Example usage for com.badlogic.gdx.audio.analysis FFT forward

Introduction

In this page you can find the example usage for com.badlogic.gdx.audio.analysis FFT forward.

Prototype

public void forward(float[] buffer) 

Source Link

Usage

From source file:com.kvw.oscdroid.channels.AnalogChannel.java

License:Open Source License

/**
 * Perform FFT, determine largest frequency component and set as frequency
 *///from   w ww  . j av a 2 s.c  o  m
private void calcFreq() {
    float fIndex = -1;
    float maxMag = -1;
    float[] mags;

    float[] fft_array = new float[NUM_SAMPLES];

    FFT fft = new FFT(NUM_SAMPLES, mSampleRates[chTimeDiv]);

    for (int i = 0; i < NUM_SAMPLES; i++)
        fft_array[i] = (float) mDataSet[i];

    fft.forward(fft_array);
    mags = fft.getSpectrum();

    for (int i = 1; i < mags.length; i++) {
        if (mags[i] > maxMag) {
            maxMag = mags[i];
            fIndex = i;
        }
    }

    //Somehow the calculated frequency differs a factor 2. Compensate by dividing by 2
    chFrequency = (float) mSampleRates[chTimeDiv] * fIndex / mags.length / 2;

    //      Log.d(TAG,"Mag: " + maxMag + " Index: " + fIndex + " Freq: " + chFrequency + " SR: " + mSampleRates[chTimeDiv]);

    fft = null;
    fft_array = null;
    mags = null;
}

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