FFT2D
Advanced Analysis Library Only
AnalysisLibErrType FFT2D (void *timeDomainSignal, ssize_t numberOfRows, ssize_t numberOfColumns, ssize_t numberOfRowsForFFT, ssize_t numberOfColumnsForFFT, int shift, void *fft);
Purpose
Computes the Fast Fourier Transform (FFT) of a 2D time-domain signal.
Parameters
| Input | ||
| Name | Type | Description |
| timeDomainSignal | void * | The real time-domain signal. |
| numberOfRows | ssize_t | The number of rows in timeDomainSignal. |
| numberOfColumns | ssize_t | The number of columns in timeDomainSignal. |
| numberOfRowsForFFT | ssize_t | The number of rows on which to perform the FFT. If numberOfRowsForFFT does not equal numberOfRows, this function truncates timeDomainSignal or pads timeDomainSignal with zeros to create a numberOfRowsForFFT by numberOfColumnsForFFT matrix for which it calculates the FFT. If numberOfRowsForFFT is less than 1, this function uses numberOfRows for this parameter. |
| numberOfColumnsForFFT | ssize_t | The number of columns on which to perform the FFT. If numberOfColumnsForFFT does not equal numberOfColumns, this function truncates timeDomainSignal or pads timeDomainSignal with zeros to create a numberOfRowsForFFT by numberOfColumnsForFFT matrix for which it calculates the FFT. If numberOfColumnsForFFT is less than 1, this function uses numberOfColumns for this parameter. |
| shift | int | Specifies whether to shift the DC component to the center of the FFT result. shift must be one of the following values:
|
| Output | ||
| Name | Type | Description |
| FFT | void * | The FFT of the time-domain signal. |
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