java - 在旧 C 中，这是什么意思？双(*窗口)(双)

Question

我正在尝试将一些用 C 编写的旧 DSP 代码转换为 Java，然后再转换为 C#。我不明白参数“double (*Window)(double)”的含义以及如何在 Java 代码中引用它。以下功能让我不确定该怎么做。

void WinFirI(float LowOmega, float UppOmega,
       float *Shape, int Len, double (*Window)(double), float shift)
{ int i; double time,phase,shape;
// printf("WinFirI: %5.3f %5.3f %d\n",LowOmega,UppOmega,Len);
  for(i=0; i<Len; i++)
  { time=i+(1.0-shift)-(float)Len/2; phase=2*M_PI*time/Len;
    if(time==0) shape=UppOmega-LowOmega;
       else shape=(sin(UppOmega*time)-sin(LowOmega*time))/time;
// printf("%2d %5.1f %5.2f %7.4f %7.4f\n",i,time,phase,shape,(*Window)     (phase));
    Shape[i]=shape*(*Window)(phase)/M_PI; }
}

到目前为止我已经写了这个:

public void WinFirI(float LowOmega, float UppOmega,
       float[] Shape, int Len, double[] Window, float shift) {
        double time;
        double phase;
        double shape;
//      printf("WinFirI: %5.3f %5.3f %d\n",LowOmega,UppOmega,Len);
        for(int i=0; i<Len; i++) {
            time = i +(1.0-shift) - (float)Len/2;
            phase = 2 * Math.PI * time / Len;
            if(time==0) {
                shape = UppOmega - LowOmega;
            }
       else {
                shape=(Math.sin(UppOmega*time) - Math.sin(LowOmega*time))    / time;
            }
//          printf("%2d %5.1f %5.2f %7.4f %7.4f\n",i,time,phase,shape,    (*Window)(phase));
            //Shape[i]=shape*(*Window)(phase)/M_PI; 
            Shape[i] = shape * Window[phase]/Math.PI;
        }
    }

Answer 1

指向参数为 double 并返回 double 的函数的指针。