计算两个麦克风的音频输入的互相关的有效方法

Question

我试图计算unity3d中两个麦克风输入信号之间的互相关，然后对该相关值进行FFT。问题是，它正确计算相关性，但它使游戏滞后很多。 难道我做错了什么？我应该不在update（）中这样做吗？ 我需要获得实时相关值。

public class MicInput : MonoBehaviour {
AudioSource aud1, aud2;
int signalLength = 3200;
public float[] _samples1 = new float[3200];
public float[] _samples2 = new float[3200];
public double[] _newSamples1 = new double[3200];
//public double[] _newSamples2 = new double[512];

public float[] cc2 = new float[9];

public double[] dft = new double[5];


// Use this for initialization
void Start ()
{

    aud1 = GetComponent<AudioSource>();
    aud1.clip = Microphone.Start(Microphone.devices[3], true, 10, 16000);
    aud1.loop = true;
    aud1.mute = false;

    aud2 = GetComponent<AudioSource>();
    aud2.clip = Microphone.Start(Microphone.devices[4], true, 10, 16000);
    aud2.loop = true;
    aud2.mute = false;


}

// Update is called once per frame
void Update () {
    aud1.clip.GetData(_samples1, 0);
    aud2.clip.GetData(_samples2, 0);
    cc2 = MyCrossCorr(_samples1, _samples2);
}

float[] MyCrossCorr(float[] arr1, float[] arr2)
{
    int lx = arr1.Length;
    int ly = arr2.Length;
    int jmin, jmax, index;
    index = 0;
    int lconv = lx + ly - 1;
    float[] z = new float[lconv];
    for (int i = 0; i < lconv; i++)
    {
        if (i >= ly)
        {
            jmin = i - ly + 1;
        }
        else
        {
            jmin = 0;
        }

        if (i < lx)
        {
            jmax = i;
        }
        else
        {
            jmax = lx -1;
        }

        for (int j = jmin; j <= jmax; j++)
        {
            index = ly - i + j - 1;
            z[i] = z[i] + (arr1[j] * arr2[index]);

        }
    }
    //Debug.Log(z);
    return z;
 }
}