MicrophoneInput.GetFundamentalFrequency C# (CSharp) Method

    float GetFundamentalFrequency()
    {
        float fundamentalFrequency = 0.0f;
        float[] data = new float[8192];
        audio_source.GetSpectrumData(data, 0, FFTWindow.BlackmanHarris);
        float s = 0.0f;
        int i = 0;
        for (int j = 1; j < 4096; j++)
        {
            if (s < data[j])
            {
                s = data[j];
                i = j;
            }
        }
        fundamentalFrequency = i * samplerate / 8192;
        return fundamentalFrequency;
    }