Revision 0:66d8d7360022, committed 2018-06-26

Comitter:

k0050288

Date:

Tue Jun 26 06:27:08 2018 +0000

Commit message:

??????

Changed in this revision

diff -r 000000000000 -r 66d8d7360022 sinc.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sinc.cpp	Tue Jun 26 06:27:08 2018 +0000
@@ -0,0 +1,33 @@
+/*
+* うなりを生成する
+*/
+#include "sinc.h"
+
+#define M_PI 3.141592653589793
+
+sinc::sinc()
+{
+    
+}
+
+void sinc::init()
+{
+    generate();
+}
+
+void sinc::generate()
+{
+    //int    fre_1 = 39750;
+    //int    fre_2 = 40250;
+    int    fre_1 = 39750;
+    int    fre_2 = 40250;
+    
+    double changeToLSB   = 4096 / 3.3;                    // 1LSB = 0.80566mV (12bit)
+    
+    for(int i = 0; i < BUFFER_SIZE; i++) {
+        double ome_1 = 2 * M_PI * fre_1 * (i + BUFFER_SIZE)/(BUFFER_SIZE*1000/2);  // omega_1 = 2*pi*f_1
+        double ome_2 = 2 * M_PI * fre_2 * (i + BUFFER_SIZE)/(BUFFER_SIZE*1000/2);  // omega_2 = 2*pi*f_2
+        // 0 ~ 4095
+        buffer[i] = (uint16_t)(changeToLSB * (AMPLITUDE * (sin((ome_1 + M_PI)) + sin(ome_2)) + OFFSET));
+    }
+}
\ No newline at end of file

diff -r 000000000000 -r 66d8d7360022 sinc.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sinc.h	Tue Jun 26 06:27:08 2018 +0000
@@ -0,0 +1,26 @@
+/*
+* うなりを生成する
+*/
+
+#ifndef SINC_H
+#define SINC_H
+
+#include <math.h>
+#include <stdint.h>
+
+#define BUFFER_SIZE   2000
+#define AMPLITUDE     0.75  // 3.3V * amplitude
+#define OFFSET        1.6
+
+class sinc {
+private:
+    void generate();
+public:
+    uint16_t buffer[BUFFER_SIZE];
+    
+    sinc();
+    
+    void init();
+    };
+
+#endif
\ No newline at end of file