32
Bartvaart 13:b01231e0b743 33 // Filter3a: 3Hz LowPass
Bartvaart 15:c1a8f28d6583 34 double v1_LP = 0, v2_LP = 0;
Bartvaart 15:c1a8f28d6583 35 const double a1_LP = -1.93503824887, a2_LP = 0.93708289663;
Bartvaart 15:c1a8f28d6583 36 const double b0_LP = 1.00000000000, b1_LP = 2.0, b2_LP = 1.00000000000;
Bartvaart 15:c1a8f28d6583 37 const double gain_LP = 0.000511;
Bartvaart 6:8197f9446daf 38
Bartvaart 6:8197f9446daf 39 // constante variabelen:
Bartvaart 6:8197f9446daf 40
Bartvaart 18:eec0880fcded 41 //double gem = 0.4557; // gemiddelde waarde emgsignaal
Bartvaart 6:8197f9446daf 42
Bartvaart 17:cfe44346645c 43 double y=0;
Bartvaart 6:8197f9446daf 44
Bartvaart 18:eec0880fcded 45 double Filterdesigns(double u, double ymin)
Bartvaart 5:b400209df739 46 {
Bartvaart 5:b400209df739 47 //u = input waarde
Bartvaart 5:b400209df739 48 //y = output waarde
Bartvaart 16:8f175d2a472f 49
Bartvaart 18:eec0880fcded 50 u = u - ymin; // zorgen dat bij geen signaal u = 0
Bartvaart 16:8f175d2a472f 51
Bartvaart 5:b400209df739 52 // Op deze manier worden de waardes ingelezen in Filter. Zorg dus voor dezelfde volgorde, zodat de waardes goed uitgelezen worden!:
Bartvaart 5:b400209df739 53 // Filter(double u, double &v1, double &v2, const double a1, const double a2, const double b0, const double b1, const double b2, const double gain)
Bartvaart 6:8197f9446daf 54
Bartvaart 5:b400209df739 55 // 50Hz Notch filter
Bartvaart 5:b400209df739 56 double y50a = Filter(u, v1_50a, v2_50a, a1_50a, a2_50a, b0_50a, b1_50a, b2_50a, gain_50a);
Bartvaart 5:b400209df739 57 double y50b = Filter(y50a, v1_50b, v2_50b, a1_50b, a2_50b, b0_50b, b1_50b, b2_50b, gain_50b);
Bartvaart 6:8197f9446daf 58
Bartvaart 5:b400209df739 59 // High Pass filter. Tot 20Hz wordt weggefliterd
Bartvaart 15:c1a8f28d6583 60 double yHP = Filter(y50b, v1_HP, v2_HP, a1_HP, a2_HP, b0_HP, b1_HP, b2_HP, gain_HP);
Bartvaart 6:8197f9446daf 61
Bartvaart 5:b400209df739 62 // Absolute waarde wordt genomen.
Bartvaart 15:c1a8f28d6583 63 double y1 = fabs(yHP);
Bartvaart 6:8197f9446daf 64
Bartvaart 6:8197f9446daf 65 // Low Pass filter. Alles vanaf 5Hz wordt weggefilterd
Bartvaart 15:c1a8f28d6583 66 double yLP = Filter(y1, v1_LP, v2_LP, a1_LP, a2_LP, b0_LP, b1_LP, b2_LP, gain_LP);
Bartvaart 6:8197f9446daf 67
Bartvaart 16:8f175d2a472f 68 y = 10 * yLP;
Bartvaart 17:cfe44346645c 69
Bartvaart 17:cfe44346645c 70 return y;
Bartvaart 5:b400209df739 71 }