Laura Heus / Mbed 2 deprecated EMGmeten_2

Bandpass, notch, abs en laagdoorlaat 3H

Dependencies:   HIDScope MODSERIAL TextLCD mbed-dsp mbed

Fork of EMGmeten by Laura Heus

Files at this revision

API Documentation at this revision

Revision 1:b7a9fcf50776, committed 2014-10-28

Comitter:
lauradeheus
Date:
Tue Oct 28 14:37:59 2014 +0000
Parent:
0:b68a6d0451b8
Child:
2:5d64e4c95f5c
Commit message:
Bandpass and rectifying correct

Changed in this revision

EMGmeten.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/EMGmeten.cpp	Tue Oct 28 14:23:05 2014 +0000
+++ b/EMGmeten.cpp	Tue Oct 28 14:37:59 2014 +0000
@@ -6,11 +6,14 @@
 AnalogIn    emg(PTB1); //Analog input
 HIDScope scope(2);
 
-arm_biquad_casd_df1_inst_f32 lowpass;
-arm_biquad_casd_df1_inst_f32 highpass; 
-float lowpass_const[] = {0.978030479206560 , 1.956060958413119  , 0.978030479206560 , -1.955578240315036 , -0.956543676511203};
-float lowpass_states[4];
-float highpass_const[] = {0.638945525159022, -1.277891050318045,  0.638945525159022 , 1.142980502539901 , -0.412801598096189};
+arm_biquad_casd_df1_inst_f32 lowpass_1; //99Hz
+arm_biquad_casd_df1_inst_f32 lowpass_2; //3Hz
+arm_biquad_casd_df1_inst_f32 highpass; //20Hz
+float lowpass_1_const[] = {0.978030479206560 , 1.956060958413119 , 0.978030479206560 , -1.955578240315036 , -0.956543676511203};
+float lowpass_1_states[4];
+float lowpass_2_const[] = {0.002080567135492 , 0.004161134270985 , 0.002080567135492 , 1.866892279711715 , 0.875214548253684};
+float lowpass_2_states[4];
+float highpass_const[] = {0.638945525159022 , -1.277891050318045 ,  0.638945525159022 , 1.142980502539901 , -0.412801598096189};
 float highpass_states[4];
 
 void looper()
@@ -22,7 +25,9 @@
     emg_value_f32 = emg.read();
     
     arm_biquad_cascade_df1_f32(&highpass, &emg_value_f32, &filtered_emg, 1 );
-    arm_biquad_cascade_df1_f32(&lowpass, &filtered_emg, &filtered_emg, 1 );
+    arm_biquad_cascade_df1_f32(&lowpass_1, &filtered_emg, &filtered_emg, 1 );
+    filtered_emg = fabs(filtered_emg);
+    //arm_biquad_cascade_df1_f32(&lowpass_2, &filtered_emg, &filtered_emg, 1 );
     
     scope.set(0,emg_value);     //uint value
     scope.set(1,filtered_emg);  //processed float
@@ -33,8 +38,9 @@
 {
     Ticker log_timer;
     
-    arm_biquad_cascade_df1_init_f32(&lowpass,1 , lowpass_const, lowpass_states);
+    arm_biquad_cascade_df1_init_f32(&lowpass_1,1 , lowpass_1_const, lowpass_1_states);
     arm_biquad_cascade_df1_init_f32(&highpass,1 , highpass_const, highpass_states);
+    //arm_biquad_cascade_df1_init_f32(&lowpass_2,1 , lowpass_2_const, lowpass_2_states);
     
     log_timer.attach(looper, 0.005);