DCT
Advanced Analysis Library Only
AnalysisLibErrType DCT (double inputArray[], ssize_t numberOfElements, ssize_t numberOfElementsInDCT, double outputArray[]);
Purpose
Computes the one-dimensional Discrete Cosine Transform (DCT) of the input sequence inputArray, which is defined as follows:
and
| where | numberOfElements is the length of inputArray |
 is the n-th element of inputArray | |
 is the k-th element of outputArray |
Parameters
| Input | ||
| Name | Type | Description |
| inputArray | double [] | The input sequence. |
| numberOfElements | ssize_t | The number of elements in inputArray. |
| numberOfElementsInDCT | ssize_t | The length of the DCT to be performed. If numberOfElementsInDCT is greater than numberOfElements, the function pads inputArray with zeros to make numberOfElements equal numberOfElementsInDCT. If numberOfElementsInDCT is less than numberOfElements, inputArray is truncated. Only the leading numberOfElementsInDCT elements in inputArray are used to perform the DCT. If numberOfElementsInDCT is less than or equal to zero, the function uses numberOfElements as numberOfElementsInDCT. |
| Output | ||
| Name | Type | Description |
| outputArray | double [] | The DCT of inputArray. |
Return Value
| Name | Type | Description |
| status | AnalysisLibErrType | A value that specifies the type of error that occurred. Refer to analysis.h for definitions of these constants. |
Additional Information
Library: Advanced Analysis Library
Include file: analysis.h
LabWindows/CVI compatibility: LabWindows/CVI 8.0 and later