convcirc (MathScript RT Module Function)
Owning Class: filter implementation
Requires: MathScript RT Module
Syntax
x = convcirc(a, b)
x = convcirc(a, b, n)
Legacy Name: cconv
Description
Computes the circular convolution of two input vectors.
Inputs
| Name | Description |
|---|---|
| a | Specifies a real or complex input vector. If length(a) is greater than n, LabVIEW wraps a. If length(a) is less than n, LabVIEW pads the end of a with zeros. |
| b | Specifies a real or complex input vector. If length(b) is greater than n, LabVIEW wraps b. If length(b) is less than n, LabVIEW pads the end of b with zeros. |
| n | Specifies the size of the circular convolution. The default is length(a) + length(b) - 1. |
Outputs
| Name | Description |
|---|---|
| x | Returns the circular convolution of a and b. |
Details
LabVIEW computes the circular convolution using the same algorithm as the default method in the Convolution VI. However, you can use the convcirc function to set the size of the convolution whereas the Convolution VI always returns the result with a length of length(a) + length(b) - 1.
Examples
a1 = 0.1:0.1:0.4;
b1 = mirrorh(a1);
x1 = convcirc(a1,b1);
a2=[1-j, 2+2j, 3-3j, 4+4j];
b2=[5+0.5j, 4-0.4j, 3+3j, 2, 1];
x2 = convcirc(a2, b2, 4);