werkend filter: 50 hz notch 20 hz hoogdoorlaat 80 hz laagdoorlaat geabsoluteerd vermenigvuldigd met 10
Dependencies: HIDScope mbed-dsp mbed
Fork of Project5-filtering2 by
Diff: main.cpp
- Revision:
- 12:8a30e43337bb
- Parent:
- 11:a598cb27907f
- Child:
- 13:1f0ac2425368
--- a/main.cpp Thu Oct 16 09:47:54 2014 +0000 +++ b/main.cpp Thu Oct 16 10:11:07 2014 +0000 @@ -25,9 +25,14 @@ float notch_states[4]; arm_biquad_casd_df1_inst_f32 highpass; //constants for 5Hz highpass -float highpass_const[] = {0.8948577513857248, -1.7897155027714495, 0.8948577513857248, 0.8008009266036016}; +float highpass_const[] = {0.8948577513857248, -1.7897155027714495, 0.8948577513857248, -1.7786300789392977, 0.8008009266036016}; //state values float highpass_states[4]; +//constants for 80Hz lowpass +arm_biquad_casd_df1_inst_f32 lowpass; +float lowpass_const[] = {0.6389437261127493, 1.2778874522254986, 0.6389437261127493, 1.1429772843080919, 0.41279762014290533}; +//state values +float lowpass_states[4]; void looper() @@ -39,6 +44,7 @@ float filtered_emg_abs; float filtered_emg_env; float emg_value_f32; + float filtered_emg_lowpass; /*put raw emg value both in red and in emg_value*/ emg_value = emg0.read_u16(); // read direct ADC result, converted to 16 bit integer (0..2^16 = 0..65536 = 0..3.3V) emg_value_f32 = emg0.read(); @@ -46,14 +52,15 @@ //process emg arm_biquad_cascade_df1_f32(&highpass, &emg_value_f32, &filtered_emg, 1 ); arm_biquad_cascade_df1_f32(¬ch, &filtered_emg, &filtered_emg_notch, 1 ); - filtered_emg_abs = fabs(filtered_emg_notch); + arm_biquad_cascade_df1_f32(¬ch, &filtered_emg_notch, &filtered_emg_lowpass, 1 ); + filtered_emg_abs = fabs(filtered_emg_lowpass); scope.set(0,emg_value); //uint value scope.set(1,filtered_emg); //processed float scope.set(2,filtered_emg_notch); scope.set(3,filtered_emg_abs); - scope.set(4,avg1); + scope.set(4,filtered_emg_lowpass); scope.send(); } @@ -63,6 +70,7 @@ //set up filters. Use external array for constants arm_biquad_cascade_df1_init_f32(¬ch,1 , notch_const, notch_states); arm_biquad_cascade_df1_init_f32(&highpass,1 ,highpass_const,highpass_states); + arm_biquad_cascade_df1_init_f32(&lowpass,1 ,lowpass_const,lowpass_states); log_timer.attach(looper, 0.005); while(1) //Loop