Diff: read_filter_emg.h

Revision:

0:fc6fa085d591

Child:

1:5c1fc4e9401a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/read_filter_emg.h	Fri Oct 23 13:14:57 2015 +0000
@@ -0,0 +1,42 @@
+/*
+ * read_filter_emg.h
+ *
+ *  Created on: Oct 14, 2015
+ *      Author: User
+ */
+
+#ifndef READ_FILTER_EMG_H_
+#define READ_FILTER_EMG_H_
+
+class EMG {
+    public:
+		//create instance of the EMG class
+        EMG(PinName aI_, double &v1_, double &v2_);
+        double v1;
+		double v2;
+        double input_sample;
+        double filtered_sample;
+
+        //reads emg value and saves as input_sample
+        void sample();
+
+        /*general biquad function to be used in the filtering
+        biquad coefficients are in the filter functions */
+        double biquad(double u, double &v1, double &v2, const double a1,
+        		const double a2, const double b0, const double b1, const double b2);
+
+        //20 hz highpass filter contains 3 biquads. Returns filtered value
+        double highpass_filter(double hpInput);
+
+        //Rectify the input (take absolute value). Input is output of highpass
+        double rectify(double rcInput);
+
+        //6 hz low pass filter, contains 3 biquads, input output of rectify
+        double lowpass_filter(double lpInput);
+
+        //function containing all three filter steps. Input raw signal value, output is filtered envelope value
+        double filter(double input);
+};
+
+#endif /* READ_FILTER_EMG_H_ */
+