Revision 2:1d29b91bc46a, committed 2015-10-26

Comitter:

roosbulthuis

Date:

Mon Oct 26 15:00:52 2015 +0000

Parent:

1:f32f8eac8af1

Child:

3:7cb317c00afb

Commit message:

Got rid of pass by reference for v1 and v2, now we get a signal if we plot the filtered signal in channel 0.

Changed in this revision

--- a/main.cpp	Mon Oct 26 14:45:46 2015 +0000
+++ b/main.cpp	Mon Oct 26 15:00:52 2015 +0000
@@ -21,7 +21,7 @@
 double filter_right;
 
 //general biquad filter that can be called in all the filter functions
-double biquad(double u, double &v1, double &v2, const double a1,
+double biquad(double u, double v1, double v2, const double a1,
               const double a2, const double b0, const double b1, const double b2)
 {
     double v = u - a1*v1 - a2*v2;
@@ -90,7 +90,7 @@
 
 //highpass
 
-double highpass_filter(double input, double &v1, double &v2)
+double highpass_filter(double input, double v1, double v2)
 {
     double y1 = biquad(input, v1, v2, highp1_a1, highp1_a2, highp1_b0, highp1_b1, highp1_b2);
     double y2 = biquad(y1, v1, v2, highp2_a1, highp2_a2, highp2_b0, highp2_b1, highp2_b2);
@@ -109,7 +109,7 @@
 
 //lowpass
 
-double lowpass_filter(double y3, double &v1, double &v2)
+double lowpass_filter(double y3, double v1, double v2)
 {
     double y4 = biquad(y3, v1, v2, lowp1_a1, lowp1_a2, lowp1_b0, lowp1_b1, lowp1_b2);
     double y5 = biquad(y4, v1, v2, lowp2_a1, lowp2_a2, lowp2_b0, lowp2_b1, lowp2_b2);
@@ -118,7 +118,7 @@
     return filtered_signal;
 }
 
-double filter(double input, double &v1, double &v2)
+double filter(double input, double v1, double v2)
 {
     /* function passes the input through the three filters
     returns the final output value as filtered sample