added complex convolution

app/src/main/java/xdsopl/robot36/ComplexConvolution.java

@@ -0,0 +1,41 @@
+/*
+Complex Convolution
+
+Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
+*/
+
+package xdsopl.robot36;
+
+public class ComplexConvolution {
+	public final int length;
+	public final float[] taps;
+	private final float[] real;
+	private final float[] imag;
+	private final Complex sum;
+	private int pos;
+
+	ComplexConvolution(int length) {
+		this.length = length;
+		this.taps = new float[length];
+		this.real = new float[length];
+		this.imag = new float[length];
+		this.sum = new Complex();
+		this.pos = 0;
+	}
+
+	Complex push(Complex input) {
+		real[pos] = input.real;
+		imag[pos] = input.imag;
+		if (++pos >= length)
+			pos = 0;
+		sum.real = 0;
+		sum.imag = 0;
+		for (float tap : taps) {
+			sum.real += tap * real[pos];
+			sum.imag += tap * imag[pos];
+			if (++pos >= length)
+				pos = 0;
+		}
+		return sum;
+	}
+}