Bart Vaart / Mbed 2 deprecated EMGfilter

Filter emg 7-10-15 v1

Dependencies:   HIDScope mbed MODSERIAL

Filterdesigns.cpp@19:6c0245063b96, 2015-10-13 (annotated)

Committer:
Bartvaart
Date:
Tue Oct 13 12:28:32 2015 +0000
Revision:
19:6c0245063b96
Parent:
18:eec0880fcded
Child:
20:11e1244ad2ad
met extra filter voor trilling kabels;

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 19:6c0245063b96 21 // Notch 0-20Hz
Bartvaart 19:6c0245063b96 22
Bartvaart 19:6c0245063b96 23 // Filter2a: 0-20Hz Notch
Bartvaart 19:6c0245063b96 24 double v1_020a = 0, v2_020a = 0;
Bartvaart 19:6c0245063b96 25 const double a1_020a = -1.78180535801, a2_020a = 0.78747189013;
Bartvaart 19:6c0245063b96 26 const double b0_020a = 1.00000000000, b1_020a = -1.99365972450, b2_020a = 1.0;
Bartvaart 19:6c0245063b96 27 const double gain_020a = 0.893737;
Bartvaart 19:6c0245063b96 28
Bartvaart 19:6c0245063b96 29 // Filter2b: 0-20Hz Notch
Bartvaart 19:6c0245063b96 30 double v1_020b = 0, v2_020b = 0;
Bartvaart 19:6c0245063b96 31 const double a1_020b = -1.75020314275, a2_020b = 0.80725578229;
Bartvaart 19:6c0245063b96 32 const double b0_020b = 1.00000000000, b1_020b = -1.99365972450, b2_020b = 1.0;
Bartvaart 19:6c0245063b96 33 const double gain_020b = 0.890775;
Bartvaart 19:6c0245063b96 34
Bartvaart 19:6c0245063b96 35 // Filter2c: 0-20Hz Notch
Bartvaart 19:6c0245063b96 36 double v1_020c = 0, v2_020c = 0;
Bartvaart 19:6c0245063b96 37 const double a1_020c = -1.97815539898, a2_020c = 0.97877726519;
Bartvaart 19:6c0245063b96 38 const double b0_020c = 1.00000000000, b1_020c = -1.99365972450, b2_020c = 1.0;
Bartvaart 19:6c0245063b96 39 const double gain_020c = 0.990804;
Bartvaart 5:b400209df739 40
Bartvaart 13:b01231e0b743 41 //HighPass 20Hz
Bartvaart 13:b01231e0b743 42
Bartvaart 13:b01231e0b743 43 // Filter2a: 20Hz HighPass
Bartvaart 15:c1a8f28d6583 44 double v1_HP = 0, v2_HP = 0;
Bartvaart 15:c1a8f28d6583 45 const double a1_HP = 1.64732093404, a2_HP = 0.70900981120;
Bartvaart 15:c1a8f28d6583 46 const double b0_HP = 1.00000000000, b1_HP = 2.0, b2_HP = 1.00000000000;
Bartvaart 15:c1a8f28d6583 47 const double gain_HP = 0.84193;
Bartvaart 13:b01231e0b743 48
Bartvaart 6:8197f9446daf 49
Bartvaart 13:b01231e0b743 50 //LowPass 3Hz
Bartvaart 13:b01231e0b743 51
Bartvaart 13:b01231e0b743 52 // Filter3a: 3Hz LowPass
Bartvaart 15:c1a8f28d6583 53 double v1_LP = 0, v2_LP = 0;
Bartvaart 15:c1a8f28d6583 54 const double a1_LP = -1.93503824887, a2_LP = 0.93708289663;
Bartvaart 15:c1a8f28d6583 55 const double b0_LP = 1.00000000000, b1_LP = 2.0, b2_LP = 1.00000000000;
Bartvaart 15:c1a8f28d6583 56 const double gain_LP = 0.000511;
Bartvaart 6:8197f9446daf 57
Bartvaart 6:8197f9446daf 58 // constante variabelen:
Bartvaart 6:8197f9446daf 59
Bartvaart 19:6c0245063b96 60 double gem = 0.4557; // gemiddelde waarde emgsignaal
Bartvaart 6:8197f9446daf 61
Bartvaart 17:cfe44346645c 62 double y=0;
Bartvaart 6:8197f9446daf 63
Bartvaart 18:eec0880fcded 64 double Filterdesigns(double u, double ymin)
Bartvaart 5:b400209df739 65 {
Bartvaart 5:b400209df739 66 //u = input waarde
Bartvaart 5:b400209df739 67 //y = output waarde
Bartvaart 16:8f175d2a472f 68
Bartvaart 19:6c0245063b96 69 u = u - gem; // zorgen dat bij geen signaal u = 0
Bartvaart 16:8f175d2a472f 70
Bartvaart 5:b400209df739 71 // Op deze manier worden de waardes ingelezen in Filter. Zorg dus voor dezelfde volgorde, zodat de waardes goed uitgelezen worden!:
Bartvaart 5:b400209df739 72 // 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 73
Bartvaart 5:b400209df739 74 // 50Hz Notch filter
Bartvaart 5:b400209df739 75 double y50a = Filter(u, v1_50a, v2_50a, a1_50a, a2_50a, b0_50a, b1_50a, b2_50a, gain_50a);
Bartvaart 5:b400209df739 76 double y50b = Filter(y50a, v1_50b, v2_50b, a1_50b, a2_50b, b0_50b, b1_50b, b2_50b, gain_50b);
Bartvaart 6:8197f9446daf 77
Bartvaart 19:6c0245063b96 78 // 0-20Hz Notch filter
Bartvaart 19:6c0245063b96 79 double y020a = Filter(y50a, v1_020a, v2_020a, a1_020a, a2_020a, b0_020a, b1_020a, b2_020a, gain_020a);
Bartvaart 19:6c0245063b96 80 double y020b = Filter(y020a, v1_020b, v2_020b, a1_020b, a2_020b, b0_020b, b1_020b, b2_020b, gain_020b);
Bartvaart 19:6c0245063b96 81 double y020c = Filter(y020b, v1_020c, v2_020c, a1_020c, a2_020c, b0_020c, b1_020c, b2_020c, gain_020c);
Bartvaart 19:6c0245063b96 82
Bartvaart 19:6c0245063b96 83
Bartvaart 5:b400209df739 84 // High Pass filter. Tot 20Hz wordt weggefliterd
Bartvaart 15:c1a8f28d6583 85 double yHP = Filter(y50b, v1_HP, v2_HP, a1_HP, a2_HP, b0_HP, b1_HP, b2_HP, gain_HP);
Bartvaart 6:8197f9446daf 86
Bartvaart 5:b400209df739 87 // Absolute waarde wordt genomen.
Bartvaart 15:c1a8f28d6583 88 double y1 = fabs(yHP);
Bartvaart 6:8197f9446daf 89
Bartvaart 6:8197f9446daf 90 // Low Pass filter. Alles vanaf 5Hz wordt weggefilterd
Bartvaart 15:c1a8f28d6583 91 double yLP = Filter(y1, v1_LP, v2_LP, a1_LP, a2_LP, b0_LP, b1_LP, b2_LP, gain_LP);
Bartvaart 6:8197f9446daf 92
Bartvaart 16:8f175d2a472f 93 y = 10 * yLP;
Bartvaart 17:cfe44346645c 94
Bartvaart 17:cfe44346645c 95 return y;
Bartvaart 5:b400209df739 96 }