android getting sound frequencies real time?

Question

I have been trying to get the sound frequency(number) in real time using fft and i am having run time errors. can any one help?

package com.example.recordsou         


        

Answer 1

Did you solved the problem? The crush is occurred because of the ArrayIndexOutOfBoundsException.

So, modify your code to :

                double[] re = new double[blockSize];
                double[] im = new double[blockSize];
                double[] magnitude = new double[blockSize];

                // Calculate the Real and imaginary and Magnitude.
                for(int i = 0; i < blockSize+1; i++){
                    try {
                        // real is stored in first part of array
                        re[i] = toTransform[i * 2];
                        // imaginary is stored in the sequential part
                        im[i] = toTransform[(i * 2) + 1];
                        // magnitude is calculated by the square root of (imaginary^2 + real^2)
                        magnitude[i] = Math.sqrt((re[i] * re[i]) + (im[i] * im[i]));
                    }catch (ArrayIndexOutOfBoundsException e){
                        Log.e("test", "NULL");
                    }
                }

                double peak = -1.0;
                // Get the largest magnitude peak
                for(int i = 0; i < blockSize; i++){
                    if(peak < magnitude[i])
                        peak = magnitude[i];
                }
                // calculated the frequency
                frequency = Double.toString((sampleRate * peak)/blockSize);