Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

public class Main {
    public static double goertzel(double[] data, double freq, double sr) {
        double s_prev = 0;
        double s_prev2 = 0;
        double coeff = 2 * Math.cos((2 * Math.PI * freq) / sr);
        double s;
        for (int i = 0; i < data.length; i++) {
            double sample = data[i];
            s = sample + coeff * s_prev - s_prev2;
            s_prev2 = s_prev;
            s_prev = s;
        }
        double power = s_prev2 * s_prev2 + s_prev * s_prev - coeff * s_prev2 * s_prev;

        return power;
    }
}