Computes the Discrete Cosine Transform (DCT) of a sequence.
A real vector.
This input can be a 1D or 2D array of double-precision, floating-point numbers.
The length of the DCT you want to perform.
If DCT size is greater than the number of elements in x, this node adds zeros to the end of x to match the size of DCT size. If DCT size is less than the number of elements in x, this node uses only the leading DCT size elements in x to perform the DCT. If DCT size is less than or equal to zero, this node uses the length of x as the DCT size.
This input is available only if you wire a 1D array of double-precision, floating-point numbers to x.
Error conditions that occur before this node runs.
The node responds to this input according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Default: No error
The DCT of the input sequence.
Error information.
The node produces this output according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
The one-dimensional Discrete Cosine Transform DCT{x} of a 1D array x is defined by the following equations:
and
where
This node applies a fast DCT algorithm instead of calculating the Discrete Cosine Transform directly. This node implements the fast DCT algorithm using an FFT-based technique.
The two-dimensional Discrete Cosine Transform DCT{x} of a 2D array x is defined by the following equation:
where
This node performs a two-dimensional DCT using the following two steps:
Where This Node Can Run:
Desktop OS: Windows
FPGA: Not supported
Web Server: Not supported in VIs that run in a web application