Embedded 1.0.0

Fast Fourier Transform Node

The Fast Fourier Transform Node allows for transforming an array of data points from one domain (such as space or time) into a frequency representation using a fast Fourier transform algorithm.

Fast Fourier Transform Node

Configuration

The Fast Fourier Transform Node takes two properties for its configuration.

Source Path

First, enter a payload path to an array of numbers on which to run the transformation. Each item in the array must be a real number, or the operation will fail.

Ideally, the length of the array should be a power of 2 — as in, the transformation should be applied to 2, 4, 8, 16, 32, 64, 128, etc. numbers. If the array length is not a power of 2, the node will add 0 values to the array until the next power of 2 length is reached.

Note: The maximum length of the input array is 2,048 items. Attempting to transform an array of more items will cause the node to error.

Result Path

Next, enter a payload path where the result of the transformation should be placed. The result will be an object containing the following properties:

  • result: An array containing the calculated frequency domains.
  • sampleCount: The length of the provided array of numbers.
  • paddingCount: The amount of zeroes added to a non-power-of-two input array length.

Node Errors

There are a handful of common cases where the Fast Fourier Transform Node will throw an error:

  • If the value at the source path is not an array.
  • If the value is an array but the array is empty.
  • If any item within the source array is not a number.
  • If the length of the source array is greater than 2,048 items.

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