Initial commit — WPF guitar note name tutor using FFT frequency detection

2026-05-09 03:17:07 +00:00
commit 99b73f710a
30 changed files with 1637 additions and 0 deletions
@@ -0,0 +1,72 @@
+using System;
+
+namespace SoundAnalysis
+{
+    /// <summary>
+    /// Complex number.
+    /// </summary>
+    struct ComplexNumber
+    {
+        public double Re;
+        public double Im;
+
+        public ComplexNumber(double re)
+        {
+            Re = re;
+            Im = 0;
+        }
+
+        public ComplexNumber(double re, double im)
+        {
+            Re = re;
+            Im = im;
+        }
+
+        public static ComplexNumber operator *(ComplexNumber n1, ComplexNumber n2)
+        {
+            return new ComplexNumber(n1.Re * n2.Re - n1.Im * n2.Im,
+                n1.Im * n2.Re + n1.Re * n2.Im);
+        }
+
+        public static ComplexNumber operator +(ComplexNumber n1, ComplexNumber n2)
+        {
+            return new ComplexNumber(n1.Re + n2.Re, n1.Im + n2.Im);
+        }
+
+        public static ComplexNumber operator -(ComplexNumber n1, ComplexNumber n2)
+        {
+            return new ComplexNumber(n1.Re - n2.Re, n1.Im - n2.Im);
+        }
+
+        public static ComplexNumber operator -(ComplexNumber n)
+        {
+            return new ComplexNumber(-n.Re, -n.Im);
+        }
+
+        public static implicit operator ComplexNumber(double n)
+        {
+            return new ComplexNumber(n, 0);
+        }
+
+        public ComplexNumber PoweredE()
+        {
+            double e = Math.Exp(Re);
+            return new ComplexNumber(e * Math.Cos(Im), e * Math.Sin(Im));
+        }
+
+        public double Power2()
+        {
+            return Re * Re - Im * Im;
+        }
+
+        public double AbsPower2()
+        {
+            return Re * Re + Im * Im;
+        }
+
+        public override string ToString()
+        {
+            return String.Format("{0}+i*{1}", Re, Im);
+        }
+    }
+}