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diff --git a/src/org/cyanogenmod/audiofx/widget/Complex.java b/src/org/cyanogenmod/audiofx/widget/Complex.java
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+/*
+ * Copyright (C) 2016 The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.cyanogenmod.audiofx.widget;
+
+/**
+ * Java support for complex numbers.
+ *
+ * @author alankila
+ */
+public class Complex {
+    private final double mReal, mIm;
+
+    public Complex(double real, double im) {
+        mReal = real;
+        mIm = im;
+    }
+
+    /**
+     * Length of complex number
+     *
+     * @return length
+     */
+    public double rho() {
+        return Math.sqrt(mReal * mReal + mIm * mIm);
+    }
+
+    /**
+     * Argument of complex number
+     *
+     * @return angle in radians
+     */
+    public double theta() {
+        return Math.atan2(mIm, mReal);
+    }
+
+    /**
+     * Complex conjugate
+     *
+     * @return conjugate
+     */
+    public Complex con() {
+        return new Complex(mReal, -mIm);
+    }
+
+    /**
+     * Complex addition
+     *
+     * @param other
+     * @return sum
+     */
+    public Complex add(Complex other) {
+        return new Complex(mReal + other.mReal, mIm + other.mIm);
+    }
+
+    /**
+     * Complex multipply
+     *
+     * @param other
+     * @return multiplication result
+     */
+    public Complex mul(Complex other) {
+        return new Complex(mReal * other.mReal - mIm * other.mIm,
+                mReal * other.mIm + mIm * other.mReal);
+    }
+
+    /**
+     * Complex multiply with real value
+     *
+     * @param a
+     * @return multiplication result
+     */
+    public Complex mul(double a) {
+        return new Complex(mReal * a, mIm * a);
+    }
+
+    /**
+     * Complex division
+     *
+     * @param other
+     * @return division result
+     */
+    public Complex div(Complex other) {
+        double lengthSquared = other.mReal * other.mReal + other.mIm * other.mIm;
+        return mul(other.con()).div(lengthSquared);
+    }
+
+    /**
+     * Complex division with real value
+     *
+     * @param a
+     * @return division result
+     */
+    public Complex div(double a) {
+        return new Complex(mReal / a, mIm / a);
+    }
+}